Aspirin has only one ingredient: acetylsalicylic acid. The term aspirin is a generic name. But in countries where 'Aspirin' is a registered trademark owned by Bayer, the generic term is acetylsalicylic acid (ASA).
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The active ingredient in Asprin is acetylsalicylic acid, abbreviated as ASA. It is an analgesic (relieves pain). antipyretic (reduces fever). and an anti-inflammatory (reduces inflammation).