WATCHING Beautiful Boy at the cinema, two things become apparent. That no amount of Hollywood lighting can glamorise the grinding monotony of relapse, the way the cycle repeats and repeats, boring and predictable and maddening. A bit like the film itself.

Nic Sheff got addicted to crystal meth when he was a teen. New film ‘Beautiful Boy’ shows how his father helped him overcome years of drug abuse. He spoke to Esther McCarthy.