Tioxidazole: evaluation of antiparasitic activity of a micronized formulation in horses by the critical test method.

This study examines the effectiveness of a micronized tioxidazole formulation in removing different parasites in horses. The findings suggest that the treatment effectively removes numerous parasites, though it was not effective against bots, tapeworms or stomach worms.

Research Background and Methods

• The research focuses on the benzothiazole compound, Tioxidazole, and its effectiveness as an antiparasitic drug for horses when administered in a micronized form.
• It was given to six horses in two different methods: it was fed directly to the stomach of three horses and mixed with the feed for the other three horses. This was done to examine the effectiveness and palatability of the drug when administered in different ways.
• The effectiveness of the Tioxidazole was evaluated using the critical test method, a widely used criterion in antiparasitic research that looks at the presence or absence of live parasites after the administration of the drug.

Key Findings

• The study found an “excellent removal” of different kinds of parasites from the horses treated with Tioxidazole. These parasites included Strongylus vulgaris, S edentatus, small strongyles, immature Oxyuris equi, and Parascaris equorum.
• The degree of removal varied from 88% to 100% depending on the specific type of parasite. One horse still had some Parascaris equorum present after treatment, but apart from this case, the drug was largely successful.
• Tioxidazole demonstrated no notable activity against bots, tapeworms or stomach worms, indicating it may not be effective for treating these types of parasites.
• The drug, when mixed with feed, was found to be palatable — the horses did not refuse to eat the feed mixed with the drug.
• Signs of toxicosis (illness due to poison or toxin) were not observed, indicating that the Tioxidazole was safe for the horses at the dosage rate used.

Implications and Future Research

• The findings of this study suggest that a micronized formulation of Tioxidazole could be a effective antiparasitic treatment for horses, particularly for Strongylus vulgaris, S. edentatus, small strongyles, immature Oxyuris equi and Parascaris equorum.
• However, due to its ineffectiveness against bots, tapeworms and stomach worms, further research might be necessary in order to make Tioxidazole a comprehensive antiparasitic treatment.
• Determining the optimal dosage rate and the potential long-term effects of treatment with Tioxidazole could be beneficial areas for further studies.