Right now I'm switching to geodon at a low dose and slowly raising it and it doesn't make me tired at all! It is to early to know if weight gain will be a side effect, but zyprexa whih I was on before caused me to gain 15 lbs in 2 months when I was still eating well and exercising, and I was also constantly tired.
It's important to have an open dialogue with your doctor about side effects and hopefully they will help find you one with the least side effects and most benefits!