Naproxen is a painkiller belonging to a class of drugs called non-steroidal anti-inflammatory drugs (NSAIDs). Other well-known NSAIDs include aspirin, ibuprofen and diclofenac. Naproxen is a stronger anti-inflammatory than aspirin and ibuprofen; it is thought to be similar in strength to diclofenac but carries fewer risks and side effects.

It can be used to treat pain where there is also inflammation present such as sprains, strains and mild arthritis.