Take the antacid a few hours before or afterAllegra-D. Allegra-d medication is available without prescription behind the counter to adults 18 years of age or older. The concurrent use of Allegra-D tablets with over-the-counter antihistamines and decongestants. Fexofenadine is an anti-histaminic and pseudoephedrine is a decongestant. Pseudoephedrine is a decongestant. Take the tablet with food. Allegra-d comes as an extended-release tablet to take by mouth. Allegra-d medication has generic version available.
