Note: This article is for general education only and should not replace medical advice. Truxima can cause serious side effects, so patients should always follow the treatment plan and safety instructions provided by their oncology, rheumatology, dermatology, or infusion-care team.
What Is Truxima?
Truxima is the brand name for rituximab-abbs, a prescription biologic medicine given by intravenous infusion. It is a biosimilar to Rituxan, which means it is highly similar to the reference rituximab product and is expected to work in the same way, with no clinically meaningful differences in safety or effectiveness.
Truxima belongs to a group of medicines called CD20-directed monoclonal antibodies. In plain English, it targets CD20, a protein found on certain B cells. B cells are part of the immune system, but in some conditions they either become cancerous or contribute to inflammation. Truxima helps reduce these problematic B cells, which is why it may be used for certain types of non-Hodgkin lymphoma, chronic lymphocytic leukemia, rheumatoid arthritis, granulomatosis with polyangiitis, microscopic polyangiitis, and pemphigus vulgaris.
Because Truxima affects immune cells, side effects can range from mild and temporary to serious and urgent. The good news is that many side effects can be anticipated, monitored, and managed with the right plan. The not-so-good news? This is not the kind of medicine where you should “wait and see” if something feels wrong. Your care team wants to know early, even if you feel like you are being dramatic. In medicine, dramatic is sometimes useful.
Common Truxima Side Effects
The most common side effects of Truxima vary depending on the condition being treated and whether it is used alone or with chemotherapy, methotrexate, corticosteroids, or other medicines. Still, several side effects appear often enough that patients should know what to expect.
Infusion-Related Reactions
Infusion-related reactions are among the most common Truxima side effects. They can happen during the infusion or within 24 hours afterward, especially with the first dose. Symptoms may include fever, chills, shaking, itching, rash, headache, nausea, weakness, dizziness, shortness of breath, throat tightness, flushing, chest discomfort, or changes in blood pressure.
To lower the risk, healthcare providers usually give premedications before each infusion, such as acetaminophen and an antihistamine. Some patients, especially those being treated for rheumatoid arthritis, GPA, MPA, or pemphigus vulgaris, may also receive a corticosteroid before the infusion. Nurses monitor patients closely, and the infusion can be slowed, paused, or stopped if a reaction occurs.
How to manage it: Wear comfortable clothes to the infusion center, bring water if allowed, and tell the nurse immediately if you feel unusual warmth, itching, chest tightness, dizziness, or breathing changes. Do not try to “tough it out.” Infusion nurses have seen it all, including people who insist they are fine while turning the color of a tomato. Speak up early.
Fatigue and Weakness
Tiredness is common after Truxima treatment. Some people feel worn out the same day; others feel a dip for several days. Fatigue may come from the medicine itself, the condition being treated, anemia, infection, poor sleep, or other medications used with Truxima.
How to manage it: Plan lighter activities after infusion days. Prioritize sleep, gentle movement, hydration, and balanced meals. If fatigue becomes severe, sudden, or comes with fever, shortness of breath, dizziness, or unusual bruising, contact your healthcare provider.
Nausea, Diarrhea, and Digestive Upset
Some patients experience nausea, diarrhea, stomach discomfort, or appetite changes. Digestive side effects may be more noticeable when Truxima is used with chemotherapy or other immune-suppressing medicines.
How to manage it: Eat smaller meals, choose bland foods when your stomach is cranky, and ask your provider about anti-nausea medicine if needed. Call your doctor promptly for severe abdominal pain, repeated vomiting, bloody stool, signs of dehydration, or diarrhea that does not improve.
Headache, Body Aches, and Joint Pain
Headache, muscle aches, body aches, back pain, and joint pain may occur during or after treatment. In some cases, these symptoms are part of an infusion reaction. In others, they may feel more like a flu-ish hangover without the party.
How to manage it: Ask your healthcare provider which pain relievers are safe for you. Do not automatically reach for ibuprofen, naproxen, or aspirin unless your provider approves, especially if you have kidney problems, low platelets, bleeding risk, stomach ulcers, or are receiving chemotherapy.
Upper Respiratory Infections
Because Truxima affects B cells, it can increase the risk of infections. Common infections may include runny nose, sore throat, sinus symptoms, cough, bronchitis, urinary tract infections, or fever. For patients with rheumatoid arthritis, common side effects have included upper respiratory tract infection, nasopharyngitis, urinary tract infection, and bronchitis.
How to manage it: Wash hands often, avoid close contact with people who are sick, stay current with recommended non-live vaccines before treatment when possible, and report infection symptoms early. Fever, chills, painful urination, worsening cough, shortness of breath, or wounds that will not heal should not be ignored.
Serious Truxima Side Effects That Need Urgent Attention
Truxima has boxed warnings, which are the strongest safety warnings required by the U.S. Food and Drug Administration. These warnings do not mean every patient will have a serious reaction. They do mean patients and caregivers should know what symptoms require fast medical attention.
Severe Infusion Reactions
Serious infusion reactions can include trouble breathing, swelling of the lips or throat, chest pain, severe dizziness, fainting, abnormal heartbeat, low blood pressure, or severe rash. These reactions can be life-threatening, especially during the first infusion or within 24 hours afterward.
What to do: During the infusion, alert the nurse immediately. After leaving the infusion center, seek urgent medical help for breathing problems, chest pain, fainting, severe weakness, swelling of the face or throat, or blue or pale skin.
Severe Skin and Mouth Reactions
Truxima may rarely cause severe mucocutaneous reactions, which can involve the skin, lips, mouth, eyes, or other mucous membranes. Warning signs include painful sores, blisters, peeling skin, rash with fever, ulcers in the mouth, or skin that feels tender and starts to shed.
What to do: Call your healthcare provider right away if you notice blisters, peeling, painful mouth sores, or a spreading rash. This is not a “maybe it is just dry skin” situation. Severe skin reactions require medical evaluation.
Hepatitis B Reactivation
Truxima can reactivate hepatitis B virus in people who currently have hepatitis B or had it in the past, even if they feel perfectly healthy. Reactivation may lead to serious liver damage, liver failure, or death. Providers typically screen for hepatitis B before starting treatment.
Symptoms to report: unusual tiredness, yellowing of the skin or eyes, dark urine, pale stools, nausea, vomiting, stomach pain, loss of appetite, or muscle aches. Patients with past hepatitis B may need antiviral medicine and monitoring during and after treatment.
Progressive Multifocal Leukoencephalopathy
Progressive multifocal leukoencephalopathy, often shortened to PML, is a rare but very serious brain infection that has occurred in some people receiving rituximab products. It can cause severe disability or death.
Symptoms to report immediately: new confusion, memory problems, vision changes, trouble speaking, trouble walking, loss of balance, weakness on one side of the body, or sudden changes in coordination. These symptoms deserve urgent medical care, not a search-engine spiral at 2 a.m.
Tumor Lysis Syndrome
Tumor lysis syndrome can happen when cancer cells break down quickly and release their contents into the bloodstream. This may affect the kidneys, heart rhythm, and blood chemistry. It is more likely in patients with certain blood cancers and high tumor burden.
How it is managed: Providers may use intravenous fluids, medicines to lower uric acid, and blood tests to monitor kidney function and electrolytes. Patients should report nausea, vomiting, diarrhea, muscle cramps, weakness, confusion, dark urine, reduced urination, or irregular heartbeat.
Heart and Kidney Problems
Some patients may experience chest pain, irregular heartbeat, heart attack, kidney injury, or worsening kidney function. The risk may be higher in people with existing heart or kidney disease, certain cancer treatments, tumor lysis syndrome, or other medical complications.
What to do: Tell your provider before treatment if you have a history of heart rhythm problems, chest pain, heart failure, kidney disease, or reduced urine output. Seek urgent help for chest pressure, fainting, severe shortness of breath, swelling, very little urination, or fast irregular heartbeat.
Bowel Obstruction or Perforation
Rarely, bowel obstruction or gastrointestinal perforation has been reported, especially in patients receiving rituximab products with chemotherapy. Symptoms may include severe abdominal pain, repeated vomiting, bloating, inability to pass stool or gas, fever, or worsening tenderness.
What to do: Severe or persistent abdominal pain after treatment should be reported immediately. Do not try to manage intense abdominal symptoms with antacids and optimism.
Side Effects by Condition Treated
Truxima is used across different diseases, so side effect patterns can look different from patient to patient. Someone receiving Truxima with chemotherapy for lymphoma may have a different experience than someone receiving it with methotrexate for rheumatoid arthritis.
Non-Hodgkin Lymphoma
In non-Hodgkin lymphoma, common adverse reactions may include infusion reactions, fever, chills, infection, low lymphocyte counts, and weakness. When chemotherapy is part of the regimen, side effects can also reflect the chemotherapy drugs, not just Truxima.
Chronic Lymphocytic Leukemia
For chronic lymphocytic leukemia, common side effects may include infusion reactions and neutropenia, which means a low level of neutrophils, a type of white blood cell important for fighting infection. Patients may need regular blood tests and infection-prevention guidance.
Rheumatoid Arthritis
In rheumatoid arthritis, Truxima is used with methotrexate in adults who have had an inadequate response to certain other therapies. Common side effects may include upper respiratory infections, urinary tract infections, bronchitis, and nasopharyngitis. Infusion reactions and cardiovascular events are also important safety considerations.
GPA, MPA, and Pemphigus Vulgaris
In granulomatosis with polyangiitis and microscopic polyangiitis, common side effects may include infections, nausea, diarrhea, headache, muscle spasms, anemia, swelling, and infusion-related reactions. In pemphigus vulgaris, reported side effects may include infusion reactions, headache, upper respiratory infection or nasopharyngitis, depression, and infections.
How to Prepare Before a Truxima Infusion
Preparation can make Truxima treatment less stressful and safer. Before your first infusion, your care team may review your medical history, medications, allergies, vaccination status, infection history, hepatitis B test results, pregnancy status, and baseline blood counts.
Make a Medication List
Bring a current list of prescription medicines, over-the-counter drugs, vitamins, supplements, and herbal products. This matters because some medicines can affect infection risk, bleeding risk, kidney function, immune response, or vaccine planning.
Ask About Vaccines
Patients should ask their provider whether any vaccines are recommended before starting Truxima. Live vaccines are generally not recommended before or during treatment unless a healthcare provider specifically advises otherwise. Because Truxima affects B cells, vaccine timing matters.
Plan for a Long First Infusion
The first Truxima infusion can take several hours. Bring snacks if allowed, a phone charger, headphones, a sweater, and something relaxing to do. The infusion chair is not exactly a spa, but with the right supplies, it can at least become a slightly more comfortable waiting room with medical supervision.
Practical Ways to Manage Mild Side Effects at Home
Mild side effects should still be taken seriously, but many can be managed with supportive care after your provider confirms they are not signs of something more serious.
For Fatigue
Use the “energy budget” method. If infusion day costs ten energy dollars, do not schedule grocery shopping, a work presentation, and a family dinner on the same day. Rest before you crash. Gentle walking may help, but intense workouts can wait until your care team says they are appropriate.
For Nausea
Try small, simple meals such as toast, rice, bananas, soup, crackers, applesauce, or oatmeal. Sip fluids slowly. If nausea interferes with eating, drinking, or taking medications, ask your provider about anti-nausea treatment.
For Infection Prevention
Good hygiene matters. Wash hands, clean high-touch surfaces, avoid sharing drinks, and consider wearing a mask in crowded indoor spaces if your care team recommends it. Call your provider for fever or signs of infection. When immune cells are being intentionally lowered, “just a cold” deserves a little more respect.
For Emotional Stress
Truxima treatment can feel intimidating, especially when reading about serious warnings. Anxiety before infusions is normal. Ask the infusion team what to expect step by step. Many patients feel better once they understand the process, know what symptoms to report, and have a plan for the day.
When to Call Your Doctor Immediately
Contact your healthcare provider right away or seek urgent medical care if you experience trouble breathing, chest pain, fainting, severe dizziness, swelling of the face or throat, severe rash, blisters, peeling skin, painful mouth sores, yellow skin or eyes, dark urine, fever, chills, severe abdominal pain, repeated vomiting, confusion, vision changes, trouble walking, weakness on one side, reduced urination, or symptoms of a serious infection.
Also call your provider if side effects are persistent, worsening, or simply feel unusual for you. Patients sometimes hesitate because they do not want to bother the clinic. Please bother them. That is part of the job, and it is much better to ask early than to arrive late with a problem that has been quietly leveling up like a video game villain.
Experiences and Real-Life Tips for Living With Truxima Treatment
While every patient’s experience with Truxima is different, many people describe the first infusion as the most emotionally loaded part of treatment. The medical chair, IV line, premedications, monitoring, and long appointment can make the day feel bigger than expected. One helpful mindset is to treat infusion day as a planned medical event rather than a normal errand. Clear your schedule if possible, arrange transportation if you feel unsure about driving afterward, and give yourself permission to do less.
Patients often say that the waiting is harder than the infusion itself. The medicine is given slowly, especially at first, because the care team is watching for infusion reactions. That slow pace is not a sign that something is wrong; it is part of the safety plan. If the infusion is paused because of itching, chills, flushing, or throat discomfort, it may be restarted more slowly after symptoms are treated. Many people continue treatment successfully after a mild or moderate reaction, but the decision always belongs to the healthcare team.
Another common experience is delayed tiredness. Some patients feel fine leaving the infusion center, then feel drained later that evening or the next day. This is why it helps to prepare food ahead of time, keep water nearby, and avoid scheduling demanding tasks for the following day. A simple “recovery corner” at home can help: comfortable clothes, easy meals, thermometer, medication list, clinic phone number, and a notebook for symptoms.
A symptom notebook may sound old-fashioned, but it is surprisingly useful. Write down the date of infusion, premedications, symptoms, temperature, appetite changes, bowel changes, rashes, sleep quality, and questions for the next appointment. This gives your provider better information than “I felt weird sometime last week,” which is honest but not very medically specific.
People receiving Truxima for autoimmune conditions may also struggle with the invisible nature of treatment. Friends may assume that if there is no hair loss or hospital stay, the treatment is easy. That is not always true. Immune-modifying therapy can bring fatigue, infection worries, schedule disruptions, and emotional stress. It is reasonable to explain your boundaries clearly: “I am avoiding sick contacts,” “I need rest after infusion,” or “I can join, but I may leave early.” No courtroom-level defense required.
For patients receiving Truxima as part of cancer treatment, side effects may overlap with chemotherapy, steroids, anti-nausea medicines, and the cancer itself. In that case, it is especially important not to assume every symptom is “just Truxima.” Fever, dehydration, severe weakness, mouth sores, or unusual bleeding may require quick evaluation.
The most useful experience-based advice is simple: build a communication routine with your care team. Ask what temperature counts as a fever, which symptoms require the emergency room, which symptoms can wait until office hours, and whether you need blood tests before each cycle. Truxima can be an important therapy, but it works best when patients are informed, prepared, and willing to report problems early.
Conclusion
Truxima can be an effective treatment for several serious conditions, but it also requires thoughtful monitoring. Common side effects include infusion reactions, infections, fatigue, nausea, body aches, headache, and digestive symptoms. Serious risks include severe infusion reactions, hepatitis B reactivation, PML, severe skin and mouth reactions, tumor lysis syndrome, kidney problems, heart problems, and bowel complications.
The best way to manage Truxima side effects is not to memorize every possible medical term. It is to prepare before treatment, attend all lab appointments, report symptoms early, follow infection-prevention guidance, and keep an open line with your healthcare team. Truxima is powerful medicine, and powerful medicine deserves a smart plan.
