PDR Health



Allegra is a medication used to treat allergies. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms. Allegra is available as an over-the-counter (OTC) drug and as a prescription drug.

Side Effects

Common side effects of Allegra include:





-Stomach pain

If you experience any of these side effects, you should contact your doctor. Allegra can also cause serious side effects, including anaphylaxis and angioedema. Anaphylaxis is a life-threatening allergic reaction that can cause difficulty breathing, swelling of the throat, and low blood pressure. Angioedema is a serious condition that causes swelling of the face, lips, tongue, or throat. If you experience either of these side effects, you should seek medical attention immediately.


The recommended Allegra dosage for adults and children 12 years of age and older is 60 mg twice daily or 180 mg once daily. The Allegra dosage for children 6 to 11 years old is 30 mg twice daily. Allegra should be taken with water.


Allegra can interact with other medications, so it is important to talk to your doctor or pharmacist about all the medications you are taking, including OTC drugs and supplements. Allegra should not be taken with fruit juices or soda. Allegra can make you more sensitive to sunlight, so you should avoid sun exposure and use sunscreen when you are outdoors.