This material may not be broadcast, published, rewritten or redistributed without written permission. More Saturday 09 February 2008 Allergy med cited in death of CEO with Marion ties 2006 plane crash that killed. What other information should know? Return to top Ask your pharmacist any questions you have about diphenhydramine. Nasdaq:EURX specialty pharmaceutical company that develops, manufactures and. PRECAUTIONS: Before taking diphenhydramine, purchase diphenhydramine tell your doctor or pharmacist if you are allergic to or if you have any other allergies. What does my medication look like? Acetaminophen, diphenhydramine, and phenylephrine is available over-the-counter under several brand and generic names. Incompatible: Amobarbital, amphotericin B, dexamethasone sodium phosphate with lorazepam and metoclopramide, iodipamide meglumine, phenytoin, phenobarbital, thiopental.