Double action pain relief with caffeine Alka-Seltzer XS provides rapid relief from headache with upset stomach. Alka-Seltzer XS contains two pain relieving agents to help relieve headache. It also contains an antacid to calm an upset stomach & buffering agents which empty the stomach to aid relief. Also works on general pain such as Migraine, Period pains, Rheumatic & muscular pain & symptomatic relief of colds & flu. Direction for use: Alka-Seltzer XS should always be dissolved in water before use. Dosage: 2 tablets every 4 hours, if necessary. 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 less than 16 years. Ingredients: Aspirin 267mg Paracetamol 133mg Caffeine 40mg Sodium Hydrogen Carbonate 1606mg Citric Acid 954mg Sodium Content per tablet 445mg.