Briumvi treatment is a prescription option for relapsing forms of multiple sclerosis (MS). If your doctor has recommended it, you may be wondering how it works, what the infusion visits are like, and what side effects to expect. This guide explains the most important things to know before starting Briumvi treatment so you can feel more prepared for your first infusion and your ongoing care.
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What Is Briumvi?
Briumvi treatment is used for certain adults with relapsing MS. Its generic name is ublituximab, and it is given as an intravenous infusion in a medical setting. That means it is administered through a vein rather than taken as a pill or self-injection.
Briumvi belongs to a group of MS therapies that target immune cells involved in inflammation and nerve damage. For many people with relapsing MS, the goal of treatment is to reduce relapses, slow disability progression, and limit new disease activity seen on MRI scans. For official prescribing information, see the U.S. Food and Drug Administration prescribing information.
In practical terms, Briumvi treatment is designed to help calm part of the immune system that may be contributing to MS attacks. It does not cure MS, but it may help lower the risk of future disease activity over time.
How Briumvi Works
Briumvi treatment works by targeting CD20-positive B cells, a type of immune cell involved in the abnormal immune response seen in MS. By reducing these cells, the medication helps lower inflammation that can damage the central nervous system.
In simple terms, the therapy aims to reduce one of the immune processes believed to contribute to MS relapses. That is why Briumvi treatment is considered a disease-modifying therapy rather than a short-term symptom reliever.
Because B cells are part of the immune response, the treatment can also affect how the body responds to infections and some vaccines. That is one reason careful screening and follow-up matter throughout care.
Briumvi treatment and immune activity
By lowering CD20-positive B cells, Briumvi treatment may help reduce the number of inflammatory events that lead to relapses. This mechanism is not meant to suppress the immune system completely. Instead, it selectively targets a part of the immune response that plays a role in MS.
That selective action is one reason neurologists may consider Briumvi for adults with active relapsing disease. Even so, the treatment still requires monitoring because any therapy that changes immune function can alter infection risk and vaccine response.
Understanding how the medicine works can also help set realistic expectations. Many patients hope to feel a dramatic change right away, but MS disease-modifying therapies are usually judged by what they prevent over time rather than by immediate symptom relief.
Who Is Briumvi For?
Briumvi treatment is used for adults with relapsing forms of MS, which may include:
- Relapsing-remitting MS
- Active secondary progressive MS
- Clinically isolated syndrome in some cases, depending on clinical guidance and diagnosis
A neurologist typically decides whether Briumvi is a good option based on your MS history, MRI findings, relapse pattern, previous treatments, and overall health. In some patients, Briumvi may be chosen because of active disease despite prior therapy. In others, it may be selected because an infusion schedule every six months fits their lifestyle better than more frequent dosing.
For some people, treatment choice also depends on practical concerns such as transportation, work schedules, and the ability to attend infusion appointments reliably. Those everyday factors matter because consistency is a big part of long-term MS management.
What to Discuss Before Starting
Before beginning Briumvi treatment, your doctor will want a full picture of your health. Important topics to discuss include:
- Any history of infections
- Hepatitis B infection or exposure
- Recent vaccines or planned vaccinations
- Pregnancy or plans to become pregnant
- Breastfeeding
- A history of allergic reactions to infusions or medications
- Any lung, liver, or immune system problems
- All current medications and supplements
This information helps your healthcare team lower the risk of complications and decide whether Briumvi treatment is appropriate for you. It also helps guide premedication choices and infusion planning.
You should also tell your clinician about past MS therapies, including any treatments that were stopped because they did not control symptoms well enough or caused side effects. That history can help your doctor judge whether a B-cell therapy fits your disease pattern.
What Tests or Screenings Might Be Needed?
Before starting treatment, your doctor may order tests to check for risks and establish a baseline. Common tests may include:
- Hepatitis B screening
- Blood work to check immune function
- MRI scans to monitor MS activity
- Other infection screening, depending on your medical history
These tests are important because Briumvi treatment affects the immune system and may increase the risk of certain infections. Your clinician may also use baseline results later to compare how well the therapy is working.
Testing can feel repetitive, but it serves a clear purpose. Baseline results make it easier to recognize changes later, especially if you develop symptoms that could be related to infection, relapse, or another medical issue.
In some cases, your doctor may also want routine bloodwork during treatment to look for changes that are not obvious from symptoms alone. Regular follow-up helps catch problems early and keeps the plan safer over time.
How Briumvi Is Given
Briumvi treatment is given by infusion at a clinic, hospital, or infusion center. It is not a pill or self-injection.
The first dose is usually split into two infusions. After that, treatment is typically given every six months. Your healthcare provider will give you a specific schedule based on the approved prescribing instructions and your treatment plan.
Before each infusion, you may receive premedications to help reduce the chance of infusion-related reactions. These often include:
- An antihistamine
- A steroid
- Possibly other medications, depending on your provider’s protocol
The infusion itself may take some time, and you will usually be monitored afterward for side effects. Many patients find it helpful to bring water, a snack, reading material, and any items that make a long appointment easier.
It may also help to plan the rest of your day around the visit. Some people feel tired after the infusion or premedications, so arranging a lighter schedule can make the appointment less stressful.
What Are Infusion-Related Reactions?
Infusion-related reactions are one of the most important things to know about Briumvi treatment. These reactions can happen during or shortly after the infusion and may include:
- Fever
- Chills
- Headache
- Nausea
- Rash
- Itching
- Shortness of breath
- Low blood pressure
- Dizziness
Not everyone gets these reactions, and premedication can help reduce the risk. Your healthcare team will watch for symptoms and may slow or stop the infusion if needed. If you feel unusual symptoms during an infusion, tell the nurse or provider right away.
Most infusion centers are well prepared for these reactions, which is why observation during and after treatment matters. Even when symptoms are mild, reporting them early gives the team more options for managing the infusion safely.
What Are the Common Side Effects?
Like all medications, Briumvi treatment can cause side effects. Common ones may include:
- Infusion reactions
- Upper respiratory infections
- Fatigue
- Headache
- Fever
- Mouth sores
- Cough
Some side effects are mild and manageable, while others may require medical attention. Always report new or worsening symptoms to your doctor. It is also important to tell your care team if side effects start to affect your daily activities, sleep, or ability to keep up with the infusion schedule.
People sometimes dismiss symptoms like fatigue or cough because they seem ordinary, but they can still matter in the context of immune-based therapy. If a symptom lasts longer than expected or becomes more intense, it is worth a call to your provider.
What Are the Serious Risks?
Because Briumvi treatment changes the way the immune system works, there are some serious risks to know about.
Infections
Briumvi treatment may increase the risk of infections, including respiratory infections and other bacterial or viral infections. In rare cases, serious infections can occur.
Call your doctor if you develop symptoms such as:
- Fever
- Persistent cough
- Burning during urination
- Shortness of breath
- Unusual fatigue
- Signs of a worsening infection
Hepatitis B Reactivation
If you have ever had hepatitis B, Briumvi treatment may cause the virus to become active again. That is why screening before treatment is so important.
Reduced Immune Response
Briumvi treatment can lower parts of the immune response, which may affect how well your body fights infections and may reduce response to some vaccines.
Progressive Multifocal Leukoencephalopathy
Although rare, serious brain infections like progressive multifocal leukoencephalopathy (PML) are a concern with some immune therapies. Report new neurological symptoms immediately, such as:
- Vision changes
- Weakness
- Trouble speaking
- Confusion
- Changes in balance or coordination
For a broader overview of MS monitoring and why MRI follow-up matters, you may also find this guide helpful: Brain Scans Explained: What They Reveal and Why It Matters.
If you ever notice symptoms that feel different from your usual MS pattern, do not assume they are harmless. New neurological changes deserve prompt medical review, especially when you are taking a treatment that affects immune function.
Can You Get Vaccines While Taking Briumvi?
Vaccines are an important part of treatment planning, but timing matters. Because Briumvi treatment affects the immune system, some vaccines may not work as well, and live vaccines may not be recommended during treatment.
Before starting treatment, ask your doctor whether you need any vaccines in advance. This is especially important for:
- Flu vaccines
- COVID-19 vaccines
- Shingles vaccines
- Other routine immunizations
Your doctor can help determine the safest timing for vaccinations.
It is a good idea to review your vaccine record before the first infusion, not after treatment has already begun. Planning ahead can prevent delays and may help you avoid confusion about which vaccines are appropriate later.
What About Pregnancy and Breastfeeding?
If you are pregnant, planning to become pregnant, or breastfeeding, talk to your doctor before starting Briumvi treatment.
Because the medication changes immune function, pregnancy planning deserves careful discussion. Your doctor will weigh the possible benefits and risks and may discuss timing, contraception, and alternative treatment options if needed. If you become pregnant while taking Briumvi, notify your healthcare provider right away.
Questions about family planning, vaccine timing, and infection risk are common during MS care, so it is best to bring them up early rather than waiting until the day of your infusion.
Parents and people planning a family often want a clear timeline for treatment, monitoring, and future dosing. That timeline is best decided with your neurologist, since your MS activity and overall health can affect the safest plan.
How Soon Does Briumvi Start Working?
Briumvi treatment does not usually work instantly. Like many MS disease-modifying therapies, its benefits are measured over time. You may not notice immediate changes, but your doctor may monitor:
- Relapse frequency
- MRI activity
- New or worsening symptoms
- Overall disease progression
It can take months to evaluate how well the treatment is controlling MS activity. Even when you feel well, your clinician may continue to follow imaging and exam findings to look for silent disease activity.
That longer timeline can be frustrating, especially if you want quick proof that treatment is helping. Still, MS care often depends on a combination of symptoms, exams, and scans rather than one single feeling or test result.
What Results Can You Expect?
The goal of Briumvi treatment is to reduce future disease activity. For many people, success may look like:
- Fewer relapses
- Less new inflammation on MRI
- Slower progression of disability
- Better long-term disease control
Every person responds differently, so regular follow-up appointments are important. Your doctor may use exam findings, symptom reports, and imaging to determine whether Briumvi is working well for you. If you want to understand how immune-targeting MS drugs are classified, the National Multiple Sclerosis Society medication overview is a useful educational resource.
It is also normal to compare expected benefits with lifestyle needs. Some patients value the convenience of twice-yearly infusion visits, while others prefer therapies with different dosing patterns. The best plan is the one that matches your medical needs and treatment goals.
When reviewing results with your neurologist, ask what improvement would count as success in your specific case. For one person, that may mean fewer relapses. For another, it may mean stable MRI findings and no new disability.
What Should You Do Before Your First Infusion?
Before your first Briumvi treatment, it helps to be prepared. Consider the following:
- Confirm your infusion date and time
- Ask whether you need pre-infusion blood work
- Tell your doctor about any recent illness
- Share all medications, vitamins, and supplements you take
- Ask which symptoms should be reported before or after treatment
- Arrange transportation if your provider recommends it
- Wear comfortable clothing for the infusion visit
It is also helpful to know how long the infusion appointment may take, especially for the first treatment. Some clinics ask patients to arrive early for check-in and premedication, so planning ahead can reduce stress on the day of the visit.
You may also want to bring a list of questions to the appointment. That way, you are less likely to forget something important once the infusion day arrives.
What Should You Tell Your Doctor During Treatment?
While on Briumvi treatment, let your doctor know if you:
- Develop an infection
- Miss an infusion appointment
- Have new neurological symptoms
- Experience unusual side effects
- Plan to get vaccinated
- Become pregnant or think you may be pregnant
Ongoing communication helps your healthcare team adjust care when needed. Even if a symptom seems minor, it is worth mentioning if it is new, persistent, or getting worse.
Staying in touch also helps your doctor decide whether any changes in monitoring are needed between infusions. That may include blood tests, infection checks, or imaging depending on your situation.
When Should You Call a Doctor Right Away?
Seek medical help promptly if you have signs of a serious reaction or infection, such as:
- Trouble breathing
- Chest tightness
- Swelling of the face or throat
- High fever
- Severe rash
- Confusion
- Vision changes
- Weakness that is new or worsening
- Persistent or severe symptoms after an infusion
Do not ignore symptoms that feel unusual or severe. Early treatment can help reduce complications and keep your care plan on track.
If symptoms appear suddenly, contact your healthcare team or seek urgent care rather than waiting for the next appointment. Acting quickly is especially important for breathing problems, facial swelling, or sudden neurological changes.
Is Briumvi the Right MS Treatment for You?
Briumvi treatment may be a strong option for some adults with relapsing MS, but the right treatment depends on many factors. Your doctor will consider:
- How active your MS is
- Whether you have had relapses recently
- What other treatments you have tried
- Your infection risk
- Your vaccination history
- Your personal preferences and lifestyle
Some people prefer infusions given every six months because they do not want to manage daily or weekly medication. Others may have reasons to choose a different therapy. The best treatment is the one that fits your medical needs and health goals.
If you have symptoms that affect daily function, such as vision problems, it may be helpful to learn more about related neurological concerns in this article on Blind Spot in Eye: Causes, Symptoms, and Treatment.
It can also help to think beyond the medication itself. Follow-up visits, lab testing, and communication with your care team all play a role in whether the treatment stays safe and effective for you over the long term.
The Bottom Line
Briumvi treatment is an infusion therapy for relapsing forms of MS that works by targeting B cells involved in inflammation. Before starting treatment, it is important to understand how the medication is given, what side effects can happen, what tests you may need, and how to reduce the risk of complications.
The most important steps before treatment are to talk openly with your doctor, complete any recommended screenings, review your vaccination status, and know what symptoms to report. With the right preparation and monitoring, Briumvi treatment may be a useful option for helping manage multiple sclerosis over time.
As with any MS therapy, the goal is not just to treat relapses after they happen, but to reduce future disease activity and support long-term stability. If you and your neurologist decide this is the right path, staying organized and informed can make the process much easier.
For many people, the biggest advantage of Briumvi is the combination of targeted immune treatment and infrequent dosing. If that balance matches your needs, it may be worth discussing in detail with your care team before your next infusion.
