In '02, when I was losing some due to propecia losing its effectiveness, I started taking avodart the week it came out. Around 6 wks later, I noticed my hair growing back to were it was prior to propecia losing its effectiveness. I did have seasonal shedding later down the road (1 year later), but it grew back and after the first few years of seasonal shedding, I don't have it now (maybe last 3 years, knock on wood). As to other sides, I didn't notice any when I made the switch.