The Sun understands that the father of the Mean Girls actress will stop at nothing to "make things right".
The 49-year-old rejected claims from Lindsay that he had made her emotionally plummet after going public with her problems.
He said: "While I'm very happy that Lindsay is beginning to come clean, the truth of the matter is I went public when she hit rock bottom. She did not go rock bottom when I went public.
"And while I find her admissions of her experiences with alcohol and cocaine to be noble, the real problem still exists with the prescription drug use that the so-called 'addiction specialist', therapist and doctors are prescribing to Lindsay."
However, Michael conceded that his split from ex-wife Dina led to Lindsay being "torn apart because they lost the stability of a family".
He added: "I will not stop [speaking out] until I finally get my daughter off of all the prescription drugs which she never needed and doesn't need no matter how much I get bad-mouthed or slandered by the people out there who aren't so perfect themselves.
"I will do all I can to make things right, even if it costs me, or is at my own expense!"