London, UK - Tom Felton has opened up about his painful experience with addiction as a child star.

The Draco Malfoy actor has revealed some dark days behind him.

In his new memoir Beyond the Wand: The Magic and Mayhem of Growing Up a Wizard, the Harry Potter star dished on his difficult relationship with alcohol, which led to several rehab stints.

"I went from being not particularly interested in drinking to regularly having a few pints a day before the sun had even gone down, and a shot of whiskey to go with each of them," Felton penned in an excerpt shared by CNN.

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"The alcohol, though, wasn't the problem. It was the symptom. The problem was deeper."

Felton said that he did go to rehab after his then-girlfriend and management team staged an intervention, but he made a break for it after a few days.

Eventually, the now 35-year-old decided to seek help, calling it "one of the hardest decisions I ever had to make."

"But the very fact that I was able to admit to myself that I needed some help – and I was going to do something about it – was an important moment," he said.

"I am no longer shy of putting my hands up and saying: I'm not okay."

Felton credited his Harry Potter costar and close friend Emma Watson for giving him the courage to address his past addiction in his new memoir.