Was I lied to by the doctor’s office?

I called an office near here to discuss options to stop my hair loss. One being hair transplant and the other finasteride. They told me that finasteride is required before they even would let me consider a hair transplant. Which, fine with me, sounds fair. However, here’s where it seemed too good to be true. They told me that if I get a hair transplant and stay on finasteride, I’d keep 100% of whatever hair is transplanted on my crown and at least 80-90% of whatever is transplanted on my hairline. Is that true? They said it had something to do with how DHT affects those two areas. It felt a bit like a sales pitch but seemed a bit far fetched that finasteride would allow me to keep 100% of the hair on my crown. Can’t anyone confirm or deny that?

I have been doing hair transplants for 33 years, pioneering modern surgery, even FUE. After you get a crown hair transplant, if you are on finasteride, it is more likely than not that the native hair that is there will stay longer than if you were not on finasteride. That doesn’t mean that taking finasteride will guarantee that the native crown hair will not fall out in time, which is what will probably happen. Some doctors use salesmen to represent their communication with patients, and too often, these salesmen invent the science to meet their sales goals. The buyer must always be on guard, even in a doctor’s office.