Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun A
broad-spectrum benzimidazole anthelmintic used againstgastrointestinal parasites .
Etymologies
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Examples
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However, resistance to two of the three dewormer drug classes -- benzimidazoles (i.e., fenbendazole and oxibendazole) and pyrimidines (i.e., pyrantel) has been documented, and there have been some early indications of resistance to macrocyclic lactones (ivermectin/moxidectin) on a few farms.
TheHorse.com News 2010
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In contrast, the FECRT 14 days after treatment was 100 per cent in the fenbendazole treated group, and more than 90 per cent in the small group of foals treated with pyrantel.
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However, resistance to two of the three dewormer drug classes -- benzimidazoles (i.e., fenbendazole and oxibendazole) and pyrimidines (i.e., pyrantel) has been documented, and there have been some early indications of resistance to macrocyclic lactones (ivermectin/moxidectin) on a few farms.
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They advise that instead of ivermectin, fenbendazole or pyrantel are now the drugs of choice for use against P. equorum.
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Only moxidectin or a five-day course of fenbendazole will deal with encysted strongyles.
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Only two drenches are known to do the trick against these encysted larvae - moxidectin at the above-mentioned dose rate of 0.4 milligrams per kilogram of horse; and the five-day course of fenbendazole at the rate of 10 millgrams per kilogram of body weight each day.
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On that basis, only the five-day course of fenbendazole will deal with migrating large strongyles and all the encysted stages of the small strongyle.
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The label will likely show the active ingredient as fenbendazole, oxfendazole or oxibendazole.
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The 10mg dose rate for fenbendazole applies only to younger horses, as this level is needed to kill the commonest ascarid, P. equorum.
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Some may opt for a double course of fenbendazole for young horses, but with a half-strength first dose at 5mg per kilogram of body weight.
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