Alka Seltzer is a an effervescent tablet that contains 324 mg acetylsalicylic acid and belongs to the group of NSAIDs. Alka Seltzer is used for reduction of pain, fever and inflammation. Indications are head ache, muscle ache, rheumatic pain, lumbago, menstrual pain, tooth ache, pain and fever caused by the flue or caused by vaccines. Always read the leaflet before use of medication.