Can over-application of Minoxidil kill transplanted hair?

It is best to ask your surgeon about post operative care as each doctor has their unique regimen.  Minoxidil does not harm transplanted hairs.

Thank you for your question. I suggest that you move forward and consult with a board certified facial plastic surgeon.
Best wishes,

Hello. Thank you for your question! Minoxidil should not cause death to the hair follicles, I advice to my patients apply minoxidil 5% not earlier than 3 weeks post operative. Minoxidil may let you have some itching, but this would feel even person who did not have hair transplant.