Risk of Switching from Propecia to Generic Finasteride After 25 Years on Propecia?

[kvsocal]

Hi - I have been on Propecia for 25 years, since I was 19. While I have never perceived new growth, my loss has been very minimal over the 25 years. I am highly concerned about switching to generic due to risk of losing 25 years of progress since I understand that if you stop taking Propecia you lose all cumulative benefit. Any guidance on studies or otherwise about potential risks associated with switching? I know the active ingredient is the same, but even if there is only a 2% chance of a problem I would not make the switch. Thank you for your thoughts on this.