This was in 2011 so that's quite some time ago. But I think around 2-4 weeks. I guess similar to the first time I had shedding. I switched to Proscar. I remember that with the second shedding I lost most gains that I achieved with the 6 months 1mg capsules. Don't keep switching brands. I think it's important for your health (and to achieve a long-term steady max. result) that you keep the testosterone and DHT in your body at a constant level. I'm not a doctor, but I have been using finasteride with success for 6 years I think after 1-1.5 years using finasteride (6 months capsules, the rest Proscar) I reached my max. and I have kept it that way until now without any fluctuations in my hair health. Sure, I believe your lifestyle is also important: eat healthy, exercise, try to sleep enough, and no stress. Then you can achieve its max. potential.