What side effects can this medication cause?

Pending revision, the material in this section should be considered in light of more recently available information in the MedWatch notification at the beginning of this monograph.

Olanzapine may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:

• drowsiness
• dizziness
• restlessness
• unusual behavior
• depression
• difficulty falling asleep or staying asleep
• weakness
• difficulty walking
• constipation
• weight gain
• dry mouth
• pain in arms, legs, back, or joints

Some side effects can be serious. If you experience any of the following symptoms or those listed in the IMPORTANT WARNING section or the SPECIAL PRECAUTIONS section, call your doctor immediately:

• seizures
• changes in vision
• swelling of the arms, hands, feet, ankles, or lower legs
• unusual movements of your face or body that you cannot control
• fever
• very stiff muscles
• excess sweating
• fast or irregular heartbeat
• rash
• hives
• difficulty breathing or swallowing

Olanzapine may cause other side effects. Call your doctor if you have any unusual problems while taking this medication.

If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program by phone 1-800-332-1088.