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Yes: You can take them together. Allegra 24 hour is a nonsedating antihistamine and Sudafed PE is a decongestant. This would be similar to taking allegra D. What you do not want to do is take Allegra D with sudafed, then you would get too much decongestant.Also you want to avoid decongestants if you have certain conditions like hypertension.Also don't take the sudafed at bedtime....Read more.hat you do not want to do is take Allegra D with sudafed, then you would get too much decongestant. Also you want to avoid decongestants if you have certain conditions like hypertension. Also don't take the sudafed at bedtime. ...Read more.
Before taking fexofenadine and pseudoephedrine, 1  tell your doctor and pharmacist if you are allergic to fexofenadine (Allegra), pseudoephedrine (Sudafed, in Dimetapp, in Drixoral, others), any other medications, or any of the ingredients in the tablets.2  Ask your pharmacist for a list of the ingredients.f you are taking fexofenadine and pseudoephedrine 12-hour tablets, you may notice something that looks like a tablet in your stool. This is just the empty tablet shell, and this does not mean that you did not get your complete dose of medication.