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A member asked:
How long does penicillin stay in your system?
A doctor has provided 1 answer
About 24 hours : Penicillin is an antibiotic with a short half-life, about four hours. If you take 500 mg at noon, 250 mg is still there at 4 pm, 125 mg at 8 pm, 62 mg at midnight, etc.
Answered 12/27/2020
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