exist. NA: Information not available. Mechanism of Action Beta-2 receptor agonist with some beta-1 activity Pharmacokinetics Half-Life: 2 hr Onset: <5 min; 0.5-1 hr (peak effect) Duration: 5 hr Metabolism: Hepatic Excretion: Urine (10%) No images available for this drug. No images available for this drug.A Patient Handout is not currently available for this monograph.Print