ST. LOUIS — A St. Louis area doctor has admitted to writing fraudulent prescriptions for pain pills on her own prescription pad and then posing as patients to pick up the drugs at pharmacies.

The St. Louis Post-Dispatch reports that Dr. Angela K. Williams pleaded guilty Tuesday to a felony charge of fraudulently obtaining oxycodone.

Prosecutors say the 34-year-old Florissant physician also used another doctor's prescription pad and personal information to write prescriptions. The pills were for her personal use.

She could face up to four years in prison. Her sentencing is scheduled for April.