"i have only been on sronyx for a week and a half and i already feel as if i am gaining a large amount of weight. i took aviane for a year prior (i was off birth control in between aviane and sronyx for about a year) and found that i lost weight on that pill. i&#039;m wondering if weight gain is just an initial side effect of sronyx and that i&#039;ll eventually go back to my normal weight?"