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This is a vestige of the old system of measuring medications in grains.

Follow the math,

1 grain = 64.79 mg

5 grains = standard aspirin dose = 323.99 mg or about our current dose of 325 mg.

When we started doing research on the efficacy of Aspirin; we found that for cardiac prevention half of the standard dose was effective (i.e. 162.5 mg).

Then we figured out that half of the new dose would also work or 81mg ....

This is at least the story that is passed down in medical school ... beware - half of what you hear in medical school is wrong, we just don't know which half ....

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15y ago
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15y ago

Baby aspiring is 81 mg because regular strength aspiring is 325mg, when you take half that dose you get the 162 mg strength, and half of that is about 81 mg. There's usually a rhyme or reason for every oddity in life.

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Q: Why is 81 mg and not 80 mg the aspirin dose for children?
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Is low dose aspirin the same as baby aspirin?

81mg is the common dosage for "baby" aspirin


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