Phenylephrine is a medication that’s been used to relieve nasal congestion caused by colds, allergies, and hay fever, per the ...

An extensive review determined that the ingredient, oral phenylephrine, doesn’t actually relieve nasal congestion.

Sudafed, Mucinex, Benadryl, Advil, Tylenol, Vicks, and Dimetapp. These popular brand names appear on oral decongestants that ...