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Hello, I'm Dr. Deb and will do my best to help you today.
If this were my patient, I probably wouldn't bother giving her one more dose since I don't necessarily see the advantage of doing so. It's quite possible that she did absorb at least some of the liquid ronidazole on the day that she vomited although we obviously can't entirely know for sure.
In any event, treating for 13 days is just as likely to be effective as treating for 14.
I hope this helps. Deb