Since the September withdrawal, the price for prescription-strength Motrin rose from $30 to $34; while prescriptions for Mobic doubled from 314,000 to 742,000.
Mobic makers, Boehringer, said the painkiller was their second best selling drug last year, up 44%.
The findings come weeks after the FDA asked Pfizer to pull its pain killer, Bextra, after it was found to cause similar heart problems and a fatal skin condition; as a result, the agency ordered stronger warnings on pain medication.
Vioxx, Bextra, and Pfizer are known as Cox-2 drugs, thought to be easier on the stomach than naproxen or ibuprofen.
The report analyzed data from health care information company NDCIHealth and did not consider over-the-counter medicines.
