• Summary of Experimental Design of Clinical Trial Protocol The tumescent cefazolin study protocol is organized as follows. The tumescent cefazolin clinical study protocol will involve four adult volunteer subjects/participants. Each subject will participate in up to four (4) separate 12 to 24-hour investigative procedures at least one to two weeks apart. Concentrations of drugs in the solution of tumescent local anesthesia will be: lidocaine ≤ 1000 mg/L, epinephrine ≤ 1.0 mg/L, sodium bicarbonate 10 meq/L, cefazolin ≤ 1 gm/L with or without metronidazole 500mg/L . Maximum total cefazolin dose will be 1 gm. The maximum total metronidazole dose will be 500 mg. The maximum tumescent lidocaine dosage will be 20 mg/kg. TLA will be delivered into subcutaneous fat by peristaltic infiltration pump using blunt-tipped infiltration cannulas.