A member asked:

How long does macrobid stay in your system after taking the last dosage?

A doctor has provided 1 answer
Dr. Nayana Trivedi answered

Specializes in 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 6/21/2021

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