Trainspotting follows the lives of a group of Scottish friends who are deeply consumed by heroin addiction. Mark Renton (played by Ewan McGregor) is the main protagonist who is desperately trying to break free from his addiction and the toxic environment that fuels it. His friends, who are also addicts, include Sick Boy (played by Jonny Lee Miller), Spud (played by Ewen Bremner) and Begbie (played by Robert Carlyle).
Throughout the movie, the characters struggle with a number of intense and sometimes violent situations as they try to navigate their addiction. The movie explores themes of friendship, addiction, poverty, and the struggle to find purpose in life.
Mark's journey to sobriety is fraught with struggle and he must confront his own demons, including his heroin addiction. He also must navigate relationships that are strained due to his addiction, including his toxic friendship with Begbie, which threatens his ability to stay clean.
Overall, Trainspotting is a raw and sometimes brutal look at the realities of drug addiction and how it affects those who live with it. The movie was a critical and commercial success, with its gritty portrayal of the lives of addicts inspiring a cult following.