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NOTE: This is an archived issue. The current issue of AgVetLink can be found at http://www.nzfsa.govt.nz/acvm/publications/agvetlink/
AgVetLink: Number 51, August 2005
Closantel
The ACVM Group has been advised that a letter was sent to veterinary practices by a third party alleging the closantel base in Q Drench (A9291) was largely ineffective. It is implied in the letter that this product will not treat Haemonchus contortus. The assumption is made that reduced absorption from the gut of closantel demonstrates that the closantel in Q drench is not effective and its use would promote anthelmintic resistance.
This is disputed and contradicted by data supplied to the ACVM Group in support of the registration. The assertion and the additional information provided with the letter to veterinary practices has been taken seriously by the ACVM Group and examined against the information held by the Group for the product.
Q Drench remains registered with claims for treatment of Haemonchus properly supported by clinical efficacy data.
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