title: Nandrolone modulates the non-opioid and opioid analgesia and tolerance/dependence: role of sexual dimorphism.
abstract: The aim of this investigation was to study the effect of the doping steroid nandrolone on metamizol and morphine-induced analgesia and tolerance/dependence in rats. Nandrolone per se did not change the basal nociceptive thresholds in both sexes. It diminished the analgesic effect of metamizol in females, revealed by tail flick test, and males, revealed by paw pressure and hot plate tests. In general, the action of nandrolone was to decrease the morphine-induced analgesia in female and male rats. This was strongly manifested by paw pressure and tail flick tests in male, and tail flick tests in female animals. Nandrolone slowed the development of opioid tolerance/dependence. It aggravated the withdrawal syndrome in the females and invigorated aggression in the males. The data provide evidence that anabolic steroid nandrolone might decrease the analgesic action of metamizol or morphine. The doping steroid could modulate opioid tolerance/dependence and the aggressive behavior in a gender dependent manner. The action of nandrolone is most likely due to profound long-term effects on the central nervous system and might be a gateway to addiction of other drugs of abuse.
authors: Institute of Physiology, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria.
authors: Tz
authors: T
authors: Philipova
authors: T
authors: T
authors: Ivanova
authors: E
authors: E
authors: Pavlova
authors: L
authors: L
authors: Kasakov
authors: M
authors: M
authors: Vlaskovska
mesh_terms: D018712:Analgesics, Non-Narcotic / Q000009:adverse effects / Q000494:pharmacology*; D000701:Analgesics, Opioid / Q000009:adverse effects / Q000494:pharmacology*; D000818:Animals; D002490:Central Nervous System / Q000502:physiology; D004177:Dipyrone / Q000494:pharmacology; D004361:Drug Tolerance; D005260:Female; D008297:Male; D009020:Morphine / Q000494:pharmacology; D009277:Nandrolone / Q000009:adverse effects / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D012726:Sexual Behavior, Animal / Q000187:drug effects*; D013375:Substance Withdrawal Syndrome; D019966:Substance-Related Disorders
chemical_list: D018712:Analgesics, Non-Narcotic; D000701:Analgesics, Opioid; D004177:Dipyrone; D009277:Nandrolone; D009020:Morphine