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Diphenhydramine is an antihistamine commonly 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. Additionally, it is effective in preventing and treating nausea, vomiting, and dizziness due to motion sickness. Diphenhydramine may also aid in relaxation and promote sleep. The medication functions by blocking histamine, a natural substance in the body responsible for allergic reactions. It also reduces symptoms like watery eyes and runny nose by inhibiting acetylcholine, another natural substance in the body. It is important to note that cough-and-cold products containing diphenhydramine are not proven safe or effective for children under 6 years old, and should not be used for treating cold symptoms in this age group unless advised by a doctor. Moreover, long-acting formulations are not recommended for children under 12 years. To minimize potential side effects, it is crucial to follow dosage instructions carefully and avoid using this product to induce sleep in children. Additionally, be cautious of administering other medications that may contain similar ingredients. For alternative methods to relieve cough and cold symptoms, consider consulting a healthcare professional for advice on hydration, using a humidifier, or applying saline nasal sprays.