bone drugs may cause unexpected heart problems

According to this article, research done recently has found a correlation between two similar osteoporosis drugs and irregular heart rhythms. Reclast and Fosamax are two drugs in this class that have been, until now, proven to be almost side effect free. The risk of the side effect is still believed to be minimal, however studies are being done to make sure there isn't a greater risk than was originally thought. In the case of Reclast, it has been proven to be equally as effective as other drugs in the same class, but has almost double the risk of developing the heart arrhythmia as those on other drugs. So far, studies have shown that the overall risk of cardiac death is still tiny and the risk of developing the irregular rhythm is still small. Both drugs fall into the class of biphosphates, and further studies are being done to ensure the safety of the drugs.

http://www.cnn.com/2007/HEALTH/conditions/05/02/bone.drugs.ap/index.html