Have my second round of Kybella tomorrow, I'm getting over a sinus infection and on Z pack (Day 2 of 5) Is it safe to proceed?

I do not think that there would be any problem having your second Kybella treatment as you are recovering from a sinus infection.  There should not be any safety issue but there certainly would not be any problem to wait a longer period of time if you do not feel up to it at the moment.  

Thank you for the question.   I think that it should be fine that you have Kybella while on antibiotics, as the two treatments should not interfere with one another.  That said, I do not like doing elective, cosmetic procedures or injectables in anyone that has any form of illness, as the off chance that there is some unforeseen interaction makes me hesitant to offer it.  I prefer that my patients are healthy at the time of injection, though I think that most providers would offer it and leave it up to the patient.  Good luck!