Whitney Houston L.A. Coroner Hunting Down Prescription Records

2/15/2012 9:41 AM PST

The L.A. County Coroner wants to get to the bottom of Whitney Houston's medical and pharmaceutical history -- obtaining subpoenas to get the singer's medical and drug records from her doctors.

According to Assistant Chief Coroner Ed Winter, it's not out of the ordinary to request such records.

As TMZ reported, there were a half-dozen Rx bottles in the hotel room where Whitney died, including prescriptions for Xanax, Amoxicillin and ibuprofen.  There was also a bottle of Midol, but nothing excessive or unusual.