Will Finasteride Protect My Donor Hair?

I’m a diffuse thinner and if I keep losing all of my hair I’ll be fully bald on top and have hair left on my sides. I’d like to protect my donor hair and prevent it from turning into a dupa situation.  So will taking finasteride right now help hair all over the head or no?I do not have dupa. Just diffuse thinning

People either have DUPA or don’t have DUPA. Finasteride has no impact on the donor area, except if you have DUPA. It may reverse some of it in about 50% of patients with DUPA (Diffuse Unpatterned Alopecia).