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|pagetype = Drugs
|pagetype = Drugs
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These chemotherapeutic agents are selectively toxic pharmaceutical compounds that aid in parasite control without damage to the host. They are selectively toxic as they have greater affinity to the parasite target site than a similar site in the host. The drugs here are all used for activity against the different classes of helminths but some also have activity against ectoparasites and are known as '''endectocides'''.
These drugs as usually formulated so that they can be administered orally (in drench, tablet or in feed form), by injection or percutaneously (as a pour on). In cattle production intraruminal delivary systems or '''rumen boluses''' have been de