Alternate medications for the treatment of Tourette syndrome are required because haloperidol in some patients either may be ineffective or may cause disturbing side effects. Propranolol, a beta-adrenergic blocking agent, has been reported as effective, in uncontrolled trials, in ameliorating symptoms of tic disorder, tardive dyskinesia, and drug-induced extrapyramidal syndrome. Propranolol, in doses up to 120 mg per day, was administered to five patients with Tourette syndrome in a placebo-controlled study and was found ineffective in ameliorating symptoms of Tourette syndrome. Results underscored the importance of placebo-controlled investigation when evaluating the effects of drugs in Tourette syndrome.
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