7.5 months on propecia. Shedding 200 hairs/day. How common is it for finasteride to not work, in your clinical experience?

This is not uncommon as finasteride does not always work to stop hair loss.  Speak with your doctor about building a Master Plan for your future haunt loss problems

Finasteride (Propecia) works well to reverse hair loss in the crown and works in the frontal area in only a few patients. You need a workup and a correct diagnosis from a dermatologist to detemine if your hair loss is due to pattern balding or some other cause.