I'm not one for using medication but due to long work hours and always being intimate very late in the evenings, 1 to 2 out of 10 times I was able to attain an erection, please my partner but when it came time for me, I suddenly could not keep the erection which was frustrating for me. Having now tried the 50 mg, I have been happy and feel like I have my sex drive back because I'm able to have strong erections without too much worry even when not with my partner. Now I have received different colored pills all at 50 mg and the white pills seem to flush me more than the smaller blue pills. I just ordered the 100 mg but these are much larger blue pills so I wish there was more consistency in the same pill each time I re-order.