Fenoterol in asthma.

Fenoterol is a beta 2-sympathomimetic bronchodilator. In a double-blind cross-over trial in 17 asthmatic patients with reversible airway obstruction inhalation of both fenoterol (0.4 mg) and terbutaline (0.5 mg) produced a statistically significant greater increase in peak expiratory flow rate than did placebo. The magnitude and duration of response to fenoterol exceeded that to terbutaline in the doses used. The patients' subjective assessment also suggested the relief of their symptoms with the active drugs. Side effects were minimal.