Some side effects can include: akathisia (an inability to sit still), unusual/uncontrolled movements (tardive dyskinesia), constipation, headache, dizziness, lightheadedness, drowsiness, tiredness, restlessness, weight gain (more likely in teenagers), increased appetite, memory problems, stomach pain or upset, loss of bladder control, back pain, pain in your arms or legs, numbness or tingly feeling, breast swelling or discharge (in women or men), dry mouth, or missed menstrual periods.
Speak with your doctor or pharmacist for help managing any side effects that become too severe during your treatment with Zyprexa (Olanzapine).