A female asked:
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how long does macrobid stay in your system after taking the last dosage?

1 doctor answer
Dr. Nayana Trivedi
38 years experience Internal Medicine
24hours: Half life is 12 hours. That means the half of the total dose taken will be gone after 12 hours and then another 12 hours 50% from the other half will be gone and so forth.
Answered on Mar 15, 2020

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A 28-year-old female asked:
Dr. John Chiu
Dr. John Chiu answered
56 years experience Allergy and Immunology
Unusual reaction: I would double that this is from macrobid, certainly not typical for allergic reactions.

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