Allegra is an antihistamine. It may help if the congestion is allergy related. It also depends on what is causing the congestion and where the congestion is occuring. Sometimes a decongestant or a combination of an antihistamine and decongestant works best especially if the congestion is nasal. If the congestion is in the chest, something like Mucinex might work better.
I've always used actifed which helps to dry you up. It depends on what is causing it, & if you are taking about drainage from the nose or as Dzoo says the lungs Mucinex helps better. Actifed before it was OTC was doctors favoirite drug when people came in all stuffed up with colds & flu like symptoms. Now I know I have allergies, it really helps with them too. Just my thoughts...
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