The Medical Board of California is investigating the doctors who prescribed a variety of medications to Lindsay Lohan.

An attorney for the actress’ father, Michael Lohan, sent a letter to the California attorney general in July asking for an investigation into “the unscrupulous doctors [who] overprescribe medications…”

TMZ.com reported that the attorney general referred the matter to state medical board, which launched an investigation.

“The Medical Board is investigating and Michael and I are cooperating with them,” Bloom confirmed to the website.

The board would not confirm that any investigation was taking place, according to E! Online, as the oversight body is not permitted to publicly disclose any pending cases until charges are pressed and the investigation became a matter of public record.

Such investigations usually take several months, the report states.

Lohan was released early from a 90-day court-ordered rehab stint last month. TMZ said doctors at the UCLA rehab facility believe the actress was misdiagnosed with – and therefore wrongfully prescribed medication for – Attention Deficit Hyperactivity Disorder.

Prior to entering UCLA, according to the website, Lohan had various prescriptions, including ones for Dilaudid, Adderall, Nexium, Zoloft, Trazodone and Ambien.

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