A man Tasered after he barricaded himself in a room and threatened self-harm is unlikely to face any charges, police say.

Police at Dunedin were called to a High St home about 6.40pm yesterday after the 46-year-old man threatened self-harm with a knife.

Attempts by three officers at the scene to negotiate with the man to leave the room were unsuccessful.

Acting Senior Sergeant Chris George said police entered the room and "it became apparent the man intended seriously harming himself and a Taser was used to defuse the situation".

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Ambulance and police officers provided first aid before the man was taken to emergency psychiatric services at Dunedin Hospital.

Mr George said the man remained there in psychiatric care this morning.

He said it was police that all Taser incidences were reviewed.