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What are the side effects of olanzapine?

Olanzapine can cause side effects, some of which may be serious. You also should seek emergency medical attention or talk to your doctor right away if you experience any of the following side effects while taking olanzapine:
  • symptoms of an allergic reaction, including breathing difficulty, hives, rash, itching, or swelling in your face, lips, tongue, or throat
  • seizures
  • stiff or rigid muscles
  • excessive sweating
  • rapid, irregular, or slow heartbeat
  • faintness or wooziness
  • tremors, twitching, or uncontrollable movements of your lips, tongue, eyes, face, arms, or legs
  • swallowing difficulty
  • loss of appetite
  • dry mouth
  • unusual thirst
  • feeling very hot, with or without sweating
  • urinating less than usual or not at all
  • symptoms of high blood sugar, which include nausea, vomiting, loss of appetite, fruity breath odor, thirst, increased urination, drowsiness, and dry skin
  • sudden weakness or numbness
  • vision problems
  • speech problems, such as having trouble speaking
  • problems with your balance
  • flu-like symptoms, such as fever, chills, body aches, or sores in your mouth and throat
  • confusion
  • changes in your personality, including unusual behavior or thoughts
  • hallucinations
  • thinking about hurting yourself
  • upper stomach pain
  • dark-colored urine
  • clay-colored stools
  • yellowing of your eyes or skin
  • swelling of your arms, hands, feet, ankles, or lower legs
Other potential side effects may be bothersome but are less likely to be serious. These include:
  • constipation
  • loss of bladder control
  • increased appetite
  • weight gain, especially in adolescents
  • increased blood levels of cholesterol and triglycerides, especially in adolescents
  • stomach pain
  • headache
  • dizziness
  • drowsiness
  • restlessness
  • depression
  • problems with your memory
  • sleeping problems, such as difficulty falling or staying asleep
  • weakness
  • dry mouth
  • pain in your legs, arms, back, or joints
  • numbness or tingling
  • breast swelling or nipple discharge in both men and women
  • missed menstrual periods
Talk to your doctor if these side effects are severe or won't go away.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.