well... I really hope it is gr for grain because I do not want to imagine someone taking an 81 grams aspirin! (pharmacy unit = I must admit I had to check for it, as I did not know it, and I work in Pharma
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and it really exist!)
on the other hand, you can find that 1 grain is something between 60 and 68.4 mg (depending on the source), which would mean however, that an 81 grains = aprox. 5000 mg which also makes no sense... unless you think of aspirin tablets the size of a cherry, and made for horses...
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