About This Drug
Olanzapine is a medication that is used with some chemotherapy drugs to prevent nausea and vomiting (throwing up) during treatment. It is also used for psychiatric disorders in larger doses and for a longer duration of time. It is given orally (by mouth) when used during chemotherapy, but also can be given intramuscularly (IM) when used for other uses.
Possible Side Effects
- Extreme tiredness or feeling sleepy
- Feeling dizzy
- Feeling restless
- Low Blood Pressure. You may feel dizzy
- Weight gain
- Increased appetite (increased hunger)
- Dry mouth
- Constipation (unable to move bowels)
Note: Not all possible side effects are included above.
Warnings and Precautions
- Elderly patients with dementia are at an increased risk of life-threatening events.
- This drug may cause a serious condition called neuroleptic malignant syndrome which is rare. Symptoms may be confusion, fever, muscle stiffness, increased sweating and/or fast heartbeat.
- Increase in your cholesterol and triglycerides level
- Blood sugar levels may change. If you have diabetes, changes may need to be made to your diabetes medication.
- Bone marrow depression. This drug may cause a decrease in white blood cells. This may increase your risk of infection.
- This drug can very rarely cause a severe skin reaction. Symptoms include fever and rash or swelling. Contact your medical team right away if you have these symptoms.
- Tardive dyskinesia: unusual and/or involuntary movements such as lip smacking, grimacing and/or eye blinking. This is very rare and may rarely be permanent.
- This drug may cause unusual thinking or altar your decision making.
- Seizure. This is very rare in smaller doses of olanzapine. Common symptoms of a seizure can include confusion, blacking out, passing out, loss of hearing or vision, blurred vision, unusual smells or tastes (such as burning rubber), trouble talking, tremors or shaking in parts or all of the body, repeated body movements, tense muscles that do not relax, and loss of control of urine and bowels. There are other less common symptoms of seizures. If you or your family member suspects you are having a seizure, call 911 right away.
Note: Some of the side effects above are very rare. If you have concerns and/or questions, please discuss them with your medical team.
- This drug may impair your ability to drive or use machinery. Use caution and tell your nurse or doctor if you feel dizzy, very sleepy, and/or experience low blood pressure. Avoid alcoholic beverages.
How to Take Your Medication
- Swallow the medicine with or without food daily.
- Missed dose: If you vomit or miss a dose, take your next dose at the regular time. Do not take 2 doses at the same time, instead, continue with your regular dosing schedule and contact your physician.
- Storage: Store this medicine in the original container at room temperature and protect it from light. Do not store in the bathroom.
Treating Side Effects
- If you are dizzy, get up slowly after sitting or lying.
- Ask your doctor or nurse about medicines that are available to help stop or lessen constipation.
- If you are not able to move your bowels, check with your doctor or nurse before you use enemas, laxatives, or suppositories.
- Drink plenty of fluids (a minimum of eight glasses per day is recommended).
- If you have diabetes, keep good control of your blood sugar level. Tell your nurse or your doctor if your glucose levels are higher or lower than normal.
- Manage tiredness by pacing your activities for the day.
- Be sure to include periods of rest between energy-draining activities.
- To decrease infection, wash your hands regularly.
- Avoid close contact with people who have a cold, the flu, or other infections.
- Take your temperature as your doctor or nurse tells you, and whenever you feel like you may have a fever.
Food and Drug Interactions
- There are no known interactions of olanzapine with food, however you should avoid alcohol while taking olanzapine.
- Check with your doctor or pharmacist about all other prescription medicines and dietary supplements you are taking before starting this medicine as there are known drug interactions with olanzapine. Also, check with your doctor or pharmacist before starting any new prescription or over-the-counter medicines, or dietary supplement to make sure that there are no interactions.
When to Call the Doctor
Call your doctor or nurse if you have any of these symptoms and/or any new or unusual symptoms:
- Fever of 100.5 F (38 C) or higher
- Fast heartbeat
- Feeling dizzy or lightheaded
- Fatigue that interferes with your daily activities
- Headache that does not go away
- Extreme tiredness or feeling sleepy
- Muscle stiffness
- Fever with rash or swelling
- Unusual and/or involuntary movements such as lip smacking, grimacing and/or eye blinking
- No bowel movement in 3 days or when you feel uncomfortable
- Abnormal blood sugar
- Unusual thirst, passing urine often, headache, sweating, shakiness, irritability
- Weight gain of 5 pounds in one week
- Symptoms of a seizure such as confusion, blacking out, passing out, loss of hearing or vision, blurred vision, unusual smells or tastes (such as burning rubber), trouble talking, tremors or shaking in parts or all of the body, repeated body movements, tense muscles that do not relax, and loss of control of urine and bowels. If you or your family member suspects you are having a seizure, call 911 right away.
- If you think you may be pregnant.
- Pregnancy warning: It is not known if this drug may harm an unborn child. For this reason, be sure to talk with your doctor if you are pregnant or planning to become pregnant while receiving this drug. Let your doctor know right away if you think you may be pregnant.
- Breastfeeding warning: Women should not breast feed during treatment because this drug could enter the breast milk and cause harm to a breast feeding baby.
- Fertility warning: Human fertility studies have not been done with this drug. Talk with your doctor or nurse if you plan to have children. Ask for information on sperm or egg banking.
New December 2017
This information is intended to provide helpful health information to the general public and is not to be used in place of any medical, health, psychological, or any other kind of personal professional services. The information herein does not cover all possible uses, actions, precautions, side effects, or interactions of the medicines mentioned, nor is the information intended as medical advice for individual problems or for making an evaluation as to the risks and benefits of taking a particular medication. The dose, method of administration and contraindications for any administered medication should be confirmed before use. UPMC specifically disclaims all responsibility for any liability, loss or risk, personal or otherwise, which is incurred as a consequence, directly or indirectly, of the use and application of any medication mentioned herein.