The authors present case reports of three patients with similar pathology in their social, vocational, and sexual adjustment who developed paranoid or paranoid hallucinatory syndromes in conjunction with the abuse of mephentermine from Wyamine inhalers. Their symptomatology appeared clinically identical to amphetamine psychosis or acute paranoid schizophrenia. The authors conclude that, if abused, the Wyamine inhaler is potentially dangerous and that its availability on the market constitutes a loophole in the current regulations governing stimulant drugs.Abstract Teaser