A Double-Blind Trial of Penbutolol: A New Beta-Receptor Blocking Agent in the Treatment of Angina Pectoris

Abstract
A double-blind placebo controlled study of angina pectoris with Penbutolol was undertaken in parallel groups in fifty-two patients. The duration of the study was six weeks. The dosage range for Penbutolol was 8 mg to 50 mg per day. Six patients were dropped from the analysis. Seventeen patients (81%) in the Penbutolol series exhibited a 50% reduction in anginal attacks, NTG consumption and subjective improvement. Significant reduction in nitrite intake was observed. Effort tolerance was improved significantly in those receiving penbutolol. Penbutolol was well-tolerated.