A 31-year-old man shocked by a Winnipeg police stun gun this week suffers from schizophrenia and is a former resident of a provincial mental health institution, his mother told CBC News Wednesday.

The man was in critical condition Monday night when he was taken to hospital after the stun-gun incident and put into a medically induced coma.

His condition has been upgraded to stable, police said Wednesday.

The man's mother said that her son's behaviour is "unpredictable" and that he takes medication daily. He lives in a downtown group home but once lived at a mental health centre in Selkirk, about 40 kilometres north of Winnipeg.

CBC News is not identifying the man or his mother out of privacy concerns.

Police said officers came upon the man at about 10 p.m. when they were investigating a domestic incident on Balmoral Street. The man was at the rear of a building in the 300 block of nearby Kennedy Street.

Police have not released any information about why the officers used the stun gun, except to say the man was belligerent and refused to follow instructions.

The incident, which is under investigation, is not related to the domestic matter, police said.