Anorectic effect of fenfluramine isomers and metabolites: Relationship between brain levels and in vitro potencies on serotonergic mechanisms

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Abstract
A study of the possible molecular mechanisms of action by which the isomers and metabolites of fenfluramine increase serotonin transmission, leading to anorectic activity, is presented. The actual brain levels of fenfluramine and norfenfluramine isomers after administration of equi-anorectic doses to rats are compared with their potencies in affecting serotonergic mechanisms in vitro. Isomers and metabolites of fenfluramine can have the same pharmacological action by influencing serotonin uptake, release and binding in a quantitatively different manner.

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