Clozapine is associated with several potential side effects, some of which can be serious. Common side effects include drowsiness, dizziness, weight gain, and constipation [1][2]. Other reported side effects include increased heart rate, tremors, and drooling [3][4].
What are the most serious side effects of clozapine?
More severe side effects, though less common, require careful monitoring. These include agranulocytosis, a dangerous drop in white blood cells that increases the risk of infection [5]. Clofazimine can also cause myocarditis (inflammation of the heart muscle) and cardiomyopathy (disease of the heart muscle) [6]. Seizures are another potential risk associated with clozapine use [7]. Neuroleptic malignant syndrome, a rare but life-threatening reaction characterized by fever, muscle rigidity, and changes in mental status, can also occur [8].
How is clozapine monitored for side effects?
Due to the risk of serious side effects, particularly agranulocytosis, patients taking clozapine undergo regular blood monitoring [5]. This typically involves weekly blood tests for the first six months, then bi-weekly tests for another six months, and monthly tests thereafter, provided no abnormalities are detected [9].
When does the risk of side effects from clozapine typically emerge?
While side effects can occur at any time, some of the most serious, like myocarditis, often appear early in treatment, within the first few weeks to months [6]. Agranulocytosis typically develops within the first few months of therapy [5].
Are there alternatives to clozapine for treating schizophrenia?
Clozapine is generally reserved for individuals with treatment-resistant schizophrenia, meaning they have not responded adequately to other antipsychotic medications [10]. Other antipsychotic medications are available and may be used as first-line treatments [11].
Who manufactures clozapine?
Multiple pharmaceutical companies manufacture clozapine under various brand names, including Clozaril, Fazaclo, and others [1]. DrugPatentWatch.com provides information on the patent status of these drugs [12].