The comparative effects of ICI 118551 and propranolol on essential tremor.

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Abstract
1. The effects of the selective beta 2‐adrenoceptor antagonist ICI 118551 on essential tremor, heart rate and blood pressure were compared with those of propranolol. 2. ICI 118551 (150 mg daily for 7 days) and propranolol (120 mg daily for 7 days) were about equally effective in reducing essential tremor (by about 40%) and were more effective than placebo. 3. When compared with the effect of placebo, propranolol reduced blood pressure and exercise heart rate whereas ICI 118551 had no significant effect on blood pressure and produced a small but significant reduction in exercise‐induced tachycardia. 4. ICI 118551 may be useful in the management of essential tremor while having fewer cardiovascular side‐effects than non‐selective beta‐adrenoceptor antagonists.

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