Compare chlorpromazine vs. Clozaril

Head-to-head comparisons of medication uses, side effects, ratings, and more.

Thorazine
(chlorpromazine)

Clozaril
(clozapine)

Stabilizes your mood. Thorazine (chlorpromazine) has more side effects than other medicines like it. It is most useful during psychotic episodes because it slows you down quickly.Helps control your thoughts and actions. Clozaril (Clozapine) treats schizophrenia when other drugs haven't worked, but you'll have to get blood work done regularly and might gain weight.
Reviews & ratings
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Have you used Thorazine (chlorpromazine)?
Worth itNot sureNot worth it

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Have you used Clozaril (clozapine)?
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Side effects
chlorpromazineClozaril

The chlorpromazine FDA package insert doesn’t have numbers about how common side effects are.

More about chlorpromazine side effects »
  • Drowsiness/sedation 39%
  • Salivation 31%
  • Abnormally fast heart beat 25%
  • Dizziness/vertigo 19%
  • Constipation 14%
  • Low blood pressure 9%
  • Headache 7%
  • Dry mouth 6%
  • Sweating 6%
  • Fainting 6%
More Clozaril side effects »
How it works
chlorpromazineClozaril
Thorazine (chlorpromazine) is a derivative of phenothiazine, which regulates dopamine levels in your brain to improve your mood.Clozaril (Clozapine) is an atypical antipsychotic. Researchers don't know exactly how it works. It seems to change dopamine and serotonin activity in your brain, which affects thoughts and mood.
Type of medication
chlorpromazineClozaril
Prescription onlyPrescription only
Available as
chlorpromazineClozaril
  • Pill
  • Injection
  • Pill
  • Dissolving tablet
  • Liquid
Used for
chlorpromazineClozaril
Risk factors for serious side effects
chlorpromazineClozaril
  • People over 65 with dementia and psychosis
  • Taking antipsychotic medications
  • Asthma
  • COPD
  • Acute respiratory infections
Detailed Thorazine (chlorpromazine) risks & warnings »
  • Dehydration
  • Taking blood pressure medications
  • Seizure disorder
  • Alcohol abuse
  • History of heart problems
Detailed Clozaril (clozapine) risks & warnings »
Pregnancy

The FDA hasn’t classified this medicine’s effects on unborn babies. Talk with your doctor about this medicine if you’re pregnant or planning on it.

Research studies with animals haven’t found a risk to unborn babies, but it hasn’t been properly studied in humans.

Alcohol
chlorpromazineClozaril
  • Don't combine with alcohol or narcotics because it can cause you to stop breathing.
  • You need to limit the amount of alcohol you drink while on Clozaril (Clozapine).
Sleep
chlorpromazineClozaril
  • Can make you very sleepy so don't drive or do anything that requires concentration until you know how it affects you.
  • Can cause dizziness or drowsiness. Avoid alcohol and be careful when changing positions or doing anything that requires your full attention until you know how it affects you.
Weight
chlorpromazineClozaril
No weight related info.
  • People on Clozaril (Clozapine) have reported weight gain. This is common. If this bothers you, talk to your doctor about what you can do to stop this from happening.
  • Can affect your weight, cholesterol, and blood sugar control.
Upsides and benefits
chlorpromazineClozaril
  • Acts fast to slow you down during a psychotic episode.
  • Can also be used for nausea or migraines.
  • Safe for use in children as young as 6 months.
  • Comes in a sugar-coated pill for easy administration.
  • Clinical studies show that Clozaril (Clozapine) is effective in treating schizophrenia when other medications have failed.
  • Has the lowest risk of causing movement problems when compared to other antipsychotic medicines.
  • Clozaril (Clozapine) is available as a normal tablet and as a mint-flavored tablet that dissolves on the tongue without water.
  • Available as a generic, which is cheaper.
Downsides and risks
chlorpromazineClozaril
  • Has more side effects than other medicines like it.
  • Can affect how your other medicines work.
  • Makes you more sensitive to the sun.
  • Can make you dizzy or lightheaded, especially when injected.
  • Cannot be stopped right away.
  • You need to get blood work done every time you can get a prescription filled for Clozaril (Clozapine).
  • You can only get Clozaril (Clozapine) at certain pharmacies that are registered to provide it.
  • If you don't get Clozaril (Clozapine) within 7 days of it being ready at the pharmacy, then you have to get blood work done again and get a new prescription from your doctor.
  • You need to limit the amount of alcohol you drink while on Clozaril (Clozapine).
Tips from our pharmacists for people taking the medication
chlorpromazineClozaril
  • Can make you very sleepy so don't drive or do anything that requires concentration until you know how it affects you.
  • Can cause involuntary muscle movements just like other medicines for your mood.
  • Can dry you out and make you more sensitive to the sun.
  • Don't combine with alcohol or narcotics because it can cause you to stop breathing.
  • Cannot be stopped suddenly.
  • Take Clozaril (Clozapine) exactly as prescribed and don't stop taking it without talking to your doctor.
  • Can cause dizziness or drowsiness. Avoid alcohol and be careful when changing positions or doing anything that requires your full attention until you know how it affects you.
  • Blood tests are needed before you start this medicine and before every refill. You need to pick up the medicine within 7 days of your blood tests.
  • Can affect your weight, cholesterol, and blood sugar control.
Learn more
More about chlorpromazineSide effectsAlternativesFDA package insert
Have you used Thorazine (chlorpromazine)?
Worth itNot sureNot worth it
More about ClozarilSide effectsReviews & ratingsAlternativesFDA package insert
Have you used Clozaril (clozapine)?
Worth itNot sureNot worth it