title: Onset and duration of beta-adrenergic receptor blockade following single oral dose acebutolol hydrochloride (Sectral).
abstract: 1. The onset and duration of action of once daily acebutolol (400 mg) on resting and exercise heart rate and blood pressure were studied in normal subjects in a double-blind, cross-over trial against placebo. Subjects were studied 1.5, 3, 8 and 24 h after the first dose and 24 h after the fifth dose. 2. Resting and exercise heart rate and blood pressure were significantly reduced within 90 min of the first dose. 3. A significant reduction in these variables persisted throughout 24 h after the fifth daily dose. However, at 24 h the effects were considerably attenuated, the falls in resting and exercise systolic blood pressure being only 5%. 4. A linear relationship was noted between log serum drug level and percentage reduction of exercise heart rate.
mesh_terms: D000070:Acebutolol / Q000494:pharmacology*; D000319:Adrenergic beta-Antagonists; D000328:Adult; D001794:Blood Pressure / Q000187:drug effects; D004311:Double-Blind Method; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006801:Humans; D008297:Male; D005082:Physical Exertion; D010919:Placebos; D013997:Time Factors
chemical_list: D000319:Adrenergic beta-Antagonists; D010919:Placebos; D000070:Acebutolol