Reports say Mischa Barton is said to have recently collapsed at her Los Angeles home because she had allegedly snorted cocaine three days in a row.
The 23-year-old actress remained in an involuntary psychiatric hold after reportedly suffering a meltdown.
Pals of the former O.C star informed police amid fears she would kill herself after three days of hard partying.
"She's in very bad shape. She's running out of money and can't find love, so now she is looking for a good time to escape her misery. She is on a downward spiral. She is a mess. She is a suicidal, uninsurable mess," the Daily Express quoted a friend as telling the New York Post.
Los Angeles police and Barton's representative have suggested that the actress required assistance for "a medical issue."
They haven't revealed any further details.