Olanzapine
"This drug makes you gain a ridiculous amount of weight in just a few days. 
I've been taking zyprexa for 2 months and gained almost 9kg. It's terrible because of its side effects. As someone who was just at the right weight for my height I'm afraid I'll not stop gaining weight and my borderline and depression will get worse. I feel self conscious about my body now, I feel fat and my anxiety is also getting worse. Sadly I can't recommend this medication."