Zanubrutinib – Uses, Dosage, Side Effects, Interaction

Last updated: February 8, 2026Reviewed date: February 8, 2026Reading time: 40 min read
Zanubrutinib - Uses, Dosage, Side Effects, Interaction
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Article Summary

Zanubrutinib is an inhibitor of Bruton's tyrosine kinase (BTK) with potential antineoplastic activity. Upon administration, zanubrutinib inhibits the activity of BTK and prevents the activation of the B-cell antigen receptor (BCR) signaling pathway. This prevents both B-cell activation and BTK-mediated activation of downstream survival pathways, which leads to the inhibition of the growth of malignant B-cells that overexpress BTK. BTK, a member of the Src-related BTK/Tec family...

Key Takeaways

  • This article explains Mechanism of Action in simple medical language.
  • This article explains Indications in simple medical language.
  • This article explains Contraindications in simple medical language.
  • This article explains Dosage in simple medical language.
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Definition

Zanubrutinib is an inhibitor of Bruton’s tyrosine kinase (BTK) with potential antineoplastic activity. Upon administration, zanubrutinib inhibits the activity of BTK and prevents the activation of the B-cell antigen receptor (BCR) signaling pathway. This prevents both B-cell activation and BTK-mediated activation of downstream survival pathways, which leads to the inhibition of the growth of B-cells that overexpress BTK. BTK, a member of the Src-related BTK/Tec family of cytoplasmic tyrosine kinases, is overexpressed in B-cell malignancies; it plays an important role in B- development, activation, signaling, proliferation, and survival.

Zanubrutinib is an oral inhibitor of Bruton’s tyrosine kinase that is used in the therapy of mantle cell . Zanubrutinib has been associated with a low rate of serum enzyme elevations during therapy but has not been linked to cases of clinically apparent injury although it may pose a risk for reactivation of B in susceptible patients.

Zanubrutinib is a novel Bruton’s tyrosine kinase (BTK) inhibitor used for the treatment of adult patients with mantle cell lymphoma (MCL) who have received at least one prior therapy. Mantle cell lymphoma is an aggressive mature B-cell non-Hodgkin lymphoma that is associated with early , poor outcomes, and long-term survival. BTK is an enzyme that plays a role in oncogenic signaling pathways, where it promotes the survival and proliferation of malignant B cells. Compared to the first-generation BTK inhibitor [ibrutinib], zanubrutinib displays higher potency and selectivity for BTK with fewer off-target effects. Due to this enhanced selectivity towards BTK, zanubrutinib belongs to the second-generation BTK inhibitor drug group that also includes [acalabrutinib], which was approved by the FDA in 2017. Zanubrutinib was granted accelerated approval by the FDA in November 2019 based on clinical trial results that demonstrated an 84% overall response rate from zanubrutinib therapy in patients with MCL, which measures the proportion of patients in a trial whose is entirely or partially destroyed by a drug. It is currently marketed under the trade name BRUKINSA™ and is available as oral capsules. In August 2021, the FDA granted accelerated approval to zanubrutinib for the treatment of adults with Waldenström’s macroglobulinemia. This is valid in the US, Europe, and Canada. In September 2021, zanubrutinib was granted another accelerated approval for the treatment of relapsed or refractory marginal zone lymphoma who have received at least one anti-CD20-based regimen. Zanubrutinib is an immunomodulating agent that decreases the survival of malignant B cells. It inhibits BTK by binding to its active site. It works to inhibit the proliferation and survival of malignant B cells to reduce the tumor size in mantle cell lymphoma.

Mechanism of Action

Bruton’s tyrosine kinase (BTK) is a non-receptor kinase and a signaling molecule for the B cell receptors expressed on the peripheral B cell surface. The BCR signaling pathway plays a crucial role in normal B-cell development but also in the proliferation and survival of malignant B cells in many B-cell malignancies, including mantle-cell lymphoma (MCL). Once activated by upstream Src-family kinases, BTK phosphorylates phospholipase-Cγ (PLCγ), leading to Ca2+ mobilization and activation of NF-κB and MAP kinase pathways. These downstream cascades promote the expression of genes involved in B cell proliferation and survival. The BCR signaling pathway also induces the anti-apoptotic protein Bcl-xL and regulates the integrin α4β1 (VLA-4)-mediated adhesion of B cells to vascular cell adhesion molecule-1 (VCAM-1) and fibronectin via BTK. Apart from the direct downstream signal transduction pathway of B cells, BTK is also involved in chemokine receptor, Toll-like receptor (TLR), and Fc receptor signaling pathways. Zanubrutinib inhibits BTK by forming a covalent bond with cysteine 481 residue in the adenosine triphosphate (ATP)–a binding pocket of BTK, which is the enzyme’s active site. This binding specificity is commonly seen with other BTK inhibitors. Due to this binding profile, zanubrutinib may also bind with varying affinities to related and unrelated ATP-binding kinases that possess a cysteine residue at this position. By blocking the BCR signaling pathway, zanubrutinib inhibits the proliferation, trafficking, chemotaxis, and adhesion of malignant B cells, ultimately leading to reduced tumor size. Zanubrutinib was also shown to downregulate programmed death-ligand 1 (PD-1) expression and cytotoxic T lymphocyte-associated antigen-4 (CTLA-4) on CD4+ T cells.

Indications

  • Zanubrutinib is indicated for the treatment of adult patients with mantle cell lymphoma (MCL) who have received at least one prior therapy. It is used to treat Waldenström’s macroglobulinemia in adults. Zanubrutinib is also indicated for the treatment of relapsed or refractory marginal zone lymphoma (MZL) in adults who have received at least one anti-CD20-based regimen.
  • Burkina as monotherapy is indicated for the treatment of adult patients with Waldenström’s macroglobulinemia (WM) who have received at least one prior therapy, or in first-line treatment for patients unsuitable for chemo-.
  • Zanubrutinib is an oral inhibitor of Bruton’s tyrosine kinase that is used in the therapy of refractory mantle cell lymphoma. Zanubrutinib has been associated with a low rate of serum enzyme elevations during therapy but has not been linked to cases of clinically apparent acute liver injury although it may pose a risk for reactivation of hepatitis B in susceptible patients.
  • Zanubrutinib is indicated for the treatment of adults with mantle cell lymphoma (MCL) who have received at least one prior therapy and for the treatment of Waldenström’s macroglobulinemia.[rx]
  • Mantle Cell Lymphoma (MCL)
  • Refractory Marginal Zone Lymphoma
  • Relapsed Marginal Zone Lymphoma
  • Waldenström’s Macroglobulinemia (WM)

Use in Cancer

Zanubrutinib is approved to treat adults with:

  • Mantle cell lymphoma who have received at least one other type of treatment.¹
  • Marginal zone lymphoma who have received at least one anti-CD20-based therapy but it did not work or is no longer working.¹
  • Waldenström macroglobulinemia.

This use is approved under FDA’s Accelerated Approval Program. As a condition of approval, a confirmatory trial(s) must show that zanubrutinib provides a clinical benefit in these patients. Zanubrutinib is also being studied in the treatment of other types of cancer.

Contraindications

  • a bad
  • an increased risk of bleeding
  • decreased blood platelets
  • low levels of a type of white blood cell called neutrophils
  • high blood pressure
  • pregnancy
  • a patient who is producing milk and breastfeeding
  • Child-Pugh class C liver impairment

Strengths: 80 mg

Lymphoma

  • 160 mg orally 2 times a day until or unacceptable toxicity
  • 320 mg orally once a day until disease or unacceptable toxicity
  • For the treatment of adult patients with mantle cell lymphoma (MCL) who have received at least one prior therapy
  • For the treatment of adult patients with Waldenström’s macroglobulinemia (WM)
  • For the treatment of adult patients with relapsed or refractory marginal zone lymphoma (MZL) who have received at least one anti-CD20-based regimen

Dose Adjustments

DOSE MODIFICATIONS FOR ADVERSE REACTIONS (starting dose of 160 mg 2 times a day OR 320 mg once a day):
FOR:

  • 1) GRADE 3 OR HIGHER NONHEMATOLOGICAL TOXICITIES
  • 2) GRADE 3 FEBRILE ; GRADE 3 WITH SIGNIFICANT BLEEDING OR
  • 3) GRADE 4 NEUTROPENIA (LASTING MORE THAN 10 CONSECUTIVE DAYS) OR
    4) GRADE 4 THROMBOCYTOPENIA (LASTING MORE THAN 10 CONSECUTIVE DAYS)

Below are dose modifications for the reactions 1 through 4 listed above:

  • First Occurrence: Interrupt therapy; when toxicity has resolved to Grade 1 or less or resume at 160 mg 2 times a day or 320 mg once a day
  • Second Occurrence: Interrupt therapy; when toxicity has resolved to Grade 1 or less or baseline resume at 80 mg 2 times a day or 160 mg once a day
  • Third Occurrence: Interrupt therapy; when toxicity has resolved to Grade 1 or less or baseline resume at 80 mg once a day
  • Fourth Occurrence: Discontinue therapy
  • lymphocytosis should not be regarded as an adverse reaction, and these patients should continue taking this drug.

Dose Modifications for Concomitant use with CYP450 3A Inhibitors or Inducers:

  • Strong CYP450 3A inhibitor: 80 mg orally once a day; interrupt dose as recommended for adverse reactions
  • CYP450 3A inhibitor: 80 mg orally 2 times a day; interrupt dose as recommended for adverse reactions
  • Moderate or strong CYP450 3A inducer: Avoid concomitant use.
  • After discontinuation of a CYP450 3A inhibitor, resume the previous dose of this drug.

Side Effects

The Most Common

  • muscle, joint, or
  • fever, sore throat, cough, chills, or other signs of infection
  • painful, frequent, or urgent urination
  • unusual bruising or bleeding
  • blood in your stools or black, tarry stools; pink or brown urine; vomiting blood or coffee-ground vomit; coughing up blood
  • feeling dizzy, weak, or confused; changes in speech; a headache that lasts a long time
  • fast or irregular heartbeat, palpitations, feeling lightheaded or dizzy, fainting, shortness of breath, chest pain

More Common

  • blood in your stools or black stools (looks like tar)
  • pink or brown urine
  • unexpected bleeding, or bleeding that is severe or you cannot control
  • vomit blood or vomit that looks like coffee grounds
  • cough up blood or blood clots
  • increased bruising
  • dizziness
  • weakness
  • confusion
  • change in speech
  • headache that lasts a long time

Rare

  • Infections that can be serious and may lead to death. Tell your healthcare provider right away if you have fever, chills, or flu-like symptoms.
  • Decrease in blood cell counts. Decreased blood counts (white blood cells, platelets, and red blood cells) are common with zanubrutinib, but can also be severe. Your healthcare provider should do blood tests during treatment with zanubrutinib to check your blood counts.
  • Second primary cancers. New cancers have happened in people during treatment with zanubrutinib, including cancers of the skin or other organs. Your healthcare provider will check you for other cancers during treatment with zanubrutinib. Use sun protection when you are outside in sunlight.
  • Heart rhythm problems (atrial fibrillation and atrial flutter). Tell your healthcare provider if you have any of the following signs or symptoms: your heartbeat is fast or irregular, feel lightheaded or dizzy, pass out (faint), shortness of breath, chest discomfort
  • decreased white blood cells
  • upper respiratory tract infection
  • decreased platelet count
  • bleeding
  • rash
  • muscle or joint pain

Drug Interaction

Pregnancy and Lactation

Pregnancy

Tell your doctor if you are pregnant or plan to become pregnant. Zanubrutinib can harm your unborn baby. If you are able to become pregnant, your healthcare provider may do a pregnancy test before starting treatment with zanubrutinib.

Females should avoid getting pregnant during treatment and for 1 week after the last dose of zanubrutinib. You should use effective birth control (contraception) during treatment and for 1 week after the last dose of zanubrutinib.

Males should avoid getting female partners pregnant during treatment and for 1 week after the last dose of zanubrutinib. You should use effective birth control (contraception) during treatment and for 1 week after the last dose of zanubrutinib.

Lactation

Tell your doctor if your are breastfeeding or plan to breastfeed. It is not known if zanubrutinib passes into your breast milk. Do not breastfeed during treatment with zanubrutinib and for 2 weeks after the last dose of zanubrutinib.

How should this medicine be used?

Zanubrutinib comes as a capsule to take by mouth. It is usually taken once or twice daily with or without food. Take zanubrutinib at around the same time(s) every day. Follow the directions on your prescription label carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take zanubrutinib exactly as directed. Do not take more or less of it or take it more often than prescribed by your doctor.

Swallow the capsules whole with a glass of water; do not open, chew, or crush them.

Your doctor may decrease your dose, or interrupt or discontinue your treatment. This depends on how well the medication works for you and the side effects you experience. Talk to your doctor about how you are feeling during your treatment. Continue to take zanubrutinib even if you feel well. Do not stop taking zanubrutinib without talking to your doctor.

Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient.

What special precautions should I follow?

Before taking zanubrutinib,

  • tell your doctor and pharmacist if you are allergic to zanubrutinib, any other medications, or any of the ingredients in zanubrutinib capsules. Ask your pharmacist for a list of the ingredients.
  • tell your doctor and pharmacist what other prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking or plan to take. Be sure to mention any of the following: anticoagulant medications (‘blood thinners’) such as warfarin (Coumadin, Jantoven); antifungals such as fluconazole (Diflucan), itraconazole (Onmel, Sporanox), or ketoconazole; aprepitant (Cinvanti, Emend); clarithromycin (Biaxin, in Prevpac); digoxin (Lanoxin); diltiazem (Cardizem, Cartia, Tiazac, others); erythromycin (E.E.S., Erythrocin, others); certain medications to treat human immunodeficiency virus (HIV) or acquired immunodeficiency syndrome (AIDS) such as efavirenz (Sustiva, in Atripla), nelfinavir (Viracept), ritonavir (Norvir, in Kaletra), and saquinavir (Invirase); nefazodone; omeprazole (Prilosec); phenobarbital; phenytoin (Dilantin, Phenytek); pioglitazone (Actos); rifampin (Rifadin, Rifamate, Rimactane, others); midazolam; and oral steroids such as dexamethasone, methylprednisolone (Medrol), and prednisone (Rayos). Your doctor may need to change the doses of your medications or monitor you carefully for side effects.
  • tell your doctor what herbal products you are taking, especially St. John’s Wort.
  • tell your doctor if you have an infection or recently had surgery. Also tell your doctor if you have or have ever had hepatitis B (HBV, a virus that infects the liver and may cause severe liver damage), an irregular heartbeat, high blood pressure, bleeding problems, or heart or liver disease.
  • tell your doctor if you are pregnant, plan to become pregnant, or if you plan on fathering a child. You should not become pregnant while you are taking zanubrutinib. If you are female, you will need to take a pregnancy test before you start treatment and should use birth control to prevent pregnancy during your treatment and for 1 week after your final dose. If you are male, you and your female partner should use birth control during your treatment with zanubrutinib and continue for 1 week after your final dose. If you or your partner become pregnant while taking zanubrutinib, call your doctor immediately. Zanubrutinib can cause fetal harm.
  • tell your doctor if you are breast-feeding. Do not breastfeed while you are taking zanubrutinib and for 2 weeks after your final dose.
  • if you are having surgery, including dental surgery, tell the doctor or dentist that you are taking zanubrutinib. Your doctor may tell you to stop taking zanubrutinib for a period of time before and after the surgery or procedure.
  • plan to avoid unnecessary or prolonged exposure to sunlight and to wear protective clothing, sunglasses, and sunscreen. Zanubrutinib may make your skin sensitive to the dangerous effects of sunlight and may increase your risk of developing skin cancer.

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Doctor visit helper

Prepare before seeing a doctor

A simple rural-patient checklist to help you explain symptoms clearly, ask better questions, and avoid unsafe self-treatment.

Safety note: This is not a prescription or diagnosis. For severe symptoms, pregnancy danger signs, children with serious illness, chest pain, breathing difficulty, stroke-like weakness, or major injury, seek urgent care.

Which doctor may help?

General physician, urologist, nephrologist, or gynecologist depending on symptoms.

What to tell the doctor

  • Write burning, frequency, fever, flank pain, blood in urine, pregnancy, diabetes, and previous UTI history.

Questions to ask

  • Is this UTI, stone, prostate problem, diabetes-related, or another cause?
  • Do I need urine culture before antibiotics?

Tests to discuss

  • Urine routine/microscopy
  • Urine culture for recurrent/severe infection or treatment failure
  • Blood sugar and kidney function when indicated
  • Ultrasound if stone/obstruction/recurrent symptoms

Avoid these mistakes

  • Avoid self-starting antibiotics; wrong antibiotic can cause resistance.
  • Seek urgent care for fever with flank pain, pregnancy, vomiting, confusion, or inability to pass urine.

Medicine safety and first-aid guide

This section is for patient education only. It does not replace a doctor, pharmacist, or emergency care.

Safe first steps

  • Avoid heavy lifting, sudden bending, and prolonged bed rest.
  • Use comfortable posture and gentle movement as tolerated.
  • Discuss physiotherapy, X-ray, or MRI only when clinically needed.

OTC medicine safety

  • For mild back pain, pain-relief medicine may be discussed with a doctor or pharmacist.
  • Avoid repeated painkiller use if you have kidney disease, stomach ulcer, uncontrolled blood pressure, or are taking blood thinners.

Avoid these mistakes

  • Do not start antibiotics without a proper medical decision.
  • Do not use steroid tablets or injections casually for quick relief.
  • Do not delay emergency care because of home remedies.

Get urgent help if

  • Back pain with leg weakness, numbness around private area, loss of urine/stool control, fever, cancer history, or major injury needs urgent care.
Medicine names, dose, and timing must be decided by a qualified clinician or pharmacist after checking age, pregnancy, allergy, other diseases, and current medicines.

For rural patients and family caregivers

Patient health record and symptom diary

Write your symptoms, medicines already taken, test results, and questions before visiting a doctor. This note stays on your device unless you print or copy it.

Doctor to discuss: Orthopedic / spine specialist, physical medicine doctor, or qualified clinician
Tests to discuss with doctor
  • Neurological examination for leg power, sensation, reflexes, and straight leg raise
  • X-ray only if injury, deformity, long-lasting pain, or doctor suspects bone problem
  • MRI discussion if severe nerve symptoms, weakness, bladder/bowel problem, or persistent symptoms
Questions to ask
  • What is the most likely cause of my symptoms?
  • Which warning signs mean I should go to emergency care?
  • Which tests are really needed now?
  • Which medicines are safe for my age, pregnancy status, allergy, kidney/liver/stomach condition, and current medicines?
  • Is physiotherapy, posture correction, or activity modification needed?

Emergency warning signs such as chest pain, severe breathing difficulty, sudden weakness, confusion, severe dehydration, major injury, or loss of bladder/bowel control need urgent medical care. Do not wait for online information.

Safe pathway to proper treatment

Care roadmap for: Zanubrutinib – Uses, Dosage, Side Effects, Interaction

Use this simple roadmap to understand the next safe steps. It is educational and does not replace examination by a doctor.

Go to emergency care if you notice:
  • Severe or rapidly worsening symptoms
  • Breathing difficulty, chest pain, fainting, confusion, severe weakness, major injury, or severe dehydration
Doctor / service to discuss: Qualified healthcare provider; specialist depends on symptoms and examination.
  1. Step 1

    Check danger signs first

    If danger signs are present, seek emergency care and do not wait for online information.

  2. Step 2

    Record the symptom story

    Write when symptoms started, severity, medicines already taken, allergies, pregnancy status, and test results.

  3. Step 3

    Visit a qualified clinician

    A doctor, nurse, or qualified healthcare provider can examine you and decide which tests or treatment are needed.

  4. Step 4

    Do only useful tests

    Do tests after clinical assessment. Avoid unnecessary tests, random antibiotics, or repeated medicines without diagnosis.

  5. Step 5

    Follow up and return early if worse

    If symptoms worsen, new warning signs appear, or treatment is not helping, return for review quickly.

Rural patient practical tips
  • Take a written symptom diary and all previous prescriptions/test reports.
  • Do not hide medicines already taken, even herbal or over-the-counter medicines.
  • Ask which warning signs mean urgent referral to hospital.

This roadmap is for education. A real diagnosis and treatment plan requires history, examination, and clinical judgment.