Common side effects

• Hyperprolactinemia
• Hypertriglyceridemia
• Personality disorders
• Parkinsonism
• Toxic amblyopia
• Orthostatic hypotension
• Rhinitis
• Xerostomia
• Constipation
• Back pain
• Drowsy
• Dizziness
• Fatigue
• General weakness
• Tremor
• Akathisia
• Weight gain
• Increased appetite
• Headache disorder
• Disturbance of attention

If any of these effects persist or worsen, tell your doctor or pharmacist promptly

• Drowsiness
• Dizziness
• Lightheadedness
• Stomach upset
• Dry mouth
• Constipation
• Increased appetite
• Weight gain

Tell your doctor right away if you have any serious side effects, including

• Difficulty swallowing
• Shaking
• Slow heartbeat
• Fainting
• Mental/mood changes
• Numbness/tingling of arms/legs
• Yellowing eyes/skin
• Severe stomach/abdominal pain
• Trouble urinating
• Interrupted breathing during sleep

Get medical help right away if you have any very serious side effects, including

• Seizures

This medication may rarely cause a very serious condition called neuroleptic malignant syndrome . Get medical help right away if you have any of the following symptoms

• Fever
• Muscle stiffness/pain/tenderness/weakness
• Severe tiredness
• Severe confusion
• Sweating
• Fast/irregular heartbeat
• Dark urine
• Signs of kidney problems

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including

• Fever
• Swollen lymph nodes
• Rash
• Itching/swelling
• Severe dizziness
• Trouble breathing

Other things to note

• Dizziness and lightheadedness can increase the risk of falling. Get up slowly when rising from a sitting or lying position.
• This drug may rarely make your blood sugar rise, which can cause or worsen diabetes. Tell your doctor right away if you have symptoms of high blood sugar such as increased thirst/urination. If you already have diabetes, check your blood sugar regularly as directed and share the results with your doctor. Your doctor may need to adjust your diabetes medication, exercise program, or diet.
• This drug may also cause significant weight gain and a rise in your blood cholesterol levels, especially in teenagers. These effects, along with diabetes, may increase your risk for developing heart disease. Discuss the risks and benefits of treatment with your doctor.
• Olanzapine may rarely cause a condition known as tardive dyskinesia. In some cases, this condition may be permanent. Tell your doctor right away if you develop any unusual/uncontrolled movements .
• This medication may increase a certain natural substance made by your body. For females, this increase in prolactin may result in unwanted breast milk, missed/stopped periods, or difficulty becoming pregnant. For males, it may result in decreased sexual ability, inability to produce sperm, or enlarged breasts. If you develop any of these symptoms, tell your doctor right away.