The drug can decrease platelet aggregation and prolong bleeding time. It can reduce fever and inflammation, reducing their usefulness as symptoms for a … Synflex is an international brand of naproxen, a nonsteroidal antiinflammatory drug that is used to treat arthritis, ankylosing spondylitis, tendinitis, … Synflex contains naproxen sodium and is indicated in the treatment of pain due to musculoskeletal diseases or to surgical and dental procedures. 1984 Relieve pain and swelling with Synflex 275mg (Naproxen Sodium). Fast anti-inflammatory action. Shop now.