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Hello I'm Dr Chip.
Yes--finish out the course of the zithromax since it's not too late to get the full benefit of the antibiotic
And it basically covers your for ten days so give it a little more time to work on the sinus infection
Please let me know if you need any more information
Finish it off and give it another two days after you do
If it's not completely cleared by then you'd need a course of Cipro or Augmentin