(KABC) --The FDA is issuing an alert for patients who take a class of popular osteoporosis drugs.The problem is that they can cause severe, debilitating joint, bone and muscle pain. The prescription drugs are called bisphosphonates. They include Merck's Fosamax and Procter & Gamble and Sanofi-Aventis' Actonel.
The pain can start days, months or even years after starting therapy.
While the labels contain warnings, the FDA says doctors might overlook the link. If doctors think these drugs are causing severe pain, they should discontinue use.