"I'm going to get her off the prescription drugs that she's on," Lohan told us in a candid interview. "I hate it when people talk about illegal drug abuse... because it's not just drinking and illegal drugs that kill you. Prescription drugs can destroy and kill a person and are sometimes harder to stop. Look at Heath Ledger and Michael Jackson."

Lohan asked us not to reveal what specific medications he believes his daughter is abusing, but says they've taken over her life.

"You know why Lindsay's not acting in feature films right now? Because she can't," he said. "Because the girl with all the talent is hidden and buried deep inside this fungus that's grown because of the prescription drugs. She can't be herself. When you hug her she's like, vacant inside. When she kisses or holds me I get chills, and not in a good way-in a bad way."

"She's a different person. I was out there for a week when she was living at the Sunset Marquis Hotel and I would sit there and cry. It was horrible. This was not the kid I raised," Lohan told RadarOnline.com.

Lohan says he's speaking out now because he's worried about Lindsay's health and fears she's being taken advantage of by those he calls "enablers."

"I don't care what anyone says about Lindsay. The Lindsay Lohan I lived with when I was married was a focused, intelligent, gifted girl that needed no prescription medication, no assistance from a therapist. Whoever the people are that came into her life and convinced her otherwise should be thrown in jail, because they're the same type of people who are responsible for the deaths of Heath Ledger, Michael Jackson and DJ AM," Lohan said. "Everything was fine in our family until Dina and I got divorced. And that's when all the kids' lives started to unravel... including Lindsay's."