Generic finasteride vs Propecia effectiveness? Recent study worries me.

The generic should be the same formula as the name brand due to FDA controls. If you're not satisfied with your results, I recommend getting a formal consultation with a hair loss expert. PRP and progesterone injections and/or hair transplant are great alternatives. Best, Dr. Emer

The FDA is quite strict on generic medications and there is little variability between the two. This is for medications that are produced in the USA. If the medication comes from overseas or outside the USA, there may be higher variability. You should ask your pharmacist at the place where you fill your prescription, you may be surprised where your generic finasteride is coming from. 

The article you refer to is not a study but a collection of thoughts from a couple of colleagues who are also members of the ISHRS. Both medications have the same ingredient "finasteride". I am glad you are doing your research. Finasteride if you purchase it in the USA is the same medication as Propecia and should work exactly the same.