Question: what is the best otc medicine to dry up a runny nose?
Answer: When you have a cold, your body makes chemicals called histamines. That leads to sneezing, a runny nose, and watery eyes. Over-the-counter antihistamines such as chlorpheniramine and diphenhydramine block this process and can relieve those symptoms. They can also make you sleepy and dry out your eyes, nose, and mouth.