Oxytocin attenuates respiratory depression and reduces mortality from fentanyl and the combination of xylazine-fentanyl in rats. - Escobar JB; Wainwright J; Wang X; Dergacheva O; Kay MW; Bethea JR; Jain V; Polotsky VY; Mendelowitz D (Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie, 2026)