chlorpromazine vs thioridazine
Side-by-side comparison of chlorpromazine and thioridazine Data from FDA drug databases (Orange Book, NDC Directory, recalls, shortages) covering 20,000+ approved drugs, plus CMS pricing; see our methodology.
Thorazine
Mellaril
Chlorpromazine is a medicine that belongs to a class of drugs called phenothiazine antipsychotics. It can help manage symptoms of certain mental disorders by affecting chemical messengers in the brain.
Thioridazine is a medicine used to treat schizophrenia. It is only used when other antipsychotic medicines have not worked well enough.
Chlorpromazine can treat psychotic disorders like schizophrenia. It can also control nausea and vomiting. Additionally, it can help with restlessness before surgery, acute intermittent porphyria, tetanus, manic episodes of bipolar disorder, and intractable hiccups. In children, it can treat severe behavioral problems and hyperactivity.
Thioridazine is used to manage schizophrenia in adults and children. You should only use this medicine if other antipsychotic medicines have not worked for you. This is because thioridazine can cause serious heart problems.
Chlorpromazine works by changing the effect of certain natural chemicals in the brain. It blocks dopamine receptors, which helps to reduce psychotic symptoms. It also affects other neurotransmitters, such as histamine and acetylcholine.
Thioridazine affects the balance of certain chemicals in the brain. These chemicals, like dopamine, can affect mood and behavior. By changing the balance, thioridazine helps to reduce symptoms of schizophrenia.
- • Drowsiness
- • Drowsiness
- • Dry mouth
- • Blurred vision
- • Constipation
- • Nausea
- The medicine is not working 527
- Using the medicine for a purpose it is not approved for 432
- Harmful effects from different substances 426
- Taking too much medicine 345
- Medicines affecting each other 322
- Weight gain 8
- Medicine not working 7
- Shortness of breath 7
- Muscle spasms and contractions 6
- High blood sugar 6
Antipsychotic medicines like chlorpromazine can increase the risk of death in elderly patients who have dementia-related psychosis. Chlorpromazine is not approved for treating this condition.
Thioridazine can cause a life-threatening heart rhythm problem called Torsades de pointes, which can lead to sudden death. Because of this risk, only use thioridazine if other antipsychotic medicines have not worked. Elderly patients with dementia-related psychosis who are treated with antipsychotic drugs have an increased risk of death.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if chlorpromazine will harm your unborn baby. Talk to your doctor about the risks and benefits of taking this medicine during pregnancy and breastfeeding.
Tell your doctor if you are pregnant or plan to become pregnant. It is not known if thioridazine will harm your unborn baby. Talk to your doctor about the risks and benefits of taking thioridazine during pregnancy and breastfeeding.
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How to Read This chlorpromazine vs thioridazine Comparison
chlorpromazine is classified in the Typical Antipsychotic (Phenothiazine) drug class, while thioridazine sits within the Typical Antipsychotic (Phenothiazine) class. Because both drugs share the same classification, they are often considered interchangeable in theory — but clinical outcomes rarely track that cleanly. 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, chlorpromazine has 2,052 submissions while thioridazine has 34. Those figures reflect cumulative reporting volume — not per-patient risk — so older, widely dispensed drugs typically look worse on count alone. No direct interaction between these two drugs is listed in our FDA-derived dataset, though co-prescription still warrants pharmacist review. Serious warnings, pregnancy guidance, and contraindications can differ even when indications overlap.
A table cannot substitute for clinical judgment. Effectiveness, tolerability, drug-drug interactions with your other medications, kidney and liver function, pregnancy status, insurance formulary, and price all feed into a decision that only a licensed prescriber can make responsibly. Data here is sourced from FDA Structured Product Labels (SPL) and FAERS, both of which update as manufacturers and clinicians submit new information. This page is for educational purposes only, is not medical advice, and should not be used to self-switch between chlorpromazine and thioridazine — always consult your physician or pharmacist first.
Important: This comparison is for informational purposes only. Drug effects vary between individuals. Always consult your doctor or pharmacist for personalized medical advice.