Comparison of metoprolol and propranolol in the treatment of akathisia.

Metoprolol was compared to propranolol in the treatment of neuroleptic-induced akathisia by means of an on-drug/off-drug crossover study. Both beta-blockers were effective, but the usefulness of metoprolol was limited by side effects due to the high dose of this medication required to produce a therapeutic effect. The mechanism of action of beta-blockers in the treatment of akathisia is discussed in light of the different pharmacologic properties of metoprolol and propranolol. The study results suggest that these agents are effective in reducing akathisia through a central mechanism of action requiring beta-2 blockade.