Olanzapine

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat. Stop using olanzapine and call your doctor at once if you have any of these serious side effects:

very stiff (rigid) muscles, high fever, tremors, sweating, confusion, fast or uneven heartbeats, slow heart rate, feeling like you might pass out;

twitching or uncontrollable movements of your eyes, lips, tongue, face, arms, or legs;

trouble speaking or swallowing;

dry mouth, thirst, feeling very hot (with or without sweating), urinating less than usual or not at all;

high blood sugar (increased thirst, loss of appetite, fruity breath odor, increased urination, drowsiness, dry skin, nausea, and vomiting);

sudden numbness or weakness, confusion, or problems with vision, speech, or balance;

fever, chills, body aches, flu symptoms, sores in your mouth and throat;

swelling in your hands or feet;

changes in personality, unusual thoughts or behavior, hallucinations, or thoughts about hurting yourself; or

upper stomach pain, itching, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).

Less serious side effects may include:

weight gain (more likely in teenagers), increased appetite;

headache, dizziness, drowsiness, feeling tired or restless;

memory problems;

stomach pain, constipation, loss of bladder control;

back pain, pain in your arms or legs;

numbness or tingly feeling;

breast swelling or discharge (in women or men); or

missed menstrual periods.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.