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Carbachol interactions with nonsteroidal anti-inflammatory drugs
H F Miranda1, F Sierralta, G Pinardi
1Pharmacology Program, ICBM, Faculty of Medicine, University of Chile, Independencia 1027, Santiago 7, Chile. hmiranda@machi.med.uchile.cl
Canadian Journal of Physiology and Pharmacology
|February 5, 2003
Summary
Nonsteroidal anti-inflammatory drugs (NSAIDs) and carbachol show synergistic pain relief when combined. Central cholinergic pathways, not just prostaglandin inhibition, contribute to NSAID effectiveness.
Area of Science:
- Pharmacology
- Neuroscience
- Pain Management
Background:
- Nonsteroidal anti-inflammatory drugs (NSAIDs) analgesia is primarily attributed to cyclooxygenase inhibition.
- Cholinergic agonists are known to possess antinociceptive properties.
- The interaction between NSAIDs and the cholinergic system in pain modulation requires further investigation.
Purpose of the Study:
- To investigate the antinociceptive interactions between carbachol, a cholinergic agonist, and several NSAIDs.
- To determine if central cholinergic pathways contribute to the antinociceptive effects of NSAIDs.
Main Methods:
- Antinociceptive activity was assessed in mice using the acetic acid writhing test.
- Dose-response curves for NSAIDs and carbachol were established following intraperitoneal (i.p.) and intrathecal (i.t.) administration.
- Drug interactions were analyzed using isobolographic analysis after simultaneous administration of fixed ratios.
Main Results:
- Both NSAIDs and carbachol demonstrated greater potency when administered intrathecally (i.t.) compared to intraperitoneally (i.p.).
- Combinations of NSAIDs and carbachol showed supra-additive effects after i.p. administration and additive effects after i.t. administration.
- Atropine administration antagonized the synergistic antinociceptive effects observed.
Conclusions:
- Carbachol significantly modulates the antinociceptive activity of NSAIDs, suggesting a synergistic interaction.
- Central cholinergic pathways represent an additional mechanism, independent of prostaglandin synthesis inhibition, contributing to NSAID-induced analgesia.