What occurs if you mix Diphenhydramine with Dextrometamorphine?

Mixing diphenhydramine, an antihistamine, with dextromethorphan, a cough suppressant, can increase the risk of side effects such as sedation, dizziness, and confusion. Both substances can cause drowsiness, and their combined effects may lead to heightened central nervous system depression. It is important to use caution and consult a healthcare professional before combining these medications to avoid potential adverse reactions.