Judgment call: Usual dose of Macrobid for UTI is 100mg 2x a day for 7 days. When UTI comes back soon after, it may be an incompletely treated UTI or it may be a new uti. 2 days after, it is likely incompletely treated so number of days should be increased, but i wouldn't increase the dose above recommended. If new uti, the new bug may be resistant. If you have low kidney function, Macrobid isn't as effective.
Answered 4/16/2016
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