If alcohol is so effective at killing bacteria/viruses, why isn’t it used more often in medication?

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Concentrated alcohol is effective at killing bacteria and viruses, by doing 2 things: it dries them out by seeping in and flushing out the water inside (then evaporating and leaving a dried out collapsed bacterium / virus), and also as a solvent, damaging the membrane / envelope of the bacteria / virus.

It can’t do that in medication to take internally because it needs to be concentrated alcohol, and a person would die of alcohol poisoning long before the amount of alcohol in their blood was enough to have any effect at all on viruses and bacterial.

You can make things that you can spread on external wounds that include alcohol. That’s what rubbing alcohol is, part alcohol and water. That can have some effect.

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