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Fexofenadine and calcium (1) (1)
I have been taking generic Allegra (fexofenadine hydrochloride) to relieve allergy symptoms for about a year. One thing that I noticed in reading the patient literature - was that patients should not take an antacid within two hours of taking the Allegra (fexofenadine). I figured that the antacid must somehow interfere with the absorption of the antihistamine, so I just always reminded myself to avoid antacids in the morning... no prob.

Recently, I decided to start taking a calcium supplement. I noticed that my multivitamin is a little lacking in that department, so I decided to look for a calcium tablet.

It occurred to me that the most common antacids like Tums and Rolaids are basically calcium-based. So I decided to ask a pharmacist for input. I wanted to make sure that I wouldn't pick a calcium supplement that might interfere with my fexofenadine.

The pharmacist told me that calcium, in any form, will interfere with the absorption of fexofenadine. Even though the patient literature only refers to antacids, even drinking milk could prevent fexofenadine from providing its full benefit. Accordingly, I was instructed to be certain to space my antihistamine and my calcium supplements at least two hours apart.

Just thought that this was interesting and less than obvious,
 
 
Tags: allegra, fexofenadine, calcium, antacids, interactions
Posted By: new_knee Posted 4 Years, 6 months, 3 days ago Personal Story
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