Pharmacology Adrenergic System 26dc8d2f Half life of Dobutamine is: A 120 seconds B 200 seconds C 20 seconds D 20 minutes High-Yield Explanation Ans. (A) 120 seconds(Ref: Lawrence 9/e p453)Dobutamine is an inotropic drug which has onset of action = 1-2 min.Peak action = 1-10 min.Duration of action = < 10 min.Half life = 2 min.