Los Angeles: Rapper Eminem says his rehab experience was a nightmare and waste of time that ultimately led him back to drugs.

The 'Not Afraid' hitmaker enrolled in a rehabilitation centre to get help for an addiction to prescription pills six, but it was a failure because he spent much of his time trying to protect his belongings from opportunist fellow patients, reported a magazine.

"Every addict in rehab feels like everyone's staring at them. With me, everyone was staring at me. I could never be comfortable. There were people there that treated me normal. Then there were a bunch of idiots who aren't even concentrating on their own sobriety because they're so worried about mine. They're stealing my hats, my books - it was chaos," Eminem said.

"Everything was drama in there. And, at the time, I didn't really want to get clean. Everybody else wanted me to. And anyone will tell you, if you're not ready, nothing is going to change you," he added.

The star also said that his fear of dying ultimately forced him to clean up his act.

"(One day) I had a feeling in my arm that was weird, man. Like, it really freaked me out. So I went to some people I trust and said, 'Look, I know I need help. I'm ready now.' I got a room in the same hospital where I overdosed, and I detoxed," he said.