amiodarone vs clozapine
PlainMeds reviewed this comparison against our methodology in August 2026. It places FDA and CMS record fields side by side, without recommending either medication.
Side-by-side comparison of amiodarone and clozapine. Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
minor Known Drug Interaction
Drugs that cause QT prolongation include: specific antipsychotics (e.g., ziprasidone, iloperidone, chlorpromazine, thioridazine, mesoridazine, droperidol, and pimozide), specific antibiotics (e.g., erythromycin, gatifloxacin, moxifloxacin, sparfloxacin), Class 1A antiarrhythmics (e.g., quinidine, procainamide) or Class III antiarrhythmics (e.g., amiodarone, sotalol), and others (e.g., pentamidine, levomethadyl acetate, methadone, halofantrine, mefloquine, dolasetron mesylate, probucol or tacrolimus) [see Warnings and Precautions (5.9) ] .
Cordarone, Pacerone
Clozaril
Amiodarone (Pacerone) is a medicine used to treat life-threatening, irregular heartbeats. It helps to restore a normal heart rhythm when other medicines don't work or can't be used.
Versacloz is a medicine used to treat severe schizophrenia when other medicines have not worked. It can also help lower the risk of suicidal behavior in people with schizophrenia or schizoaffective disorder.
This medicine treats very fast, irregular heartbeats in the ventricles (lower chambers of the heart). It is used when these irregular heartbeats are life-threatening. It is also used when other medicines don't work well enough or cause too many side effects. This medicine is for adults.
Versacloz is used to treat schizophrenia in people who haven't responded well to other antipsychotic medicines. Schizophrenia is a mental illness that can cause hallucinations, delusions, and disorganized thinking. Versacloz can also help lower the risk of repeated suicidal behavior in people with schizophrenia or schizoaffective disorder who are at high risk.
Amiodarone affects the electrical signals in your heart. It slows down these signals, which helps your heart beat normally. This medicine can help prevent dangerous, fast heart rhythms.
Versacloz works by affecting certain chemicals in the brain. These chemicals, like dopamine and serotonin, are involved in mood, behavior, and thinking. By changing the levels of these chemicals, Versacloz can help reduce symptoms of schizophrenia and lower the risk of suicidal behavior.
- • Low thyroid levels (hypothyroidism)
- • High thyroid levels (hyperthyroidism)
- • Heart failure
- • Irregular heartbeats
- • Problems with the heart's natural pacemaker (SA node dysfunction)
- • Feeling sleepy
- • Dizziness
- • Headache
- • Shaking
- • Fast heart rate
- Dyspnoea 1,158
- Asthenia 975
- Fatigue 895
- Nausea 606
- Cough 597
- Neutropenia 18,655
- Hospitalisation 12,101
- Death 11,398
- Schizophrenia 4,547
- White Blood Cell Count Increased 4,444
This medicine can cause serious problems with your lungs, liver, and heart. Lung problems can be fatal. Your doctor will check your lungs with X-rays and breathing tests. Liver problems can also be fatal. Your doctor will check your liver with blood tests. This medicine can also make irregular heartbeats worse. You will likely start this medicine in the hospital where your heart can be monitored.
Versacloz can cause several serious side effects: * **Severe Neutropenia:** This means a dangerously low white blood cell count, which increases your risk of infection. You will need regular blood tests to check your white blood cell count. * **Orthostatic Hypotension, Bradycardia, and Syncope:** This means low blood pressure when standing up, slow heart rate, and fainting. These are most likely when you first start taking Versacloz or when the dose is increased. * **Seizures:** Versacloz can increase your risk of seizures, especially at higher doses. * **Myocarditis, Pericarditis, and Cardiomyopathy:** These are serious heart problems that can be fatal. Tell your doctor right away if you have chest pain, shortness of breath, or other heart-related symptoms. * **Increased Mortality in Elderly Patients with Dementia-Related Psychosis:** Elderly patients with dementia who take antipsychotic medicines like Versacloz have an increased risk of death.
This medicine can harm your unborn baby. It can cause thyroid problems, slow heart rate, and brain development issues. Do not breastfeed while taking this medicine.
Tell your doctor if you are pregnant or plan to become pregnant. Babies born to mothers who take Versacloz in the third trimester may have withdrawal symptoms or other problems after birth. There is a pregnancy registry for women who take atypical antipsychotics like Versacloz.
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How to Read This amiodarone vs clozapine Comparison
amiodarone is classified in the Class III Antiarrhythmic drug class, while clozapine sits within the Atypical Antipsychotic class. Drugs from different classes work through distinct mechanisms, so a head-to-head comparison illustrates trade-offs rather than equivalence. Both drugs are prescription-only, so a licensed provider must authorize use.
Adverse event totals above are pulled from the FDA's Adverse Event Reporting System (FAERS). For these top-ranked reactions alone, amiodarone has 4,231 submissions while clozapine has 51,145. Those figures reflect cumulative reporting volume, not per-patient risk, so older, widely dispensed drugs typically look worse on count alone. These two drugs have a known minor interaction flagged in FDA labeling, attributed to both of these drugs interfere with the electrical signals that control your heartbeat. combining them significantly increases the risk of heart rhythm complications.. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot represent individual circumstances. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This registry does not provide medical, treatment, substitution, or medication-change directions for amiodarone or clozapine.
Registry boundary: This comparison displays source-record fields and does not provide individualized medical direction.