Phenergan Syrup contains Promethazine, an antihistamine used to treat allergies, cough, nausea, and cold symptoms. It works by blocking histamine in the body to relieve sneezing, runny nose, itching, and allergic reactions. It also helps calm the cough reflex and reduce nausea or vomiting. Because it can cause drowsiness, Phenergan Syrup should be taken as prescribed by a doctor, especially in children
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