Zyprexa and other antipsychotic medications can cause serious problems such as:
- A life-threatening nervous system problem called neuroleptic malignant syndrome (NMS). NMS can cause a high fever, stiff muscles, sweating, a fast or irregular heart beat, change in blood pressure, and confusion. NMS can affect your kidneys. NMS is a medical emergency. Call your healthcare professional right away if you experience these symptoms.
- A movement problem called tardive dyskinesia (TD). Call your healthcare professional right away if you get muscle movements that cannot be stopped.
- High blood sugar and diabetes. Patients with diabetes or who have a higher chance for diabetes should have their blood sugar checked often.
- Strokes have happened in older patients treated for mental illness from dementia. Zyprexa is not approved for this use.
- Other serious side effects include low blood pressure seen as dizziness, and possibly fainting; increased heart beat; seizures; liver problems; increased body temperature; and difficulty swallowing.
- The most common side effects include sleepiness, dry mouth, dizziness, restlessness, constipation, upset stomach, weight gain, increased appetite, and tremor.