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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.
Guest. I just saw my Doctor again yesterday. Confirmed again that taking Allegra and Sudafed together are fine. She recommended it. Just don't take the Allegra D and a Sudafed and you are doubling the dosage of recommended PSEUDOEPHEDRINE.t worsens during spring, because allergic rhinitis kicks in and when the symptoms of these two conditions combine, I can hardly wait for the spring to finish. Of all symptoms, strong headaches are giving me the problem, they are especially emphasized when I have to bend or pick up something from the floor.