Do cold and flu tablets with oral phenylephrine effectively relieve congestion?

Cold and flu tablets containing oral phenylephrine do not effectively relieve nasal congestion. Recent evidence and regulatory actions support this conclusion. The FDA Advisory Committee (September 2023) unanimously found that oral phenylephrine, at over-the-counter (OTC) doses, fails to provide meaningful decongestant effects compared to placebo [[3]]. This led the FDA to propose removing oral phenylephrine as an approved active ingredient in OTC nasal decongestants [[3]]. The primary reason for its ineffectiveness is low oral bioavailability (~38%), which limits the amount of drug absorbed into the bloodstream to levels insufficient for reducing nasal swelling [[1], [4]]. Systematic reviews and independent analyses, including one by GoodRx (2023) and a Henry Ford Health blog (2023), corroborate that oral phenylephrine offers no clinically or statistically significant relief from congestion [[2], [4]]. While oral phenylephrine is safe at OTC doses, its lack of efficacy makes its use unfavorable when decongestion is needed. For effective alternatives, consider pseudoephedrine (available behind pharmacy counters), phenylephrine nasal sprays, or oxymetazoline nasal sprays, which act locally and bypass the issue of low bioavailability [[2], [5]]. Saline sprays and antihistamines may also help, especially if congestion is allergy-related. In summary, oral phenylephrine tablets should not be relied upon for congestion relief, and proven alternatives should be prioritized.