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Assessment of Morphine-induced Hyperalgesia and Analgesic Tolerance in Mice Using Thermal and Mechanical Nociceptive Modalities
Published on: July 29, 2014
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Ascorbic Acid interaction with analgesic effect of morphine and tramadol in mice
Fatemeh Zeraati1, Malihe Araghchian1, Mohammad Hadi Farjoo1
1Department of Pharmacology, Hamedan University of Medical Sciences, Hamedan, Iran.
Anesthesiology and Pain Medicine
|October 8, 2014
Summary
Ascorbic acid combined with morphine or tramadol showed additive or synergistic effects on pain relief in mice. The interaction type depended on the dose, with lower doses exhibiting synergy.
Area of Science:
- Pharmacology
- Pain Management
- Drug Interactions
Background:
- Combining analgesics can enhance drug efficacy and therapeutic outcomes.
- Understanding drug interactions is crucial for optimizing pain management strategies.
Purpose of the Study:
- To investigate the interaction between ascorbic acid and the analgesics morphine and tramadol.
- To determine if combining ascorbic acid with these analgesics alters their pain-relieving effects.
Main Methods:
- Analgesic activity was assessed using the acetic acid writhing test in NMRI mice.
- Dose-response curves were generated for ascorbic acid, morphine, and tramadol alone and in combination.
- Effective doses (ED20, ED50, ED65) and interaction indices were calculated to quantify the effects.
Main Results:
- All tested drugs exhibited dose-dependent antinociceptive effects.
- Co-administration of ascorbic acid with tramadol or morphine resulted in additive effects at ED50 and ED65.
- Synergistic effects were observed at the ED20 level for both combinations.
Conclusions:
- Ascorbic acid interacts with morphine and tramadol, producing either additive or synergistic effects on antinociception.
- The nature of the interaction (additive vs. synergistic) is dependent on the dose level.
- The potency ratio suggests a different interaction profile between ascorbic acid/morphine compared to ascorbic acid/tramadol.
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