Aspirin 324mg, citric acid 965mg and sodium hydrogen carbonate 1744mg.
Alka-Seltzer must always Alka Seltzer must be dissolved in water before taking. Dosage: Adults and children aged 16 and over: 2 tablets every 4 hours, if necessary. Maximum dosage: Do not take more than 8 tablets in 24 hours. The dosages should not be continued for more than three days without consulting your doctor. Do not give to children aged under 16 years, unless on the advice of a doctor. If symptoms persist consult your doctor. Please read the enclosed leaflet carefully. DO NOT EXCEED THE STATED DOSE. CONTAINS ASPIRIN.