The 33-year-old star, best known for playing Henry VIII in the TV show The Tudors, reportedly took a load of pills at his £3million home in Maida Vale, London.
It's claimed paramedics found him at his home after answering a 999 call but had to contact the police when he refused treatment.
A source said to UK newspaper The Sun: 'This is very sad. It was the opinion of those present that he tried to take his own life.'
The actor has been battling a problem with drink for some time now and it's claimed he was recently discharged from hospital and told the newspaper: 'No comment.'