Harvard Heart Letter

Ask the doctor: Does Fosamax cause atrial fibrillation?

Ask the doctor

Does Fosamax cause atrial fibrillation?

Q. I am 86 years old and have been taking Fosamax to strengthen my bones for nearly 10 years. A few months ago, I suddenly fainted and was later diagnosed with atrial fibrillation. Did that happen because I was taking Fosamax?

A. Probably not. A few months ago, I would have said no, but two reports in the New England Journal of Medicine raised the possibility that Fosamax (alendronate) and another bone-building drug may — and I stress the "may" — contribute to atrial fibrillation.

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