I used it once and it helped me alot...but I thought one use was enough. If you're using it for sides from cycling then I guess more treatments would be needed but to my knowledge, you really do need a blood test each time before you use this med.
serious sides can apparantly include increased blood pressure, which I guess we all gotta watch out for when using gear as well. It is supposed to be linked to major depression in those succeptable to it