Why is it necessary to consider the life cycle of helminths when choosing an anthelmintic?

Considering the life cycle of helminths when choosing an anthelmintic is crucial because different stages of a helminth's life cycle can exhibit varying susceptibility to treatment. Each stage—whether it's the egg, larval, or adult stage—can respond differently to anthelmintic agents. If treatment is administered during a stage that is resistant or less sensitive to the chosen drug, it may fail to eliminate the infection entirely.

For example, some anthelmintics specifically target adult parasites, while others are effective against larval stages. Therefore, to ensure the most effective treatment and resolution of the infection, it is important to administer the appropriate drug at the correct time that aligns with the specific life cycle stage of the helminth. This approach enhances the likelihood of successful parasite elimination and reduces the chance of recurrent infections.