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Pharmacology: Diphenhydramine HCl, a cough suppressant (antitussive), acts centrally by depressing the cough center in the medulla of the brain and therefore elevates the threshold for coughing. Diphenhydramine HCl is also a sedating antihistamine which diminishes allergic symptoms by blocking histamine receptors.
Phenylpropanolamine HCl, a nasal decongestant, clears obstructed and congested air passages making breathing easier.
