Is it likely that i will gain weight if i start a dose of 25mg valdoxan , thank you ?

Uncertain: There are not enough studies upon which to base a concise response to our question. In various studies, the drop-out rate for all side effects was less than with several other antidepressants. If you are concerned, discuss with your MD and set a threshold, say 7 pounds, that will prompt a discussion and review of the treatment choices.