Fenethylline
（重定向自Fenetylline）
![Space-filling model of the captagon molecule](/Images/godic/202501/12/Captagon_molecule_spacefill5220.png")
Fenethylline (BAN, USAN), also spelled phenethylline and fenetylline (INN), and also known as amphetaminoethyltheophylline and amfetyline, is a codrug of amphetamine and theophylline which behaves as a prodrug to both of the aforementioned drugs. It is marketed for use as a psychostimulant under the brand names Captagon, Biocapton, and Fitton.