It\'s all sterile. They take a connector that looks like a Y. They put the syringes from 10% and 30% in the 2 top parts of the Y and alternate / simultaneously fill a new sterile syringe with what would be 20% as it gets mixed when it goes into the new syringe. I am not sure how willing they are to still do it or what, but that\'s how it\'s mixed. It\'s not in a bowl with a spoon or anything
Antibiotics most likely have no affect on gains, but Cipro is notorious for side effects, and I think that is what they have given in the past. Cephalexin is a common pre-op antibiotic. Doxycycline (version of tetracycline so don\'t get a sunburn) can be used if you\'re allergic or have issues with cephalosporins (cephalexin).