I had - or better - still having a psychotic episode and therefore started taking Amisulpride about 5 weeks ago. Right from the start I gained 10 lbs. 3 weeks after starting, it was already 20 lbs. Now it seems to have peaked (hopefully) but I’m disgusted. 
I think it is safe to say that this weight gain is not due to over eating since I didn’t do that and also this would be even hard to accomplish when over eating. 
Has anyone also encountered this side effect - maybe even with said Amisulpride? Did the issue resolve itself or how did you proceed?