I respond very poorly to antiandrogens. I get erectile dysfunction, which I am already prone to because I take an SSRI (like Prozac). At 100 mg of RU, I get some erectile dysfunction, but it is no where near as bad as 1 mg of Finasteride. Because of this, I now apply 50 mg of RU a day. The side effects at 50 mg of RU are very slight, if they exist at all.
Regarding regrowth, I have been using minoxidil, RU, OC, Nizoral, Castor Oil, and dermameedling for the last 3-4 months. Recently, I have noticed several new, shorter hairs at my hairline. I haven't posted about this yet, because I want to be sure (and with good pictures) before I do.