Captagon

Fenethylline is a codrug of amphetamine and theophylline, used as a psychostimulant under the brand names Captagon, Biocapton, and Fitton. It was synthesized in 1961 and used for 25 years to treat conditions such as hyperkinetic children, narcolepsy, and depression. Fenethylline was listed as a schedule I controlled substance in the US in 1981 and became illegal in most countries in 1986 due to its similarity in chemical composition to amphetamines. It is now primarily produced for illicit use, with Syria being the world's largest producer, accounting for about 80% of the global supply.learn more on wikipedia