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Pro-Karyote t1_j7wp06j wrote

It has to do with a unit of measurement we don’t currently use for dosing medications, called a grain. The full dose of aspirin was 5 grains, which is about 325mg. The low dose was a quarter of the full dose, so 1.25 grains (which is roughly 81mg). That was the dose that was on formulary, and since it falls within the low-dose range and it was the dose available, it stuck.

Brief overview of aspiring dosing history

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