The purpose of this brief work is to study and make a general survey of the problem of obesity as related in whatever way, to the use of psychotropic drugs. It is a fact learned through clinical experience and knowledge by clinics and researchers working in the field of psychotropic drugs that patients subjected to extended therapy with such drugs show, in a considerable number of cases, an increase in body weight. We consider that this obesity, the pathogenetic cause of which is attributed to the action of psychotropic drugs, constitutes a serious disadvantageous side-effect of those drugs, since a large number of mental patients discontinue their drug therapy for the reasons that it is responsible for the increase in their body weight. It is a known fact discontinuation of the psychotropic drug treatment generally results in a relapse of their mental disorder.