BISPHOSPHONATES AND IRON

The oral absorption of bisphosphonates is significantly reduced (90% reduction with clodronate) by aluminium/magnesium hydroxide. Other polyvalent cations, such as iron, are expected to interact similarly.
Bisphosphonates should be prevented from coming into contact with iron. Recommendations on the timing of administration of bisphosphonates in relation to food and other drugs varies. Alendronate and risedronate should be taken at least 30 minutes before taking the first food or drink of the day, clodronate should probably be taken at least 1 hour before or after iron, ibandronate should be taken 1 hour before iron, and etidronate and tiludronate should be taken at least 2 hours apart from iron.
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