Naproxen is a nonsteroidal anti-inflammatory drug used to treat pain, menstrual cramps, and inflammatory diseases such as rheumatoid arthritis, gout and fever. It is taken orally. CANSIN OINTMENT INDICATION: For symptomatic relief from joint pains, inflammation, backache, sprains, myositis, fibrositis and lumbago. DIRECTION FOR USE: Massage two pulpfuls gently into affected area until completely absorbed, two to three times daily.