Antipsychotics And Weight Gain - WebMD

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Written by Alicia BarneyMedically Reviewed by Smitha Bhandari, MD on August 24, 2024
  • Why Do Antipsychotics Make You Gain Weight?
  • Does the Type Matter?
  • What You Can Do
3 min read

Antipsychotic drugs treat schizophrenia, bipolar disorder, and other mental health disorders. They can ease your symptoms and help you avoid a relapse (when your symptoms come back), but they can also cause weight gain.

People often quickly put on weight after they start antipsychotics and keep gaining over time. Children are more likely to gain weight. Being overweight raises your risk of diabetes, heart attack, stroke, high blood pressure, arthritis, sleep apnea, and some cancers.

Why Do Antipsychotics Make You Gain Weight?

Antipsychotic drugs can make you hungrier, so you might eat more. That’s because they change the way your brain and hormones work together to control your appetite. You might crave sweets or fatty foods. They can also raise the amount of sugar and fat in your blood.

Does the Type Matter?

Some antipsychotic drugs are more likely than others to cause weight gain. The risk is highest with clozapine (Clozaril, FazaClo) and olanzapine (Zyprexa).

Chlorpromazine has a high to medium risk, while paliperidone, quetiapine, and risperidone have a medium risk. Drugs that cause the most weight gain tend to raise your blood’s sugar and fat levels.

Antipsychotics with a lower risk of weight gain are:

  • Aripiprazole (Abilify)
  • Asenapine (Saphris)
  • Brexipiprazole (Rexulti)
  • Cariprazine (Vraylar)
  • Haloperidol (Haldol)
  • Lumateperone (Caplyta)
  • Lurasidone (Latuda)
  • Ziprasidone (Geodon)
  • Xanomeline-trospium (Cobenfy)

But everyone is different. You might gain a lot, a little, or no weight, or even lose weight when taking an antipsychotic. It all depends on what you eat, how much you exercise, and your genes.

If you put on a lot of weight in the first month on a new medication, you’ll probably gain more long-term. You’ll probably gain more if you’re taking an antipsychotic for the first time.

What You Can Do

Talk to your doctor about potential weight gain before you start an antipsychotic. If you’re already taking one, don’t stop or take less without talking to your doctor. This could cause a relapse.

Your doctor should check your weight and body mass index -- a measurement of your height and weight -- often, especially during the first few months after you start antipsychotic drugs. Your doctor might also check your cholesterol and blood sugar levels.

Exercise and try to eat healthy meals (limit high-fat, high-sugar foods). A nutritionist can help you pick the right foods. Counseling can help, too.

Your doctor might also prescribe a medication like metformin to help with weight loss. You can also ask your doctor if you can switch to a drug with a lower risk of weight gain.

Any weight you gain usually goes away when you stop taking antipsychotics. If stopping is right for you, your doctor will slowly lower your dose so you don’t relapse.

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