it is concluded that the combination of naproxen sodium 550 mg and codeine phosphate 60 mg , as indicated by its effects on experimentally induced pain , can produce more intense analgesia than the same doses of naproxen sodium and codeine administered alone , and that naproxen sodium and codeine phosphate given in combination enhanced each other 's effect in an additive manner .
C0030193
pain
C0009214
codeine