OTC
Antihistamine and Expectorant (Cough medicine)
Diphenhydramine HCl; Ammonium chloride
Last reviewed April 2026
Who is this for?
What is this drug?
This is a combination medicine containing diphenhydramine (an antihistamine that stops coughs and reduces allergic reactions) and ammonium chloride (an expectorant that helps loosen thick mucus so you can cough it out more easily). Together, they relieve cough and clear your chest.
What is it used for?
Coughchesty cough with mucus (phlegm)dry irritating coughcommon cold symptomsrunny nosesneezingallergic cough
Available Over The Counter
Available at pharmacies without a prescription. Rules may vary by country.
Quick Interaction Check
Is Diphenhydramine safe to take with another drug?
Check with multiple drugs →