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It is also spelled phenethylline and fenetylline (INN); other names for it are amphetaminoethyltheophylline and amfetyline. The drug was marketed for use as a psychostimulant under the brand names Captagon, Biocapton, and Fitton. Captagon was first manufactured in 1961 as an alternative to amphetamine and methamphetamine used at the time to treat narcolepsy, fatigue, and the behavioral disorder “minimal brain dysfunction”.