I just finished my first pack of Sronyx. The side effects I experienced were frequent of spotting the first 10 days, very tender (GIANT) breasts, and increased anger and irritability.
The spotting was annoying, just because it felt like my period took extra long 10 days longer) to go away. As for my breasts, they got so much bigger that my friends started to ask about it. I didn't gain weight anywhere else though, which I'm happy about. I've also been getting irritated and angry a lot, which is very strange because I usually it takes a lot to get me upset. For instance, I got really really angry because my boyfriend and I were having a conversation and I thought he was talking too much. Usually I'm extremely easy going, I really enjoy listening and I would never notice something like that..
Anyway, my doctor said that the spotting will probably stop after a few more packs. I'm going to keep trying it out and see if these side effects lessen as my body gets used to the drug.