Olanzapine is used to treat and prevent some mental health problems such as schizophrenia and bipolar disorder.
Olanzapine injection is given into a muscle by a health professional, usually every two to four weeks.
Very rarely, olanzapine can cause extreme sleepiness. Because of this, you will need to stay in the hospital or clinic for at least two hours after your injection.
If you miss an appointment for your injection, contact your health professional as soon as possible.
Some medicines available without a prescription may react with olanzapine including:
Tell your pharmacist or doctor about all medicines or treatments that you may be taking, including vitamins, herbal products (e.g. St John's wort, kava) or recreational drugs.
|Side Effects||Recommended action|
Fever, stiffness, sweating, confusion
Feeling restless, strange or uncontrolled movements, tremor
Fast or irregular heartbeat, chest pain, fainting
Symptoms of a blood clot including: sudden shortness of breath, swelling or pain in one leg
Prolonged erection (longer than four hours)
|Tell your doctor immediately|
Drowsiness, dizziness, tiredness or weakness, headache, anxiety
Dry mouth, blurred vision, constipation, trouble peeing
Peeing when you don’t want to
Changes in periods
Sore or enlarged breasts, breastmilk production
Less interest in sex, impotence
Pain, tenderness or redness at injection site
|Tell your doctor if troublesome|
If you notice any other effects, discuss them with your doctor or pharmacist.
This leaflet contains important, but not all, information about this medicine.
Prepared by the PILs Committee at Christchurch Hospital, Canterbury District Health Board, New Zealand. January 2020
For more general information about this sheet and its contents, see: What does a My Medicines sheet cover?
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My Medicines Patient Information Leaflets (PILs) contain important, but not all, information about the medicines they describe.
For more information about the sheets, see: What does a My Medicines sheet cover?
My Medicines is developed by a team at the Canterbury District Health Board. Our team is made up of doctors, pharmacists, and a non-medical person to help us keep to plain language. We also discuss our information with specialist health professionals or groups when needed