DRINKING
A Sikh must not drink any kind of alcohol. It is one of the Kurahits (prohibitions) for a Sikh. Drinking leads a man to evil thoughts. It affects man’s capacity to understand, rationalise, analyse and differentiate between good and bad. It is anti-spiritual in nature and it also spoils physical and mental health.
A Sikh should not take any intoxicant, bhang (cannabis indica), opium or any drug.
However, to my mind, using alcohol (e.g. red wine) for medical reasons, (and that even not in public) is not a taboo for a Sikh.
(Dr Harjinder Singh Dilgeer)