2017-06-302026-03-272017-06-302012Juan Carlos Bautista Ramírez0014-299910.1016/j.ejphar.2011.10.034https://doi.org/10.1016/j.ejphar.2011.10.034https://repositorio.inprf.gob.mx/handle/123456789/6205engacceso cerradoSynergistic antinociceptive actions and tolerance development produced by morphine-fentanyl coadministration: correlation with _-opioid receptor internalizationarticle1879-07122-3Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz239-247Países Bajos674Analgesics, Opioidadministration & dosageAnalgesics, OpioidpharmacologyAnimalsArrestinsmetabolismDose-Response Relationship, DrugDrug SynergismDrug ToleranceEndocytosisdrug effectsFentanyladministration & dosageFentanylpharmacologyLocus Coeruleusdrug effectsLocus CoeruleusmetabolismMaleMorphineadministration & dosageMorphinepharmacologyNociceptiondrug effectsPeriaqueductal Graydrug effectsPeriaqueductal GraymetabolismRatsRats, WistarReceptors, Opioid, muagonistsReceptors, Opioid, mumetabolismAnalgesics, OpioidArrestinsReceptors, Opioid, mubeta-arrestinFentanylMorphine