FazaClo Side Effects

The drug clozapine is marketed in the United States with several brand names, including FazaClo. The Mayo Clinic states that this medication typically is prescribed for people who suffer from schizophrenia if other medications have not been effective. Because of potential blood problems with FazaClo, people who take it typically have blood-test monitoring done weekly for a minimum of six months. In addition, FazaClo may cause some serious common side effects that should be reported to a psychiatrist or physician immediately.

Blurry Vision

Taking FazaClo may lead to an inability to focus vision on objects and people. This side effect may affect either vision close up or far away, or both.


Taking FazaClo can drop a person’s blood pressure, a condition called hypotension. Sudden low blood pressure can cause fainting, dizziness and fatigue. Low blood pressure that develops over a few days may cause lapses in memory and, potentially, brain damage because not enough oxygen is reaching the brain and other parts of the body. Fainting also may occur when the person taking FazaClo rises from a prone or sitting position, Drugs.com states. This is not categorized as a serious side effect and should disappear in a few days.

Heart Rate Problems

Arrhythmias, or problems in the normal heart rate, may occur in a person taking FazaClo. For example, she may experience tachycardia, a condition in which the heart beats more than 100 times each minute during periods of inactivity. This may be accompanied by palpitations, which are pounding heartbeats. Both of these problems mean the patient’s blood pressure also is raised. Her heartbeat may be irregular, meaning it may skip a beat.

Motion Difficulties

FazaClo may cause bodily motion problems such as shakiness in the feet, hands, arms or legs. A patient also may experience trembling in his feet or hands. These problems may be accompanied by an abnormal weakness and tiredness throughout the body.


Because FazaClo is working to make the schizophrenic’s brain function more rationally, its actions may cause other problems the brain. The most commonly reported such side effect is mental confusion. This may mean the patient does not understand a conversation or cannot make sense of normal things such as driving a car or what day it is.

About this Author

Carole Anne Tomlinson has been a registered nurse working in a variety of medical environments for more than 25 years. She now serves as the nursing supervisor for a chemical dependency facility. She has also written numerous articles for a variety of websites.