1. The effects of 160 mg of propranolol and 160 mg of a long-acting (LA) formulation of propranolol were studied in healthy subjects.

2. Both drugs reduced an exercise tachycardia but the peak was less and the 24 h effect greater after long-acting propranolol than after propranolol.

3. These differences were maintained on repeated dosing for 8 days.

4. In contrast to single doses of 400 mg of sotalol, 160 mg of oxprenolol and 160 mg of slow-release oxprenolol, the peak effect of long-acting propranolol was less and that at 24 h was greater.

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