I've been prescribed Flucloxacillin after hair transplant - 3 weeks post op: will it harm the grafts?

Hello doctors, I had a hair transplant 3 weeks ago and am now experiencing some small pimples in the recipient area. I've been told to take Flucloxacillin 500mg 4X a day for 7 days. I haven't heard of this specific antibiotic being prescribed to other hair transplant patients before. So my question is, can it affect the survival and growth of the transplanted grafts or have any other negative effect on the final result of my hair transplant? Thanks in advance for your replies. All best, J.