A comparison of alpidem and placebo in relieving benzodiazepine withdrawal symptoms

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Abstract
Chronic normal-dose benzodiazepine users requesting drug withdrawal were allocated to substitution with either the new anxiolytic alpidem (n = 13) or placebo (n = 12). During the first 2 weeks of the tapering programme, the dose of benzodiazepine was kept constant; for the next 2 weeks it was halved and half-dose alpidem (25 mg twice daily) or placebo substituted; for weeks 5 and 6, the benzodiazepine was discontinued and full-dose alpidem or placebo given; next alpidem or placebo were tapered to half-dose and then finally discontinued. Regular anxiety and tranquillizer withdrawal ratings were made. Nine of 12 patients given placebo withdrew successfully compared with four of 13 alpidem-treated patients. Anxiety and other symptom levels increased in the alpidem but not the placebo patients. It was concluded that alpidem is not helpful in helping patients withdrawing from a benzodiazepine withdrawal perhaps because of partial agonist properties. These actions may imply a lesser propensity to induce dependence on long-term use.

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