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The hallucinogenic drugs represent a recurrent outbreak pattern with each generation or two seeming to rediscover their ego-dissolving effects. The inhalants produce a short-lived intoxication with certain volatile solvents affecting specific organ systems.
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Rats trained to discriminate (+/-) 2,5-dimethoxy-4-methylphenylisopropylamine (DOM) (1.0 mg/kg) from saline, using a standard two-lever operant task, were challenged with various doses of 3,4-methylenedioxyphenylisopropylamine (MDA) and several related agents. The (+/-)-DOM stimulus generalized to (+/-)-MDA, suggesting that both agents apparently produce similar stimulus cues. Related agents, known to produce effects in man similar to those produced by (+/-)-MDA, also resulted in generalization when administered to the DOM-trained animals, e.g., R(-)-MDA and a methoxylated derivative of (+/-)-MDA, (+/-)-2-OMe-4,5-MDA. DOM stimulus generalization was not observed for S(+)-MDA, the N-monomethyl and alpha-demethyl derivatives of MDA, nor for a metabolite of MDA (i.e., 3-methoxy-4-hydroxyphenylisopropylamine). The results suggest that R(-)- and (+/-)-MDA, as well as (+/-)-2-OMe-4,5-MDA, but not the other derivatives of MDA, are capable of producing behavioral (stimulus) effects common to those produced by the training dose of (+/-)-DOM.
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Isolated strips of sheep umbilical arteries contracted in the presence of R-(-)-2-amino-1-(2,5-dimethoxy-4-methylphenyl) butane (BL3912A). These contractions faded over an hour period and at this time BL3912A antagonized contractions to R-(-)-DOM, 5-hydroxytryptamine (5-HT) but not to angiotensin. The initial contraction produced by BL3912A was antagonized by cinanserin, a 5-HT antagonist. These experiments indicate that BL3912A can be classified as a partial agonist of 5-HT receptors in sheep umbilical arteries.