How long does the shedding last when taking Propecia?

Finasteride (Propecia) shedding, when it happens, rarely lasts more than 2-3 months. To my knowledge, it is neither good nor bad. When it lasts more than 3 months, it usually is genetic balding not shedding from the finaasteride.

I often prescribe finasteride to young men who want it. This type of change (shown here) is not the usual impact I see but it does happen maybe in 10% of the young men I treat. It happened in my son who took the drug and reversed it in a year. It stayed reversed now 14 years later.