Promethazine is a first-generation antihistamine and phenothiazine derivative. It works by blocking histamine H1 receptors, which helps reduce allergic responses. It also has strong anticholinergic, sedative, and antiemetic (anti-nausea) effects due to its action on other receptors in the brain.
Quagen’s formulation is an oral solution (syrup), often prescribed for its versatility in treating multiple symptoms. It is prescription-only and should be used exactly as directed
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