diphenhydramine hydrochloride
Diphenhydramine hydrochloride is an antihistamine commonly used to relieve symptoms of allergies, hay fever, and the common cold. It works by blocking the action of histamine, a substance in the body that causes allergic symptoms such as sneezing, itching, and runny nose. It is also effective in reducing motion sickness and inducing sleep.
This medication is available over-the-counter in various forms, including tablets, capsules, and liquid. While generally safe for short-term use, it can cause side effects like drowsiness, dizziness, and dry mouth. Users should follow dosage instructions and consult a healthcare professional if needed.