While oral phenylephrine is on the way out as an OTC cold remedy, other commonly sold cold medications like guaifenesin (expectorant) and dextromethorphan (for cough) also have dubious evidentiary backing.
Dextromethorphan has had other uses though.
While oral phenylephrine is on the way out as an OTC cold remedy, other commonly sold cold medications like guaifenesin (expectorant) and dextromethorphan (for cough) also have dubious evidentiary backing.
Dextromethorphan has had other uses though.