Phenylephrine became the main decongestant in over-the-counter cold and allergy medicines in 2006, when sales of another decongestant, pseudoephedrine, were restricted in the U.S ...
The decongestant in question is phenylephrine, which is found in popular cough and cold products, including Benadryl Allergy Plus Congestion, Sudafed PE Sinus Congestion and Vick's DayQuil.