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Wikipedia says that the half life of Aspirin effectiveness is variable depending on the kidneys, pregnancy, dosage, etc. In a heathy individual it should take about 4.9 hours for the effectiveness to be cut in half.

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14y ago
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13y ago

acetylsalicylic acid can have a very long shelf life (years) if stored dark, dry, and cool.

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Q: How long is the shelf life of aspirin?
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