Psychiatrymiddle twist
A 19-year-old man is admitted with a four-week history of persecutory beliefs and voices commenting on his actions. He has used methamphetamine most days for a year and cannabis daily since he was fifteen. He has now been in hospital and abstinent for two weeks and the psychotic symptoms persist unchanged. His mother has schizophrenia. He is willing to engage with treatment and the team is planning his care after discharge. Which one of the following approaches to his substance use and his psychosis is most appropriate?