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Two men who've become lovers struggle with issues in one another's lives in this drama from writer and director Chud (born Danny Cheng). Kafka (Byron Pang) is a gifted martial artist who also works as a personal trainer and a delivery courier, needing a steady income to care for his ailing mother and her medical treatments. Kafka has just ended a long-term relationship with his girlfriend May (Linda So) and is feeling out of sorts when he meets David (Thomas Price), a financier who moved to Hong Kong after the Wall Street collapse of 2008 in hopes of starting his life over again. David, who is gay, is clearly attracted to Kafka, and after ardently pursuing the handsome athlete Kafka is seduced by David. While both David and Kafka are looking for a relationship, David discovers his new lover has more issues than he expected; Kafka is not accustomed to being in a same sex relationship and he's living with a drug problem. Meanwhile, David has to contend with Linda (Winnie Leung), a woman he was briefly involved with who wants to reconnect with him. Amphetamine was an official selection at the 2010 Berlin International Film Festival.