An off-brand version of Dayquil and Nyquil sold at Costco stores has been recalled due to substandard quality.

Medications that contain phenylephrine often contain other active ingredients ... getting the benefits from the other ...

Last month, the U.S. Food and Drug Administration proposed removing phenylephrine -- an active ingredient in hundreds of over-the-counter medications, including some versions of Tylenol, Benadryl, ...