Antinociception, tolerance, and physical dependence comparison between morphine and tramadol

H. F. Miranda, G. Pinardi

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82 Citations (Scopus)


The mechanism of action of tramadol includes the activation of opioid receptors, and the potential ability of the drug to induce tolerance and physical dependence has been evaluated in different animal species and humans. This work was designed to study the involvement of opioid receptors in the antinociceptive activity and the potential ability to develop tolerance, crosstolerance, and/or physical dependence of tramadol. The writhes induced by acetic acid administration was used as algesiometric test. After chronic administration of tramadol, tolerance was evaluated by measuring the antinociceptive activity, and physical dependence was measured by naloxone administration. Morphine was used as drug of comparison. The IP administration of tramadol produced a dose-dependent antinociception with an ED50 value of 7.82 ± 1.16 mg/kg, which was unchanged after chronic administration of either tramadol (39.1 or 100 mg/kg) or morphine (1.05 or 100 mg/kg). By contrast, the ED50 for morphine (0.21 ± 0.08 mg/kg) was significantly reduced only by chronic pretreatment with both doses of morphine (tolerance). Physical dependence was developed only in mice pretreated with morphine, as evidenced by the presence of jumps, wet-dog shakes, tachypnea, piloerection, seizures, diarrhea, and urination after the administration of naloxone (1 mg/kg). These findings suggest that the antinociceptive activity of tramadol in mice is due to activation of opioid and nonopioid mechanisms, and as opposed to morphine, is not likely to induce tolerance and physical dependence. Copyright (C) 1998 Elsevier Science Inc.

Original languageEnglish
Pages (from-to)357-360
Number of pages4
JournalPharmacology Biochemistry and Behavior
Issue number4
Publication statusPublished - 1998


  • Antinociception
  • Morphine
  • Naloxone
  • Tolerance physical dependence
  • Tramadol

ASJC Scopus subject areas

  • Biochemistry
  • Behavioral Neuroscience
  • Pharmacology


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