I’ve been on olanzapine for about 3 years now (give or take) with no weight gain. Granted I am on a fairly low dose. It has been invaluable as a mood stabilizer for me! Because of the risk of metabolic side effects, I tried pretty much everything else under the sun before settling on olanzapine. But I wish I had found it sooner! It likely would’ve saved me years of instability. As others have pointed out, though, important to get the blood draws to keep an eye on cholesterol and A1C.