Abstract
Few clinical reports describe tolerance induced by antidepressants and this question is considered an unsolved problem for clinical use of this group of drugs. The present report deals with the effects of imipramine and mianserine on two animal models of depression, after acute or prolonged previous treatment with these antidepressants. Imipramine and mianserine potentiated amphetamine-induced anorexia both after acute administration or after prolonged previous treatment with each drug. Mianserine effects were not detected in the behavioral despair test and imipramine reduced rats immobility equally after acute and prolonged previous treatment. It was concluded that imipramine and mianserine do not induce detectable tolerance when previously administered to animals submitted to amphetamine anorexia or behavioral despair.
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