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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.
See if they can try something other than Allegra. Good Luck, you might also ask about using a nasal spray that you can use for 3 days at a time. It will give you relief right away. If you have congestion then a decongestant will help. If you have a runny nose, then you want an antihistamine (Allegra).'m dizzy a couple times/day, like a spinning dizziness, like you're going to lose your balance. I'm scared to go off the Allegra b/c I believe it may be helping the excruciating pain in my ear. But the pressure is really getting to me.