The effect of thiabendazole on pain threshold

Area of Science:

• Pharmacology
• Toxicology
• Pain Management

Background:

• Thiabendazole is an anthelmintic drug.
• Its potential analgesic effects are not well-established.
• Morphine is a known opioid analgesic.

Purpose of the Study:

• To investigate the antinociceptive properties of thiabendazole.
• To evaluate the interaction between thiabendazole and aspirin on pain relief and toxicity.
• To assess the effect of thiabendazole on morphine-induced analgesia.

Main Methods:

• Assessment of reaction time to thermal stimulus in mice.
• Determination of the median effective dose (ED50) against p-benzoquinone-induced writhing reflex.
• Evaluation of median lethal dose (LD50) in toxicological studies.
• Combination studies with thiabendazole and aspirin at various doses.

Main Results:

• Thiabendazole significantly increased reaction time to thermal stimulus, indicating antinociceptive action.
• The ED50 of thiabendazole against writhing reflex was 310 mg/kg, compared to aspirin's 140 mg/kg.
• Aspirin (140 mg/kg) combined with 300 mg/kg thiabendazole reduced aspirin's ED50 to 50 mg/kg.
• Oral LD50 for thiabendazole was 2200 mg/kg; combined with aspirin, it decreased to 900 mg/kg.
• Morphine-treated mice showed no difference in reaction time when co-administered with thiabendazole.

Conclusions:

• Thiabendazole exhibits significant analgesic activity.
• Aspirin potentiates the analgesic effects of thiabendazole.
• Aspirin markedly increases the toxicity of thiabendazole.
• Thiabendazole does not alter morphine's effect on pain response.