eli5 Why can’t we just take a pill to deal with blood sucking pest like lice, bedbugs etc

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Like it’s their food. Just poison the supplies and they die out. Of course I don’t think it’ll take much, and we humans should be fine with it. It just makes too much sense

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Oral ivermectin actually does work against lice. Generally though, topical medications or mechanically killing bugs is safer and more effective. It’s also difficult to make drugs that harm bugs and not humans in part because we’re more similar to bugs (an animal) than we are to say bacteria.

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