cyclophosphamide (Rx)

Malignant Diseases

IV (intermittent therapy): 40-50 mg/kg (400-1800 mg/m²) divided over 2-5 days; may be repeated at intervals of 2-4 weeks  

IV (continuous daily therapy): 60-120 mg/m²/day (1-2.5 mg/kg/day)

PO (intermittent therapy): 400-1000 mg/m² divided over 4-5 days

PO (continuous daily therapy): 50-100 mg/m²/day or 1-5 mg/kg/day

Nephrotic Syndrome

2-3 mg/kg/day for up to 12 weeks when corticosteroids unsuccessful  

Non-Hodgkin Lymphoma

600-1500 mg/m² IV with other antineoplastics (part of CHOP regimen); dose intensification possible  

Breast Cancer

600 mg/m² IV with other antineoplastics; dose intensification possible  

Juvenile Idiopathic Arthritis/Vasculitis (Off-label)

10 mg/kg IV every 2 weeks  

Lupus Nephritis (Off-Label)

Induction therapy for lupus nephritis (American College of Rheumatology Guidelines 2012)

Low-dose: 500 mg IV every 2 weeks for 6 doses plus corticosteroids, then maintenance with mycophenolate mofetil or azathioprine

High-dose: 500-1000 mg/m² IV monthly for 6 doses plus corticosteroids

Systemic Sclerosis (Orphan)

Prevention of graft-versus-host disease after allogeneic hematopoietic stem cell transplant

Orphan designation sponsor

• Accentia Biopharmaceuticals, 324 South Hyde Avenue, Suite 350, Tampa, FL 33606

Dosing Modifications

Hepatic impariment: Give 75% of normal dose if transaminase levels are >3 times upper limit of normal or bilirubin is 3.1-5 mg/dL

Renal impairment: CrCl <10 mL/min, give 75% of normal dose; CrCl >10 mL/min, give full dose

Malignant Diseases

IV (intermittent therapy): 40-50 mg/kg (400-1800 mg/m²) divided over 2-5 days; may be repeated at intervals of 2-4 weeks  

IV (continuous daily therapy): 60-120 mg/m²/day (1-2.5 mg/kg/day)

PO (intermittent therapy): 400-1000 mg/m² divided over 4-5 days

PO (continuous daily therapy): 50-100 mg/m²/day

Juvenile Idiopathic Arthritis/Vasculitis

10 mg/kg IV every 2 weeks  

Nephrotic Syndrome

2-3 mg/kg/day for up to 12 weeks when corticosteroids unsuccessful  

Systemic Lupus Erythematosus

500-750 mg/m² IV monthly; not to exceed 1 g/m²  

Contraindicated (0)

Serious - Use Alternative (23)

• abametapir

  abametapir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP3A4 substrates. If not feasible, avoid use of abametapir.
  
  abametapir will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP2B6 substrates. If not feasible, avoid use of abametapir.

• adenovirus types 4 and 7 live, oral

  cyclophosphamide decreases effects of adenovirus types 4 and 7 live, oral by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressives may diminish therapeutic effects of vaccines and increase risk of adverse effects (increased risk of infection). Live-attenuated vaccines should be avoided for at least 3mo after cessation of immunosuppressive therapy.

• apalutamide

  apalutamide will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of apalutamide, a strong CYP3A4 inducer, with drugs that are CYP3A4 substrates can result in lower exposure to these medications. Avoid or substitute another drug for these medications when possible. Evaluate for loss of therapeutic effect if medication must be coadministered. Adjust dose according to prescribing information if needed.

• axicabtagene ciloleucel

  cyclophosphamide, axicabtagene ciloleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• brexucabtagene autoleucel

  cyclophosphamide, brexucabtagene autoleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• ciltacabtagene autoleucel

  cyclophosphamide, ciltacabtagene autoleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• deferiprone

  deferiprone, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid use of deferiprone with other drugs known to be associated with neutropenia or agranulocytosis; if an alternative is not possible, monitor absolute neutrophil count more frequently.

• etanercept

  etanercept, cyclophosphamide. Mechanism: unspecified interaction mechanism. Avoid or Use Alternate Drug. The incidence of noncutaneous solid malignancies may be increased in patients receiving TNF blocking agents with cyclophosphamide. Coadministration is not recommended.

• fexinidazole

  fexinidazole will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Avoid or Use Alternate Drug. Coadministration may decrease plasma concentrations of CYP2B6 substrates owing to fexinidazole inducing CYP2B6.
  
  fexinidazole will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Fexinidazole inhibits CYP3A4. Coadministration may increase risk for adverse effects of CYP3A4 substrates.

• hydrochlorothiazide

  hydrochlorothiazide increases toxicity of cyclophosphamide by decreasing renal clearance. Avoid or Use Alternate Drug. Increased myelosuppressive effects.

• idarubicin

  cyclophosphamide increases toxicity of idarubicin by Other (see comment). Avoid or Use Alternate Drug. Comment: May increase formation of toxic anthracycline metabolites in heart tissue.

• idecabtagene vicleucel

  cyclophosphamide, idecabtagene vicleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• idelalisib

  idelalisib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Idelalisib is a strong CYP3A inhibitor; avoid coadministration with sensitive CYP3A substrates

• influenza virus vaccine quadrivalent, adjuvanted

  cyclophosphamide decreases effects of influenza virus vaccine quadrivalent, adjuvanted by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressive drugs may reduce the immune response to influenza vaccine.

• influenza virus vaccine trivalent, adjuvanted

  cyclophosphamide decreases effects of influenza virus vaccine trivalent, adjuvanted by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressive drugs may reduce the immune response to influenza vaccine.

• lisocabtagene maraleucel

  cyclophosphamide, lisocabtagene maraleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• lonafarnib

  lonafarnib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration with sensitive CYP3A substrates. If coadministration unavoidable, monitor for adverse reactions and reduce CYP3A substrate dose in accordance with product labeling.

• palifermin

  palifermin increases toxicity of cyclophosphamide by Other (see comment). Avoid or Use Alternate Drug. Comment: Palifermin should not be administered within 24 hrbefore, during infusion of, or within 24 hr after administration of antineoplastic agents. Coadministration of palifermin within 24 hr of chemotherapy resulted in increased severity and duration of oral mucositis.

• ropeginterferon alfa 2b

  ropeginterferon alfa 2b, cyclophosphamide. Either increases toxicity of the other by Other (see comment). Avoid or Use Alternate Drug. Comment: Myelosuppressive agents can produce additive myelosuppression. Avoid use and monitor patients receiving the combination for effects of excessive myelosuppression.

• tisagenlecleucel

  cyclophosphamide, tisagenlecleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• tofacitinib

  cyclophosphamide, tofacitinib. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• tucatinib

  tucatinib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid concomitant use of tucatinib with CYP3A substrates, where minimal concentration changes may lead to serious or life-threatening toxicities. If unavoidable, reduce CYP3A substrate dose according to product labeling.

• voxelotor

  voxelotor will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor increases systemic exposure of sensitive CYP3A4 substrates. Avoid coadministration with sensitive CYP3A4 substrates with a narrow therapeutic index. Consider dose reduction of the sensitive CYP3A4 substrate(s) if unable to avoid.

Monitor Closely (87)

• acalabrutinib

  acalabrutinib, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration may increase risk of myelosuppressive effects.

• allopurinol

  allopurinol increases toxicity of cyclophosphamide by decreasing metabolism. Use Caution/Monitor.

• amiodarone

  amiodarone increases toxicity of cyclophosphamide by unspecified interaction mechanism. Use Caution/Monitor.

• antithrombin III

  cyclophosphamide increases effects of antithrombin III by unknown mechanism. Use Caution/Monitor.

• argatroban

  cyclophosphamide increases effects of argatroban by unknown mechanism. Use Caution/Monitor. Additive risk of bleeding may be seen in thrombocytopenic patients receiving antineoplastic agents in combination with argatroban because these agents can decrease platelet counts.

• atazanavir

  atazanavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  atazanavir increases toxicity of cyclophosphamide by unspecified interaction mechanism. Use Caution/Monitor.

• belatacept

  belatacept and cyclophosphamide both increase immunosuppressive effects; risk of infection. Use Caution/Monitor.

• belzutifan

  belzutifan will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If unable to avoid coadministration of belzutifan with sensitive CYP3A4 substrates, consider increasing the sensitive CYP3A4 substrate dose in accordance with its prescribing information.

• bendamustine

  bendamustine, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• bivalirudin

  cyclophosphamide increases effects of bivalirudin by unknown mechanism. Use Caution/Monitor. Additive risk of bleeding may be seen in thrombocytopenic patients receiving antineoplastic agents in combination with anticoagulants such as bivalirudin.

• bupivacaine implant

  cyclophosphamide, bupivacaine implant. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: Local anesthetics may increase the risk of developing methemoglobinemia when concurrently exposed to drugs that also cause methemoglobinemia.

• busulfan

  cyclophosphamide, busulfan. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor.
  
  busulfan, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• butabarbital

  butabarbital will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• cannabidiol

  cannabidiol, cyclophosphamide. affecting hepatic enzyme CYP2B6 metabolism. Modify Therapy/Monitor Closely. Owing to the potential for both CYP2B6 induction and inhibition with the coadministration of CYP2B6 substrates and cannabidiol, consider reducing dosage adjustment of CYP2B6 substrates as clinically appropriate.

• carbamazepine

  carbamazepine will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• carboplatin

  carboplatin, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• carmustine

  carmustine, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• cenobamate

  cenobamate will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP2B6 substrate, as needed, when coadministered with cenobamate.
  
  cenobamate will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP3A4 substrate, as needed, when coadministered with cenobamate.

• chlorambucil

  chlorambucil, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• cholera vaccine

  cyclophosphamide decreases effects of cholera vaccine by immunosuppressive effects; risk of infection. Modify Therapy/Monitor Closely. Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs and corticosteroids (used in greater than physiologic doses), may reduce the immune response to cholera vaccine.

• cisplatin

  cisplatin, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• crizotinib

  cyclophosphamide will increase the level or effect of crizotinib by aldehyde dehydrogenase inhibition. Use Caution/Monitor.

• crofelemer

  crofelemer increases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Crofelemer has the potential to inhibit CYP3A4 at concentrations expected in the gut; unlikely to inhibit systemically because minimally absorbed.

• dabrafenib

  dabrafenib will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.

• dacarbazine

  cyclophosphamide, dacarbazine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• dalteparin

  cyclophosphamide increases effects of dalteparin by unknown mechanism. Use Caution/Monitor. Due to potential thrombocytopenic effects of cyclophosphamide, an additive risk of bleeding may be seen in patients receiving concomitant anticoagulants.

• darunavir

  darunavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dengue vaccine

  cyclophosphamide decreases effects of dengue vaccine by immunosuppressive effects; risk of infection. Use Caution/Monitor. Immunosuppressive therapies (eg, irradiation, antimetabolites, alkylating agents, cytotoxic drugs, corticosteroids [greater than physiologic doses]) may reduce immune response to dengue vaccine.

• denosumab

  cyclophosphamide, denosumab. Other (see comment). Use Caution/Monitor. Comment: Caution should be taken in patients on concomitant immunosuppressants or with impaired immune systems because of increased risk for serious infections.

• digoxin

  cyclophosphamide decreases levels of digoxin by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.

• doxorubicin

  doxorubicin increases toxicity of cyclophosphamide by unspecified interaction mechanism. Use Caution/Monitor. Increased risk of hemorrhagic cystitis.

• doxorubicin liposomal

  doxorubicin liposomal increases toxicity of cyclophosphamide by unspecified interaction mechanism. Use Caution/Monitor. Increased risk of hemorrhagic cystitis.

• efavirenz

  efavirenz will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• elagolix

  elagolix will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Elagolix is a weak-to-moderate CYP3A4 inducer. Monitor CYP3A substrates if coadministered. Consider increasing CYP3A substrate dose if needed.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  elvitegravir/cobicistat/emtricitabine/tenofovir DF increases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Cobicistat is a CYP3A4 inhibitor; contraindicated with CYP3A4 substrates for which elevated plasma concentrations are associated with serious and/or life-threatening events.

• enoxaparin

  cyclophosphamide increases effects of enoxaparin by unknown mechanism. Use Caution/Monitor. Due to potential thrombocytopenic effects of cyclophosphamide, an additive risk of bleeding may be seen in patients receiving concomitant anticoagulants.

• fedratinib

  fedratinib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.

• fingolimod

  cyclophosphamide increases effects of fingolimod by immunosuppressive effects; risk of infection. Modify Therapy/Monitor Closely. Concomitant therapy is expected to increase the risk of immunosuppression. Use caution when switching patients from long-acting therapies with immune effects. .

• fluvoxamine

  fluvoxamine will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• fondaparinux

  cyclophosphamide increases effects of fondaparinux by unknown mechanism. Use Caution/Monitor. Due to potential thrombocytopenic effects of cyclophosphamide, an additive risk of bleeding may be seen in patients receiving concomitant anticoagulants.

• heparin

  cyclophosphamide increases effects of heparin by unknown mechanism. Use Caution/Monitor. Due to potential thrombocytopenic effects of cyclophosphamide, an additive risk of bleeding may be seen in patients receiving concomitant anticoagulants.

• hydroxyurea

  cyclophosphamide, hydroxyurea. Other (see comment). Use Caution/Monitor. Comment: Combination may increase risk of myelosuppression.

• ifosfamide

  cyclophosphamide, ifosfamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.
  
  ifosfamide, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration with ifosfamide may increase the risk of immunosuppression and myelosuppression.

• iloperidone

  iloperidone increases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Iloperidone is a time-dependent CYP3A inhibitor and may lead to increased plasma levels of drugs predominantly eliminated by CYP3A4.

• indinavir

  indinavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• influenza A (H5N1) vaccine

  cyclophosphamide decreases effects of influenza A (H5N1) vaccine by pharmacodynamic antagonism. Use Caution/Monitor. Immunosuppressive therapies may reduce immune response to H5N1 vaccine.

• influenza virus vaccine (H5N1), adjuvanted

  cyclophosphamide decreases effects of influenza virus vaccine (H5N1), adjuvanted by pharmacodynamic antagonism. Use Caution/Monitor. Immunosuppressive therapies may reduce immune response to H5N1 vaccine.

• isavuconazonium sulfate

  cyclophosphamide and isavuconazonium sulfate both decrease immunosuppressive effects; risk of infection. Use Caution/Monitor.

• istradefylline

  istradefylline will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of CYP3A4 substrates in clinical trials. This effect was not observed with istradefylline 20 mg/day. Consider dose reduction of sensitive CYP3A4 substrates.

• ketoconazole

  ketoconazole increases toxicity of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lemborexant

  lemborexant will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Modify Therapy/Monitor Closely. Monitor CYP2B6 substrate for adequate clinical response. Consider increasing the CYP2B6 substrate dose according to specific prescribing recommendations.

• lenacapavir

  lenacapavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lencapavir (a moderate CYP3A4 inhibitor) may increase CYP3A4 substrates initiated within 9 months after last SC dose of lenacapavir, which may increase potential risk of adverse reactions of CYP3A4 substrates.

• letermovir

  letermovir increases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lomustine

  cyclophosphamide, lomustine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.
  
  lomustine, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration with lomustine may increase the risk of immunosuppression and myelosuppression.

• lopinavir

  lopinavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lumacaftor/ivacaftor

  lumacaftor/ivacaftor, cyclophosphamide. affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor. In vitro studies suggest that lumacaftor may induce and ivacaftor may inhibit CYP2B6 substrates. .

• mechlorethamine

  cyclophosphamide, mechlorethamine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration with mechlorethamine may increase the risk of immunosuppression and myelosuppression.
  
  mechlorethamine, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration with mechlorethamine may increase the risk of immunosuppression and myelosuppression.

• meningococcal group B vaccine

  cyclophosphamide decreases effects of meningococcal group B vaccine by pharmacodynamic antagonism. Use Caution/Monitor. Individuals with altered immunocompetence may have reduced immune responses to the vaccine.

• mifepristone

  mifepristone will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mitotane

  mitotane decreases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Mitotane is a strong inducer of cytochrome P-4503A4; monitor when coadministered with CYP3A4 substrates for possible dosage adjustments.

• nelfinavir

  nelfinavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ocrelizumab

  cyclophosphamide and ocrelizumab both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Coadministration of ocrelizumab with immunosuppressants may increase the risk of immunosuppression.

• ofatumumab SC

  ofatumumab SC, cyclophosphamide. Either increases effects of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Consider the risk of additive immune system effects when coadministering immunosuppressive therapies with coadministration. When switching from therapies with immune effects, take into account the duration and mechanism of action of these therapies when initiating ofatumumab SC.

• olaparib

  cyclophosphamide and olaparib both increase pharmacodynamic synergism. Use Caution/Monitor. Coadministration with other other myelosuppressive anticancer agents, including DNA damaging agents, may potentiate and prolongate the myelosuppressive toxicity.

• pentobarbital

  pentobarbital will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• phenobarbital

  phenobarbital will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• primidone

  primidone will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• rifampin

  rifampin will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.
  
  rifampin will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ritonavir

  ritonavir will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.
  
  ritonavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rucaparib

  rucaparib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

• saquinavir

  saquinavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• secobarbital

  secobarbital will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• siponimod

  siponimod and cyclophosphamide both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Caution if coadministered because of additive immunosuppressive effects during such therapy and in the weeks following administration. When switching from drugs with prolonged immune effects, consider the half-life and mode of action of these drugs to avoid unintended additive immunosuppressive effects.

• sipuleucel-T

  cyclophosphamide decreases effects of sipuleucel-T by pharmacodynamic antagonism. Modify Therapy/Monitor Closely.

• sodium sulfate/?magnesium sulfate/potassium chloride

  sodium sulfate/?magnesium sulfate/potassium chloride increases toxicity of cyclophosphamide by Other (see comment). Use Caution/Monitor. Comment: Coadministration with medications that cause fluid and electrolyte abnormalities may increase the risk of adverse events of seizure, arrhythmias, and renal impairment.

• sodium sulfate/potassium sulfate/magnesium sulfate

  sodium sulfate/potassium sulfate/magnesium sulfate increases toxicity of cyclophosphamide by Other (see comment). Use Caution/Monitor. Comment: Coadministration with medications that cause fluid and electrolyte abnormalities may increase the risk of adverse events of seizure, arrhythmias, and renal impairment.

• sorafenib

  sorafenib will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• stiripentol

  stiripentol, cyclophosphamide. affecting hepatic enzyme CYP2B6 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP2B6 inhibitor and inducer. Monitor CYP2B6 substrates coadministered with stiripentol for increased or decreased effects. CYP2B6 substrates may require dosage adjustment.
  
  stiripentol, cyclophosphamide. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP3A4 inhibitor and inducer. Monitor CYP3A4 substrates coadministered with stiripentol for increased or decreased effects. CYP3A4 substrates may require dosage adjustment.

• streptozocin

  cyclophosphamide, streptozocin. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• succinylcholine

  cyclophosphamide increases levels of succinylcholine by decreasing metabolism. Use Caution/Monitor. Neuromuscular blockade may be prolonged because of inhibition of cholinesterase activity. Prolonged respiratory depression with extended periods of apnea may occur. .

• tecovirimat

  tecovirimat will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Tecovirimat is a weak CYP3A4 inducer. Monitor sensitive CYP3A4 substrates for effectiveness if coadministered.

• thiotepa

  cyclophosphamide, thiotepa. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• tipranavir

  tipranavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• trastuzumab

  trastuzumab, cyclophosphamide. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Neutropenia or febrile neutropenia incidence were increased when trastuzumab was coadministered with myelosuppressive chemotherapy. .

• trastuzumab deruxtecan

  trastuzumab deruxtecan, cyclophosphamide. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Neutropenia or febrile neutropenia incidence were increased when trastuzumab was coadministered with myelosuppressive chemotherapy. .

• ublituximab

  ublituximab and cyclophosphamide both increase immunosuppressive effects; risk of infection. Modify Therapy/Monitor Closely. Owing to potential additive immunosuppressive effects, consider duration of effect and mechanism of action of these therapies if coadministered

• voclosporin

  voclosporin, cyclophosphamide. Either increases toxicity of the other by nephrotoxicity and/or ototoxicity. Modify Therapy/Monitor Closely. Coadministration with drugs associated with nephrotoxicity may increase the risk for acute and/or chronic nephrotoxicity.

Minor (341)

• abemaciclib

  cyclophosphamide will increase the level or effect of abemaciclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• abiraterone

  cyclophosphamide will increase the level or effect of abiraterone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• acalabrutinib

  cyclophosphamide will increase the level or effect of acalabrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• acetazolamide

  acetazolamide will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ado-trastuzumab emtansine

  cyclophosphamide will increase the level or effect of ado-trastuzumab emtansine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• alfentanil

  cyclophosphamide will increase the level or effect of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• alfuzosin

  cyclophosphamide will increase the level or effect of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• alpelisib

  cyclophosphamide will increase the level or effect of alpelisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• alprazolam

  cyclophosphamide will increase the level or effect of alprazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ambrisentan

  cyclophosphamide will increase the level or effect of ambrisentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• amiodarone

  cyclophosphamide will increase the level or effect of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• amlodipine

  cyclophosphamide will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• anastrozole

  anastrozole will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apalutamide

  cyclophosphamide will increase the level or effect of apalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apixaban

  cyclophosphamide will increase the level or effect of apixaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apomorphine

  cyclophosphamide will increase the level or effect of apomorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apremilast

  cyclophosphamide will decrease the level or effect of apremilast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• aprepitant

  cyclophosphamide will increase the level or effect of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• aripiprazole

  cyclophosphamide will increase the level or effect of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• armodafinil

  cyclophosphamide will increase the level or effect of armodafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• artemether/lumefantrine

  cyclophosphamide will decrease the level or effect of artemether/lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• aspirin

  aspirin will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• astemizole

  cyclophosphamide will increase the level or effect of astemizole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atazanavir

  cyclophosphamide will increase the level or effect of atazanavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atogepant

  cyclophosphamide will increase the level or effect of atogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atorvastatin

  cyclophosphamide will increase the level or effect of atorvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• avanafil

  cyclophosphamide will increase the level or effect of avanafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• avapritinib

  cyclophosphamide will increase the level or effect of avapritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• avatrombopag

  cyclophosphamide will increase the level or effect of avatrombopag by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• axitinib

  cyclophosphamide increases levels of axitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bedaquiline

  cyclophosphamide will increase the level or effect of bedaquiline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• benzhydrocodone/acetaminophen

  cyclophosphamide will increase the level or effect of benzhydrocodone/acetaminophen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• benzphetamine

  cyclophosphamide will increase the level or effect of benzphetamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bortezomib

  cyclophosphamide will increase the level or effect of bortezomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bosentan

  cyclophosphamide will increase the level or effect of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bosutinib

  cyclophosphamide will increase the level or effect of bosutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• brentuximab vedotin

  cyclophosphamide will increase the level or effect of brentuximab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• brexpiprazole

  cyclophosphamide will increase the level or effect of brexpiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• brigatinib

  cyclophosphamide will increase the level or effect of brigatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bromocriptine

  cyclophosphamide will increase the level or effect of bromocriptine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• budesonide

  cyclophosphamide will increase the level or effect of budesonide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• buprenorphine

  cyclophosphamide will increase the level or effect of buprenorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• buprenorphine transdermal

  cyclophosphamide will increase the level or effect of buprenorphine transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• buspirone

  cyclophosphamide will increase the level or effect of buspirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• busulfan

  cyclophosphamide will increase the level or effect of busulfan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cabozantinib

  cyclophosphamide will increase the level or effect of cabozantinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• calcifediol

  cyclophosphamide will increase the level or effect of calcifediol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• calcitriol

  cyclophosphamide will increase the level or effect of calcitriol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• capmatinib

  cyclophosphamide will increase the level or effect of capmatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• carbamazepine

  cyclophosphamide will increase the level or effect of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cariprazine

  cyclophosphamide will increase the level or effect of cariprazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• chlordiazepoxide

  cyclophosphamide will increase the level or effect of chlordiazepoxide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• chloroquine

  cyclophosphamide will increase the level or effect of chloroquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• chlorpheniramine

  cyclophosphamide will increase the level or effect of chlorpheniramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ciclesonide inhaled

  cyclophosphamide will increase the level or effect of ciclesonide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cilostazol

  cyclophosphamide will increase the level or effect of cilostazol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cisapride

  cyclophosphamide will increase the level or effect of cisapride by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• citalopram

  cyclophosphamide will increase the level or effect of citalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• clarithromycin

  cyclophosphamide will increase the level or effect of clarithromycin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• clonazepam

  cyclophosphamide will increase the level or effect of clonazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• clorazepate

  cyclophosphamide will increase the level or effect of clorazepate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cobicistat

  cyclophosphamide will increase the level or effect of cobicistat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cobimetinib

  cyclophosphamide will increase the level or effect of cobimetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cocaine topical

  cyclophosphamide will increase the level or effect of cocaine topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• colchicine

  cyclophosphamide will increase the level or effect of colchicine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• conivaptan

  cyclophosphamide will increase the level or effect of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• conjugated estrogens

  cyclophosphamide will increase the level or effect of conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• copanlisib

  cyclophosphamide will increase the level or effect of copanlisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cyclosporine

  cyclophosphamide will increase the level or effect of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dabrafenib

  cyclophosphamide will increase the level or effect of dabrafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• daclatasvir

  cyclophosphamide will increase the level or effect of daclatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dantrolene

  cyclophosphamide will increase the level or effect of dantrolene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dapsone

  cyclophosphamide will increase the level or effect of dapsone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• darifenacin

  cyclophosphamide will increase the level or effect of darifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• darunavir

  cyclophosphamide will increase the level or effect of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dasatinib

  cyclophosphamide will increase the level or effect of dasatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• deflazacort

  cyclophosphamide will increase the level or effect of deflazacort by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• delavirdine

  cyclophosphamide will increase the level or effect of delavirdine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dexamethasone

  cyclophosphamide will increase the level or effect of dexamethasone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dexlansoprazole

  cyclophosphamide will increase the level or effect of dexlansoprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• diazepam

  cyclophosphamide will increase the level or effect of diazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• diazepam intranasal

  cyclophosphamide will increase the level or effect of diazepam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dihydroergotamine

  cyclophosphamide will increase the level or effect of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dihydroergotamine intranasal

  cyclophosphamide will increase the level or effect of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• diltiazem

  cyclophosphamide will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• disopyramide

  cyclophosphamide will increase the level or effect of disopyramide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• docetaxel

  cyclophosphamide will increase the level or effect of docetaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doravirine

  cyclophosphamide will increase the level or effect of doravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doxepin cream

  cyclophosphamide will increase the level or effect of doxepin cream by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doxorubicin

  cyclophosphamide will increase the level or effect of doxorubicin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doxorubicin liposomal

  cyclophosphamide will increase the level or effect of doxorubicin liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dronabinol

  cyclophosphamide will increase the level or effect of dronabinol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dronedarone

  cyclophosphamide will increase the level or effect of dronedarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• duvelisib

  cyclophosphamide will increase the level or effect of duvelisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• efavirenz

  cyclophosphamide will increase the level or effect of efavirenz by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• elagolix

  cyclophosphamide will increase the level or effect of elagolix by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• elbasvir/grazoprevir

  cyclophosphamide will increase the level or effect of elbasvir/grazoprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• eletriptan

  cyclophosphamide will increase the level or effect of eletriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• eliglustat

  cyclophosphamide will increase the level or effect of eliglustat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• elvitegravir

  cyclophosphamide will increase the level or effect of elvitegravir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  cyclophosphamide will increase the level or effect of elvitegravir/cobicistat/emtricitabine/tenofovir DF by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• encorafenib

  cyclophosphamide will increase the level or effect of encorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• enfortumab vedotin

  cyclophosphamide will increase the level or effect of enfortumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• entrectinib

  cyclophosphamide will increase the level or effect of entrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• enzalutamide

  cyclophosphamide will increase the level or effect of enzalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• eplerenone

  cyclophosphamide will increase the level or effect of eplerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ergoloid mesylates

  cyclophosphamide will increase the level or effect of ergoloid mesylates by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ergonovine

  cyclophosphamide will increase the level or effect of ergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ergotamine

  cyclophosphamide will increase the level or effect of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erlotinib

  cyclophosphamide will increase the level or effect of erlotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erythromycin base

  cyclophosphamide will increase the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erythromycin ethylsuccinate

  cyclophosphamide will increase the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erythromycin lactobionate

  cyclophosphamide will increase the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erythromycin stearate

  cyclophosphamide will increase the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• escitalopram

  cyclophosphamide will increase the level or effect of escitalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• esomeprazole

  cyclophosphamide will increase the level or effect of esomeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estradiol

  cyclophosphamide will increase the level or effect of estradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estrogens conjugated synthetic

  cyclophosphamide will increase the level or effect of estrogens conjugated synthetic by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estrogens esterified

  cyclophosphamide will increase the level or effect of estrogens esterified by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estropipate

  cyclophosphamide will increase the level or effect of estropipate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• eszopiclone

  cyclophosphamide will increase the level or effect of eszopiclone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ethinylestradiol

  cyclophosphamide will increase the level or effect of ethinylestradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ethosuximide

  cyclophosphamide will increase the level or effect of ethosuximide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• etoposide

  cyclophosphamide will increase the level or effect of etoposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• etravirine

  cyclophosphamide will increase the level or effect of etravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• everolimus

  cyclophosphamide will increase the level or effect of everolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• exemestane

  cyclophosphamide will increase the level or effect of exemestane by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fedratinib

  cyclophosphamide will increase the level or effect of fedratinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• felbamate

  cyclophosphamide will increase the level or effect of felbamate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• felodipine

  cyclophosphamide will increase the level or effect of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibrate

  cyclophosphamide will increase the level or effect of fenofibrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibrate micronized

  cyclophosphamide will increase the level or effect of fenofibrate micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibric acid

  cyclophosphamide will increase the level or effect of fenofibric acid by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl

  cyclophosphamide will increase the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl intranasal

  cyclophosphamide will increase the level or effect of fentanyl intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl transdermal

  cyclophosphamide will increase the level or effect of fentanyl transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl transmucosal

  cyclophosphamide will increase the level or effect of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• finerenone

  cyclophosphamide will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• flibanserin

  cyclophosphamide will increase the level or effect of flibanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• flunisolide inhaled

  cyclophosphamide will increase the level or effect of flunisolide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• flurazepam

  cyclophosphamide will increase the level or effect of flurazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• flutamide

  cyclophosphamide will increase the level or effect of flutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fluticasone furoate

  cyclophosphamide will increase the level or effect of fluticasone furoate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fluticasone inhaled

  cyclophosphamide will increase the level or effect of fluticasone inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fosamprenavir

  cyclophosphamide will increase the level or effect of fosamprenavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fosaprepitant

  cyclophosphamide will increase the level or effect of fosaprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fostamatinib

  cyclophosphamide will increase the level or effect of fostamatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• gefitinib

  cyclophosphamide will increase the level or effect of gefitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• glasdegib

  cyclophosphamide will increase the level or effect of glasdegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• glecaprevir/pibrentasvir

  cyclophosphamide will increase the level or effect of glecaprevir/pibrentasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• guanfacine

  cyclophosphamide will increase the level or effect of guanfacine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• haloperidol

  cyclophosphamide will increase the level or effect of haloperidol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• hydrocodone

  cyclophosphamide will increase the level or effect of hydrocodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• hydroxyprogesterone caproate

  cyclophosphamide will increase the level or effect of hydroxyprogesterone caproate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ibrutinib

  cyclophosphamide will increase the level or effect of ibrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• idelalisib

  cyclophosphamide will increase the level or effect of idelalisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ifosfamide

  cyclophosphamide will increase the level or effect of ifosfamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• imatinib

  cyclophosphamide will increase the level or effect of imatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• indinavir

  cyclophosphamide will increase the level or effect of indinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• irinotecan

  cyclophosphamide will increase the level or effect of irinotecan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• irinotecan liposomal

  cyclophosphamide will increase the level or effect of irinotecan liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• isavuconazonium sulfate

  cyclophosphamide will increase the level or effect of isavuconazonium sulfate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• isosorbide dinitrate

  cyclophosphamide will increase the level or effect of isosorbide dinitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• isosorbide mononitrate

  cyclophosphamide will increase the level or effect of isosorbide mononitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• isradipine

  cyclophosphamide will increase the level or effect of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• istradefylline

  cyclophosphamide will increase the level or effect of istradefylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• itraconazole

  cyclophosphamide will increase the level or effect of itraconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ivacaftor

  cyclophosphamide will increase the level or effect of ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ivosidenib

  cyclophosphamide will increase the level or effect of ivosidenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ixabepilone

  cyclophosphamide will increase the level or effect of ixabepilone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ixazomib

  cyclophosphamide will increase the level or effect of ixazomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ketamine

  cyclophosphamide will increase the level or effect of ketamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lacosamide

  cyclophosphamide will increase the level or effect of lacosamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lansoprazole

  cyclophosphamide will increase the level or effect of lansoprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lapatinib

  cyclophosphamide will increase the level or effect of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• larotrectinib

  larotrectinib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  cyclophosphamide will increase the level or effect of larotrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lemborexant

  cyclophosphamide will increase the level or effect of lemborexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levamlodipine

  cyclophosphamide will increase the level or effect of levamlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levoketoconazole

  levoketoconazole will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levomilnacipran

  cyclophosphamide will increase the level or effect of levomilnacipran by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levonorgestrel intrauterine

  cyclophosphamide will increase the level or effect of levonorgestrel intrauterine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levonorgestrel oral

  cyclophosphamide will increase the level or effect of levonorgestrel oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• linagliptin

  cyclophosphamide will increase the level or effect of linagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lomitapide

  cyclophosphamide increases levels of lomitapide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lonafarnib

  cyclophosphamide will increase the level or effect of lonafarnib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lopinavir

  cyclophosphamide will increase the level or effect of lopinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lorlatinib

  cyclophosphamide will increase the level or effect of lorlatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• losartan

  cyclophosphamide will increase the level or effect of losartan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lovastatin

  cyclophosphamide will increase the level or effect of lovastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lumacaftor/ivacaftor

  cyclophosphamide will increase the level or effect of lumacaftor/ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lumefantrine

  cyclophosphamide will increase the level or effect of lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lurasidone

  cyclophosphamide will increase the level or effect of lurasidone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• macimorelin

  cyclophosphamide will increase the level or effect of macimorelin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• maraviroc

  cyclophosphamide will increase the level or effect of maraviroc by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• marijuana

  cyclophosphamide will increase the level or effect of marijuana by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• medroxyprogesterone

  cyclophosphamide will increase the level or effect of medroxyprogesterone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mefloquine

  cyclophosphamide will increase the level or effect of mefloquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mestranol

  cyclophosphamide will increase the level or effect of mestranol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• metaxalone

  cyclophosphamide will increase the level or effect of metaxalone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• methadone

  cyclophosphamide will increase the level or effect of methadone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• methylergonovine

  cyclophosphamide will increase the level or effect of methylergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• methylprednisolone

  cyclophosphamide will increase the level or effect of methylprednisolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• miconazole oral

  cyclophosphamide will increase the level or effect of miconazole oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• midazolam

  cyclophosphamide will increase the level or effect of midazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• midazolam intranasal

  cyclophosphamide will increase the level or effect of midazolam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• midostaurin

  cyclophosphamide will increase the level or effect of midostaurin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mifepristone

  cyclophosphamide will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mirtazapine

  cyclophosphamide will increase the level or effect of mirtazapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• modafinil

  cyclophosphamide will increase the level or effect of modafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• montelukast

  cyclophosphamide will increase the level or effect of montelukast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• naldemedine

  cyclophosphamide will increase the level or effect of naldemedine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• naloxegol

  cyclophosphamide will increase the level or effect of naloxegol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nefazodone

  cyclophosphamide will increase the level or effect of nefazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nelfinavir

  cyclophosphamide will increase the level or effect of nelfinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• netupitant/palonosetron

  cyclophosphamide will increase the level or effect of netupitant/palonosetron by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nevirapine

  cyclophosphamide will increase the level or effect of nevirapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nicardipine

  cyclophosphamide will increase the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nifedipine

  cyclophosphamide will increase the level or effect of nifedipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nilotinib

  cyclophosphamide will increase the level or effect of nilotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nimodipine

  cyclophosphamide will increase the level or effect of nimodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nisoldipine

  cyclophosphamide will increase the level or effect of nisoldipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• norethindrone

  cyclophosphamide will increase the level or effect of norethindrone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• norgestrel

  cyclophosphamide will increase the level or effect of norgestrel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• olaparib

  cyclophosphamide will increase the level or effect of olaparib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ombitasvir/paritaprevir/ritonavir

  cyclophosphamide will increase the level or effect of ombitasvir/paritaprevir/ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC)

  cyclophosphamide will increase the level or effect of ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• omeprazole

  cyclophosphamide will increase the level or effect of omeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ondansetron

  cyclophosphamide will increase the level or effect of ondansetron by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• osilodrostat

  cyclophosphamide will increase the level or effect of osilodrostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• osimertinib

  cyclophosphamide will increase the level or effect of osimertinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ospemifene

  cyclophosphamide will increase the level or effect of ospemifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• oxycodone

  cyclophosphamide will increase the level or effect of oxycodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• paclitaxel

  cyclophosphamide will increase the level or effect of paclitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• paclitaxel protein bound

  cyclophosphamide will increase the level or effect of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• palbociclib

  cyclophosphamide will increase the level or effect of palbociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• panobinostat

  cyclophosphamide will increase the level or effect of panobinostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• paricalcitol

  cyclophosphamide will increase the level or effect of paricalcitol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pazopanib

  cyclophosphamide will increase the level or effect of pazopanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• perampanel

  cyclophosphamide will increase the level or effect of perampanel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pexidartinib

  cyclophosphamide will increase the level or effect of pexidartinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pimavanserin

  cyclophosphamide will increase the level or effect of pimavanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pimozide

  cyclophosphamide will increase the level or effect of pimozide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pitolisant

  cyclophosphamide will increase the level or effect of pitolisant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• polatuzumab vedotin

  cyclophosphamide will increase the level or effect of polatuzumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pomalidomide

  cyclophosphamide will increase the level or effect of pomalidomide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ponatinib

  cyclophosphamide will increase the level or effect of ponatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• praziquantel

  cyclophosphamide will increase the level or effect of praziquantel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• primaquine

  cyclophosphamide will increase the level or effect of primaquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone intravaginal gel

  cyclophosphamide will increase the level or effect of progesterone intravaginal gel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone micronized

  cyclophosphamide will increase the level or effect of progesterone micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone, natural

  cyclophosphamide will increase the level or effect of progesterone, natural by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• quazepam

  cyclophosphamide will increase the level or effect of quazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• quetiapine

  cyclophosphamide will increase the level or effect of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• quinidine

  cyclophosphamide will increase the level or effect of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• quinine

  cyclophosphamide will increase the level or effect of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rabeprazole

  cyclophosphamide will increase the level or effect of rabeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ranolazine

  cyclophosphamide will increase the level or effect of ranolazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• regorafenib

  cyclophosphamide will increase the level or effect of regorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• repaglinide

  cyclophosphamide will increase the level or effect of repaglinide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ribociclib

  ribociclib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  cyclophosphamide will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rifabutin

  cyclophosphamide will increase the level or effect of rifabutin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rimegepant

  cyclophosphamide will increase the level or effect of rimegepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• riociguat

  cyclophosphamide will increase the level or effect of riociguat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ritonavir

  cyclophosphamide will increase the level or effect of ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rivaroxaban

  cyclophosphamide will increase the level or effect of rivaroxaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• roflumilast

  cyclophosphamide will increase the level or effect of roflumilast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rolapitant

  cyclophosphamide will increase the level or effect of rolapitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• romidepsin

  cyclophosphamide will increase the level or effect of romidepsin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ropivacaine

  cyclophosphamide will increase the level or effect of ropivacaine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ruxolitinib

  cyclophosphamide will increase the level or effect of ruxolitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ruxolitinib topical

  cyclophosphamide will increase the level or effect of ruxolitinib topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• salmeterol

  cyclophosphamide will increase the level or effect of salmeterol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• saquinavir

  cyclophosphamide will increase the level or effect of saquinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• saxagliptin

  cyclophosphamide will increase the level or effect of saxagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• selpercatinib

  cyclophosphamide will increase the level or effect of selpercatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sildenafil

  cyclophosphamide will increase the level or effect of sildenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• simvastatin

  cyclophosphamide will increase the level or effect of simvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• siponimod

  cyclophosphamide will increase the level or effect of siponimod by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sirolimus

  cyclophosphamide will increase the level or effect of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sofosbuvir/velpatasvir

  cyclophosphamide will increase the level or effect of sofosbuvir/velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• solifenacin

  cyclophosphamide will increase the level or effect of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sonidegib

  cyclophosphamide will increase the level or effect of sonidegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sorafenib

  cyclophosphamide will increase the level or effect of sorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• stiripentol

  cyclophosphamide will increase the level or effect of stiripentol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sufentanil

  cyclophosphamide will increase the level or effect of sufentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sufentanil SL

  cyclophosphamide will increase the level or effect of sufentanil SL by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sunitinib

  cyclophosphamide will increase the level or effect of sunitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• suvorexant

  cyclophosphamide will increase the level or effect of suvorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tacrolimus

  cyclophosphamide will increase the level or effect of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tacrolimus ointment

  cyclophosphamide will increase the level or effect of tacrolimus ointment by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tadalafil

  cyclophosphamide will increase the level or effect of tadalafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tamoxifen

  cyclophosphamide decreases effects of tamoxifen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tamsulosin

  cyclophosphamide will increase the level or effect of tamsulosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tasimelteon

  cyclophosphamide will increase the level or effect of tasimelteon by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tazemetostat

  cyclophosphamide will increase the level or effect of tazemetostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• temsirolimus

  cyclophosphamide will increase the level or effect of temsirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• teniposide

  cyclophosphamide will increase the level or effect of teniposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tetracycline

  cyclophosphamide will increase the level or effect of tetracycline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tezacaftor

  cyclophosphamide will increase the level or effect of tezacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• theophylline

  cyclophosphamide will increase the level or effect of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tiagabine

  cyclophosphamide will increase the level or effect of tiagabine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ticagrelor

  cyclophosphamide will increase the level or effect of ticagrelor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ticlopidine

  cyclophosphamide will increase the level or effect of ticlopidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tinidazole

  cyclophosphamide will increase the level or effect of tinidazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tipranavir

  cyclophosphamide will increase the level or effect of tipranavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tofacitinib

  cyclophosphamide will increase the level or effect of tofacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tolterodine

  cyclophosphamide will increase the level or effect of tolterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tolvaptan

  cyclophosphamide will increase the level or effect of tolvaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• toremifene

  cyclophosphamide will increase the level or effect of toremifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trabectedin

  cyclophosphamide will increase the level or effect of trabectedin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tramadol

  cyclophosphamide will increase the level or effect of tramadol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trazodone

  cyclophosphamide will increase the level or effect of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• triazolam

  cyclophosphamide will increase the level or effect of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trimethoprim

  cyclophosphamide will increase the level or effect of trimethoprim by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trimipramine

  cyclophosphamide will increase the level or effect of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ubrogepant

  cyclophosphamide will increase the level or effect of ubrogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ulipristal

  cyclophosphamide will increase the level or effect of ulipristal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• umeclidinium bromide/vilanterol inhaled

  cyclophosphamide will increase the level or effect of umeclidinium bromide/vilanterol inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• upadacitinib

  cyclophosphamide will increase the level or effect of upadacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• valbenazine

  cyclophosphamide will increase the level or effect of valbenazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vandetanib

  cyclophosphamide will increase the level or effect of vandetanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vardenafil

  cyclophosphamide will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• velpatasvir

  cyclophosphamide will increase the level or effect of velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vemurafenib

  cyclophosphamide will increase the level or effect of vemurafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• venetoclax

  cyclophosphamide will increase the level or effect of venetoclax by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• venlafaxine

  cyclophosphamide will increase the level or effect of venlafaxine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• verapamil

  cyclophosphamide will increase the level or effect of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vilanterol/fluticasone furoate inhaled

  cyclophosphamide will increase the level or effect of vilanterol/fluticasone furoate inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vilazodone

  cyclophosphamide will increase the level or effect of vilazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vinblastine

  cyclophosphamide will increase the level or effect of vinblastine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vincristine

  cyclophosphamide will increase the level or effect of vincristine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vincristine liposomal

  cyclophosphamide will increase the level or effect of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vinorelbine

  cyclophosphamide will increase the level or effect of vinorelbine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vorapaxar

  cyclophosphamide will increase the level or effect of vorapaxar by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• voriconazole

  cyclophosphamide will increase the level or effect of voriconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vortioxetine

  cyclophosphamide will increase the level or effect of vortioxetine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• voxilaprevir

  cyclophosphamide will increase the level or effect of voxilaprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• warfarin

  warfarin will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• zanubrutinib

  cyclophosphamide will increase the level or effect of zanubrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• zolpidem

  cyclophosphamide will increase the level or effect of zolpidem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• zonisamide

  cyclophosphamide will increase the level or effect of zonisamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• abametapir

  Serious - Use Alternative (2)abametapir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP3A4 substrates. If not feasible, avoid use of abametapir.
  
  abametapir will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Avoid or Use Alternate Drug. For 2 weeks after abametapir application, avoid taking drugs that are CYP2B6 substrates. If not feasible, avoid use of abametapir.

• abemaciclib

  Minor (1)cyclophosphamide will increase the level or effect of abemaciclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• abiraterone

  Minor (1)cyclophosphamide will increase the level or effect of abiraterone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• acalabrutinib

  Monitor Closely (1)acalabrutinib, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration may increase risk of myelosuppressive effects.Minor (1)cyclophosphamide will increase the level or effect of acalabrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• acetazolamide

  Minor (1)acetazolamide will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• adenovirus types 4 and 7 live, oral

  Serious - Use Alternative (1)cyclophosphamide decreases effects of adenovirus types 4 and 7 live, oral by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressives may diminish therapeutic effects of vaccines and increase risk of adverse effects (increased risk of infection). Live-attenuated vaccines should be avoided for at least 3mo after cessation of immunosuppressive therapy.

• ado-trastuzumab emtansine

  Minor (1)cyclophosphamide will increase the level or effect of ado-trastuzumab emtansine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• alfentanil

  Minor (1)cyclophosphamide will increase the level or effect of alfentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• alfuzosin

  Minor (1)cyclophosphamide will increase the level or effect of alfuzosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• allopurinol

  Monitor Closely (1)allopurinol increases toxicity of cyclophosphamide by decreasing metabolism. Use Caution/Monitor.

• alpelisib

  Minor (1)cyclophosphamide will increase the level or effect of alpelisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• alprazolam

  Minor (1)cyclophosphamide will increase the level or effect of alprazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ambrisentan

  Minor (1)cyclophosphamide will increase the level or effect of ambrisentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• amiodarone

  Monitor Closely (1)amiodarone increases toxicity of cyclophosphamide by unspecified interaction mechanism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• amlodipine

  Minor (1)cyclophosphamide will increase the level or effect of amlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• anastrozole

  Minor (1)anastrozole will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• antithrombin III

  Monitor Closely (1)cyclophosphamide increases effects of antithrombin III by unknown mechanism. Use Caution/Monitor.

• apalutamide

  Serious - Use Alternative (1)apalutamide will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Coadministration of apalutamide, a strong CYP3A4 inducer, with drugs that are CYP3A4 substrates can result in lower exposure to these medications. Avoid or substitute another drug for these medications when possible. Evaluate for loss of therapeutic effect if medication must be coadministered. Adjust dose according to prescribing information if needed.Minor (1)cyclophosphamide will increase the level or effect of apalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apixaban

  Minor (1)cyclophosphamide will increase the level or effect of apixaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apomorphine

  Minor (1)cyclophosphamide will increase the level or effect of apomorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• apremilast

  Minor (1)cyclophosphamide will decrease the level or effect of apremilast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• aprepitant

  Minor (1)cyclophosphamide will increase the level or effect of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• argatroban

  Monitor Closely (1)cyclophosphamide increases effects of argatroban by unknown mechanism. Use Caution/Monitor. Additive risk of bleeding may be seen in thrombocytopenic patients receiving antineoplastic agents in combination with argatroban because these agents can decrease platelet counts.

• aripiprazole

  Minor (1)cyclophosphamide will increase the level or effect of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• armodafinil

  Minor (1)cyclophosphamide will increase the level or effect of armodafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• artemether/lumefantrine

  Minor (1)cyclophosphamide will decrease the level or effect of artemether/lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• aspirin

  Minor (1)aspirin will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• astemizole

  Minor (1)cyclophosphamide will increase the level or effect of astemizole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atazanavir

  Monitor Closely (2)atazanavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  atazanavir increases toxicity of cyclophosphamide by unspecified interaction mechanism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of atazanavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atogepant

  Minor (1)cyclophosphamide will increase the level or effect of atogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• atorvastatin

  Minor (1)cyclophosphamide will increase the level or effect of atorvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• avanafil

  Minor (1)cyclophosphamide will increase the level or effect of avanafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• avapritinib

  Minor (1)cyclophosphamide will increase the level or effect of avapritinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• avatrombopag

  Minor (1)cyclophosphamide will increase the level or effect of avatrombopag by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• axicabtagene ciloleucel

  Serious - Use Alternative (1)cyclophosphamide, axicabtagene ciloleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• axitinib

  Minor (1)cyclophosphamide increases levels of axitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bedaquiline

  Minor (1)cyclophosphamide will increase the level or effect of bedaquiline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• belatacept

  Monitor Closely (1)belatacept and cyclophosphamide both increase immunosuppressive effects; risk of infection. Use Caution/Monitor.

• belzutifan

  Monitor Closely (1)belzutifan will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. If unable to avoid coadministration of belzutifan with sensitive CYP3A4 substrates, consider increasing the sensitive CYP3A4 substrate dose in accordance with its prescribing information.

• bendamustine

  Monitor Closely (1)bendamustine, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• benzhydrocodone/acetaminophen

  Minor (1)cyclophosphamide will increase the level or effect of benzhydrocodone/acetaminophen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• benzphetamine

  Minor (1)cyclophosphamide will increase the level or effect of benzphetamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bivalirudin

  Monitor Closely (1)cyclophosphamide increases effects of bivalirudin by unknown mechanism. Use Caution/Monitor. Additive risk of bleeding may be seen in thrombocytopenic patients receiving antineoplastic agents in combination with anticoagulants such as bivalirudin.

• bortezomib

  Minor (1)cyclophosphamide will increase the level or effect of bortezomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bosentan

  Minor (1)cyclophosphamide will increase the level or effect of bosentan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bosutinib

  Minor (1)cyclophosphamide will increase the level or effect of bosutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• brentuximab vedotin

  Minor (1)cyclophosphamide will increase the level or effect of brentuximab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• brexpiprazole

  Minor (1)cyclophosphamide will increase the level or effect of brexpiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• brexucabtagene autoleucel

  Serious - Use Alternative (1)cyclophosphamide, brexucabtagene autoleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• brigatinib

  Minor (1)cyclophosphamide will increase the level or effect of brigatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bromocriptine

  Minor (1)cyclophosphamide will increase the level or effect of bromocriptine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• budesonide

  Minor (1)cyclophosphamide will increase the level or effect of budesonide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• bupivacaine implant

  Monitor Closely (1)cyclophosphamide, bupivacaine implant. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: Local anesthetics may increase the risk of developing methemoglobinemia when concurrently exposed to drugs that also cause methemoglobinemia.

• buprenorphine

  Minor (1)cyclophosphamide will increase the level or effect of buprenorphine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• buprenorphine transdermal

  Minor (1)cyclophosphamide will increase the level or effect of buprenorphine transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• buspirone

  Minor (1)cyclophosphamide will increase the level or effect of buspirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• busulfan

  Monitor Closely (2)cyclophosphamide, busulfan. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor.
  
  busulfan, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.Minor (1)cyclophosphamide will increase the level or effect of busulfan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• butabarbital

  Monitor Closely (1)butabarbital will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• cabozantinib

  Minor (1)cyclophosphamide will increase the level or effect of cabozantinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• calcifediol

  Minor (1)cyclophosphamide will increase the level or effect of calcifediol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• calcitriol

  Minor (1)cyclophosphamide will increase the level or effect of calcitriol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cannabidiol

  Monitor Closely (1)cannabidiol, cyclophosphamide. affecting hepatic enzyme CYP2B6 metabolism. Modify Therapy/Monitor Closely. Owing to the potential for both CYP2B6 induction and inhibition with the coadministration of CYP2B6 substrates and cannabidiol, consider reducing dosage adjustment of CYP2B6 substrates as clinically appropriate.

• capmatinib

  Minor (1)cyclophosphamide will increase the level or effect of capmatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• carbamazepine

  Monitor Closely (1)carbamazepine will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• carboplatin

  Monitor Closely (1)carboplatin, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• cariprazine

  Minor (1)cyclophosphamide will increase the level or effect of cariprazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• carmustine

  Monitor Closely (1)carmustine, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• cenobamate

  Monitor Closely (2)cenobamate will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP2B6 substrate, as needed, when coadministered with cenobamate.
  
  cenobamate will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Increase dose of CYP3A4 substrate, as needed, when coadministered with cenobamate.

• chlorambucil

  Monitor Closely (1)chlorambucil, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• chlordiazepoxide

  Minor (1)cyclophosphamide will increase the level or effect of chlordiazepoxide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• chloroquine

  Minor (1)cyclophosphamide will increase the level or effect of chloroquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• chlorpheniramine

  Minor (1)cyclophosphamide will increase the level or effect of chlorpheniramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cholera vaccine

  Monitor Closely (1)cyclophosphamide decreases effects of cholera vaccine by immunosuppressive effects; risk of infection. Modify Therapy/Monitor Closely. Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs and corticosteroids (used in greater than physiologic doses), may reduce the immune response to cholera vaccine.

• ciclesonide inhaled

  Minor (1)cyclophosphamide will increase the level or effect of ciclesonide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cilostazol

  Minor (1)cyclophosphamide will increase the level or effect of cilostazol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ciltacabtagene autoleucel

  Serious - Use Alternative (1)cyclophosphamide, ciltacabtagene autoleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• cisapride

  Minor (1)cyclophosphamide will increase the level or effect of cisapride by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cisplatin

  Monitor Closely (1)cisplatin, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• citalopram

  Minor (1)cyclophosphamide will increase the level or effect of citalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• clarithromycin

  Minor (1)cyclophosphamide will increase the level or effect of clarithromycin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• clonazepam

  Minor (1)cyclophosphamide will increase the level or effect of clonazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• clorazepate

  Minor (1)cyclophosphamide will increase the level or effect of clorazepate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cobicistat

  Minor (1)cyclophosphamide will increase the level or effect of cobicistat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cobimetinib

  Minor (1)cyclophosphamide will increase the level or effect of cobimetinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• cocaine topical

  Minor (1)cyclophosphamide will increase the level or effect of cocaine topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• colchicine

  Minor (1)cyclophosphamide will increase the level or effect of colchicine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• conivaptan

  Minor (1)cyclophosphamide will increase the level or effect of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• conjugated estrogens

  Minor (1)cyclophosphamide will increase the level or effect of conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• copanlisib

  Minor (1)cyclophosphamide will increase the level or effect of copanlisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• crizotinib

  Monitor Closely (1)cyclophosphamide will increase the level or effect of crizotinib by aldehyde dehydrogenase inhibition. Use Caution/Monitor.

• crofelemer

  Monitor Closely (1)crofelemer increases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Crofelemer has the potential to inhibit CYP3A4 at concentrations expected in the gut; unlikely to inhibit systemically because minimally absorbed.

• cyclosporine

  Minor (1)cyclophosphamide will increase the level or effect of cyclosporine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dabrafenib

  Monitor Closely (1)dabrafenib will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely.Minor (1)cyclophosphamide will increase the level or effect of dabrafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dacarbazine

  Monitor Closely (1)cyclophosphamide, dacarbazine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• daclatasvir

  Minor (1)cyclophosphamide will increase the level or effect of daclatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dalteparin

  Monitor Closely (1)cyclophosphamide increases effects of dalteparin by unknown mechanism. Use Caution/Monitor. Due to potential thrombocytopenic effects of cyclophosphamide, an additive risk of bleeding may be seen in patients receiving concomitant anticoagulants.

• dantrolene

  Minor (1)cyclophosphamide will increase the level or effect of dantrolene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dapsone

  Minor (1)cyclophosphamide will increase the level or effect of dapsone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• darifenacin

  Minor (1)cyclophosphamide will increase the level or effect of darifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• darunavir

  Monitor Closely (1)darunavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dasatinib

  Minor (1)cyclophosphamide will increase the level or effect of dasatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• deferiprone

  Serious - Use Alternative (1)deferiprone, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Avoid or Use Alternate Drug. Avoid use of deferiprone with other drugs known to be associated with neutropenia or agranulocytosis; if an alternative is not possible, monitor absolute neutrophil count more frequently.

• deflazacort

  Minor (1)cyclophosphamide will increase the level or effect of deflazacort by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• delavirdine

  Minor (1)cyclophosphamide will increase the level or effect of delavirdine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dengue vaccine

  Monitor Closely (1)cyclophosphamide decreases effects of dengue vaccine by immunosuppressive effects; risk of infection. Use Caution/Monitor. Immunosuppressive therapies (eg, irradiation, antimetabolites, alkylating agents, cytotoxic drugs, corticosteroids [greater than physiologic doses]) may reduce immune response to dengue vaccine.

• denosumab

  Monitor Closely (1)cyclophosphamide, denosumab. Other (see comment). Use Caution/Monitor. Comment: Caution should be taken in patients on concomitant immunosuppressants or with impaired immune systems because of increased risk for serious infections.

• dexamethasone

  Minor (1)cyclophosphamide will increase the level or effect of dexamethasone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dexlansoprazole

  Minor (1)cyclophosphamide will increase the level or effect of dexlansoprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• diazepam

  Minor (1)cyclophosphamide will increase the level or effect of diazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• diazepam intranasal

  Minor (1)cyclophosphamide will increase the level or effect of diazepam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• digoxin

  Monitor Closely (1)cyclophosphamide decreases levels of digoxin by inhibition of GI absorption. Applies only to oral form of both agents. Use Caution/Monitor.

• dihydroergotamine

  Minor (1)cyclophosphamide will increase the level or effect of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dihydroergotamine intranasal

  Minor (1)cyclophosphamide will increase the level or effect of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• diltiazem

  Minor (1)cyclophosphamide will increase the level or effect of diltiazem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• disopyramide

  Minor (1)cyclophosphamide will increase the level or effect of disopyramide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• docetaxel

  Minor (1)cyclophosphamide will increase the level or effect of docetaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doravirine

  Minor (1)cyclophosphamide will increase the level or effect of doravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doxepin cream

  Minor (1)cyclophosphamide will increase the level or effect of doxepin cream by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doxorubicin

  Monitor Closely (1)doxorubicin increases toxicity of cyclophosphamide by unspecified interaction mechanism. Use Caution/Monitor. Increased risk of hemorrhagic cystitis.Minor (1)cyclophosphamide will increase the level or effect of doxorubicin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• doxorubicin liposomal

  Monitor Closely (1)doxorubicin liposomal increases toxicity of cyclophosphamide by unspecified interaction mechanism. Use Caution/Monitor. Increased risk of hemorrhagic cystitis.Minor (1)cyclophosphamide will increase the level or effect of doxorubicin liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dronabinol

  Minor (1)cyclophosphamide will increase the level or effect of dronabinol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• dronedarone

  Minor (1)cyclophosphamide will increase the level or effect of dronedarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• duvelisib

  Minor (1)cyclophosphamide will increase the level or effect of duvelisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• efavirenz

  Monitor Closely (1)efavirenz will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of efavirenz by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• elagolix

  Monitor Closely (1)elagolix will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Elagolix is a weak-to-moderate CYP3A4 inducer. Monitor CYP3A substrates if coadministered. Consider increasing CYP3A substrate dose if needed.Minor (1)cyclophosphamide will increase the level or effect of elagolix by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• elbasvir/grazoprevir

  Minor (1)cyclophosphamide will increase the level or effect of elbasvir/grazoprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• eletriptan

  Minor (1)cyclophosphamide will increase the level or effect of eletriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• eliglustat

  Minor (1)cyclophosphamide will increase the level or effect of eliglustat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• elvitegravir

  Minor (1)cyclophosphamide will increase the level or effect of elvitegravir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• elvitegravir/cobicistat/emtricitabine/tenofovir DF

  Monitor Closely (1)elvitegravir/cobicistat/emtricitabine/tenofovir DF increases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Cobicistat is a CYP3A4 inhibitor; contraindicated with CYP3A4 substrates for which elevated plasma concentrations are associated with serious and/or life-threatening events.Minor (1)cyclophosphamide will increase the level or effect of elvitegravir/cobicistat/emtricitabine/tenofovir DF by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• encorafenib

  Minor (1)cyclophosphamide will increase the level or effect of encorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• enfortumab vedotin

  Minor (1)cyclophosphamide will increase the level or effect of enfortumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• enoxaparin

  Monitor Closely (1)cyclophosphamide increases effects of enoxaparin by unknown mechanism. Use Caution/Monitor. Due to potential thrombocytopenic effects of cyclophosphamide, an additive risk of bleeding may be seen in patients receiving concomitant anticoagulants.

• entrectinib

  Minor (1)cyclophosphamide will increase the level or effect of entrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• enzalutamide

  Minor (1)cyclophosphamide will increase the level or effect of enzalutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• eplerenone

  Minor (1)cyclophosphamide will increase the level or effect of eplerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ergoloid mesylates

  Minor (1)cyclophosphamide will increase the level or effect of ergoloid mesylates by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ergonovine

  Minor (1)cyclophosphamide will increase the level or effect of ergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ergotamine

  Minor (1)cyclophosphamide will increase the level or effect of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erlotinib

  Minor (1)cyclophosphamide will increase the level or effect of erlotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erythromycin base

  Minor (1)cyclophosphamide will increase the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erythromycin ethylsuccinate

  Minor (1)cyclophosphamide will increase the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erythromycin lactobionate

  Minor (1)cyclophosphamide will increase the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• erythromycin stearate

  Minor (1)cyclophosphamide will increase the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• escitalopram

  Minor (1)cyclophosphamide will increase the level or effect of escitalopram by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• esomeprazole

  Minor (1)cyclophosphamide will increase the level or effect of esomeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estradiol

  Minor (1)cyclophosphamide will increase the level or effect of estradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estrogens conjugated synthetic

  Minor (1)cyclophosphamide will increase the level or effect of estrogens conjugated synthetic by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estrogens esterified

  Minor (1)cyclophosphamide will increase the level or effect of estrogens esterified by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• estropipate

  Minor (1)cyclophosphamide will increase the level or effect of estropipate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• eszopiclone

  Minor (1)cyclophosphamide will increase the level or effect of eszopiclone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• etanercept

  Serious - Use Alternative (1)etanercept, cyclophosphamide. Mechanism: unspecified interaction mechanism. Avoid or Use Alternate Drug. The incidence of noncutaneous solid malignancies may be increased in patients receiving TNF blocking agents with cyclophosphamide. Coadministration is not recommended.

• ethinylestradiol

  Minor (1)cyclophosphamide will increase the level or effect of ethinylestradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ethosuximide

  Minor (1)cyclophosphamide will increase the level or effect of ethosuximide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• etoposide

  Minor (1)cyclophosphamide will increase the level or effect of etoposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• etravirine

  Minor (1)cyclophosphamide will increase the level or effect of etravirine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• everolimus

  Minor (1)cyclophosphamide will increase the level or effect of everolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• exemestane

  Minor (1)cyclophosphamide will increase the level or effect of exemestane by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fedratinib

  Monitor Closely (1)fedratinib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Adjust dose of drugs that are CYP3A4 substrates as necessary.Minor (1)cyclophosphamide will increase the level or effect of fedratinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• felbamate

  Minor (1)cyclophosphamide will increase the level or effect of felbamate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• felodipine

  Minor (1)cyclophosphamide will increase the level or effect of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibrate

  Minor (1)cyclophosphamide will increase the level or effect of fenofibrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibrate micronized

  Minor (1)cyclophosphamide will increase the level or effect of fenofibrate micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fenofibric acid

  Minor (1)cyclophosphamide will increase the level or effect of fenofibric acid by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl

  Minor (1)cyclophosphamide will increase the level or effect of fentanyl by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl intranasal

  Minor (1)cyclophosphamide will increase the level or effect of fentanyl intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl transdermal

  Minor (1)cyclophosphamide will increase the level or effect of fentanyl transdermal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fentanyl transmucosal

  Minor (1)cyclophosphamide will increase the level or effect of fentanyl transmucosal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fexinidazole

  Serious - Use Alternative (2)fexinidazole will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Avoid or Use Alternate Drug. Coadministration may decrease plasma concentrations of CYP2B6 substrates owing to fexinidazole inducing CYP2B6.
  
  fexinidazole will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Fexinidazole inhibits CYP3A4. Coadministration may increase risk for adverse effects of CYP3A4 substrates.

• finerenone

  Minor (1)cyclophosphamide will increase the level or effect of finerenone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fingolimod

  Monitor Closely (1)cyclophosphamide increases effects of fingolimod by immunosuppressive effects; risk of infection. Modify Therapy/Monitor Closely. Concomitant therapy is expected to increase the risk of immunosuppression. Use caution when switching patients from long-acting therapies with immune effects. .

• flibanserin

  Minor (1)cyclophosphamide will increase the level or effect of flibanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• flunisolide inhaled

  Minor (1)cyclophosphamide will increase the level or effect of flunisolide inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• flurazepam

  Minor (1)cyclophosphamide will increase the level or effect of flurazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• flutamide

  Minor (1)cyclophosphamide will increase the level or effect of flutamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fluticasone furoate

  Minor (1)cyclophosphamide will increase the level or effect of fluticasone furoate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fluticasone inhaled

  Minor (1)cyclophosphamide will increase the level or effect of fluticasone inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fluvoxamine

  Monitor Closely (1)fluvoxamine will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• fondaparinux

  Monitor Closely (1)cyclophosphamide increases effects of fondaparinux by unknown mechanism. Use Caution/Monitor. Due to potential thrombocytopenic effects of cyclophosphamide, an additive risk of bleeding may be seen in patients receiving concomitant anticoagulants.

• fosamprenavir

  Minor (1)cyclophosphamide will increase the level or effect of fosamprenavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fosaprepitant

  Minor (1)cyclophosphamide will increase the level or effect of fosaprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• fostamatinib

  Minor (1)cyclophosphamide will increase the level or effect of fostamatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• gefitinib

  Minor (1)cyclophosphamide will increase the level or effect of gefitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• glasdegib

  Minor (1)cyclophosphamide will increase the level or effect of glasdegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• glecaprevir/pibrentasvir

  Minor (1)cyclophosphamide will increase the level or effect of glecaprevir/pibrentasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• guanfacine

  Minor (1)cyclophosphamide will increase the level or effect of guanfacine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• haloperidol

  Minor (1)cyclophosphamide will increase the level or effect of haloperidol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• heparin

  Monitor Closely (1)cyclophosphamide increases effects of heparin by unknown mechanism. Use Caution/Monitor. Due to potential thrombocytopenic effects of cyclophosphamide, an additive risk of bleeding may be seen in patients receiving concomitant anticoagulants.

• hydrochlorothiazide

  Serious - Use Alternative (1)hydrochlorothiazide increases toxicity of cyclophosphamide by decreasing renal clearance. Avoid or Use Alternate Drug. Increased myelosuppressive effects.

• hydrocodone

  Minor (1)cyclophosphamide will increase the level or effect of hydrocodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• hydroxyprogesterone caproate

  Minor (1)cyclophosphamide will increase the level or effect of hydroxyprogesterone caproate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• hydroxyurea

  Monitor Closely (1)cyclophosphamide, hydroxyurea. Other (see comment). Use Caution/Monitor. Comment: Combination may increase risk of myelosuppression.

• ibrutinib

  Minor (1)cyclophosphamide will increase the level or effect of ibrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• idarubicin

  Serious - Use Alternative (1)cyclophosphamide increases toxicity of idarubicin by Other (see comment). Avoid or Use Alternate Drug. Comment: May increase formation of toxic anthracycline metabolites in heart tissue.

• idecabtagene vicleucel

  Serious - Use Alternative (1)cyclophosphamide, idecabtagene vicleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• idelalisib

  Serious - Use Alternative (1)idelalisib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Idelalisib is a strong CYP3A inhibitor; avoid coadministration with sensitive CYP3A substratesMinor (1)cyclophosphamide will increase the level or effect of idelalisib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ifosfamide

  Monitor Closely (2)ifosfamide, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration with ifosfamide may increase the risk of immunosuppression and myelosuppression.
  
  cyclophosphamide, ifosfamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.Minor (1)cyclophosphamide will increase the level or effect of ifosfamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• iloperidone

  Monitor Closely (1)iloperidone increases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Iloperidone is a time-dependent CYP3A inhibitor and may lead to increased plasma levels of drugs predominantly eliminated by CYP3A4.

• imatinib

  Minor (1)cyclophosphamide will increase the level or effect of imatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• indinavir

  Monitor Closely (1)indinavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of indinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• influenza A (H5N1) vaccine

  Monitor Closely (1)cyclophosphamide decreases effects of influenza A (H5N1) vaccine by pharmacodynamic antagonism. Use Caution/Monitor. Immunosuppressive therapies may reduce immune response to H5N1 vaccine.

• influenza virus vaccine (H5N1), adjuvanted

  Monitor Closely (1)cyclophosphamide decreases effects of influenza virus vaccine (H5N1), adjuvanted by pharmacodynamic antagonism. Use Caution/Monitor. Immunosuppressive therapies may reduce immune response to H5N1 vaccine.

• influenza virus vaccine quadrivalent, adjuvanted

  Serious - Use Alternative (1)cyclophosphamide decreases effects of influenza virus vaccine quadrivalent, adjuvanted by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressive drugs may reduce the immune response to influenza vaccine.

• influenza virus vaccine trivalent, adjuvanted

  Serious - Use Alternative (1)cyclophosphamide decreases effects of influenza virus vaccine trivalent, adjuvanted by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressive drugs may reduce the immune response to influenza vaccine.

• irinotecan

  Minor (1)cyclophosphamide will increase the level or effect of irinotecan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• irinotecan liposomal

  Minor (1)cyclophosphamide will increase the level or effect of irinotecan liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• isavuconazonium sulfate

  Monitor Closely (1)cyclophosphamide and isavuconazonium sulfate both decrease immunosuppressive effects; risk of infection. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of isavuconazonium sulfate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• isosorbide dinitrate

  Minor (1)cyclophosphamide will increase the level or effect of isosorbide dinitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• isosorbide mononitrate

  Minor (1)cyclophosphamide will increase the level or effect of isosorbide mononitrate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• isradipine

  Minor (1)cyclophosphamide will increase the level or effect of isradipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• istradefylline

  Monitor Closely (1)istradefylline will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Istradefylline 40 mg/day increased peak levels and AUC of CYP3A4 substrates in clinical trials. This effect was not observed with istradefylline 20 mg/day. Consider dose reduction of sensitive CYP3A4 substrates.Minor (1)cyclophosphamide will increase the level or effect of istradefylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• itraconazole

  Minor (1)cyclophosphamide will increase the level or effect of itraconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ivacaftor

  Minor (1)cyclophosphamide will increase the level or effect of ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ivosidenib

  Minor (1)cyclophosphamide will increase the level or effect of ivosidenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ixabepilone

  Minor (1)cyclophosphamide will increase the level or effect of ixabepilone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ixazomib

  Minor (1)cyclophosphamide will increase the level or effect of ixazomib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ketamine

  Minor (1)cyclophosphamide will increase the level or effect of ketamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ketoconazole

  Monitor Closely (1)ketoconazole increases toxicity of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• lacosamide

  Minor (1)cyclophosphamide will increase the level or effect of lacosamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lansoprazole

  Minor (1)cyclophosphamide will increase the level or effect of lansoprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lapatinib

  Minor (1)cyclophosphamide will increase the level or effect of lapatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• larotrectinib

  Minor (2)larotrectinib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  cyclophosphamide will increase the level or effect of larotrectinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lemborexant

  Monitor Closely (1)lemborexant will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Modify Therapy/Monitor Closely. Monitor CYP2B6 substrate for adequate clinical response. Consider increasing the CYP2B6 substrate dose according to specific prescribing recommendations.Minor (1)cyclophosphamide will increase the level or effect of lemborexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lenacapavir

  Monitor Closely (1)lenacapavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Lencapavir (a moderate CYP3A4 inhibitor) may increase CYP3A4 substrates initiated within 9 months after last SC dose of lenacapavir, which may increase potential risk of adverse reactions of CYP3A4 substrates.

• letermovir

  Monitor Closely (1)letermovir increases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• levamlodipine

  Minor (1)cyclophosphamide will increase the level or effect of levamlodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levoketoconazole

  Minor (1)levoketoconazole will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levomilnacipran

  Minor (1)cyclophosphamide will increase the level or effect of levomilnacipran by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levonorgestrel intrauterine

  Minor (1)cyclophosphamide will increase the level or effect of levonorgestrel intrauterine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• levonorgestrel oral

  Minor (1)cyclophosphamide will increase the level or effect of levonorgestrel oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• linagliptin

  Minor (1)cyclophosphamide will increase the level or effect of linagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lisocabtagene maraleucel

  Serious - Use Alternative (1)cyclophosphamide, lisocabtagene maraleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• lomitapide

  Minor (1)cyclophosphamide increases levels of lomitapide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lomustine

  Monitor Closely (2)lomustine, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration with lomustine may increase the risk of immunosuppression and myelosuppression.
  
  cyclophosphamide, lomustine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• lonafarnib

  Serious - Use Alternative (1)lonafarnib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid coadministration with sensitive CYP3A substrates. If coadministration unavoidable, monitor for adverse reactions and reduce CYP3A substrate dose in accordance with product labeling.Minor (1)cyclophosphamide will increase the level or effect of lonafarnib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lopinavir

  Monitor Closely (1)lopinavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of lopinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lorlatinib

  Minor (1)cyclophosphamide will increase the level or effect of lorlatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• losartan

  Minor (1)cyclophosphamide will increase the level or effect of losartan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lovastatin

  Minor (1)cyclophosphamide will increase the level or effect of lovastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lumacaftor/ivacaftor

  Monitor Closely (1)lumacaftor/ivacaftor, cyclophosphamide. affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor. In vitro studies suggest that lumacaftor may induce and ivacaftor may inhibit CYP2B6 substrates. .Minor (1)cyclophosphamide will increase the level or effect of lumacaftor/ivacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lumefantrine

  Minor (1)cyclophosphamide will increase the level or effect of lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• lurasidone

  Minor (1)cyclophosphamide will increase the level or effect of lurasidone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• macimorelin

  Minor (1)cyclophosphamide will increase the level or effect of macimorelin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• maraviroc

  Minor (1)cyclophosphamide will increase the level or effect of maraviroc by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• marijuana

  Minor (1)cyclophosphamide will increase the level or effect of marijuana by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mechlorethamine

  Monitor Closely (2)mechlorethamine, cyclophosphamide. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration with mechlorethamine may increase the risk of immunosuppression and myelosuppression.
  
  cyclophosphamide, mechlorethamine. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Coadministration with mechlorethamine may increase the risk of immunosuppression and myelosuppression.

• medroxyprogesterone

  Minor (1)cyclophosphamide will increase the level or effect of medroxyprogesterone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mefloquine

  Minor (1)cyclophosphamide will increase the level or effect of mefloquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• meningococcal group B vaccine

  Monitor Closely (1)cyclophosphamide decreases effects of meningococcal group B vaccine by pharmacodynamic antagonism. Use Caution/Monitor. Individuals with altered immunocompetence may have reduced immune responses to the vaccine.

• mestranol

  Minor (1)cyclophosphamide will increase the level or effect of mestranol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• metaxalone

  Minor (1)cyclophosphamide will increase the level or effect of metaxalone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• methadone

  Minor (1)cyclophosphamide will increase the level or effect of methadone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• methylergonovine

  Minor (1)cyclophosphamide will increase the level or effect of methylergonovine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• methylprednisolone

  Minor (1)cyclophosphamide will increase the level or effect of methylprednisolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• miconazole oral

  Minor (1)cyclophosphamide will increase the level or effect of miconazole oral by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• midazolam

  Minor (1)cyclophosphamide will increase the level or effect of midazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• midazolam intranasal

  Minor (1)cyclophosphamide will increase the level or effect of midazolam intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• midostaurin

  Minor (1)cyclophosphamide will increase the level or effect of midostaurin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mifepristone

  Monitor Closely (2)mifepristone will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.
  
  mifepristone will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of mifepristone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mirtazapine

  Minor (1)cyclophosphamide will increase the level or effect of mirtazapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• mitotane

  Monitor Closely (1)mitotane decreases levels of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Mitotane is a strong inducer of cytochrome P-4503A4; monitor when coadministered with CYP3A4 substrates for possible dosage adjustments.

• modafinil

  Minor (1)cyclophosphamide will increase the level or effect of modafinil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• montelukast

  Minor (1)cyclophosphamide will increase the level or effect of montelukast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• naldemedine

  Minor (1)cyclophosphamide will increase the level or effect of naldemedine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• naloxegol

  Minor (1)cyclophosphamide will increase the level or effect of naloxegol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nefazodone

  Minor (1)cyclophosphamide will increase the level or effect of nefazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nelfinavir

  Monitor Closely (1)nelfinavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of nelfinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• netupitant/palonosetron

  Minor (1)cyclophosphamide will increase the level or effect of netupitant/palonosetron by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nevirapine

  Minor (1)cyclophosphamide will increase the level or effect of nevirapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nicardipine

  Minor (1)cyclophosphamide will increase the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nifedipine

  Minor (1)cyclophosphamide will increase the level or effect of nifedipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nilotinib

  Minor (1)cyclophosphamide will increase the level or effect of nilotinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nimodipine

  Minor (1)cyclophosphamide will increase the level or effect of nimodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nisoldipine

  Minor (1)cyclophosphamide will increase the level or effect of nisoldipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• norethindrone

  Minor (1)cyclophosphamide will increase the level or effect of norethindrone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• norgestrel

  Minor (1)cyclophosphamide will increase the level or effect of norgestrel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ocrelizumab

  Monitor Closely (1)cyclophosphamide and ocrelizumab both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Coadministration of ocrelizumab with immunosuppressants may increase the risk of immunosuppression.

• ofatumumab SC

  Monitor Closely (1)ofatumumab SC, cyclophosphamide. Either increases effects of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Consider the risk of additive immune system effects when coadministering immunosuppressive therapies with coadministration. When switching from therapies with immune effects, take into account the duration and mechanism of action of these therapies when initiating ofatumumab SC.

• olaparib

  Monitor Closely (1)cyclophosphamide and olaparib both increase pharmacodynamic synergism. Use Caution/Monitor. Coadministration with other other myelosuppressive anticancer agents, including DNA damaging agents, may potentiate and prolongate the myelosuppressive toxicity. Minor (1)cyclophosphamide will increase the level or effect of olaparib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ombitasvir/paritaprevir/ritonavir

  Minor (1)cyclophosphamide will increase the level or effect of ombitasvir/paritaprevir/ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC)

  Minor (1)cyclophosphamide will increase the level or effect of ombitasvir/paritaprevir/ritonavir & dasabuvir (DSC) by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• omeprazole

  Minor (1)cyclophosphamide will increase the level or effect of omeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ondansetron

  Minor (1)cyclophosphamide will increase the level or effect of ondansetron by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• osilodrostat

  Minor (1)cyclophosphamide will increase the level or effect of osilodrostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• osimertinib

  Minor (1)cyclophosphamide will increase the level or effect of osimertinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ospemifene

  Minor (1)cyclophosphamide will increase the level or effect of ospemifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• oxycodone

  Minor (1)cyclophosphamide will increase the level or effect of oxycodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• paclitaxel

  Minor (1)cyclophosphamide will increase the level or effect of paclitaxel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• paclitaxel protein bound

  Minor (1)cyclophosphamide will increase the level or effect of paclitaxel protein bound by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• palbociclib

  Minor (1)cyclophosphamide will increase the level or effect of palbociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• palifermin

  Serious - Use Alternative (1)palifermin increases toxicity of cyclophosphamide by Other (see comment). Avoid or Use Alternate Drug. Comment: Palifermin should not be administered within 24 hrbefore, during infusion of, or within 24 hr after administration of antineoplastic agents. Coadministration of palifermin within 24 hr of chemotherapy resulted in increased severity and duration of oral mucositis.

• panobinostat

  Minor (1)cyclophosphamide will increase the level or effect of panobinostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• paricalcitol

  Minor (1)cyclophosphamide will increase the level or effect of paricalcitol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pazopanib

  Minor (1)cyclophosphamide will increase the level or effect of pazopanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pentobarbital

  Monitor Closely (1)pentobarbital will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• perampanel

  Minor (1)cyclophosphamide will increase the level or effect of perampanel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pexidartinib

  Minor (1)cyclophosphamide will increase the level or effect of pexidartinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• phenobarbital

  Monitor Closely (1)phenobarbital will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• pimavanserin

  Minor (1)cyclophosphamide will increase the level or effect of pimavanserin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pimozide

  Minor (1)cyclophosphamide will increase the level or effect of pimozide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pitolisant

  Minor (1)cyclophosphamide will increase the level or effect of pitolisant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• polatuzumab vedotin

  Minor (1)cyclophosphamide will increase the level or effect of polatuzumab vedotin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pomalidomide

  Minor (1)cyclophosphamide will increase the level or effect of pomalidomide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ponatinib

  Minor (1)cyclophosphamide will increase the level or effect of ponatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• praziquantel

  Minor (1)cyclophosphamide will increase the level or effect of praziquantel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• primaquine

  Minor (1)cyclophosphamide will increase the level or effect of primaquine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• primidone

  Monitor Closely (1)primidone will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• progesterone intravaginal gel

  Minor (1)cyclophosphamide will increase the level or effect of progesterone intravaginal gel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone micronized

  Minor (1)cyclophosphamide will increase the level or effect of progesterone micronized by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• progesterone, natural

  Minor (1)cyclophosphamide will increase the level or effect of progesterone, natural by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• quazepam

  Minor (1)cyclophosphamide will increase the level or effect of quazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• quetiapine

  Minor (1)cyclophosphamide will increase the level or effect of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• quinidine

  Minor (1)cyclophosphamide will increase the level or effect of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• quinine

  Minor (1)cyclophosphamide will increase the level or effect of quinine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rabeprazole

  Minor (1)cyclophosphamide will increase the level or effect of rabeprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ranolazine

  Minor (1)cyclophosphamide will increase the level or effect of ranolazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• regorafenib

  Minor (1)cyclophosphamide will increase the level or effect of regorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• repaglinide

  Minor (1)cyclophosphamide will increase the level or effect of repaglinide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ribociclib

  Minor (2)ribociclib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  cyclophosphamide will increase the level or effect of ribociclib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rifabutin

  Minor (1)cyclophosphamide will increase the level or effect of rifabutin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rifampin

  Monitor Closely (2)rifampin will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.
  
  rifampin will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rimegepant

  Minor (1)cyclophosphamide will increase the level or effect of rimegepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• riociguat

  Minor (1)cyclophosphamide will increase the level or effect of riociguat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ritonavir

  Monitor Closely (2)ritonavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ritonavir will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rivaroxaban

  Minor (1)cyclophosphamide will increase the level or effect of rivaroxaban by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• roflumilast

  Minor (1)cyclophosphamide will increase the level or effect of roflumilast by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rolapitant

  Minor (1)cyclophosphamide will increase the level or effect of rolapitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• romidepsin

  Minor (1)cyclophosphamide will increase the level or effect of romidepsin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ropeginterferon alfa 2b

  Serious - Use Alternative (1)ropeginterferon alfa 2b, cyclophosphamide. Either increases toxicity of the other by Other (see comment). Avoid or Use Alternate Drug. Comment: Myelosuppressive agents can produce additive myelosuppression. Avoid use and monitor patients receiving the combination for effects of excessive myelosuppression.

• ropivacaine

  Minor (1)cyclophosphamide will increase the level or effect of ropivacaine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• rucaparib

  Monitor Closely (1)rucaparib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Adjust dosage of CYP3A4 substrates, if clinically indicated.

• ruxolitinib

  Minor (1)cyclophosphamide will increase the level or effect of ruxolitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ruxolitinib topical

  Minor (1)cyclophosphamide will increase the level or effect of ruxolitinib topical by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• salmeterol

  Minor (1)cyclophosphamide will increase the level or effect of salmeterol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• saquinavir

  Monitor Closely (1)saquinavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of saquinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• saxagliptin

  Minor (1)cyclophosphamide will increase the level or effect of saxagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• secobarbital

  Monitor Closely (1)secobarbital will decrease the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.

• selpercatinib

  Minor (1)cyclophosphamide will increase the level or effect of selpercatinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sildenafil

  Minor (1)cyclophosphamide will increase the level or effect of sildenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• simvastatin

  Minor (1)cyclophosphamide will increase the level or effect of simvastatin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• siponimod

  Monitor Closely (1)siponimod and cyclophosphamide both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Caution if coadministered because of additive immunosuppressive effects during such therapy and in the weeks following administration. When switching from drugs with prolonged immune effects, consider the half-life and mode of action of these drugs to avoid unintended additive immunosuppressive effects.Minor (1)cyclophosphamide will increase the level or effect of siponimod by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sipuleucel-T

  Monitor Closely (1)cyclophosphamide decreases effects of sipuleucel-T by pharmacodynamic antagonism. Modify Therapy/Monitor Closely.

• sirolimus

  Minor (1)cyclophosphamide will increase the level or effect of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sodium sulfate/?magnesium sulfate/potassium chloride

  Monitor Closely (1)sodium sulfate/?magnesium sulfate/potassium chloride increases toxicity of cyclophosphamide by Other (see comment). Use Caution/Monitor. Comment: Coadministration with medications that cause fluid and electrolyte abnormalities may increase the risk of adverse events of seizure, arrhythmias, and renal impairment.

• sodium sulfate/potassium sulfate/magnesium sulfate

  Monitor Closely (1)sodium sulfate/potassium sulfate/magnesium sulfate increases toxicity of cyclophosphamide by Other (see comment). Use Caution/Monitor. Comment: Coadministration with medications that cause fluid and electrolyte abnormalities may increase the risk of adverse events of seizure, arrhythmias, and renal impairment.

• sofosbuvir/velpatasvir

  Minor (1)cyclophosphamide will increase the level or effect of sofosbuvir/velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• solifenacin

  Minor (1)cyclophosphamide will increase the level or effect of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sonidegib

  Minor (1)cyclophosphamide will increase the level or effect of sonidegib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sorafenib

  Monitor Closely (1)sorafenib will increase the level or effect of cyclophosphamide by affecting hepatic enzyme CYP2B6 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of sorafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• stiripentol

  Monitor Closely (2)stiripentol, cyclophosphamide. affecting hepatic enzyme CYP2B6 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP2B6 inhibitor and inducer. Monitor CYP2B6 substrates coadministered with stiripentol for increased or decreased effects. CYP2B6 substrates may require dosage adjustment.
  
  stiripentol, cyclophosphamide. affecting hepatic/intestinal enzyme CYP3A4 metabolism. Modify Therapy/Monitor Closely. Stiripentol is a CYP3A4 inhibitor and inducer. Monitor CYP3A4 substrates coadministered with stiripentol for increased or decreased effects. CYP3A4 substrates may require dosage adjustment.Minor (1)cyclophosphamide will increase the level or effect of stiripentol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• streptozocin

  Monitor Closely (1)cyclophosphamide, streptozocin. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• succinylcholine

  Monitor Closely (1)cyclophosphamide increases levels of succinylcholine by decreasing metabolism. Use Caution/Monitor. Neuromuscular blockade may be prolonged because of inhibition of cholinesterase activity. Prolonged respiratory depression with extended periods of apnea may occur. .

• sufentanil

  Minor (1)cyclophosphamide will increase the level or effect of sufentanil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sufentanil SL

  Minor (1)cyclophosphamide will increase the level or effect of sufentanil SL by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• sunitinib

  Minor (1)cyclophosphamide will increase the level or effect of sunitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• suvorexant

  Minor (1)cyclophosphamide will increase the level or effect of suvorexant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tacrolimus

  Minor (1)cyclophosphamide will increase the level or effect of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tacrolimus ointment

  Minor (1)cyclophosphamide will increase the level or effect of tacrolimus ointment by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tadalafil

  Minor (1)cyclophosphamide will increase the level or effect of tadalafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tamoxifen

  Minor (1)cyclophosphamide decreases effects of tamoxifen by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tamsulosin

  Minor (1)cyclophosphamide will increase the level or effect of tamsulosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tasimelteon

  Minor (1)cyclophosphamide will increase the level or effect of tasimelteon by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tazemetostat

  Minor (1)cyclophosphamide will increase the level or effect of tazemetostat by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tecovirimat

  Monitor Closely (1)tecovirimat will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. Tecovirimat is a weak CYP3A4 inducer. Monitor sensitive CYP3A4 substrates for effectiveness if coadministered.

• temsirolimus

  Minor (1)cyclophosphamide will increase the level or effect of temsirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• teniposide

  Minor (1)cyclophosphamide will increase the level or effect of teniposide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tetracycline

  Minor (1)cyclophosphamide will increase the level or effect of tetracycline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tezacaftor

  Minor (1)cyclophosphamide will increase the level or effect of tezacaftor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• theophylline

  Minor (1)cyclophosphamide will increase the level or effect of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• thiotepa

  Monitor Closely (1)cyclophosphamide, thiotepa. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Additive myelosuppression.

• tiagabine

  Minor (1)cyclophosphamide will increase the level or effect of tiagabine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ticagrelor

  Minor (1)cyclophosphamide will increase the level or effect of ticagrelor by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ticlopidine

  Minor (1)cyclophosphamide will increase the level or effect of ticlopidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tinidazole

  Minor (1)cyclophosphamide will increase the level or effect of tinidazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tipranavir

  Monitor Closely (1)tipranavir will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)cyclophosphamide will increase the level or effect of tipranavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tisagenlecleucel

  Serious - Use Alternative (1)cyclophosphamide, tisagenlecleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.

• tofacitinib

  Serious - Use Alternative (1)cyclophosphamide, tofacitinib. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug.Minor (1)cyclophosphamide will increase the level or effect of tofacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tolterodine

  Minor (1)cyclophosphamide will increase the level or effect of tolterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tolvaptan

  Minor (1)cyclophosphamide will increase the level or effect of tolvaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• toremifene

  Minor (1)cyclophosphamide will increase the level or effect of toremifene by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trabectedin

  Minor (1)cyclophosphamide will increase the level or effect of trabectedin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tramadol

  Minor (1)cyclophosphamide will increase the level or effect of tramadol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trastuzumab

  Monitor Closely (1)trastuzumab, cyclophosphamide. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Neutropenia or febrile neutropenia incidence were increased when trastuzumab was coadministered with myelosuppressive chemotherapy. .

• trastuzumab deruxtecan

  Monitor Closely (1)trastuzumab deruxtecan, cyclophosphamide. Either increases toxicity of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Neutropenia or febrile neutropenia incidence were increased when trastuzumab was coadministered with myelosuppressive chemotherapy. .

• trazodone

  Minor (1)cyclophosphamide will increase the level or effect of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• triazolam

  Minor (1)cyclophosphamide will increase the level or effect of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trimethoprim

  Minor (1)cyclophosphamide will increase the level or effect of trimethoprim by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• trimipramine

  Minor (1)cyclophosphamide will increase the level or effect of trimipramine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• tucatinib

  Serious - Use Alternative (1)tucatinib will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Avoid concomitant use of tucatinib with CYP3A substrates, where minimal concentration changes may lead to serious or life-threatening toxicities. If unavoidable, reduce CYP3A substrate dose according to product labeling.

• ublituximab

  Monitor Closely (1)ublituximab and cyclophosphamide both increase immunosuppressive effects; risk of infection. Modify Therapy/Monitor Closely. Owing to potential additive immunosuppressive effects, consider duration of effect and mechanism of action of these therapies if coadministered

• ubrogepant

  Minor (1)cyclophosphamide will increase the level or effect of ubrogepant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ulipristal

  Minor (1)cyclophosphamide will increase the level or effect of ulipristal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• umeclidinium bromide/vilanterol inhaled

  Minor (1)cyclophosphamide will increase the level or effect of umeclidinium bromide/vilanterol inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• upadacitinib

  Minor (1)cyclophosphamide will increase the level or effect of upadacitinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• valbenazine

  Minor (1)cyclophosphamide will increase the level or effect of valbenazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vandetanib

  Minor (1)cyclophosphamide will increase the level or effect of vandetanib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vardenafil

  Minor (1)cyclophosphamide will increase the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• velpatasvir

  Minor (1)cyclophosphamide will increase the level or effect of velpatasvir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vemurafenib

  Minor (1)cyclophosphamide will increase the level or effect of vemurafenib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• venetoclax

  Minor (1)cyclophosphamide will increase the level or effect of venetoclax by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• venlafaxine

  Minor (1)cyclophosphamide will increase the level or effect of venlafaxine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• verapamil

  Minor (1)cyclophosphamide will increase the level or effect of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vilanterol/fluticasone furoate inhaled

  Minor (1)cyclophosphamide will increase the level or effect of vilanterol/fluticasone furoate inhaled by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vilazodone

  Minor (1)cyclophosphamide will increase the level or effect of vilazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vinblastine

  Minor (1)cyclophosphamide will increase the level or effect of vinblastine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vincristine

  Minor (1)cyclophosphamide will increase the level or effect of vincristine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vincristine liposomal

  Minor (1)cyclophosphamide will increase the level or effect of vincristine liposomal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vinorelbine

  Minor (1)cyclophosphamide will increase the level or effect of vinorelbine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• voclosporin

  Monitor Closely (1)voclosporin, cyclophosphamide. Either increases toxicity of the other by nephrotoxicity and/or ototoxicity. Modify Therapy/Monitor Closely. Coadministration with drugs associated with nephrotoxicity may increase the risk for acute and/or chronic nephrotoxicity.

• vorapaxar

  Minor (1)cyclophosphamide will increase the level or effect of vorapaxar by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• voriconazole

  Minor (1)cyclophosphamide will increase the level or effect of voriconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• vortioxetine

  Minor (1)cyclophosphamide will increase the level or effect of vortioxetine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• voxelotor

  Serious - Use Alternative (1)voxelotor will increase the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug. Voxelotor increases systemic exposure of sensitive CYP3A4 substrates. Avoid coadministration with sensitive CYP3A4 substrates with a narrow therapeutic index. Consider dose reduction of the sensitive CYP3A4 substrate(s) if unable to avoid.

• voxilaprevir

  Minor (1)cyclophosphamide will increase the level or effect of voxilaprevir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• warfarin

  Minor (1)warfarin will decrease the level or effect of cyclophosphamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• zanubrutinib

  Minor (1)cyclophosphamide will increase the level or effect of zanubrutinib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• zolpidem

  Minor (1)cyclophosphamide will increase the level or effect of zolpidem by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• zonisamide

  Minor (1)cyclophosphamide will increase the level or effect of zonisamide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.