Lindsay Lohan's father says he wants to force his daughter into rehab to help her overcome her reported problem with prescription drugs.

Michael Lohan told the New York Post he was prepared to go to court to get conservatorship over the actress.

He is also quoted as telling the newspaper that his wife, Dina, supported his bid.

"I am going to go to court to get a legal conservatorship to get Lindsay into rehab and finally get her off all the prescription meds,” he said.

“Dina is going to sit down with me and the lawyers and make things right for Lindsay. She is taking Adderol, Xanax, Paxil.”

He added: “She's a beautiful girl but she looks 100 years old."

Michael's comments follow Lindsay's claim on Twitter last week that her father was a “lunatic”.

The actress also revealed that his bid to get conservatorship over her had upset her 15-year-old sister, Ali.

Lindsay Lohan