why can't you take allegra with orange juice
The reason why you shouldn't drink orange juice, grapefruit juice or any fruit juice is due to absorption. Fruit juices make it difficult for the body to absorb the Allegra.
The reason that it is advised not to drink orange juice with the prescription medicine Allegra is because it lessens the absorption rate of the medicine. This is true of other fruit juices as well. For more information, see this link: http://www.drugs.com/food-interactions/fexofenadine,allegra.html.
The chemical components of Allegra are affected by acids that can be found in orange juice. These acids may cause you to ingest toxins into your liver.
Any kind of fruit juice (including orange juice) can inhibit your body's absorption of the medication Allegra. Visit http://www.drugs.com/allegra.html for more information.