Police said Christopher Lazarus Boubis, 39, later regained consciousness in the emergency ward at Thalang Hospital, but immediately went on a rampage through the facility, the Phuket Gazette reported.
"He was shouting and verbally abusing staff, scaring them, before he collapsed again unconscious in an emergency treatment room," a nurse told the Gazette.
As the Australian awoke, she said, he seemed dazed and confused. "He even groped one of the female staff."
Officers from the Thalang police station arrived soon after to take Mr Boubis into custody. He was later released and escorted by police to his hotel in Patong.
"No charges were brought against him as no complaints were filed against him and there was no damage to any property," said Lt Chatree Chuwichian.
However, Lt Chatree urged tourists to be more responsible while on holiday.
"We understand people come here to have a good time, but please be careful about how much alcohol you drink. If you get too drunk, you could easily harm yourself or others," he said.