title: Increased neonatal mortality in offspring of male rats treated with methadone or morphine before mating.
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D004305:Dose-Response Relationship, Drug; D005260:Female; D008297:Male; D008691:Methadone / Q000633:toxicity*; D009020:Morphine / Q000633:toxicity*; D009026:Mortality; D051381:Rats; D013094:Spermatozoa / Q000187:drug effects; D013997:Time Factors
chemical_list: D009020:Morphine; D008691:Methadone