For the temporary relief of: heartburn, acid indigestion, and sour stomach when accompanied with headache or body aches and pains; upset stomach with headache from overindulgence in food or drink; pain alone (headache or body and muscular aches and pains). Take any time - morning, noon or night - when you need relief. Alka-Seltzer lemon lime in water contains principally the antacid sodium citrate and the analgesic sodium acetylsalicylate.Active Ingredients: In Each Tablet: Anhydrous Citric Acid 1000 mg; Aspirin 325 mg (NSAID [Nonsteroidal Anti-Inflammatory Drug]); Sodium Bicarbonate 1700 mg