Fleetwood Mac icon Stevie Nicks regrets taking medication to help her drug addiction because it "ruined" a large chunk of her life.

The singer, 62, who battled substance abuse in the 1980s, entered the Betty Ford Clinic in 1986 to overcome an addiction to cocaine. That same year a psychiatrist prescribed her Klonopin which is usually for seizures and panic disorders. The results were almost fatal.

"That ruined my life for eight years," she told FOX411's Pop Tarts. "That was just a stupid doctor making a groupie mistake and just wanting me to come in there, tell him about all my music friends and young Hollywood, and that nearly ruined my life and nearly killed me."