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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.
The only medicine for headaches that you can take is Tylenol (acetominophen). It sucks, I know. You can't take sudafed while pregnant. Benedryl is safe. I took tylenol and lots of water, the sinus headaches did get better. You could also try hot and cold ice packs and flushing your nose with Ocean saline spray.