Finasteride and hair transplants

If you have a hair transplant do you need to take Fin still? Or are the donor hairs usually resistant to hair loss?

You should keep in mind that male patterned hair loss is progressive and finasteride does two things when having a hair transplant: (1) it protects against shock loss from the transplant (the loss of most of the miniaturized hairs present at the time of the transplant and (2) it slows down the progressive nature of the hair loss better than any other drug.