If you or a loved one has bipolar disorder, you may be exploring treatment options to help manage symptoms. Bipolar disorder is a mental health condition that causes changes in mood, energy, and activity levels.
People living with bipolar I disorder may experience sudden (acute) episodes called manic episodes, which can include racing thoughts, extreme energy, reduced need for sleep, irritability, and impulsive behavior. In people with bipolar I disorder, manic episodes last at least a week or become severe enough to require treatment.
People with bipolar disorder can also have depressive episodes, which often involve low mood, loss of interest in activities, fatigue, and trouble concentrating. Some people experience mixed episodes, during which symptoms of mania and depression happen at the same time or go back and forth.
Treatment for bipolar disorder usually includes medicines that help stabilize mood or improve symptoms of mania or depression. These may include mood stabilizers, antipsychotic medicines, or a combination of treatments. Antipsychotic medicines are commonly used because they can help control manic symptoms more quickly than some other treatments.
Bysanti (milsaperidone) was approved by the FDA in 2026 for the treatment of manic or mixed episodes associated with bipolar I disorder in adults. Bysanti may also be used to treat other mental health conditions. It belongs to a group of medicines called second-generation antipsychotics, also known as atypical antipsychotics.
This article covers how Bysanti works for bipolar disorder, the typical dosage, and how it was studied for this use. You may also be interested in learning more about Bysanti side effects and Bysanti interactions.
How Does Bysanti Work for Bipolar Disorder?
The exact way Bysanti works is not fully understood. However, researchers believe its effects are related to how it blocks certain receptors in the brain.
Receptors are structures on brain cells that respond to chemical signals. Bysanti affects receptors that respond to important brain chemicals called dopamine and serotonin. It also affects norepinephrine and histamine receptors. These chemicals help regulate your mood, thoughts, and behavior. Changes in dopamine and serotonin activity are believed to contribute to symptoms of bipolar disorder.
By adjusting how these brain signals work, Bysanti may help ease symptoms of manic or mixed episodes in people with bipolar disorder.
How Do I Take Bysanti for Manic or Mixed Episodes of Bipolar Disorder?
Bysanti is typically taken by mouth twice a day, with or without food. To lower the risk of certain side effects such as dizziness, the dose is usually increased gradually over several days.
For adults with bipolar I disorder having manic or mixed episodes, the typical titration schedule for starting Bysanti treatment is:
- Day 1: 1 mg twice daily
- Day 2: 3 mg twice daily
- Day 3: 6 mg twice daily
- Day 4: 9 mg twice daily
- Day 5 and on: 12 mg twice daily
The recommended maintenance dosage for bipolar disorder is 12 mg twice daily.
Some people process medicines differently because of inherited differences in certain enzymes. One of these enzymes is called CYP2D6, which helps break down many medicines in the body. Some people are “CYP2D6 poor metabolizers,” which means they break down certain medicines more slowly and may need a lower dose of Bysanti.
Your doctor may recommend special testing before starting treatment to see whether a lower dose may be safer for you. Dose adjustments may also be needed if you take certain other medicines that affect how Bysanti is broken down in the body.
Tell your health care provider about all of the medicines and supplements you take, any health conditions you have, or any treatment you have received in the past. In many cases, it can be helpful to bring a trusted family member or caregiver along to your appointments to discuss past treatments and conditions with your health care provider.
What Is the Difference Between Bysanti and Fanapt?
Bysanti (milsaperidone) and Fanapt (iloperidone) are closely related medicines. Fanapt was first approved in the United States in 2009, while Bysanti was approved in 2026.
After you take Bysanti, the medicine changes back and forth between milsaperidone and iloperidone. This happens because of simple chemical steps your body uses to process the medicine. Because the medicine switches between these two forms, both Bysanti and Fanapt work in very similar ways and have similar side effects.
How Was Bysanti Studied for Bipolar Disorder?
The FDA’s approval of Bysanti for manic or mixed episodes of bipolar disorder is based on studies showing the effectiveness of iloperidone (Fanapt). Because iloperidone and milsaperidone rapidly convert into each other in the body, studies of iloperidone help show how Bysanti treats this condition.
A clinical study was done to test the safety and effectiveness of iloperidone in adults with bipolar disorder. In this study, participants were randomly assigned to receive either the study medicine or a placebo (a pill with no active medicine) twice daily for four weeks. Neither the participants nor the researchers knew which treatment each person took.
The study enrolled adults aged 18-65 years who had bipolar I disorder (manic or mixed type) and were experiencing a manic episode. Participants also had to meet the following criteria:
- At least one past manic episode that required treatment
- A score of 20 or higher on the Young Mania Rating Scale (YMRS), a scale that measures symptom severity from 0 to 60, with higher scores showing more severe manic symptoms
- A score of 4 or higher on the Clinical Global Impressions-Severity (CGI-S), a scale that measures the severity of mental illness on a scale of 1 to 7, with higher scores showing more severe illness
People could not join the study if they had certain other psychiatric conditions, recent substance dependence, certain heart problems, or a high risk of harming themselves or others.
A total of 414 adults joined the study. Of these, 392 participants received at least one dose and had at least one follow-up assessment after study treatment began. At the start of the study:
- The average age was about 43 years.
- More than half were men (about 56%), and the rest were women.
- Most were White (64%), 29% were Black or African American, and 7% identified as Other races (including American Indian or Alaska Native, Asian, and Native Hawaiian or Other Pacific Islander; numbers of each were not reported).
- Most participants (81%) had bipolar I disorder with mania, and some (19%) had bipolar I disorder with mixed episodes (both manic and depressive symptoms during the same episode).
- The average YMRS score was 29, and the average CGI-S score was 4.6.
What Are the Main Benefits of Bysanti for Bipolar Disorder Based on Studies?
The main goal of the study was to measure the improvement in manic symptoms using the Young Mania Rating Scale (YMRS). This scale goes from 0 to 60 points, with higher scores showing more severe symptoms.
After four weeks of treatment, participants taking iloperidone showed greater improvement than those taking a placebo, on average:
- YMRS scores decreased by 14 points in the iloperidone group.
- YMRS scores decreased by 10 points in the placebo group.
These results suggest that treatment with iloperidone, and therefore Bysanti, can meaningfully lessen the severity of manic symptoms during manic or mixed episodes in adults with bipolar I disorder.
Keep in mind that your results may differ from study results.
Are There Additional Potential Benefits of Bysanti for Bipolar Disorder Based on Studies?
Researchers also looked at additional outcomes to better understand how the treatment affected participants’ symptoms and overall condition. These measures looked at changes in illness severity and overall improvement during treatment.
In general, people taking iloperidone showed more improvement than those taking a placebo. More participants taking iloperidone had meaningful reductions in manic symptoms and reached remission, meaning their symptoms improved to the point that they were mild or no longer causing major problems.
How Fast Does Bysanti Start to Work for Bipolar Disorder?
After you take a dose of Bysanti, the medicine reaches its highest levels in the blood within about two to six hours. But it usually takes longer than that to see any effects of the medicine on your symptoms.
In the iloperidone study, improvements in manic symptoms began to appear within the first one to four weeks of treatment. But the timeline to see a difference can vary from person to person.
Ask your health care provider if you have questions about what to expect during treatment.
What Kind of Health Care Provider Prescribes Bysanti?
Treatments for bipolar disorder, such as Bysanti, are usually prescribed by a psychiatrist or other mental health care provider who specializes in treating mood disorders. In some cases, a primary care provider may prescribe the medicine.
Is There Any Cost Assistance Available?
Cost assistance programs may be available to help lower the price of Bysanti prescriptions. The drugmaker may also offer financial support programs for eligible patients.
If you have questions about the cost of Bysanti, talk to your health care provider, pharmacist, or insurance company. They may help you find available savings programs or other assistance options.
