What antibiotic is safe to treat a PPID/IR horse with a sinus infection?

She has a discharge from her right nostil, no fever, lungs OK, and she's eating well - and she's a picky eater. Years ago she was briefly on metronidazole but colicked badly so that's out. Three months ago she had a broken tooth removed from her right upper arcade, not sure if that's the cause of this problem or not. Is uniprim OK?


Kathy & Crimson (29 yr old chestnut TB mare, PPID) & Sunny (29 yr old liver chestnut Morgan mare, IR)
Lancaster, MA
Joined March 2011
Crimson's case history:

Sunny's case history:


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