Brand and Other Names:
- Classes: Beta2 Agonists
Dosing & Uses
Dosage Forms & Strengths
Asthma, Reversible Bronchospasm
20 mg PO three/four times daily
Serious - Use Alternative
Significant - Monitor Closely
Diaphoresis increased (4%)
Exacerbation of asthma (2%)
Tachycardia secondary to heart condition
Reports of some patients who developed cramps in muscles of extremities which responded to potassium salts PO
Use caution in recent MI, myocardial insufficiency, HTN, hyperthyroidism, severe cardiovascular disorder, seizure disorders
Increases risk of hypokalemia;; use with caution
Beta2-agonists may increase serum glucose; use caution
Metered-dose inhalers that contain chlorofluorocarbons (CFCs) are currently being phased out in the United States; alternate inhalers without CFCs are available
Pregnancy & Lactation
Pregnancy Category: C
Lactation: Not known if excreted in breast milk, not recommended
A:Generally acceptable. Controlled studies in pregnant women show no evidence of fetal risk.
B:May be acceptable. Either animal studies show no risk but human studies not available or animal studies showed minor risks and human studies done and showed no risk.
C:Use with caution if benefits outweigh risks. Animal studies show risk and human studies not available or neither animal nor human studies done.
D:Use in LIFE-THREATENING emergencies when no safer drug available. Positive evidence of human fetal risk.
X:Do not use in pregnancy. Risks involved outweigh potential benefits. Safer alternatives exist.
NA:Information not available.
Mechanism of Action
Beta-2 receptor agonist with some beta-1 activity; stimulation of beta2 receptors may result in bronchial smooth muscle relaxation
Onset: 30 min (oral)
Peak effect: 1 hr
Duration: 2-6 hr
Excretion: Uurine (40%)
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