Drug Interactions between etidronate and risedronate

Food, especially calcium-containing food such as dairy products, significantly decreases the absorption of etidronate. For at least the first 2 hours after taking etidronate, do not eat or drink anything other than plain water, and do not take any other medicines including vitamins or mineral supplements which are high in metals such as calcium, iron, magnesium, or aluminum. Use only plain water (not mineral water) when taking etidronate tablets.

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Food may reduce the absorption of risedronate, which may lead to lower blood levels of the medication and possibly reduced effectiveness. You should take risedronate first thing in the morning, at least 30 minutes before you eat or drink anything or take any other medication. Take each dose with a full glass (6 to 8 ounces) of water, and use only plain water (not mineral or vitamin water). Do not take risedronate if you cannot sit upright or stand for at least 30 minutes. Because risedronate can cause irritation and ulcer in the stomach or esophagus (the tube that connects your mouth and stomach), you will need to stay upright for at least 30 minutes after taking this medication. Talk to your doctor or pharmacist if you have questions on how to take this or other medications you are prescribed. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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Etidronate and multivitamin with minerals should not be taken orally at the same time. Products that contain magnesium, aluminum, calcium, iron, and/or other minerals may interfere with the absorption of etidronate into the bloodstream and reduce its effectiveness. You should take multivitamin with minerals at least 2 hours before or 2 hours after the etidronate dose. Talk to a healthcare professional if you are not sure whether a product contains something that could potentially interact with your medication or if you have questions on how to take this or other medications you are prescribed. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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The recommended maximum number of medicines in the 'bone resorption inhibitors' category to be taken concurrently is usually one. Your list includes two medicines belonging to the 'bone resorption inhibitors' category:

• etidronate
• risedronate

Note: In certain circumstances, the benefits of taking this combination of drugs may outweigh any risks. Always consult your healthcare provider before making changes to your medications or dosage.