You can purchase most antihistamines over-the-counter (OTC), meaning you do not need a prescription ... take these drugs ...

It may include over-the-counter (OTC) drugs like Dramamine (dimenhydrinate) and Pepto-Bismol (bismuth subsalicylate) or prescription medications like Zofran (ondansetron ... Doing so can ease symptoms ...

Over-the-counter and prescription ... antihistamines can still be effective for years after their expiration date. Just keep in mind that once you get two or three years past expiration, there's ...