Question: what is the difference between allegra d and zyrtec?
Answer: Treats allergy symptoms and congestion. Allegra-D (fexofenadine / pseudoephedrine) is a combination allergy medicine that's useful if you have congestion and runny nose. Zyrtec (cetirizine) works to treat sneezing and runny nose, and causes less sedation compared to Benadryl.