Best time to start Finasteride after hair transplant to prevent shock loss?

Greetings, Please see below.
Ways to minimize shock loss are as follows:
Improve recipient bed and donor area environment.  Make your recipient environment improved by addition of growth factors and/or PRP to help reduce incidence of shock loss to native hairs.Use of Rogaine and Propecia- can help miniaturized hair become more stable and less likely to fall out during procedure9xRobotArtas-  The latest version of the robot can make recipient sites and can determine angle of existing hair and help ensure that the angle will not damage existing hair.  Especially helpful in patients where you are transplanting hair to create densityMinimize anesthesia time and procedure time- We limit number of grafts to a safe number per session.  Extended anesthesia periods and harvest times can cause patients to have a higher chance of shock loss.  The 9x Robot harvests between 1000-1500 grafts per hour making it superior to previous additions and traditional FUE approaches.Best,
Anil Shah

You should ask your surgeon who performed you surgery about using Propecia. You generally start the medication BEFORE surgery if you're concered about shock hair loss.

Most of my patients begin taking Finasteride before their transplant procedure and continue taking it after their transplant. I suggest you speak with your doctor to discuss you taking it a lot sooner. 

When my patients are used to take Finasteride, I recommend them to keep on taking Finasteride before, during and after surgery. 

However, this does not always work and side effects may still occur.  So always make sure to discuss directly with your doctor.

The best time to start finasteride for a hair transplant to prevent shock loss is before you have the hair transplant (see video below)