Scalability is one reason. It would take a **lot** of medicine to dose everyone in the world.
Also, a lot of parasites can survive off more than one type of host. Bedbugs, for example prefer humans but can survive just fine off dogs and cats. You’d have to dose all of those as well, including the feral ones, to be sure of eradicating bedbugs
You want to run your blood into poison? With a ton of research, maybe we could develop something that turns your blood poisonous to those bugs but not to your body, sure, but what would be the point of investing all that time/money (while conducting potentially unethical experiments) when we already have a way to deal with those bugs?
Ok, but how would this pill would work? The pill would have to deliver into your body something that can kill insects in tiny amounts of blood without being toxic to us at all. You seem to think it’s trivially easy find such a compound which is not at all correct. Also, what’s the point? We already have effective means of eliminating bed bugs and lice.
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