Why do HT surgeons recommend their patients use Fin and Minox?

[greatjob!]

If you're talking about say a NW 5 who is having a transplant, I think you are, with zero hair on top, they recommend preventative meds to keep the sides and back from dropping into NW 7 territory. If the patient has sufficient donor it may be possible to give adequate coverage, but if their sides and back drop they will likely not have the donor to keep up. Remember with hair transplants there is absolutely no substitute for native hair, so the more you can hold on to the better.

And to the other issue, generally speaking the hair from the safe zone is immune to DHT, so the meds are not needed for the transplanted hair to grow. Rare occasions do exist where the patient has general thinning even in the donor, but most good doctors can spot that and will hopefully turn the patient away.