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.
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