Gardaí confirmed last night a full criminal investigation was under way after the incident in Courtmacsherry.
The man, who is believed to be in his 30s and from England, barricaded himself into a house on the outskirts of the seaside village on Wednesday evening following a domestic dispute at the house earlier.
It is understood a knife was produced during the dispute, and the man’s wife fled with their children.
The man then barricaded himself into the house, still armed with a knife.
Gardaí were alerted and they requested back-up from the armed Regional Support Unit (RSU).
A Garda negotiator came to the scene and spent almost an hour trying to persuade the man to leave the house peacefully.
Gardaí eventually made a decision to enter the house by force.
Several armed officers from the RSU broke down the door, overpowered, and disarmed the man. There were no injuries.
However, amid concerns the man had taken tablets, he was taken to Cork University Hospital for treatment.
Inspector Brendan Fogarty said a full investigation was under way and a file would be prepared for the DPP in due course.