“Melatonin antagonist receptor attenuates the antinociceptive synergism between l-tryptophan and dipyrone.”
“RESULTS The combined treatment with l- ryptophan an d dip yrone or paracetamol reduced significantly the ED50 of these analgesics when compared to the isolated treatments.”
“The l-tryptophan interacts synergistically with dipyrone and paracetamol both orally and by i.p.”