Allegra-D Side Effects

Allegra-D, manufactured by sanofi-aventis, is an allergy medication that contains the decongestant pseudoephedrine. The most severe side effects experienced by Allegra-D users are often due to the pseudoephedrine contained in the medication, not its other active ingredient, fexofenadine. Fexofenadine can also cause side effects; however, they are usually milder than those caused by pseudoephedrine.

Possible Side Effects

• Possible side effects of Allegra-D include dry mouth, stomach discomfort, loss of appetite, insomnia, blurred vision, dizziness, drowsiness, ringing in the ears and lack of concentration. Some people experience excitability, most common in children.

Serious Side Effects

• Serious side effects that can be caused by Allegra-D are confusion, irregular heartbeat, increased blood pressure, anxiety, hallucinations, flu-like symptoms and difficulty urinating.

Drug Interactions

• Allegra-D can interact with many medications, including aspirin, high blood pressure drugs, beta blockers and anti-depressants. People experiencing allergy symptoms are advised to alert their pharmacist to any herbal remedies, over the counter medications and prescription medications they are taking before using Allegra-D.

Health Conditions

• People who have diabetes, kidney disease, heart disease, high blood pressure, glaucoma, thyroid problems or difficulty urinating should ask their physician before taking Allegra-D.

Allergy Tests

• Allegra-D can invalidate the results of certain allergy tests.