fludrocortisone (Rx)

Adrenocortical Insufficiency/Addison Disease

Primary and secondary adrenocortical insufficiency in Addison disease

Usual, 0.1 mg/day PO; range, 0.1 mg PO 3 times weekly to 0.2 mg/day PO

If hypertension occurs: 0.05 mg/day PO

Salt-Losing Forms of Congenital Adrenogenital Syndrome

0.1-0.2 mg/day PO

Severe Orthostatic Hypotension (Off-label)

0.1 mg/day PO in combination with high salt diet and adequate fluid intake; may be increased in increments of 0.1 mg/wk; not to exceed 1 mg/day

Dosages >0.3 mg/day have not been shown to be beneficial and predispose patient to adverse effects

Not FDA-approved for use in children

Adrenocortical Insufficiency/Addison Disease (Off-label)

0.05-0.1 mg/day PO in single daily dose or divided q12hr in combination with sodium chloride supplementation

Congenital Adrenal Hyperplasia (Off-label)

0.05-0.3 mg/day PO

Contraindicated (1)

• mifepristone

  mifepristone, fludrocortisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

Serious - Use Alternative (69)

• aldesleukin

  fludrocortisone decreases effects of aldesleukin by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Avoid combination because corticosteroids can potentially diminish the antineoplastic effects of aldesleukin.

• anthrax vaccine

  fludrocortisone decreases effects of anthrax vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• axicabtagene ciloleucel

  fludrocortisone, axicabtagene ciloleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Consider the use of prophylactic corticosteroid in patients after weighing the potential benefits and risks. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• BCG vaccine live

  fludrocortisone decreases effects of BCG vaccine live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• brexucabtagene autoleucel

  fludrocortisone, brexucabtagene autoleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• carbamazepine

  carbamazepine will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ciltacabtagene autoleucel

  fludrocortisone, ciltacabtagene autoleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• cimetidine

  cimetidine will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• clarithromycin

  clarithromycin will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• dihydroergotamine

  fludrocortisone will decrease the level or effect of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• dihydroergotamine intranasal

  fludrocortisone will decrease the level or effect of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• diphtheria & tetanus toxoids

  fludrocortisone decreases effects of diphtheria & tetanus toxoids by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• diphtheria & tetanus toxoids/ acellular pertussis vaccine

  fludrocortisone decreases effects of diphtheria & tetanus toxoids/ acellular pertussis vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• diphtheria & tetanus toxoids/acellular pertussis/poliovirus, inactivated vaccine

  fludrocortisone decreases effects of diphtheria & tetanus toxoids/acellular pertussis/poliovirus, inactivated vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• dronedarone

  fludrocortisone will decrease the level or effect of dronedarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• ergotamine

  fludrocortisone will decrease the level or effect of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin base

  erythromycin base will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fludrocortisone will decrease the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  erythromycin ethylsuccinate will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fludrocortisone will decrease the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  erythromycin lactobionate will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fludrocortisone will decrease the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin stearate

  erythromycin stearate will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fludrocortisone will decrease the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• hepatitis A vaccine inactivated

  fludrocortisone decreases effects of hepatitis A vaccine inactivated by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• hepatitis a/b vaccine

  fludrocortisone decreases effects of hepatitis a/b vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• hepatitis a/typhoid vaccine

  fludrocortisone decreases effects of hepatitis a/typhoid vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• hepatitis b vaccine

  fludrocortisone decreases effects of hepatitis b vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• human papillomavirus vaccine, nonavalent

  fludrocortisone decreases effects of human papillomavirus vaccine, nonavalent by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs, and corticosteroids (used in greater than physiologic doses), may reduce the immune responses to vaccines.

• human papillomavirus vaccine, quadrivalent

  fludrocortisone decreases effects of human papillomavirus vaccine, quadrivalent by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs, and corticosteroids (used in greater than physiologic doses), may reduce the immune responses to vaccines.

• idecabtagene vicleucel

  fludrocortisone, idecabtagene vicleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• influenza virus vaccine quadrivalent

  fludrocortisone decreases effects of influenza virus vaccine quadrivalent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• influenza virus vaccine quadrivalent, adjuvanted

  fludrocortisone 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 quadrivalent, cell-cultured

  fludrocortisone decreases effects of influenza virus vaccine quadrivalent, cell-cultured by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• influenza virus vaccine quadrivalent, intranasal

  fludrocortisone decreases effects of influenza virus vaccine quadrivalent, intranasal by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• influenza virus vaccine trivalent

  fludrocortisone decreases effects of influenza virus vaccine trivalent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• influenza virus vaccine trivalent, adjuvanted

  fludrocortisone 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.

• Japanese encephalitis virus vaccine

  fludrocortisone decreases effects of Japanese encephalitis virus vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• lisocabtagene maraleucel

  fludrocortisone, lisocabtagene maraleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• macimorelin

  fludrocortisone, macimorelin. unspecified interaction mechanism. Avoid or Use Alternate Drug. Drugs that directly affect the pituitary secretion of growth hormone (GH) may impact the accuracy of the macimorelin diagnostic test. Allow sufficient washout time of drugs affecting GH release before administering macimorelin. .

• measles (rubeola) vaccine

  fludrocortisone decreases effects of measles (rubeola) vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• measles mumps and rubella vaccine, live

  fludrocortisone decreases effects of measles mumps and rubella vaccine, live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• measles, mumps, rubella and varicella vaccine, live

  fludrocortisone decreases effects of measles, mumps, rubella and varicella vaccine, live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• meningococcal A C Y and W-135 polysaccharide vaccine combined

  fludrocortisone decreases effects of meningococcal A C Y and W-135 polysaccharide vaccine combined by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• nefazodone

  nefazodone will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• pneumococcal vaccine 13-valent

  fludrocortisone decreases effects of pneumococcal vaccine 13-valent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• pneumococcal vaccine heptavalent

  fludrocortisone decreases effects of pneumococcal vaccine heptavalent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• pneumococcal vaccine polyvalent

  fludrocortisone decreases effects of pneumococcal vaccine polyvalent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• quinidine

  quinidine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug.

• rabies vaccine

  fludrocortisone decreases effects of rabies vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids may interfere with development of active immunity.

• rabies vaccine chick embryo cell derived

  fludrocortisone decreases effects of rabies vaccine chick embryo cell derived by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• ranolazine

  fludrocortisone will decrease the level or effect of ranolazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rifabutin

  rifabutin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rifampin

  rifampin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rotavirus oral vaccine, live

  fludrocortisone decreases effects of rotavirus oral vaccine, live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• rubella vaccine

  fludrocortisone decreases effects of rubella vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• silodosin

  fludrocortisone will decrease the level or effect of silodosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• sirolimus

  fludrocortisone will decrease the level or effect of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• smallpox (vaccinia) vaccine, live

  fludrocortisone decreases effects of smallpox (vaccinia) vaccine, live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• squill

  fludrocortisone increases toxicity of squill by unspecified interaction mechanism. Avoid or Use Alternate Drug.

• St John's Wort

  St John's Wort will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• testosterone intranasal

  testosterone intranasal, fludrocortisone. Either increases effects of the other by Other (see comment). Avoid or Use Alternate Drug. Comment: Coadministration increases risk for edema, particularly in patients with cardiac, renal, or hepatic disease.

• tetanus toxoid adsorbed or fluid

  fludrocortisone decreases effects of tetanus toxoid adsorbed or fluid by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• tick-borne encephalitis vaccine

  fludrocortisone decreases effects of tick-borne encephalitis vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• tisagenlecleucel

  fludrocortisone, tisagenlecleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• tofacitinib

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

• tolvaptan

  fludrocortisone will decrease the level or effect of tolvaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• travelers diarrhea and cholera vaccine inactivated

  fludrocortisone decreases effects of travelers diarrhea and cholera vaccine inactivated by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• typhoid polysaccharide vaccine

  fludrocortisone decreases effects of typhoid polysaccharide vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• typhoid vaccine live

  fludrocortisone decreases effects of typhoid vaccine live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• varicella virus vaccine live

  fludrocortisone decreases effects of varicella virus vaccine live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• yellow fever vaccine

  fludrocortisone decreases effects of yellow fever vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• zoster vaccine live

  fludrocortisone decreases effects of zoster vaccine live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

Monitor Closely (216)

• aceclofenac

  aceclofenac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• acemetacin

  acemetacin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• albiglutide

  fludrocortisone decreases effects of albiglutide by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids may diminish hypoglycemic effect of antidiabetic agents. Monitor blood glucose levels carefully. .

• almotriptan

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

• alprazolam

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

• amiodarone

  fludrocortisone will decrease the level or effect of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  amiodarone will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• amobarbital

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

• antithrombin alfa

  fludrocortisone, antithrombin alfa. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• antithrombin III

  fludrocortisone, antithrombin III. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• aprepitant

  aprepitant will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• argatroban

  fludrocortisone, argatroban. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• aripiprazole

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

• armodafinil

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

• artemether/lumefantrine

  artemether/lumefantrine will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of artemether/lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• aspirin

  aspirin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• aspirin rectal

  aspirin rectal, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• aspirin/citric acid/sodium bicarbonate

  aspirin/citric acid/sodium bicarbonate, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• atazanavir

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

• atorvastatin

  atorvastatin will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• atracurium

  atracurium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• bazedoxifene/conjugated estrogens

  fludrocortisone will decrease the level or effect of bazedoxifene/conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• bemiparin

  fludrocortisone, bemiparin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• bivalirudin

  fludrocortisone, bivalirudin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• bosentan

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

• budesonide

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

• buspirone

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

• butabarbital

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

• butalbital

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

• carbamazepine

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

• celecoxib

  celecoxib, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• cholera vaccine

  fludrocortisone 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.

• cholestyramine

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

• choline magnesium trisalicylate

  choline magnesium trisalicylate, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• cilostazol

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

• cinacalcet

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

• ciprofloxacin

  fludrocortisone and ciprofloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• cisatracurium

  cisatracurium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• clarithromycin

  clarithromycin will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• clopidogrel

  fludrocortisone will increase the level or effect of clopidogrel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers may increase the metabolism of clopidogrel to its active metabolite. Monitor patients for potential increase in antiplatelet effects when CYP3A4 inducers are used in combination with clopidogrel

• clotrimazole

  clotrimazole will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• clozapine

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

• colchicine

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

• conivaptan

  conivaptan will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• conjugated estrogens

  fludrocortisone will decrease the level or effect of conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• conjugated estrogens, vaginal

  fludrocortisone will decrease the level or effect of conjugated estrogens, vaginal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• cortisone

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

• cyclosporine

  cyclosporine will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  cyclosporine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.
  
  fludrocortisone, cyclosporine. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may increase or decrease cyclosporine concentrations. Also, cyclosporine may increase the plasma concentrations of the corticosteroids. Monitor for changes in cyclosporine concentrations and for toxicities of corticosteroids and/or cyclosporine.

• dalteparin

  fludrocortisone, dalteparin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• darifenacin

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

• darunavir

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

• dasatinib

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

• deferasirox

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

• dengue vaccine

  fludrocortisone 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

  fludrocortisone, 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

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

• DHEA, herbal

  DHEA, herbal will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• diazepam

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

• dichlorphenamide

  dichlorphenamide and fludrocortisone both decrease serum potassium. Use Caution/Monitor.

• diclofenac

  diclofenac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• diflunisal

  diflunisal, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• diltiazem

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

• dronedarone

  dronedarone will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  dronedarone will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• efavirenz

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

• eletriptan

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

• enoxaparin

  fludrocortisone, enoxaparin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• erythromycin base

  erythromycin base will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• erythromycin ethylsuccinate

  erythromycin ethylsuccinate will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• erythromycin lactobionate

  erythromycin lactobionate will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• erythromycin stearate

  erythromycin stearate will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• estradiol

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

• estrogens conjugated synthetic

  fludrocortisone will decrease the level or effect of estrogens conjugated synthetic by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estropipate

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

• etodolac

  etodolac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• etravirine

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

• exenatide injectable solution

  fludrocortisone decreases effects of exenatide injectable solution by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids may diminish hypoglycemic effect of antidiabetic agents. Monitor blood glucose levels carefully. .

• exenatide injectable suspension

  fludrocortisone decreases effects of exenatide injectable suspension by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids may diminish hypoglycemic effect of antidiabetic agents. Monitor blood glucose levels carefully.

• felodipine

  fludrocortisone will decrease the level or effect of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  felodipine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• fenoprofen

  fenoprofen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• fesoterodine

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

• fingolimod

  fludrocortisone 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. .

• fluconazole

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

• flurbiprofen

  flurbiprofen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• fondaparinux

  fludrocortisone, fondaparinux. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• fosamprenavir

  fosamprenavir will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of fosamprenavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fosaprepitant

  fosaprepitant will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of fosaprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fosphenytoin

  fosphenytoin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fosphenytoin will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• gemifloxacin

  fludrocortisone and gemifloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• glycerol phenylbutyrate

  fludrocortisone decreases effects of glycerol phenylbutyrate by Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may cause the breakdown of body protein and increase plasma ammonia levels; monitor ammonia levels closely when glycerol phenylbutyrate is coadministered with corticosteroids.

• grapefruit

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

• griseofulvin

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

• haemophilus influenzae type b vaccine

  fludrocortisone decreases effects of haemophilus influenzae type b vaccine by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Avoid vaccination during chemotherapy or radiation therapy if possible because antibody response might be suboptimal. Patients vaccinated within a 14-day period before starting or during immunosuppressive therapy should be revaccinated =3 months after therapy is discontinued if immune competence has been restored.

• hemin

  fludrocortisone decreases effects of hemin by pharmacodynamic antagonism. Use Caution/Monitor. Drugs that increase delta-aminolevulinic acid synthetase may decrease hemin effect.

• heparin

  fludrocortisone, heparin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• hydrocortisone

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

• hydroxyprogesterone caproate

  fludrocortisone will decrease the level or effect of hydroxyprogesterone caproate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ibuprofen

  ibuprofen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• ibuprofen IV

  ibuprofen IV, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• iloperidone

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

• indinavir

  indinavir will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  indinavir will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• indomethacin

  indomethacin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• influenza A (H5N1) vaccine

  fludrocortisone decreases effects of influenza A (H5N1) vaccine by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids used in greater than physiologic doses may reduce immune response to H5N1 vaccine.

• influenza virus vaccine (H5N1), adjuvanted

  fludrocortisone decreases effects of influenza virus vaccine (H5N1), adjuvanted by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids used in greater than physiologic doses may reduce immune response to H5N1 vaccine.

• influenza virus vaccine quadrivalent, recombinant

  fludrocortisone decreases effects of influenza virus vaccine quadrivalent, recombinant by pharmacodynamic antagonism. Use Caution/Monitor. Immune response to vaccine may be decreased in immunocompromised individuals.

• influenza virus vaccine trivalent, recombinant

  fludrocortisone decreases effects of influenza virus vaccine trivalent, recombinant by pharmacodynamic antagonism. Use Caution/Monitor. Immune response to vaccine may be decreased in immunocompromised individuals.

• insulin degludec

  fludrocortisone decreases effects of insulin degludec by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Endogneous cortisol is a regulatory hormone that increases blood glucose levels; exogenous systemic corticosteroids have been associated with hyperglycemia and may cause diabetes with chronic, high dose use; dose of antidiabetic agents may need adjustment and increased frequency of glucose monitoring may be required.

• insulin degludec/insulin aspart

  fludrocortisone decreases effects of insulin degludec/insulin aspart by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Endogneous cortisol is a regulatory hormone that increases blood glucose levels; exogenous systemic corticosteroids have been associated with hyperglycemia and may cause diabetes with chronic, high dose use; dose of antidiabetic agents may need adjustment and increased frequency of glucose monitoring may be required.

• insulin inhaled

  fludrocortisone decreases effects of insulin inhaled by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Endogneous cortisol is a regulatory hormone that increases blood glucose levels; exogenous systemic corticosteroids have been associated with hyperglycemia and may cause diabetes with chronic, high dose use; dose of antidiabetic agents may need adjustment and increased frequency of glucose monitoring may be required.

• isavuconazonium sulfate

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

• isoniazid

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

• itraconazole

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

• ketoconazole

  ketoconazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ketoconazole will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• ketoprofen

  ketoprofen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• ketorolac

  ketorolac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• ketorolac intranasal

  ketorolac intranasal, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• lapatinib

  lapatinib will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  lapatinib will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• levofloxacin

  fludrocortisone and levofloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• levoketoconazole

  levoketoconazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  levoketoconazole will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• liraglutide

  fludrocortisone decreases effects of liraglutide by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids may diminish hypoglycemic effect of antidiabetic agents. Monitor blood glucose levels carefully. .

• lonapegsomatropin

  lonapegsomatropin decreases effects of fludrocortisone by Other (see comment). Use Caution/Monitor. Comment: Growth hormone (GH) inhibits microsomal enzyme 11 beta-hydroxysteroid dehydrogenase type 1, which converts cortisone to its active metabolite, cortisol. Patients with untreated GH deficiency may have increases in serum cortisol, and initiation of lonapegsomatropin may result decreased serum cortisol. Patients with hypoadrenalism treated with glucocorticoids may require an increase glucocorticoid stress or maintenance doses following lonapegsomatropin initiation.
  
  fludrocortisone decreases effects of lonapegsomatropin by Other (see comment). Use Caution/Monitor. Comment: Glucocorticoid therapy and supraphysiologic glucocorticoid treatment may attenuate the growth promoting effects of lonapegsomatropin in children. Carefully adjust glucocorticoid replacement dosing in children receiving glucocorticoid treatments to avoid both hypoadrenalism and an inhibitory effect on growth.

• lopinavir

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

• loratadine

  fludrocortisone will decrease the level or effect of loratadine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  loratadine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• lornoxicam

  lornoxicam, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• lumefantrine

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

• maraviroc

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

• marijuana

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

• meclofenamate

  meclofenamate, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• mefenamic acid

  mefenamic acid, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• meloxicam

  meloxicam, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• mestranol

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

• methadone

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

• methylprednisolone

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

• metronidazole

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

• miconazole vaginal

  miconazole vaginal will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• midazolam

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

• moxifloxacin

  fludrocortisone and moxifloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• nabumetone

  nabumetone, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• naproxen

  naproxen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• nefazodone

  nefazodone will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• nelfinavir

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

• nevirapine

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

• nicardipine

  fludrocortisone will decrease the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  nicardipine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• nifedipine

  nifedipine will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  nifedipine will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• nilotinib

  nilotinib will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  nilotinib will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• nisoldipine

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

• ocrelizumab

  fludrocortisone and ocrelizumab both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Coadministration of ocrelizumab with high doses of corticosteroids is expected to increase the risk of immunosuppression.

• ofatumumab SC

  ofatumumab SC, fludrocortisone. 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.

• ofloxacin

  fludrocortisone and ofloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• olodaterol inhaled

  fludrocortisone and olodaterol inhaled both decrease serum potassium. Use Caution/Monitor.

• oxaprozin

  oxaprozin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• oxcarbazepine

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

• ozanimod

  ozanimod, fludrocortisone. Either increases effects of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Coadministration with immunosuppressive therapies may increase the risk of additive immune effects during 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 in order to avoid unintended additive immunosuppressive effects.

• pancuronium

  pancuronium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• parecoxib

  parecoxib, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• pentobarbital

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

• phenindione

  fludrocortisone, phenindione. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• phenobarbital

  phenobarbital will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  phenobarbital will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• phenytoin

  phenytoin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  phenytoin will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• piroxicam

  piroxicam, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• poliovirus vaccine inactivated

  fludrocortisone decreases effects of poliovirus vaccine inactivated by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Avoid vaccination during chemotherapy or radiation therapy if possible because antibody response might be suboptimal. Patients vaccinated within a 14-day period before starting or during immunosuppressive therapy should be revaccinated =3 months after therapy is discontinued if immune competence has been restored. .

• ponesimod

  ponesimod and fludrocortisone 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.

• posaconazole

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

• prednisone

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

• primidone

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

• protamine

  fludrocortisone, protamine. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• quercetin

  quercetin will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• quetiapine

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

• quinidine

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

• quinupristin/dalfopristin

  quinupristin/dalfopristin will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ranolazine

  ranolazine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• repaglinide

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

• rifampin

  rifampin will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rifapentine

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

• ritonavir

  ritonavir will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ritonavir will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rocuronium

  rocuronium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• rufinamide

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

• salicylates (non-asa)

  salicylates (non-asa), fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• salsalate

  salsalate, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• saquinavir

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

• secobarbital

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

• simvastatin

  simvastatin will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• sipuleucel-T

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

• sirolimus

  sirolimus will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• sodium picosulfate/magnesium oxide/anhydrous citric acid

  fludrocortisone, sodium picosulfate/magnesium oxide/anhydrous citric acid. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May be associated with fluid and electrolyte imbalances such as hypokalemia.

• sodium sulfate/?magnesium sulfate/potassium chloride

  sodium sulfate/?magnesium sulfate/potassium chloride increases toxicity of fludrocortisone 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 fludrocortisone 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/polyethylene glycol

  fludrocortisone and sodium sulfate/potassium sulfate/magnesium sulfate/polyethylene glycol both decrease serum potassium. Modify Therapy/Monitor Closely.

• solifenacin

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

• somapacitan

  somapacitan decreases effects of fludrocortisone by Other (see comment). Modify Therapy/Monitor Closely. Comment: Microsomal enzyme 11-beta-hydroxysteroid dehydrogenase type 1 (11-beta-HSD-1) required for cortisone conversion to its active metabolite, cortisol, in hepatic and adipose tissue. GH inhibits 11-beta-HSD-1. Patients treated with glucocorticoid for hypoadrenalism may require increased maintenance or stress doses after initiating somapacitan.

• somatrem

  fludrocortisone decreases effects of somatrem by pharmacodynamic antagonism. Use Caution/Monitor.

• sorafenib

  fludrocortisone decreases levels of sorafenib by increasing metabolism. Use Caution/Monitor.

• St John's Wort

  St John's Wort will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• succinylcholine

  succinylcholine, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• sulfasalazine

  sulfasalazine, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• sulindac

  sulindac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• tacrolimus

  fludrocortisone will decrease the level or effect of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  tacrolimus will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• theophylline

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

• tipranavir

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

• tolfenamic acid

  tolfenamic acid, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• tolmetin

  tolmetin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• tolterodine

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

• tolvaptan

  tolvaptan will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• topiramate

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

• trastuzumab

  trastuzumab, fludrocortisone. 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, fludrocortisone. 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

  fludrocortisone will decrease the level or effect of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  trazodone will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• triamcinolone acetonide injectable suspension

  fludrocortisone will decrease the level or effect of triamcinolone acetonide injectable suspension by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• triazolam

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

• ublituximab

  ublituximab and fludrocortisone 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

• vardenafil

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

• vecuronium

  vecuronium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• verapamil

  verapamil will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  verapamil will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• voriconazole

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

• warfarin

  fludrocortisone increases effects of warfarin by unspecified interaction mechanism. Use Caution/Monitor.

• xipamide

  xipamide, fludrocortisone. pharmacodynamic synergism. Use Caution/Monitor. Risk of hypokalemia.

• zafirlukast

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

• zoster vaccine recombinant

  fludrocortisone decreases effects of zoster vaccine recombinant by pharmacodynamic antagonism. Use Caution/Monitor. Immunosuppressive therapies may reduce the effectiveness of zoster vaccine recombinant.

Minor (109)

• acarbose

  fludrocortisone decreases effects of acarbose by pharmacodynamic antagonism. Minor/Significance Unknown.

• alfentanil

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

• alfuzosin

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

• alosetron

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

• amitriptyline

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

• amphotericin B deoxycholate

  amphotericin B deoxycholate, fludrocortisone. Mechanism: unspecified interaction mechanism. Minor/Significance Unknown. Potential for hypokalemia.

• armodafinil

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

• aspirin

  fludrocortisone decreases levels of aspirin by increasing renal clearance. Minor/Significance Unknown.

• aspirin rectal

  fludrocortisone decreases levels of aspirin rectal by increasing renal clearance. Minor/Significance Unknown.

• aspirin/citric acid/sodium bicarbonate

  fludrocortisone decreases levels of aspirin/citric acid/sodium bicarbonate by increasing renal clearance. Minor/Significance Unknown.

• atazanavir

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

• balsalazide

  fludrocortisone decreases levels of balsalazide by increasing renal clearance. Minor/Significance Unknown.

• bendroflumethiazide

  fludrocortisone, bendroflumethiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• bosentan

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

• bumetanide

  fludrocortisone, bumetanide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• calcium acetate

  fludrocortisone decreases levels of calcium acetate by increasing elimination. Minor/Significance Unknown.

• calcium carbonate

  fludrocortisone decreases levels of calcium carbonate by increasing elimination. Minor/Significance Unknown.

• calcium chloride

  fludrocortisone decreases levels of calcium chloride by increasing elimination. Minor/Significance Unknown.

• calcium citrate

  fludrocortisone decreases levels of calcium citrate by increasing elimination. Minor/Significance Unknown.

• calcium gluconate

  fludrocortisone decreases levels of calcium gluconate by increasing elimination. Minor/Significance Unknown.

• cevimeline

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

• chlorothiazide

  fludrocortisone, chlorothiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• chlorpropamide

  fludrocortisone decreases effects of chlorpropamide by pharmacodynamic antagonism. Minor/Significance Unknown.

• chlorthalidone

  fludrocortisone, chlorthalidone. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• choline magnesium trisalicylate

  fludrocortisone decreases levels of choline magnesium trisalicylate by increasing renal clearance. Minor/Significance Unknown.

• chromium

  fludrocortisone decreases levels of chromium by increasing renal clearance. Minor/Significance Unknown.

• clarithromycin

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

• clomipramine

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

• colestipol

  colestipol decreases levels of fludrocortisone by inhibition of GI absorption. Applies only to oral form of both agents. Minor/Significance Unknown.

• cyclopenthiazide

  fludrocortisone, cyclopenthiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• danazol

  danazol, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• dapsone

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

• desipramine

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

• diflunisal

  fludrocortisone decreases levels of diflunisal by increasing renal clearance. Minor/Significance Unknown.

• disopyramide

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

• donepezil

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

• dutasteride

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

• efavirenz

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

• eplerenone

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

• ethacrynic acid

  fludrocortisone, ethacrynic acid. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• eucalyptus

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

• feverfew

  fludrocortisone decreases effects of feverfew by pharmacodynamic antagonism. Minor/Significance Unknown.

• finasteride

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

• fluoxymesterone

  fluoxymesterone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• furosemide

  fludrocortisone, furosemide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• galantamine

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

• glimepiride

  fludrocortisone decreases effects of glimepiride by pharmacodynamic antagonism. Minor/Significance Unknown.

• glipizide

  fludrocortisone decreases effects of glipizide by pharmacodynamic antagonism. Minor/Significance Unknown.

• glyburide

  fludrocortisone decreases effects of glyburide by pharmacodynamic antagonism. Minor/Significance Unknown.

• hydrochlorothiazide

  fludrocortisone, hydrochlorothiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• imipramine

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

• indapamide

  fludrocortisone, indapamide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• insulin aspart

  fludrocortisone decreases effects of insulin aspart by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin detemir

  fludrocortisone decreases effects of insulin detemir by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin glargine

  fludrocortisone decreases effects of insulin glargine by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin glulisine

  fludrocortisone decreases effects of insulin glulisine by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin lispro

  fludrocortisone decreases effects of insulin lispro by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin NPH

  fludrocortisone decreases effects of insulin NPH by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin regular human

  fludrocortisone decreases effects of insulin regular human by pharmacodynamic antagonism. Minor/Significance Unknown.

• isoniazid

  fludrocortisone decreases effects of isoniazid by unknown mechanism. Minor/Significance Unknown.

• isradipine

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

• ketoconazole

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

• levoketoconazole

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

• mesalamine

  fludrocortisone decreases levels of mesalamine by increasing renal clearance. Minor/Significance Unknown.

• mesterolone

  mesterolone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• metformin

  fludrocortisone decreases effects of metformin by pharmacodynamic antagonism. Minor/Significance Unknown.

• methyclothiazide

  fludrocortisone, methyclothiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• methyltestosterone

  methyltestosterone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• metolazone

  fludrocortisone, metolazone. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• metyrapone

  fludrocortisone decreases effects of metyrapone by unspecified interaction mechanism. Minor/Significance Unknown.

• miglitol

  fludrocortisone decreases effects of miglitol by pharmacodynamic antagonism. Minor/Significance Unknown.

• montelukast

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

• nateglinide

  fludrocortisone decreases effects of nateglinide by pharmacodynamic antagonism. Minor/Significance Unknown.

• nifedipine

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

• nimodipine

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

• nitrendipine

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

• oxandrolone

  oxandrolone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• oxybutynin

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

• oxymetholone

  oxymetholone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• paclitaxel

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

• paclitaxel protein bound

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

• parecoxib

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

• pimozide

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

• pioglitazone

  fludrocortisone will decrease the level or effect of pioglitazone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  fludrocortisone decreases effects of pioglitazone by pharmacodynamic antagonism. Minor/Significance Unknown.

• propafenone

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

• quinine

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

• repaglinide

  fludrocortisone decreases effects of repaglinide by pharmacodynamic antagonism. Minor/Significance Unknown.

• rosiglitazone

  fludrocortisone decreases effects of rosiglitazone by pharmacodynamic antagonism. Minor/Significance Unknown.

• salicylates (non-asa)

  fludrocortisone decreases levels of salicylates (non-asa) by increasing renal clearance. Minor/Significance Unknown.

• salsalate

  fludrocortisone decreases levels of salsalate by increasing renal clearance. Minor/Significance Unknown.

• sargramostim

  fludrocortisone increases effects of sargramostim by pharmacodynamic synergism. Minor/Significance Unknown.

• saxagliptin

  fludrocortisone will decrease the level or effect of saxagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  fludrocortisone decreases effects of saxagliptin by pharmacodynamic antagonism. Minor/Significance Unknown.

• sitagliptin

  fludrocortisone decreases effects of sitagliptin by pharmacodynamic antagonism. Minor/Significance Unknown.

• somatropin

  fludrocortisone decreases effects of somatropin by pharmacodynamic antagonism. Minor/Significance Unknown.

• sufentanil

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

• sulfasalazine

  fludrocortisone decreases levels of sulfasalazine by increasing renal clearance. Minor/Significance Unknown.

• tacrolimus

  fludrocortisone, tacrolimus. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown.

• testosterone

  testosterone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• testosterone buccal system

  testosterone buccal system, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• testosterone topical

  testosterone topical, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• tolazamide

  fludrocortisone decreases effects of tolazamide by pharmacodynamic antagonism. Minor/Significance Unknown.

• tolbutamide

  fludrocortisone decreases effects of tolbutamide by pharmacodynamic antagonism. Minor/Significance Unknown.

• torsemide

  fludrocortisone, torsemide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• vasopressin

  fludrocortisone increases effects of vasopressin by pharmacodynamic synergism. Minor/Significance Unknown.

• vildagliptin

  fludrocortisone decreases effects of vildagliptin by pharmacodynamic antagonism. Minor/Significance Unknown.

• vincristine liposomal

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

• willow bark

  fludrocortisone decreases levels of willow bark by increasing renal clearance. Minor/Significance Unknown.

• ziprasidone

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

• zonisamide

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

• acarbose

  Minor (1)fludrocortisone decreases effects of acarbose by pharmacodynamic antagonism. Minor/Significance Unknown.

• aceclofenac

  Monitor Closely (1)aceclofenac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• acemetacin

  Monitor Closely (1)acemetacin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• albiglutide

  Monitor Closely (1)fludrocortisone decreases effects of albiglutide by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids may diminish hypoglycemic effect of antidiabetic agents. Monitor blood glucose levels carefully. .

• aldesleukin

  Serious - Use Alternative (1)fludrocortisone decreases effects of aldesleukin by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Avoid combination because corticosteroids can potentially diminish the antineoplastic effects of aldesleukin.

• alfentanil

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

• alfuzosin

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

• almotriptan

  Monitor Closely (1)fludrocortisone will decrease the level or effect of almotriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• alosetron

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

• alprazolam

  Monitor Closely (1)fludrocortisone will decrease the level or effect of alprazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• amiodarone

  Monitor Closely (2)fludrocortisone will decrease the level or effect of amiodarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  amiodarone will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• amitriptyline

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

• amobarbital

  Monitor Closely (1)amobarbital will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• amphotericin B deoxycholate

  Minor (1)amphotericin B deoxycholate, fludrocortisone. Mechanism: unspecified interaction mechanism. Minor/Significance Unknown. Potential for hypokalemia.

• anthrax vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of anthrax vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• antithrombin alfa

  Monitor Closely (1)fludrocortisone, antithrombin alfa. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• antithrombin III

  Monitor Closely (1)fludrocortisone, antithrombin III. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• aprepitant

  Monitor Closely (2)aprepitant will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of aprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• argatroban

  Monitor Closely (1)fludrocortisone, argatroban. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• aripiprazole

  Monitor Closely (1)fludrocortisone will decrease the level or effect of aripiprazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• armodafinil

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

• artemether/lumefantrine

  Monitor Closely (2)artemether/lumefantrine will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of artemether/lumefantrine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• aspirin

  Monitor Closely (1)aspirin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone decreases levels of aspirin by increasing renal clearance. Minor/Significance Unknown.

• aspirin rectal

  Monitor Closely (1)aspirin rectal, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone decreases levels of aspirin rectal by increasing renal clearance. Minor/Significance Unknown.

• aspirin/citric acid/sodium bicarbonate

  Monitor Closely (1)aspirin/citric acid/sodium bicarbonate, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone decreases levels of aspirin/citric acid/sodium bicarbonate by increasing renal clearance. Minor/Significance Unknown.

• atazanavir

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

• atorvastatin

  Monitor Closely (1)atorvastatin will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• atracurium

  Monitor Closely (1)atracurium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• axicabtagene ciloleucel

  Serious - Use Alternative (1)fludrocortisone, axicabtagene ciloleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Consider the use of prophylactic corticosteroid in patients after weighing the potential benefits and risks. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• balsalazide

  Minor (1)fludrocortisone decreases levels of balsalazide by increasing renal clearance. Minor/Significance Unknown.

• bazedoxifene/conjugated estrogens

  Monitor Closely (1)fludrocortisone will decrease the level or effect of bazedoxifene/conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• BCG vaccine live

  Serious - Use Alternative (1)fludrocortisone decreases effects of BCG vaccine live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• bemiparin

  Monitor Closely (1)fludrocortisone, bemiparin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• bendroflumethiazide

  Minor (1)fludrocortisone, bendroflumethiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• bivalirudin

  Monitor Closely (1)fludrocortisone, bivalirudin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• bosentan

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

• brexucabtagene autoleucel

  Serious - Use Alternative (1)fludrocortisone, brexucabtagene autoleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• budesonide

  Monitor Closely (1)budesonide will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• bumetanide

  Minor (1)fludrocortisone, bumetanide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• buspirone

  Monitor Closely (1)fludrocortisone will decrease the level or effect of buspirone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• butabarbital

  Monitor Closely (1)butabarbital will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• butalbital

  Monitor Closely (1)butalbital will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• calcium acetate

  Minor (1)fludrocortisone decreases levels of calcium acetate by increasing elimination. Minor/Significance Unknown.

• calcium carbonate

  Minor (1)fludrocortisone decreases levels of calcium carbonate by increasing elimination. Minor/Significance Unknown.

• calcium chloride

  Minor (1)fludrocortisone decreases levels of calcium chloride by increasing elimination. Minor/Significance Unknown.

• calcium citrate

  Minor (1)fludrocortisone decreases levels of calcium citrate by increasing elimination. Minor/Significance Unknown.

• calcium gluconate

  Minor (1)fludrocortisone decreases levels of calcium gluconate by increasing elimination. Minor/Significance Unknown.

• carbamazepine

  Monitor Closely (1)fludrocortisone will decrease the level or effect of carbamazepine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)carbamazepine will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• celecoxib

  Monitor Closely (1)celecoxib, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• cevimeline

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

• chlorothiazide

  Minor (1)fludrocortisone, chlorothiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• chlorpropamide

  Minor (1)fludrocortisone decreases effects of chlorpropamide by pharmacodynamic antagonism. Minor/Significance Unknown.

• chlorthalidone

  Minor (1)fludrocortisone, chlorthalidone. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• cholera vaccine

  Monitor Closely (1)fludrocortisone 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.

• cholestyramine

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

• choline magnesium trisalicylate

  Monitor Closely (1)choline magnesium trisalicylate, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone decreases levels of choline magnesium trisalicylate by increasing renal clearance. Minor/Significance Unknown.

• chromium

  Minor (1)fludrocortisone decreases levels of chromium by increasing renal clearance. Minor/Significance Unknown.

• cilostazol

  Monitor Closely (1)fludrocortisone will decrease the level or effect of cilostazol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ciltacabtagene autoleucel

  Serious - Use Alternative (1)fludrocortisone, ciltacabtagene autoleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• cimetidine

  Serious - Use Alternative (1)cimetidine will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• cinacalcet

  Monitor Closely (1)fludrocortisone will decrease the level or effect of cinacalcet by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ciprofloxacin

  Monitor Closely (1)fludrocortisone and ciprofloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• cisatracurium

  Monitor Closely (1)cisatracurium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• clarithromycin

  Monitor Closely (1)clarithromycin will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)clarithromycin will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.Minor (1)fludrocortisone will decrease the level or effect of clarithromycin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• clomipramine

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

• clopidogrel

  Monitor Closely (1)fludrocortisone will increase the level or effect of clopidogrel by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor. CYP3A4 inducers may increase the metabolism of clopidogrel to its active metabolite. Monitor patients for potential increase in antiplatelet effects when CYP3A4 inducers are used in combination with clopidogrel

• clotrimazole

  Monitor Closely (1)clotrimazole will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• clozapine

  Monitor Closely (1)fludrocortisone will decrease the level or effect of clozapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• colchicine

  Monitor Closely (1)fludrocortisone will decrease the level or effect of colchicine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• colestipol

  Minor (1)colestipol decreases levels of fludrocortisone by inhibition of GI absorption. Applies only to oral form of both agents. Minor/Significance Unknown.

• conivaptan

  Monitor Closely (2)conivaptan will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of conivaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• conjugated estrogens

  Monitor Closely (1)fludrocortisone will decrease the level or effect of conjugated estrogens by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• conjugated estrogens, vaginal

  Monitor Closely (1)fludrocortisone will decrease the level or effect of conjugated estrogens, vaginal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• cortisone

  Monitor Closely (1)cortisone will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• cyclopenthiazide

  Minor (1)fludrocortisone, cyclopenthiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• cyclosporine

  Monitor Closely (3)cyclosporine will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  cyclosporine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.
  
  fludrocortisone, cyclosporine. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may increase or decrease cyclosporine concentrations. Also, cyclosporine may increase the plasma concentrations of the corticosteroids. Monitor for changes in cyclosporine concentrations and for toxicities of corticosteroids and/or cyclosporine.

• dalteparin

  Monitor Closely (1)fludrocortisone, dalteparin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• danazol

  Minor (1)danazol, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• dapsone

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

• darifenacin

  Monitor Closely (1)darifenacin will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• darunavir

  Monitor Closely (2)darunavir will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of darunavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dasatinib

  Monitor Closely (1)dasatinib will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• deferasirox

  Monitor Closely (1)deferasirox will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dengue vaccine

  Monitor Closely (1)fludrocortisone 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)fludrocortisone, 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.

• desipramine

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

• dexamethasone

  Monitor Closely (1)dexamethasone will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• DHEA, herbal

  Monitor Closely (1)DHEA, herbal will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• diazepam

  Monitor Closely (1)fludrocortisone will decrease the level or effect of diazepam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• dichlorphenamide

  Monitor Closely (1)dichlorphenamide and fludrocortisone both decrease serum potassium. Use Caution/Monitor.

• diclofenac

  Monitor Closely (1)diclofenac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• diflunisal

  Monitor Closely (1)diflunisal, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone decreases levels of diflunisal by increasing renal clearance. Minor/Significance Unknown.

• dihydroergotamine

  Serious - Use Alternative (1)fludrocortisone will decrease the level or effect of dihydroergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• dihydroergotamine intranasal

  Serious - Use Alternative (1)fludrocortisone will decrease the level or effect of dihydroergotamine intranasal by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• diltiazem

  Monitor Closely (1)diltiazem will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• diphtheria & tetanus toxoids

  Serious - Use Alternative (1)fludrocortisone decreases effects of diphtheria & tetanus toxoids by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• diphtheria & tetanus toxoids/ acellular pertussis vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of diphtheria & tetanus toxoids/ acellular pertussis vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• diphtheria & tetanus toxoids/acellular pertussis/poliovirus, inactivated vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of diphtheria & tetanus toxoids/acellular pertussis/poliovirus, inactivated vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• disopyramide

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

• donepezil

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

• dronedarone

  Monitor Closely (2)dronedarone will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  dronedarone will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)fludrocortisone will decrease the level or effect of dronedarone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• dutasteride

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

• efavirenz

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

• eletriptan

  Monitor Closely (1)fludrocortisone will decrease the level or effect of eletriptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• enoxaparin

  Monitor Closely (1)fludrocortisone, enoxaparin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• eplerenone

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

• ergotamine

  Serious - Use Alternative (1)fludrocortisone will decrease the level or effect of ergotamine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin base

  Monitor Closely (1)erythromycin base will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (2)erythromycin base will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fludrocortisone will decrease the level or effect of erythromycin base by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin ethylsuccinate

  Monitor Closely (1)erythromycin ethylsuccinate will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (2)erythromycin ethylsuccinate will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fludrocortisone will decrease the level or effect of erythromycin ethylsuccinate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin lactobionate

  Monitor Closely (1)erythromycin lactobionate will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (2)erythromycin lactobionate will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fludrocortisone will decrease the level or effect of erythromycin lactobionate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• erythromycin stearate

  Monitor Closely (1)erythromycin stearate will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (2)erythromycin stearate will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.
  
  fludrocortisone will decrease the level or effect of erythromycin stearate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• estradiol

  Monitor Closely (1)fludrocortisone will decrease the level or effect of estradiol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estrogens conjugated synthetic

  Monitor Closely (1)fludrocortisone will decrease the level or effect of estrogens conjugated synthetic by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• estropipate

  Monitor Closely (1)fludrocortisone will decrease the level or effect of estropipate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ethacrynic acid

  Minor (1)fludrocortisone, ethacrynic acid. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• etodolac

  Monitor Closely (1)etodolac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• etravirine

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

• eucalyptus

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

• exenatide injectable solution

  Monitor Closely (1)fludrocortisone decreases effects of exenatide injectable solution by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids may diminish hypoglycemic effect of antidiabetic agents. Monitor blood glucose levels carefully. .

• exenatide injectable suspension

  Monitor Closely (1)fludrocortisone decreases effects of exenatide injectable suspension by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids may diminish hypoglycemic effect of antidiabetic agents. Monitor blood glucose levels carefully.

• felodipine

  Monitor Closely (2)fludrocortisone will decrease the level or effect of felodipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  felodipine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• fenoprofen

  Monitor Closely (1)fenoprofen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• fesoterodine

  Monitor Closely (1)fludrocortisone will decrease the level or effect of fesoterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• feverfew

  Minor (1)fludrocortisone decreases effects of feverfew by pharmacodynamic antagonism. Minor/Significance Unknown.

• finasteride

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

• fingolimod

  Monitor Closely (1)fludrocortisone 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. .

• fluconazole

  Monitor Closely (1)fluconazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fluoxymesterone

  Minor (1)fluoxymesterone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• flurbiprofen

  Monitor Closely (1)flurbiprofen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• fondaparinux

  Monitor Closely (1)fludrocortisone, fondaparinux. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• fosamprenavir

  Monitor Closely (2)fosamprenavir will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of fosamprenavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fosaprepitant

  Monitor Closely (2)fosaprepitant will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of fosaprepitant by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• fosphenytoin

  Monitor Closely (2)fosphenytoin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fosphenytoin will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• furosemide

  Minor (1)fludrocortisone, furosemide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• galantamine

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

• gemifloxacin

  Monitor Closely (1)fludrocortisone and gemifloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• glimepiride

  Minor (1)fludrocortisone decreases effects of glimepiride by pharmacodynamic antagonism. Minor/Significance Unknown.

• glipizide

  Minor (1)fludrocortisone decreases effects of glipizide by pharmacodynamic antagonism. Minor/Significance Unknown.

• glyburide

  Minor (1)fludrocortisone decreases effects of glyburide by pharmacodynamic antagonism. Minor/Significance Unknown.

• glycerol phenylbutyrate

  Monitor Closely (1)fludrocortisone decreases effects of glycerol phenylbutyrate by Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may cause the breakdown of body protein and increase plasma ammonia levels; monitor ammonia levels closely when glycerol phenylbutyrate is coadministered with corticosteroids.

• grapefruit

  Monitor Closely (1)grapefruit will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• griseofulvin

  Monitor Closely (1)griseofulvin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• haemophilus influenzae type b vaccine

  Monitor Closely (1)fludrocortisone decreases effects of haemophilus influenzae type b vaccine by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Avoid vaccination during chemotherapy or radiation therapy if possible because antibody response might be suboptimal. Patients vaccinated within a 14-day period before starting or during immunosuppressive therapy should be revaccinated =3 months after therapy is discontinued if immune competence has been restored.

• hemin

  Monitor Closely (1)fludrocortisone decreases effects of hemin by pharmacodynamic antagonism. Use Caution/Monitor. Drugs that increase delta-aminolevulinic acid synthetase may decrease hemin effect.

• heparin

  Monitor Closely (1)fludrocortisone, heparin. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• hepatitis A vaccine inactivated

  Serious - Use Alternative (1)fludrocortisone decreases effects of hepatitis A vaccine inactivated by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• hepatitis a/b vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of hepatitis a/b vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• hepatitis a/typhoid vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of hepatitis a/typhoid vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• hepatitis b vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of hepatitis b vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• human papillomavirus vaccine, nonavalent

  Serious - Use Alternative (1)fludrocortisone decreases effects of human papillomavirus vaccine, nonavalent by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs, and corticosteroids (used in greater than physiologic doses), may reduce the immune responses to vaccines.

• human papillomavirus vaccine, quadrivalent

  Serious - Use Alternative (1)fludrocortisone decreases effects of human papillomavirus vaccine, quadrivalent by pharmacodynamic antagonism. Avoid or Use Alternate Drug. Immunosuppressive therapies, including irradiation, antimetabolites, alkylating agents, cytotoxic drugs, and corticosteroids (used in greater than physiologic doses), may reduce the immune responses to vaccines.

• hydrochlorothiazide

  Minor (1)fludrocortisone, hydrochlorothiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• hydrocortisone

  Monitor Closely (1)fludrocortisone will decrease the level or effect of hydrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• hydroxyprogesterone caproate

  Monitor Closely (1)fludrocortisone will decrease the level or effect of hydroxyprogesterone caproate by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ibuprofen

  Monitor Closely (1)ibuprofen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• ibuprofen IV

  Monitor Closely (1)ibuprofen IV, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• idecabtagene vicleucel

  Serious - Use Alternative (1)fludrocortisone, idecabtagene vicleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• iloperidone

  Monitor Closely (1)fludrocortisone will decrease the level or effect of iloperidone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• imipramine

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

• indapamide

  Minor (1)fludrocortisone, indapamide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• indinavir

  Monitor Closely (2)indinavir will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  indinavir will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• indomethacin

  Monitor Closely (1)indomethacin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• influenza A (H5N1) vaccine

  Monitor Closely (1)fludrocortisone decreases effects of influenza A (H5N1) vaccine by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids used in greater than physiologic doses may reduce immune response to H5N1 vaccine.

• influenza virus vaccine (H5N1), adjuvanted

  Monitor Closely (1)fludrocortisone decreases effects of influenza virus vaccine (H5N1), adjuvanted by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids used in greater than physiologic doses may reduce immune response to H5N1 vaccine.

• influenza virus vaccine quadrivalent

  Serious - Use Alternative (1)fludrocortisone decreases effects of influenza virus vaccine quadrivalent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• influenza virus vaccine quadrivalent, adjuvanted

  Serious - Use Alternative (1)fludrocortisone 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 quadrivalent, cell-cultured

  Serious - Use Alternative (1)fludrocortisone decreases effects of influenza virus vaccine quadrivalent, cell-cultured by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• influenza virus vaccine quadrivalent, intranasal

  Serious - Use Alternative (1)fludrocortisone decreases effects of influenza virus vaccine quadrivalent, intranasal by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• influenza virus vaccine quadrivalent, recombinant

  Monitor Closely (1)fludrocortisone decreases effects of influenza virus vaccine quadrivalent, recombinant by pharmacodynamic antagonism. Use Caution/Monitor. Immune response to vaccine may be decreased in immunocompromised individuals.

• influenza virus vaccine trivalent

  Serious - Use Alternative (1)fludrocortisone decreases effects of influenza virus vaccine trivalent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• influenza virus vaccine trivalent, adjuvanted

  Serious - Use Alternative (1)fludrocortisone 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.

• influenza virus vaccine trivalent, recombinant

  Monitor Closely (1)fludrocortisone decreases effects of influenza virus vaccine trivalent, recombinant by pharmacodynamic antagonism. Use Caution/Monitor. Immune response to vaccine may be decreased in immunocompromised individuals.

• insulin aspart

  Minor (1)fludrocortisone decreases effects of insulin aspart by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin degludec

  Monitor Closely (1)fludrocortisone decreases effects of insulin degludec by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Endogneous cortisol is a regulatory hormone that increases blood glucose levels; exogenous systemic corticosteroids have been associated with hyperglycemia and may cause diabetes with chronic, high dose use; dose of antidiabetic agents may need adjustment and increased frequency of glucose monitoring may be required.

• insulin degludec/insulin aspart

  Monitor Closely (1)fludrocortisone decreases effects of insulin degludec/insulin aspart by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Endogneous cortisol is a regulatory hormone that increases blood glucose levels; exogenous systemic corticosteroids have been associated with hyperglycemia and may cause diabetes with chronic, high dose use; dose of antidiabetic agents may need adjustment and increased frequency of glucose monitoring may be required.

• insulin detemir

  Minor (1)fludrocortisone decreases effects of insulin detemir by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin glargine

  Minor (1)fludrocortisone decreases effects of insulin glargine by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin glulisine

  Minor (1)fludrocortisone decreases effects of insulin glulisine by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin inhaled

  Monitor Closely (1)fludrocortisone decreases effects of insulin inhaled by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Endogneous cortisol is a regulatory hormone that increases blood glucose levels; exogenous systemic corticosteroids have been associated with hyperglycemia and may cause diabetes with chronic, high dose use; dose of antidiabetic agents may need adjustment and increased frequency of glucose monitoring may be required.

• insulin lispro

  Minor (1)fludrocortisone decreases effects of insulin lispro by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin NPH

  Minor (1)fludrocortisone decreases effects of insulin NPH by pharmacodynamic antagonism. Minor/Significance Unknown.

• insulin regular human

  Minor (1)fludrocortisone decreases effects of insulin regular human by pharmacodynamic antagonism. Minor/Significance Unknown.

• isavuconazonium sulfate

  Monitor Closely (1)fludrocortisone and isavuconazonium sulfate both decrease immunosuppressive effects; risk of infection. Use Caution/Monitor.

• isoniazid

  Monitor Closely (1)isoniazid will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)fludrocortisone decreases effects of isoniazid by unknown mechanism. Minor/Significance Unknown.

• isradipine

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

• itraconazole

  Monitor Closely (1)itraconazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• Japanese encephalitis virus vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of Japanese encephalitis virus vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• ketoconazole

  Monitor Closely (2)ketoconazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ketoconazole will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Minor (1)fludrocortisone will decrease the level or effect of ketoconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• ketoprofen

  Monitor Closely (1)ketoprofen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• ketorolac

  Monitor Closely (1)ketorolac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• ketorolac intranasal

  Monitor Closely (1)ketorolac intranasal, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• lapatinib

  Monitor Closely (2)lapatinib will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  lapatinib will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• levofloxacin

  Monitor Closely (1)fludrocortisone and levofloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• levoketoconazole

  Monitor Closely (2)levoketoconazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  levoketoconazole will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Minor (1)fludrocortisone will decrease the level or effect of levoketoconazole by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• liraglutide

  Monitor Closely (1)fludrocortisone decreases effects of liraglutide by pharmacodynamic antagonism. Use Caution/Monitor. Corticosteroids may diminish hypoglycemic effect of antidiabetic agents. Monitor blood glucose levels carefully. .

• lisocabtagene maraleucel

  Serious - Use Alternative (1)fludrocortisone, lisocabtagene maraleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• lonapegsomatropin

  Monitor Closely (2)lonapegsomatropin decreases effects of fludrocortisone by Other (see comment). Use Caution/Monitor. Comment: Growth hormone (GH) inhibits microsomal enzyme 11 beta-hydroxysteroid dehydrogenase type 1, which converts cortisone to its active metabolite, cortisol. Patients with untreated GH deficiency may have increases in serum cortisol, and initiation of lonapegsomatropin may result decreased serum cortisol. Patients with hypoadrenalism treated with glucocorticoids may require an increase glucocorticoid stress or maintenance doses following lonapegsomatropin initiation.
  
  fludrocortisone decreases effects of lonapegsomatropin by Other (see comment). Use Caution/Monitor. Comment: Glucocorticoid therapy and supraphysiologic glucocorticoid treatment may attenuate the growth promoting effects of lonapegsomatropin in children. Carefully adjust glucocorticoid replacement dosing in children receiving glucocorticoid treatments to avoid both hypoadrenalism and an inhibitory effect on growth.

• lopinavir

  Monitor Closely (1)fludrocortisone will decrease the level or effect of lopinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• loratadine

  Monitor Closely (2)fludrocortisone will decrease the level or effect of loratadine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  loratadine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• lornoxicam

  Monitor Closely (1)lornoxicam, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• lumefantrine

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

• macimorelin

  Serious - Use Alternative (1)fludrocortisone, macimorelin. unspecified interaction mechanism. Avoid or Use Alternate Drug. Drugs that directly affect the pituitary secretion of growth hormone (GH) may impact the accuracy of the macimorelin diagnostic test. Allow sufficient washout time of drugs affecting GH release before administering macimorelin. .

• maraviroc

  Monitor Closely (1)fludrocortisone will decrease the level or effect of maraviroc by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• marijuana

  Monitor Closely (1)marijuana will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• measles (rubeola) vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of measles (rubeola) vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• measles mumps and rubella vaccine, live

  Serious - Use Alternative (1)fludrocortisone decreases effects of measles mumps and rubella vaccine, live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• measles, mumps, rubella and varicella vaccine, live

  Serious - Use Alternative (1)fludrocortisone decreases effects of measles, mumps, rubella and varicella vaccine, live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• meclofenamate

  Monitor Closely (1)meclofenamate, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• mefenamic acid

  Monitor Closely (1)mefenamic acid, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• meloxicam

  Monitor Closely (1)meloxicam, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• meningococcal A C Y and W-135 polysaccharide vaccine combined

  Serious - Use Alternative (1)fludrocortisone decreases effects of meningococcal A C Y and W-135 polysaccharide vaccine combined by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• mesalamine

  Minor (1)fludrocortisone decreases levels of mesalamine by increasing renal clearance. Minor/Significance Unknown.

• mesterolone

  Minor (1)mesterolone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• mestranol

  Monitor Closely (1)fludrocortisone will decrease the level or effect of mestranol by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• metformin

  Minor (1)fludrocortisone decreases effects of metformin by pharmacodynamic antagonism. Minor/Significance Unknown.

• methadone

  Monitor Closely (1)fludrocortisone will decrease the level or effect of methadone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• methyclothiazide

  Minor (1)fludrocortisone, methyclothiazide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• methylprednisolone

  Monitor Closely (1)fludrocortisone will decrease the level or effect of methylprednisolone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• methyltestosterone

  Minor (1)methyltestosterone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• metolazone

  Minor (1)fludrocortisone, metolazone. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• metronidazole

  Monitor Closely (1)metronidazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• metyrapone

  Minor (1)fludrocortisone decreases effects of metyrapone by unspecified interaction mechanism. Minor/Significance Unknown.

• miconazole vaginal

  Monitor Closely (1)miconazole vaginal will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• midazolam

  Monitor Closely (1)fludrocortisone will decrease the level or effect of midazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• mifepristone

  Contraindicated (1)mifepristone, fludrocortisone. Mechanism: unknown. Contraindicated. Mfr. states that mifepristone is contraindicated in pts. on long term corticosteroid Tx.

• miglitol

  Minor (1)fludrocortisone decreases effects of miglitol by pharmacodynamic antagonism. Minor/Significance Unknown.

• montelukast

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

• moxifloxacin

  Monitor Closely (1)fludrocortisone and moxifloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• nabumetone

  Monitor Closely (1)nabumetone, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• naproxen

  Monitor Closely (1)naproxen, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• nateglinide

  Minor (1)fludrocortisone decreases effects of nateglinide by pharmacodynamic antagonism. Minor/Significance Unknown.

• nefazodone

  Monitor Closely (1)nefazodone will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)nefazodone will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• nelfinavir

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

• nevirapine

  Monitor Closely (1)nevirapine will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nicardipine

  Monitor Closely (2)fludrocortisone will decrease the level or effect of nicardipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  nicardipine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• nifedipine

  Monitor Closely (2)nifedipine will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  nifedipine will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Minor (1)fludrocortisone will decrease the level or effect of nifedipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• nilotinib

  Monitor Closely (2)nilotinib will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  nilotinib will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• nimodipine

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

• nisoldipine

  Monitor Closely (1)fludrocortisone will decrease the level or effect of nisoldipine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• nitrendipine

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

• ocrelizumab

  Monitor Closely (1)fludrocortisone and ocrelizumab both increase immunosuppressive effects; risk of infection. Use Caution/Monitor. Coadministration of ocrelizumab with high doses of corticosteroids is expected to increase the risk of immunosuppression.

• ofatumumab SC

  Monitor Closely (1)ofatumumab SC, fludrocortisone. 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.

• ofloxacin

  Monitor Closely (1)fludrocortisone and ofloxacin both increase Other (see comment). Use Caution/Monitor. Coadministration of quinolone antibiotics and corticosteroids may increase risk of tendon rupture.

• olodaterol inhaled

  Monitor Closely (1)fludrocortisone and olodaterol inhaled both decrease serum potassium. Use Caution/Monitor.

• oxandrolone

  Minor (1)oxandrolone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• oxaprozin

  Monitor Closely (1)oxaprozin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• oxcarbazepine

  Monitor Closely (1)oxcarbazepine will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• oxybutynin

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

• oxymetholone

  Minor (1)oxymetholone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• ozanimod

  Monitor Closely (1)ozanimod, fludrocortisone. Either increases effects of the other by immunosuppressive effects; risk of infection. Use Caution/Monitor. Coadministration with immunosuppressive therapies may increase the risk of additive immune effects during 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 in order to avoid unintended additive immunosuppressive effects.

• paclitaxel

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

• paclitaxel protein bound

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

• pancuronium

  Monitor Closely (1)pancuronium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• parecoxib

  Monitor Closely (1)parecoxib, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone will decrease the level or effect of parecoxib by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.

• pentobarbital

  Monitor Closely (1)pentobarbital will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• phenindione

  Monitor Closely (1)fludrocortisone, phenindione. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• phenobarbital

  Monitor Closely (2)phenobarbital will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  phenobarbital will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• phenytoin

  Monitor Closely (2)phenytoin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  phenytoin will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• pimozide

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

• pioglitazone

  Minor (2)fludrocortisone will decrease the level or effect of pioglitazone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  fludrocortisone decreases effects of pioglitazone by pharmacodynamic antagonism. Minor/Significance Unknown.

• piroxicam

  Monitor Closely (1)piroxicam, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• pneumococcal vaccine 13-valent

  Serious - Use Alternative (1)fludrocortisone decreases effects of pneumococcal vaccine 13-valent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• pneumococcal vaccine heptavalent

  Serious - Use Alternative (1)fludrocortisone decreases effects of pneumococcal vaccine heptavalent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• pneumococcal vaccine polyvalent

  Serious - Use Alternative (1)fludrocortisone decreases effects of pneumococcal vaccine polyvalent by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• poliovirus vaccine inactivated

  Monitor Closely (1)fludrocortisone decreases effects of poliovirus vaccine inactivated by pharmacodynamic antagonism. Modify Therapy/Monitor Closely. Avoid vaccination during chemotherapy or radiation therapy if possible because antibody response might be suboptimal. Patients vaccinated within a 14-day period before starting or during immunosuppressive therapy should be revaccinated =3 months after therapy is discontinued if immune competence has been restored. .

• ponesimod

  Monitor Closely (1)ponesimod and fludrocortisone 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.

• posaconazole

  Monitor Closely (1)posaconazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• prednisone

  Monitor Closely (1)fludrocortisone will decrease the level or effect of prednisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• primidone

  Monitor Closely (1)primidone will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• propafenone

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

• protamine

  Monitor Closely (1)fludrocortisone, protamine. Other (see comment). Use Caution/Monitor. Comment: Corticosteroids may decrease anticoagulant effects by increasing blood coagulability; conversely, they may impair vascular integrity, thus increasing bleeding risk. Monitor INR closely.

• quercetin

  Monitor Closely (1)quercetin will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• quetiapine

  Monitor Closely (1)fludrocortisone will decrease the level or effect of quetiapine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• quinidine

  Monitor Closely (1)fludrocortisone will decrease the level or effect of quinidine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Serious - Use Alternative (1)quinidine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Avoid or Use Alternate Drug.

• quinine

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

• quinupristin/dalfopristin

  Monitor Closely (1)quinupristin/dalfopristin will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• rabies vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of rabies vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids may interfere with development of active immunity.

• rabies vaccine chick embryo cell derived

  Serious - Use Alternative (1)fludrocortisone decreases effects of rabies vaccine chick embryo cell derived by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• ranolazine

  Monitor Closely (1)ranolazine will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)fludrocortisone will decrease the level or effect of ranolazine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• repaglinide

  Monitor Closely (1)fludrocortisone will decrease the level or effect of repaglinide by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.Minor (1)fludrocortisone decreases effects of repaglinide by pharmacodynamic antagonism. Minor/Significance Unknown.

• rifabutin

  Serious - Use Alternative (1)rifabutin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rifampin

  Monitor Closely (1)rifampin will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)rifampin will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• rifapentine

  Monitor Closely (1)rifapentine will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ritonavir

  Monitor Closely (3)ritonavir will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of ritonavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  ritonavir will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• rocuronium

  Monitor Closely (1)rocuronium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• rosiglitazone

  Minor (1)fludrocortisone decreases effects of rosiglitazone by pharmacodynamic antagonism. Minor/Significance Unknown.

• rotavirus oral vaccine, live

  Serious - Use Alternative (1)fludrocortisone decreases effects of rotavirus oral vaccine, live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• rubella vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of rubella vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• rufinamide

  Monitor Closely (1)rufinamide will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• salicylates (non-asa)

  Monitor Closely (1)salicylates (non-asa), fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone decreases levels of salicylates (non-asa) by increasing renal clearance. Minor/Significance Unknown.

• salsalate

  Monitor Closely (1)salsalate, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone decreases levels of salsalate by increasing renal clearance. Minor/Significance Unknown.

• saquinavir

  Monitor Closely (1)fludrocortisone will decrease the level or effect of saquinavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• sargramostim

  Minor (1)fludrocortisone increases effects of sargramostim by pharmacodynamic synergism. Minor/Significance Unknown.

• saxagliptin

  Minor (2)fludrocortisone will decrease the level or effect of saxagliptin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Minor/Significance Unknown.
  
  fludrocortisone decreases effects of saxagliptin by pharmacodynamic antagonism. Minor/Significance Unknown.

• secobarbital

  Monitor Closely (1)secobarbital will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• silodosin

  Serious - Use Alternative (1)fludrocortisone will decrease the level or effect of silodosin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• simvastatin

  Monitor Closely (1)simvastatin will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• sipuleucel-T

  Monitor Closely (1)fludrocortisone decreases effects of sipuleucel-T by pharmacodynamic antagonism. Modify Therapy/Monitor Closely.

• sirolimus

  Monitor Closely (1)sirolimus will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)fludrocortisone will decrease the level or effect of sirolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• sitagliptin

  Minor (1)fludrocortisone decreases effects of sitagliptin by pharmacodynamic antagonism. Minor/Significance Unknown.

• smallpox (vaccinia) vaccine, live

  Serious - Use Alternative (1)fludrocortisone decreases effects of smallpox (vaccinia) vaccine, live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• sodium picosulfate/magnesium oxide/anhydrous citric acid

  Monitor Closely (1)fludrocortisone, sodium picosulfate/magnesium oxide/anhydrous citric acid. Either increases toxicity of the other by Other (see comment). Use Caution/Monitor. Comment: May be associated with fluid and electrolyte imbalances such as hypokalemia.

• sodium sulfate/?magnesium sulfate/potassium chloride

  Monitor Closely (1)sodium sulfate/?magnesium sulfate/potassium chloride increases toxicity of fludrocortisone 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 fludrocortisone 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/polyethylene glycol

  Monitor Closely (1)fludrocortisone and sodium sulfate/potassium sulfate/magnesium sulfate/polyethylene glycol both decrease serum potassium. Modify Therapy/Monitor Closely.

• solifenacin

  Monitor Closely (1)fludrocortisone will decrease the level or effect of solifenacin by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• somapacitan

  Monitor Closely (1)somapacitan decreases effects of fludrocortisone by Other (see comment). Modify Therapy/Monitor Closely. Comment: Microsomal enzyme 11-beta-hydroxysteroid dehydrogenase type 1 (11-beta-HSD-1) required for cortisone conversion to its active metabolite, cortisol, in hepatic and adipose tissue. GH inhibits 11-beta-HSD-1. Patients treated with glucocorticoid for hypoadrenalism may require increased maintenance or stress doses after initiating somapacitan.

• somatrem

  Monitor Closely (1)fludrocortisone decreases effects of somatrem by pharmacodynamic antagonism. Use Caution/Monitor.

• somatropin

  Minor (1)fludrocortisone decreases effects of somatropin by pharmacodynamic antagonism. Minor/Significance Unknown.

• sorafenib

  Monitor Closely (1)fludrocortisone decreases levels of sorafenib by increasing metabolism. Use Caution/Monitor.

• squill

  Serious - Use Alternative (1)fludrocortisone increases toxicity of squill by unspecified interaction mechanism. Avoid or Use Alternate Drug.

• St John's Wort

  Monitor Closely (1)St John's Wort will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)St John's Wort will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• succinylcholine

  Monitor Closely (1)succinylcholine, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• sufentanil

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

• sulfasalazine

  Monitor Closely (1)sulfasalazine, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.Minor (1)fludrocortisone decreases levels of sulfasalazine by increasing renal clearance. Minor/Significance Unknown.

• sulindac

  Monitor Closely (1)sulindac, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• tacrolimus

  Monitor Closely (2)fludrocortisone will decrease the level or effect of tacrolimus by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  tacrolimus will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Minor (1)fludrocortisone, tacrolimus. Either increases levels of the other by decreasing metabolism. Minor/Significance Unknown.

• testosterone

  Minor (1)testosterone, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• testosterone buccal system

  Minor (1)testosterone buccal system, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• testosterone intranasal

  Serious - Use Alternative (1)testosterone intranasal, fludrocortisone. Either increases effects of the other by Other (see comment). Avoid or Use Alternate Drug. Comment: Coadministration increases risk for edema, particularly in patients with cardiac, renal, or hepatic disease.

• testosterone topical

  Minor (1)testosterone topical, fludrocortisone. Either increases effects of the other by pharmacodynamic synergism. Minor/Significance Unknown. May enhance edema formation.

• tetanus toxoid adsorbed or fluid

  Serious - Use Alternative (1)fludrocortisone decreases effects of tetanus toxoid adsorbed or fluid by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• theophylline

  Monitor Closely (1)fludrocortisone will decrease the level or effect of theophylline by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tick-borne encephalitis vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of tick-borne encephalitis vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• tipranavir

  Monitor Closely (1)fludrocortisone will decrease the level or effect of tipranavir by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tisagenlecleucel

  Serious - Use Alternative (1)fludrocortisone, tisagenlecleucel. Either increases effects of the other by immunosuppressive effects; risk of infection. Avoid or Use Alternate Drug. Avoid prophylactic use of systemic corticosteroids as premedication before CAR-T cell therapy. Corticosteroids may, however, be required for treatment of cytokine release syndrome or neurologic toxicity.

• tofacitinib

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

• tolazamide

  Minor (1)fludrocortisone decreases effects of tolazamide by pharmacodynamic antagonism. Minor/Significance Unknown.

• tolbutamide

  Minor (1)fludrocortisone decreases effects of tolbutamide by pharmacodynamic antagonism. Minor/Significance Unknown.

• tolfenamic acid

  Monitor Closely (1)tolfenamic acid, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• tolmetin

  Monitor Closely (1)tolmetin, fludrocortisone. Either increases toxicity of the other by pharmacodynamic synergism. Use Caution/Monitor. Increased risk of GI ulceration.

• tolterodine

  Monitor Closely (1)fludrocortisone will decrease the level or effect of tolterodine by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• tolvaptan

  Monitor Closely (1)tolvaptan will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.Serious - Use Alternative (1)fludrocortisone will decrease the level or effect of tolvaptan by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Avoid or Use Alternate Drug.

• topiramate

  Monitor Closely (1)topiramate will decrease the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• torsemide

  Minor (1)fludrocortisone, torsemide. Mechanism: pharmacodynamic synergism. Minor/Significance Unknown. Risk of hypokalemia, especially with strong glucocorticoid activity.

• trastuzumab

  Monitor Closely (1)trastuzumab, fludrocortisone. 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, fludrocortisone. 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. .

• travelers diarrhea and cholera vaccine inactivated

  Serious - Use Alternative (1)fludrocortisone decreases effects of travelers diarrhea and cholera vaccine inactivated by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• trazodone

  Monitor Closely (2)fludrocortisone will decrease the level or effect of trazodone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  trazodone will decrease the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• triamcinolone acetonide injectable suspension

  Monitor Closely (1)fludrocortisone will decrease the level or effect of triamcinolone acetonide injectable suspension by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• triazolam

  Monitor Closely (1)fludrocortisone will decrease the level or effect of triazolam by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• typhoid polysaccharide vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of typhoid polysaccharide vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• typhoid vaccine live

  Serious - Use Alternative (1)fludrocortisone decreases effects of typhoid vaccine live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• ublituximab

  Monitor Closely (1)ublituximab and fludrocortisone 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

• vardenafil

  Monitor Closely (1)fludrocortisone will decrease the level or effect of vardenafil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• varicella virus vaccine live

  Serious - Use Alternative (1)fludrocortisone decreases effects of varicella virus vaccine live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• vasopressin

  Minor (1)fludrocortisone increases effects of vasopressin by pharmacodynamic synergism. Minor/Significance Unknown.

• vecuronium

  Monitor Closely (1)vecuronium, fludrocortisone. Other (see comment). Use Caution/Monitor. Comment: Coadministration of corticosteroids and neuromuscular blockers may increase risk of developing acute myopathy.

• verapamil

  Monitor Closely (3)verapamil will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  fludrocortisone will decrease the level or effect of verapamil by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.
  
  verapamil will increase the level or effect of fludrocortisone by P-glycoprotein (MDR1) efflux transporter. Use Caution/Monitor.

• vildagliptin

  Minor (1)fludrocortisone decreases effects of vildagliptin by pharmacodynamic antagonism. Minor/Significance Unknown.

• vincristine liposomal

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

• voriconazole

  Monitor Closely (1)voriconazole will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• warfarin

  Monitor Closely (1)fludrocortisone increases effects of warfarin by unspecified interaction mechanism. Use Caution/Monitor.

• willow bark

  Minor (1)fludrocortisone decreases levels of willow bark by increasing renal clearance. Minor/Significance Unknown.

• xipamide

  Monitor Closely (1)xipamide, fludrocortisone. pharmacodynamic synergism. Use Caution/Monitor. Risk of hypokalemia.

• yellow fever vaccine

  Serious - Use Alternative (1)fludrocortisone decreases effects of yellow fever vaccine by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• zafirlukast

  Monitor Closely (1)zafirlukast will increase the level or effect of fludrocortisone by affecting hepatic/intestinal enzyme CYP3A4 metabolism. Use Caution/Monitor.

• ziprasidone

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

• zonisamide

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

• zoster vaccine live

  Serious - Use Alternative (1)fludrocortisone decreases effects of zoster vaccine live by pharmacodynamic antagonism. Contraindicated. Corticosteroids also increase risk of infection with concomitant live vaccines.

• zoster vaccine recombinant

  Monitor Closely (1)fludrocortisone decreases effects of zoster vaccine recombinant by pharmacodynamic antagonism. Use Caution/Monitor. Immunosuppressive therapies may reduce the effectiveness of zoster vaccine recombinant.