What if i take two allegra (fexofenadine) d, is this safe?

Double dosing: Many over-the counter medications are provided at 1/2 the prescription dose. For example, otc Pepcid (famotidine) is 20mg, whereas the prescribed dose is usually 40 mg. This general principle does not apply to all medications and Allegra-D is a good example. Double dosing the pseudofed in this medication could be dangerous. Always ask the pharmacist about safety before double dosing any otc medications.

Which dose?: The 12-hour version Allegra D contains 120mg of pseudoephedrin and the 24-hour Allegra D contains 240mg of pseudoephedrine. You should not take 2 of the 24 hour Allegra D.