The effect of zimelidine and amitriptyline on the brain concentration of some indolic and phenolic monoamines in the mouse

European Journal of Pharmacology
A V Juorio, A A Boulton


The increase in mouse brain tryptamine accumulation rate and 5-hydroxytryptamine (5-HT) concentration and the reduction in 5-hydroxyindole acetic acid concentration observed after zimelidine administration suggest that the treatment reduces the brain tryptophan availability. Amitriptyline produced no significant changes on tryptamine, 5-HT or 5-hydroxyindole acetic acid. Also, zimelidine reduced mouse brain p-tyramine, increased m-tyramine and increased homovanillic acid. Similar effects were observed after amitriptyline administration. The experiments show that both drugs affect dopamine turnover and tyramine concentration in a similar fashion to that observed for the antipsychotic group of drugs, thus suggesting that they may have some antipsychotic effects, especially if administered at the high dose levels. In addition, it may also possess some of the undesirable effects of this group of drugs.


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Homovanillic Acid
Hydroxyindoleacetic Acid

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