That’s why your losing ground, I know my close friend had the same issue recently he used legit brand Merck and the clinic started giving him generic version after 3 years. Than he started shedding and losing ground, he recently went back on the first brand he started Merck Propecia and his shedding plus hairloss has stopped. This seems to be the case I have seen over the years and helped many people, as some lose ground when they switch brands.
I would go back on the original brand you used for years and see, in regards to Dutasteride NO as I left this and RU58841 as last options. I have tried RU which is more powerful and did work but gave me sexual sides......