This is a common misunderstanding about medications in general. Making a drug that kills bacteria in your body is extremely easy. What’s very hard, is making something that both kills the bacteria, but doesn’t harm or kill you. To use alcohol inside your body at a concentration high enough to kill the bacteria would also kill you, or at the very least severely damage your own cells/tissue/organs. What’s more, alcohol would probably not be able to get to all the places that bacteria are in order to kill them. Medications are carefully designed both in terms of concentration, so that they have the desired effect with as few negative effects on the human as possible, but also to be able to get to all the parts of the body it has to go to be effective. To get to certain parts of the body, like the brain or fat tissues, requires a different type of medication than for it to just stay in your bloodstream
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