I am on my second Prostanozol cycle. The main sides I have noticed are a little bit of redness in the eyes at times (people have asked me if I'm high), a little bit of joint pain (but these are hardly even mentionable). Also, I got increased acne for the first week or so but it seems that once your body gets used to the elevated hormone levels, it goes away. On the first cycle, I started at 100mg and eventually got up to 250mg. The sides are almost nonexistant but the gains are not the greatest. I noticed accelerated fat loss, awesome pumps, better strength/endurance and a little bit of lean muscle gain. Also, it really doesnt effect libido negatively, if anything, it goes up.