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Diphenhydramine is an antihistamine used to alleviate symptoms associated with allergies, hay fever, and the common cold, such as rash, itching, watery eyes, itchy eyes/nose/throat, cough, runny nose, and sneezing. It also helps prevent and treat nausea, vomiting, and dizziness due to motion sickness and can aid in relaxation and sleep. This medication functions by blocking histamine, a natural substance produced during allergic reactions, and acetylcholine, which contributes to symptoms like watery eyes and runny nose. It is important to note that cough-and-cold products containing diphenhydramine are not recommended for children under 6 years of age unless directed by a healthcare professional, and certain forms are not suggested for those under 12. These products do not cure the common cold and may lead to serious side effects if not used correctly. Always adhere to dosage instructions, avoid using the product to induce sleepiness in children, and consult with a doctor or pharmacist for safe usage and alternative symptom relief methods, such as staying hydrated or using a humidifier.