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clinicalcorrelations.org
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TIL Low-dose Aspirin comes in 81 mg because prior to the Metric system, England in the Middle Ages used an apothecary system of weights, with the base weight derived from 1 grain of barleycorn. Adult Asprin dosage was 5 grain (325 mg), with a low-dose one-quarter portion being 1.25 grain, or 81 mg.