Alka-Seltzer plus severe sinus congestion allergy and cough formula liquid gels helps relieve sinus congestion and pressure, headache, runny nose, sneezing, itchy watery eyes and cough. Acetaminophen 325 mg - pain reliever/fever reducer. Dextromethorphan hydro bromide 10 mg - cough suppressant. Doxylamine succinate 6.25 mg - antihistamine.