Question: what is the difference between allegra d 12 hour and 24 hour?
Answer: Allegra-D comes in a 12-hour and 24-hour tablet. The 12-hour formulation contains 60 mg of fexofenadine and 120 mg of pseudoephedrine while the 24-hour formulation contains 180 mg of fexofenadine and 240 mg of pseudoephedrine. Allegra-D is only recommended for adults and children who are 12 years of age or older.