Procaterol and terbutaline in bronchial asthma. A double-blind, placebo-controlled, cross-over study.

Procaterol, a new beta-2 adrenoceptor stimulant, was studied in a double-blind, placebo-controlled, cross-over trial in patients with bronchial asthma. Oral procaterol 50μg b.d., procaterol 100 μg b.d., and terbutaline 5 mg t.i.d., were compared when given randomly in 1-week treatment periods. The best clinical effect was found with terbutaline. Both anti-asthmatic and tremorgenic effects of procaterol were dose-related. Procaterol appeared effective in the doses tested, and a twice daily regimen would appear to be suitable with this drug.