The generic name for a common nonprescription medication useful in the treatment of mild pain or fever. This is called paracetamol in the UK. Acetaminophen, 4'-hydroxyacetanilide, is a non-opiate, non-salicylate analgesic and antipyretic which occurs as a white, odorless, crystalline powder, possessing a slightly bitter taste. It has the following molecular formula C8H9NO2 with a molecular weight of 151.16.