Yes, it is possible to loose weight while on Zyprexa.

How long have you been taking Zyprexa? The side effects of Zyprexa are weight gain, increased blood sugar and diabetes.

Clozapine and Olanzapine (Zyprexa) are the two antipsychotics that cause the most significant amount of weight gain.

Obviously I am not your Psychiatrist but maybe you could explore other atypical antipsychotics with chemical properties not similar to INVEGA (like Risperdone). Abilify is a very popular choice nowadays.