Interference: Grapefruit juice interferes with the body's metabolism of allegra, (fexofenadine) preventing the natural process. Thus the drug can have unintended effects.
Answered 8/2/2012
5.7k views
Decreased absorption: If you take Allegra (fexofenadine) with juice, you can decrease the amount of the medication absorbed and therefore not receive the full effect you were hoping to achieve.
Answered 6/24/2014
5.7k views
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