There’s two ways (ish) that antibiotics work. One is by actually killing bacteria, one is by preventing them from multiplying. If you take the kind that prevents multiplying it would be like putting them on birth control for a day and then they’d go back to making babies.
So let’s say you’re taking the kind that kills bacteria. The first problem is that higher dosages don’t necessarily translate to higher levels of medication in your blood, at a certain point your body just doesn’t absorb more.
Assuming that you could infinitely increase the dosage until the point that it immediately wiped out all susceptible bacteria: the problem is that you have wiped out all susceptible bacteria: which includes bacteria that you need to be healthy
Basically, the idea with antibiotics is just to slow the bacteria down enough that your immune system can kill them, on the assumption that your immune system knows which bacteria are harmful (which of course isn’t always the case)
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