I've literally just started on Olanzapine, 5mg, I started around three days ago. I've not felt any side effects, but I looked at the common side effects on
crazymeds and it says that the weight gain usually happens with high doses if you're on it long term.
But as with any medication, you can control the weight gain. It's not like you swallow the tablet and you suddenly gain five pounds. All it will do is increase your appetite, but you can manage that with a healthy diet.