Diphenhydramine is an antihistamine that is widely used as both generic and over-the-counter medication to relieve symptoms of allergies and the common cold. It’s better known as Benadryl (brand name). Like any other drug, it can have adverse effects. The given infographic shows them. This list includes uncomfortable symptoms which are reported most often. They don’t require medical help unless they are bothersome, severe, or don’t fade in a few days or weeks.
But AddictionResource authors say that you should patiently wait until they subside as your body adjusts to the medicine. If you have a dry mouth, chewing sugar-free gum or sucking on hard candy, and drinking more water may help. The drying properties of Benadryl also may result in headaches. So, drink more water to stay hydrated and avoid headaches. If you feel dizzy, try to not stand up quickly, especially if you are an older patient. This reduces the risk of dizziness or fainting.