TYRUKO natalizumab-sztn 300 mg/15mL Injection
🆔 Identity & classification
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🏷️ RxNorm drug class
This medicine belongs to the Integrin Receptor Antagonist class.
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🏭 Manufacturer & labeler
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🩺 Clinical
Natalizumab injection products are used to prevent episodes of symptoms and slow the worsening of disability in adults who have relapsing forms of multiple sclerosis (MS; a disease in which the nerves do not function properly and people may experience weakness, numbness, loss of muscle coordination, and problems with vision, speech, and bladder control), including: clinically isolated syndrome (CIS; first nerve symptom episode that lasts at least 24 hours), relapsing-remitting disease (course of disease where symptoms flare up from time to time), active secondary progressive disease (later...
Read the full MedlinePlus article ↗- Tysabri is only available through a program called the TOUCH Prescribing Program because of a serious — though rare — risk of a brain infection called PML. This program makes sure...
- Why do I have to go to a special program just to get this medication?
- PML stands for progressive multifocal leukoencephalopathy — it's a rare but serious brain infection caused by a virus called JC virus. Early warning signs can be subtle and include...
- What is PML and how would I know if I was getting it?
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🧪 Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.
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6.36 mg / 15 mL
UNII 4QD397987E
An amino acid used as a buffer and stabilizer in medications. It helps maintain the pH balance and protects the active drug from breaking down during storage and use.
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22.86 mg / 15 mL
UNII X573657P6P
Histidine monohydrochloride monohydrate is an amino acid salt used as a buffer in medicines. It helps maintain the proper acidity level of liquid formulations to keep the drug stable and effective.
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3 mg / 15 mL
UNII 6OZP39ZG8H
Polysorbate 80 is a synthetic emulsifier derived from sorbitol and oleic acid. It helps mix oil and water-based ingredients together in medications and improves how the product disperses in the body.
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131.49 mg / 15 mL
UNII 451W47IQ8X
Sodium chloride is common table salt. It's used in medicines as a buffer to maintain proper pH, as a filler to add bulk, or to adjust the osmotic balance in liquid formulations.
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UNII 059QF0KO0R
Water is a liquid solvent that dissolves and mixes ingredients together in liquid medicines, syrups, and injections. It helps distribute the active drug evenly throughout the product.
5 inactive ingredients listed in the exact product block matched to this NDC.
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ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.Inactive ingredient FAQ
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💲 Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per each | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | Not in the retail survey — common for institutional, discontinued, or low-volume packs. | |
| Medicaid paysCMS SDUD · 12 mo | No recent Medicaid claims on file for this NDC — rare and low-volume NDCs are suppressed in the public data. | |
| Medicare drug plans payPart D · quarterly | No Part D plan price is available for this NDC in our data. | |
| Medicare Part B allowsASP · Q5134 | $24.494 / Q5134 unit | — |
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🧾 Billing & reimbursement
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🔁 Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Tyruko 300 mg/15mLthis 61314-0543-94 | Sandoz | 1 vial | — | — | FDA listed | — |
Where does this data come from?
⏳ Availability & biosimilar status
1 biosimilar is FDA-licensed for this reference biologic — see the list below. (Biologics have no small-molecule generics.)
Why the date isn’t exact: Biosimilar timing can change because patents may be challenged, settled, licensed, added or removed, and litigation can move the real date earlier or later.
🛈 What do these terms mean?
- Biologic patent
- A patent the reference product’s maker has publicly listed. A biosimilar generally can’t launch until these expire — unless they’re invalidated or resolved in a settlement.
- Reference-product exclusivity
- A flat 12 years of FDA market protection from the biologic’s first licensure (the BPCIA). No biosimilar can be licensed before it ends, regardless of patents.
- Interchangeable exclusivity
- The first interchangeable biosimilar can earn a period as the only interchangeable version (pharmacists can substitute it without the prescriber).
- Earliest biosimilar (LOE)
- The latest of all the dates above — the soonest a biosimilar can realistically reach the market. Litigation and settlements can move it earlier.
Biologics have no small-molecule “generics” — competition comes from FDA-licensed biosimilars, tracked in the FDA Purple Book.
| Code | What it grants | Expires |
|---|---|---|
| RefProduct | Reference-product exclusivity (12-year, BPCIA) — no biosimilar can be licensed before this date | Aug 24, 2035 |
Is there a biosimilar for TYRUKO 300 MG/15 ML VIAL?
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📦 Packaging — all sizes for this product
| Package NDC | Description | Marketing start | Status |
|---|---|---|---|
| 61314-0543-94 You're viewing this | 1 VIAL, SINGLE-DOSE in 1 CARTON (61314-543-94) / 15 mL in 1 VIAL, SINGLE-DOSE | 2025-11-17 | Active |
🧭 About this NDC listing & data coverage
What data is (and isn’t) available for this NDC — tap to expand
| NDC identity (package / product / labeler codes) | ✓ Available |
| Labeler | ✓ Available |
| Product & package description | ✓ Available |
| Marketing category & status | ✓ Available |
| Active ingredient / dosage form / route | ✓ Available |
| FDA label (SPL via DailyMed) | ✓ Available |
| Package photos | ✓ Available |
| Inactive ingredients (structured) | ✓ Available |
| NADAC pharmacy acquisition price (CMS) | — Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey. |
| Orange Book / therapeutic-equivalence data | ✓ Available |
| HCPCS J-code billing crosswalk | ✓ Available |
| Medicaid utilization (CMS SDUD) | — Not published for this NDC CMS reports utilization only for NDCs with Medicaid claims above its privacy threshold. |
Questions about this listing
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📄 Full prescribing information FDA SPL
🚨 Boxed Warning ▾
WARNING: PROGRESSIVE MULTIFOCAL LEUKOENCEPHALOPATHY Natalizumab products increase the risk of progressive multifocal leukoencephalopathy (PML), an opportunistic viral infection of the brain that usually leads to death or severe disability. Risk factors for the development of PML include the presence of anti-JCV antibodies, duration of therapy, and prior use of immunosuppressants. These factors should be considered in the context of expected benefit when initiating and continuing treatment with TYRUKO [see Warnings and Precautions ( 5.1 )] . - Healthcare professionals should monitor patients on TYRUKO for any new sign or symptom that may be suggestive of PML.
TYRUKO dosing should be withheld immediately at the first sign or symptom suggestive of PML. For diagnosis, an evaluation that includes a gadolinium-enhanced magnetic resonance imaging (MRI) scan of the brain and, when indicated, cerebrospinal fluid analysis for JC viral DNA are recommended [see Contraindications ( 4 ), Warnings and Precautions ( 5.1 )] . - Because of the risk of PML, TYRUKO is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the TYRUKO REMS Program [see Warnings and Precautions ( 5.2 )] .
WARNING: PROGRESSIVE MULTIFOCAL LEUKOENCEPHALOPATHY See full prescribing information for complete boxed warning • Natalizumab products increase the risk of progressive multifocal leukoencephalopathy (PML), an opportunistic viral infection of the brain that usually leads to death or severe disability ( 5.1 ). • Risk factors for the development of PML include the presence of anti-JCV antibodies, duration of therapy, and prior use of immunosuppressants. These factors should be considered in the context of expected benefit when initiating and continuing treatment with TYRUKO ( 5.1 ). • Monitor patients, and withhold TYRUKO immediately at the first sign or symptom suggestive of PML ( 4 , 5.1 ). • Because of the risk of PML, TYRUKO is available only through a restricted distribution program called the TYRUKO REMS Program ( 5.1 , 5.2 ).
🎯 Indications and Usage ▾
1 INDICATIONS AND USAGE TYRUKO is an integrin receptor antagonist indicated for treatment of: Multiple Sclerosis (MS) TYRUKO is indicated as monotherapy for the treatment of relapsing forms of multiple sclerosis, to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease, in adults. Natalizumab products increase the risk of PML [see Warnings and Precautions ( 5.1 )] . When initiating and continuing treatment with TYRUKO, physicians should consider whether the expected benefit of TYRUKO is sufficient to offset this risk.
( 1.1 ) Crohn's Disease (CD) • TYRUKO is indicated for inducing and maintaining clinical response and remission in adult patients with moderately to severely active Crohn's disease with evidence of inflammation who have had an inadequate response to, or are unable to tolerate, conventional CD therapies and inhibitors of TNF-α. ( 1.2 ) Important Limitations: • In CD, TYRUKO should not be used in combination with immunosuppressants or inhibitors of TNF-α. ( 1.2 )
1.1Multiple Sclerosis (MS) TYRUKO is indicated as monotherapy for the treatment of relapsing forms of multiple sclerosis, to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease, in adults. Natalizumab products increase the risk of PML [see Warnings and Precautions ( 5.1 )] . When initiating and continuing treatment with TYRUKO, physicians should consider whether the expected benefit of TYRUKO is sufficient to offset this risk.
1.2Crohn's Disease (CD) TYRUKO is indicated for inducing and maintaining clinical response and remission in adult patients with moderately to severely active Crohn’s disease with evidence of inflammation who have had an inadequate response to, or are unable to tolerate, conventional CD therapies and inhibitors of TNF-α. TYRUKO should not be used in combination with immunosuppressants (e.g., 6-mercaptopurine, azathioprine, cyclosporine, or methotrexate) or inhibitors of TNF-α [see Warnings and Precautions ( 5.1 )] .
⏱️ Dosage and Administration ▾
2 DOSAGE AND ADMINISTRATION • 300 mg infused intravenously over one hour, every four weeks. Do not give as an intravenous push or bolus. ( 2.1 , 2.2 ) • TYRUKO solution must be administered within 4 hours of preparation.
( 2.3 ) • Observe patients during all infusions. Post-infusion, for the first 12 infusions, observe patients for one hour after the infusion is complete. For patients who have received 12 infusions without evidence of a hypersensitivity reaction, observe patients post-infusion for the 13th and subsequent infusions according to clinical judgment.
( 2.4 ) • In CD, discontinue in patients that have not experienced therapeutic benefit by 12 weeks of induction therapy, and in patients that cannot discontinue chronic concomitant steroids within six months of starting therapy. ( 2.2 )
2.1Multiple Sclerosis (MS) Only prescribers registered in the MS TYRUKO REMS Program may prescribe TYRUKO for multiple sclerosis [see Warnings and Precautions ( 5.2 )] . The recommended dose of TYRUKO for multiple sclerosis is 300 mg intravenous infusion over one hour every four weeks.
2.2Crohn's Disease (CD) Only prescribers registered in the CD TYRUKO REMS Program may prescribe TYRUKO for Crohn’s disease [see Warnings and Precautions ( 5.2 )] . The recommended dose of TYRUKO for Crohn’s disease is 300 mg intravenous infusion over one hour every four weeks. TYRUKO should not be used with concomitant immunosuppressants (e.g., 6-mercaptopurine, azathioprine, cyclosporine, or methotrexate) or concomitant inhibitors of TNF-α.
Aminosalicylates may be continued during treatment with TYRUKO. If the patient with Crohn’s disease has not experienced therapeutic benefit by 12 weeks of induction therapy, discontinue TYRUKO. For patients with Crohn’s disease who start TYRUKO while on chronic oral corticosteroids, commence steroid tapering as soon as a therapeutic benefit of TYRUKO has occurred; if the patient with Crohn’s disease cannot be tapered off of oral corticosteroids within six months of starting TYRUKO, discontinue TYRUKO.
Other than the initial six-month taper, prescribers should consider discontinuing TYRUKO for patients who require additional steroid use that exceeds three months in a calendar year to control their Crohn’s disease.
2.3Dilution Instructions 1. Use aseptic technique when preparing TYRUKO solution for intravenous infusion. Each vial is intended for single use only.
Discard any unused portion. 2. TYRUKO is a colorless and clear to slightly opalescent solution.
Inspect the TYRUKO vial for particulate material and discoloration prior to dilution and administration. If visible particulates are observed and/or the liquid in the vial is discolored, the vial must not be used. 3.
To prepare the diluted solution, withdraw 15 mL of TYRUKO from the vial using a sterile needle and syringe. Inject TYRUKO into 100 mL of 0.9% Sodium Chloride Injection, USP. No other intravenous diluents may be used to prepare the TYRUKO diluted solution.
4. Gently invert the TYRUKO diluted solution to mix completely. Do not shake.
Inspect the solution visually for particulate material prior to administration. 5. The final dosage diluted solution has a concentration of 2.6 mg/mL.
6. Following dilution, infuse TYRUKO solution immediately, or refrigerate the diluted solution at 2°C to 8°C, and use within 4 hours. If stored at 2°C to 8°C, allow the diluted solution to warm to room temperature prior to infusion.
DO NOT FREEZE.
2.4Administration Instructions • Infuse TYRUKO 300 mg in 100 mL 0.9% Sodium Chloride Injection, USP, over approximately one hour (infusion rate approximately 5 mg per minute). Do not administer TYRUKO as an intravenous push or bolus injection. After the infusion is complete, flush with 0.9% Sodium Chloride Injection, USP. • Observe patients during all infusions.
Promptly discontinue the infusion upon the first observation of any signs or symptoms consistent with a hypersensitivity-type reaction [see Warnings and Precautions ( 5.5 )]…
💊 Dosage Forms and Strengths ▾
3 DOSAGE FORMS AND STRENGTHS Injection: 300 mg/15 mL (20 mg/mL) colorless and clear to slightly opalescent solution in a single-dose vial for dilution prior to infusion. Injection: 300 mg/15 mL (20 mg/mL) solution in a single-dose vial for dilution prior to infusion ( 3 )
⛔ Contraindications ▾
4 CONTRAINDICATIONS • TYRUKO is contraindicated in patients who have or have had progressive multifocal leukoencephalopathy (PML) [see Warnings and Precautions ( 5.1 )] . • TYRUKO is contraindicated in patients who have had a hypersensitivity reaction to natalizumab products or any of the ingredients in TYRUKO. Observed reactions range from urticaria to anaphylaxis [see Warnings and Precautions ( 5.5 )] . • Patients who have or have had PML ( 4 ) • Patients who have had a hypersensitivity reaction to natalizumab products ( 4 , 5.3 )
⚠️ Warnings and Cautions ▾
5 WARNINGS AND PRECAUTIONS • Herpes infections: Life-threatening and fatal cases have occurred with herpes encephalitis and meningitis infections. Blindness has occurred in patients developing acute retinal necrosis. Discontinue TYRUKO if these infections occur and treat appropriately.
( 5.3 ) • Hepatotoxicity: Significant liver injury, including liver failure requiring transplant, has occurred. Discontinue TYRUKO in patients with evidence of liver injury. ( 5.4 ) • Hypersensitivity reactions: Serious hypersensitivity reactions (e.g., anaphylaxis) have occurred.
Permanently discontinue TYRUKO if such a reaction occurs. ( 5.5 ) • Immunosuppression/Infections: Natalizumab products may increase the risk for certain infections. Monitor patients for development of infections due to increased risk with use of TYRUKO.
( 5.6 ) • Hematological abnormalities: Natalizumab products may cause thrombocytopenia. Monitor patients for bleeding abnormalities. Discontinue TYRUKO in patients with thrombocytopenia.
Neonatal thrombocytopenia and anemia have also occurred. Obtain a complete blood count in neonates exposed to TYRUKO in utero. ( 5.8 )
5.1Progressive Multifocal Leukoencephalopathy Progressive multifocal leukoencephalopathy (PML), an opportunistic viral infection of the brain caused by the JC virus (JCV) that typically only occurs in patients who are immunocompromised, and that usually leads to death or severe disability, has occurred in patients who have received natalizumab products. Three factors that are known to increase the risk of PML in natalizumab-treated patients have been identified: • The presence of anti-JCV antibodies. Patients who are anti-JCV antibody positive have a higher risk for developing PML. • Longer treatment duration, especially beyond 2 years. • Prior treatment with an immunosuppressant (e.g., mitoxantrone, azathioprine, methotrexate, cyclophosphamide, mycophenolate mofetil).
These factors should be considered in the context of expected benefit when initiating and continuing treatment with TYRUKO. Table 1: Estimated United States Incidence of PML Stratified by Risk Factor Anti-JCV Antibody Negative Natalizumab Exposure Anti-JCV Antibody Positive No Prior Immunosuppressant Use Prior Immunosuppressant Use 1/10,000 1-24 months <1/1,000 1/1,000 25-48 months 2/1,000 6/1,000 49-72 months 4/1,000 7/1,000 73-96 months 2/1,000 6/1,000 Notes: The risk estimates are based on postmarketing data in the United States from approximately 100,000 natalizumab exposed patients.
The anti-JCV antibody status was determined using an anti-JCV antibody test (ELISA) that has been analytically and clinically validated and is configured with detection and inhibition steps to confirm the presence of JCV-specific antibodies with an analytical false negative rate of 3%. Retrospective analyses of postmarketing data from various sources, including observational studies and spontaneous reports obtained worldwide, suggest that the risk of developing PML may be associated with relative levels of serum anti-JCV antibody compared to a calibrator as measured by ELISA (often described as an anti-JCV antibody index value).
Ordinarily, patients receiving chronic immunosuppressant or immunomodulatory therapy or who have systemic medical conditions resulting in significantly compromised immune system function should not be treated with TYRUKO. Infection by the JC virus is required for the development of PML. Anti-JCV antibody testing should not be used to diagnose PML.
Anti-JCV antibody negative status indicates that antibodies to the JC virus have not been detected. Patients who are anti-JCV antibody negative have a lower risk of PML than those who are positive. Patients who are anti-JCV antibody negative are still at risk for the development of PML due to the potential for a new JCV infection or a false negative test result.
The reported rate of seroconversion in patients with MS (changing from anti-JCV antibody negative to positive and remaining pos…
🤒 Adverse Reactions ▾
6 ADVERSE REACTIONS The following serious adverse reactions are described below and elsewhere in the labeling: • Progressive Multifocal Leukoencephalopathy (PML) [see Warnings and Precautions ( 5.1 )] • Herpes Infections [see Warnings and Precautions ( 5.3 )] • Hepatotoxicity [see Warnings and Precautions ( 5.4 )] • Hypersensitivity/Antibody Formation [see Warnings and Precautions ( 5.5 )] • Immunosuppression/Infections [see Warnings and Precautions ( 5.6 )] • Hematological Abnormalities [see Warnings and Precautions ( 5.8 )] Most common adverse reactions (incidence ≥ 10%): • MS - headache, fatigue, arthralgia, urinary tract infection, lower respiratory tract infection, gastroenteritis, vaginitis, depression, pain in extremity, abdominal discomfort, diarrhea NOS, and rash ( 6.1 ) • CD - headache, upper respiratory tract infections, nausea, and fatigue ( 6.1 ) To report SUSPECTED ADVERSE REACTIONS, contact Sandoz Inc. at 1-800-525-8747 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
6.1Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. The most common adverse reactions (incidence ≥10%) were headache and fatigue in both the multiple sclerosis (MS) and Crohn’s disease (CD) studies. Other common adverse reactions (incidence ≥10%) in the MS population were arthralgia, urinary tract infection, lower respiratory tract infection, gastroenteritis, vaginitis, depression, pain in extremity, abdominal discomfort, diarrhea NOS, and rash.
Other common adverse reactions (incidence ≥10%) in the CD population were upper respiratory tract infections and nausea. The most frequently reported adverse reactions resulting in clinical intervention (i.e., discontinuation of natalizumab) in the MS studies were urticaria (1%) and other hypersensitivity reactions (1%), and in the CD studies (Studies CD1 and CD2) were the exacerbation of Crohn’s disease (4.2%) and acute hypersensitivity reactions (1.5%) [see Warnings and Precautions ( 5.5 )] . A total of 1617 multiple sclerosis patients in controlled studies received natalizumab, with a median duration of exposure of 28 months.
A total of 1563 patients received natalizumab in all CD studies for a median exposure of 5 months; of these patients, 33% (n=518) received at least one year of treatment and 19% (n=297) received at least two years of treatment. Multiple Sclerosis Clinical Studies The most common serious adverse reactions in Study MS1 [see Clinical Studies ( 14.1 )] with natalizumab were infections (3.2% versus 2.6% in placebo, including urinary tract infection [0.8% versus 0.3%] and pneumonia [0.6% versus 0%]), acute hypersensitivity reactions (1.1% versus 0.3%, including anaphylaxis/anaphylactoid reaction [0.8% versus 0%]), depression (1.0% versus 1.0%, including suicidal ideation or attempt [0.6% versus 0.3%]), and cholelithiasis (1.0% versus 0.3%).
In Study MS2, serious adverse reactions of appendicitis were also more common in patients who received natalizumab (0.8% versus 0.2% in placebo). Table 2 enumerates adverse reactions and selected laboratory abnormalities that occurred in Study MS1 at an incidence of at least 1 percentage point higher in natalizumab-treated patients than was observed in placebo-treated patients. Table 2: Adverse Reactions in Study MS1 (Monotherapy Study) Adverse Reactions (Preferred Term) Natalizumab (n=627) % Placebo (n=312) % *Percentage based on female patients only. ** Acute versus other hypersensitivity reactions are defined as occurring within 2 hours post-infusion versus more than 2 hours.
General Headache 38 33 Fatigue 27 21 Arthralgia 19 14 Chest discomfort 5 3 Other hypersensitivity reactions** 5 2 Acute hypersensitivity reactions** 4 <1 Seasonal allergy 3 2 Rigors 3 <1 Weight increased 2 <1 Weight decreased 2 <1 Infecti…
🔄 Drug Interactions ▾
7 DRUG INTERACTIONS Because of the potential for increased risk of PML and other infections, Crohn’s disease patients receiving natalizumab products should not be treated with concomitant immunosuppressants (e.g., 6‑ mercaptopurine, azathioprine, cyclosporine, or methotrexate) or inhibitors of TNF-α, and corticosteroids should be tapered in those patients with Crohn’s disease who are on chronic corticosteroids when they start TYRUKO therapy [see Indications and Usage ( 1.2 ) and Warnings and Precautions ( 5.1 , 5.6 )] .
Ordinarily, MS patients receiving chronic immunosuppressant or immunomodulatory therapy should not be treated with TYRUKO [see Indications and Usage ( 1.1 ) and Warnings and Precautions ( 5.1 , 5.6 )] .
👥 Use in Specific Populations ▾
8 USE IN SPECIFIC POPULATIONS Pregnancy: Can cause fetal harm. ( 5.8 , 8.1 ) *Biosimilar means that the biological product is approved based on data demonstrating that it is highly similar to an FDA-approved biological product, known as a reference product, and that there are no clinically meaningful differences between the biosimilar product and the reference product. Biosimilarity of TYRUKO has been demonstrated for the condition(s) of use (e.g., indication(s), dosing regimen(s)), strength(s), dosage form(s), and route(s) of administration described in its Full Prescribing Information.
8.1Pregnancy Risk Summary There are no adequate data on the risk of major birth defects, miscarriage, or other adverse maternal outcomes associated with the use of natalizumab products in pregnant women. Adverse fetal outcomes of neonatal thrombocytopenia and anemia have been reported (see Clinical Considerations ) . In animal studies, administration of natalizumab during pregnancy produced fetal immunologic and hematologic effects in monkeys at doses similar to the human dose and reduced offspring survival in guinea pigs at doses greater than the human dose.
These doses were not maternally toxic but produced the expected pharmacological effects in maternal animals ( see Data ). In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively. The background risk of major birth defects and miscarriage for the indicated population is unknown.
Clinical Considerations Fetal/Neonatal Adverse Reactions Cases of neonatal thrombocytopenia and anemia in infants born to women exposed to natalizumab products during pregnancy were reported in the post-marketing setting [see Warnings and Precautions ( 5.8 )] . Therefore, a CBC should be obtained in neonates who were exposed to TYRUKO in utero. Data Animal Data In developmental toxicity studies conducted in guinea pigs and monkeys, at natalizumab doses up to 30 mg/kg (7 times the recommended human dose based on body weight [mg/kg]), transplacental transfer and in utero exposure of the embryo/fetus was demonstrated in both species.
In a study in which pregnant guinea pigs were administered natalizumab (0, 3, 10, or 30 mg/kg) by intravenous (IV) infusion on alternate days throughout organogenesis (gestation days [GD] 4‑30), no effects on embryofetal development were observed. When pregnant monkeys were administered natalizumab (0, 3, 10, or 30 mg/kg) by IV infusion on alternative days throughout organogenesis (GDs 20-70), serum levels in fetuses at delivery were approximately 35% of maternal serum natalizumab levels. There were no effects on embryofetal development; however, natalizumab-related immunological and hematologic changes were observed in the fetuses at the two highest doses.
These changes included decreases in lymphocytes (CD3+ and CD20+), changes in lymphocyte subpopulation percentages, mild anemia, reduced platelet count, increased spleen weights, and reduced liver and thymus weights associated with increased splenic extramedullary hematopoiesis, thymic atrophy, and decreased hepatic hematopoiesis. In a study in which monkeys were exposed to natalizumab during pregnancy (IV infusion of 30 mg/kg) on alternate days from GD20 to GD70 or GD20 to term, abortions were increased approximately 2-fold compared to controls.
In offspring born to mothers administered natalizumab on alternate days from GD20 until delivery, hematologic effects (decreased lymphocyte and platelet counts) were also observed. These effects were reversed upon clearance of natalizumab. There was no evidence of anemia in these offspring.
Offspring exposed in utero and during lactation had a normal immune response to challenge with a T-cell dependent antigen. In a study in which pregnant guinea pigs were exposed to natalizumab (30 mg/kg IV) on alternate dates during GDs 30-64, a reduction in pup survival was observed.
8.2 Lactat…
🤰 Pregnancy ▾
8.1Pregnancy Risk Summary There are no adequate data on the risk of major birth defects, miscarriage, or other adverse maternal outcomes associated with the use of natalizumab products in pregnant women. Adverse fetal outcomes of neonatal thrombocytopenia and anemia have been reported (see Clinical Considerations ) . In animal studies, administration of natalizumab during pregnancy produced fetal immunologic and hematologic effects in monkeys at doses similar to the human dose and reduced offspring survival in guinea pigs at doses greater than the human dose.
These doses were not maternally toxic but produced the expected pharmacological effects in maternal animals ( see Data ). In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2-4% and 15-20%, respectively. The background risk of major birth defects and miscarriage for the indicated population is unknown.
Clinical Considerations Fetal/Neonatal Adverse Reactions Cases of neonatal thrombocytopenia and anemia in infants born to women exposed to natalizumab products during pregnancy were reported in the post-marketing setting [see Warnings and Precautions ( 5.8 )] . Therefore, a CBC should be obtained in neonates who were exposed to TYRUKO in utero. Data Animal Data In developmental toxicity studies conducted in guinea pigs and monkeys, at natalizumab doses up to 30 mg/kg (7 times the recommended human dose based on body weight [mg/kg]), transplacental transfer and in utero exposure of the embryo/fetus was demonstrated in both species.
In a study in which pregnant guinea pigs were administered natalizumab (0, 3, 10, or 30 mg/kg) by intravenous (IV) infusion on alternate days throughout organogenesis (gestation days [GD] 4‑30), no effects on embryofetal development were observed. When pregnant monkeys were administered natalizumab (0, 3, 10, or 30 mg/kg) by IV infusion on alternative days throughout organogenesis (GDs 20-70), serum levels in fetuses at delivery were approximately 35% of maternal serum natalizumab levels. There were no effects on embryofetal development; however, natalizumab-related immunological and hematologic changes were observed in the fetuses at the two highest doses.
These changes included decreases in lymphocytes (CD3+ and CD20+), changes in lymphocyte subpopulation percentages, mild anemia, reduced platelet count, increased spleen weights, and reduced liver and thymus weights associated with increased splenic extramedullary hematopoiesis, thymic atrophy, and decreased hepatic hematopoiesis. In a study in which monkeys were exposed to natalizumab during pregnancy (IV infusion of 30 mg/kg) on alternate days from GD20 to GD70 or GD20 to term, abortions were increased approximately 2-fold compared to controls.
In offspring born to mothers administered natalizumab on alternate days from GD20 until delivery, hematologic effects (decreased lymphocyte and platelet counts) were also observed. These effects were reversed upon clearance of natalizumab. There was no evidence of anemia in these offspring.
Offspring exposed in utero and during lactation had a normal immune response to challenge with a T-cell dependent antigen. In a study in which pregnant guinea pigs were exposed to natalizumab (30 mg/kg IV) on alternate dates during GDs 30-64, a reduction in pup survival was observed.
🧒 Pediatric Use ▾
8.4Pediatric Use Safety and effectiveness in pediatric patients with multiple sclerosis or Crohn's disease below the age of 18 years have not been established. TYRUKO is not indicated for use in pediatric patients.
🧓 Geriatric Use ▾
8.5Geriatric Use Clinical studies of natalizumab did not include sufficient numbers of patients aged 65 years and over to determine whether they respond differently than younger patients. Other reported clinical experience has not identified differences in responses between the elderly and younger patients.
🆘 Overdosage ▾
10 OVERDOSAGE Safety of doses higher than 300 mg has not been adequately evaluated. The maximum amount of natalizumab products that can be safely administered has not been determined.
🧬 Clinical Pharmacology ▾
12 CLINICAL PHARMACOLOGY
12.1Mechanism of Action Natalizumab products bind to the α4-subunit of α4β1 and α4β7 integrins expressed on the surface of all leukocytes except neutrophils, and inhibits the α4-mediated adhesion of leukocytes to their counter-receptor(s). The receptors for the α4 family of integrins include vascular cell adhesion molecule-1 (VCAM-1), which is expressed on activated vascular endothelium, and mucosal addressin cell adhesion molecule-1 (MAdCAM-1) present on vascular endothelial cells of the gastrointestinal tract. Disruption of these molecular interactions prevents transmigration of leukocytes across the endothelium into inflamed parenchymal tissue.
In vitro , anti-α4-integrin antibodies also block α4‑mediated cell binding to ligands such as osteopontin and an alternatively spliced domain of fibronectin, connecting segment-1 (CS-1). In vivo , natalizumab products may further act to inhibit the interaction of α4-expressing leukocytes with their ligand(s) in the extracellular matrix and on parenchymal cells, thereby inhibiting further recruitment and inflammatory activity of activated immune cells. The specific mechanism(s) by which natalizumab products exert their effects in multiple sclerosis and Crohn’s disease have not been fully defined.
In multiple sclerosis, lesions are believed to occur when activated inflammatory cells, including T-lymphocytes, cross the blood-brain barrier (BBB). Leukocyte migration across the BBB involves interaction between adhesion molecules on inflammatory cells and their counter-receptors present on endothelial cells of the vessel wall. The clinical effect of natalizumab products in multiple sclerosis may be secondary to blockade of the molecular interaction of α4β1-integrin expressed by inflammatory cells with VCAM-1 on vascular endothelial cells, and with CS-1 and/or osteopontin expressed by parenchymal cells in the brain.
Data from an experimental autoimmune encephalitis animal model of multiple sclerosis demonstrate reduction of leukocyte migration into brain parenchyma and reduction of plaque formation detected by magnetic resonance imaging (MRI) following repeated administration of natalizumab. The clinical significance of these animal data is unknown. In Crohn’s disease, the interaction of the α4β7-integrin with the endothelial receptor MAdCAM‑1 has been implicated as an important contributor to the chronic inflammation that is a hallmark of the disease.
MAdCAM-1 is mainly expressed on gut endothelial cells and plays a critical role in the homing of T lymphocytes to gut lymph tissue found in Peyer’s patches. MAdCAM-1 expression has been found to be increased at active sites of inflammation in patients with CD, which suggests it may play a role in the recruitment of leukocytes to the mucosa and contribute to the inflammatory response characteristic of CD. The clinical effect of natalizumab products in CD may therefore be secondary to blockade of the molecular interaction of the α4β7-integrin receptor with MAdCAM-1 expressed on the venular endothelium at inflammatory foci.
VCAM-1 expression has been found to be upregulated on colonic endothelial cells in a mouse model of IBD and appears to play a role in leukocyte recruitment to sites of inflammation. The role of VCAM-1 in CD, however, is not clear.
12.2Pharmacodynamics Administration of natalizumab products increases the number of circulating leukocytes (including lymphocytes, monocytes, basophils, and eosinophils) due to inhibition of transmigration out of the vascular space. Natalizumab products do not affect the absolute count of circulating neutrophils [see Warnings and Precautions ( 5.7 )] .
12.3Pharmacokinetics Multiple Sclerosis (MS) Patients In patients with MS, following the repeat intravenous administration of a 300 mg dose of natalizumab, the mean ± SD maximum observed serum concentration was 110 ± 52 mcg/mL. Mean average steady-state trough concentrations ranged from 23 mcg/mL to 29 mcg/mL. The observed…
🧬 Mechanism of Action ▾
12.1Mechanism of Action Natalizumab products bind to the α4-subunit of α4β1 and α4β7 integrins expressed on the surface of all leukocytes except neutrophils, and inhibits the α4-mediated adhesion of leukocytes to their counter-receptor(s). The receptors for the α4 family of integrins include vascular cell adhesion molecule-1 (VCAM-1), which is expressed on activated vascular endothelium, and mucosal addressin cell adhesion molecule-1 (MAdCAM-1) present on vascular endothelial cells of the gastrointestinal tract. Disruption of these molecular interactions prevents transmigration of leukocytes across the endothelium into inflamed parenchymal tissue.
In vitro , anti-α4-integrin antibodies also block α4‑mediated cell binding to ligands such as osteopontin and an alternatively spliced domain of fibronectin, connecting segment-1 (CS-1). In vivo , natalizumab products may further act to inhibit the interaction of α4-expressing leukocytes with their ligand(s) in the extracellular matrix and on parenchymal cells, thereby inhibiting further recruitment and inflammatory activity of activated immune cells. The specific mechanism(s) by which natalizumab products exert their effects in multiple sclerosis and Crohn’s disease have not been fully defined.
In multiple sclerosis, lesions are believed to occur when activated inflammatory cells, including T-lymphocytes, cross the blood-brain barrier (BBB). Leukocyte migration across the BBB involves interaction between adhesion molecules on inflammatory cells and their counter-receptors present on endothelial cells of the vessel wall. The clinical effect of natalizumab products in multiple sclerosis may be secondary to blockade of the molecular interaction of α4β1-integrin expressed by inflammatory cells with VCAM-1 on vascular endothelial cells, and with CS-1 and/or osteopontin expressed by parenchymal cells in the brain.
Data from an experimental autoimmune encephalitis animal model of multiple sclerosis demonstrate reduction of leukocyte migration into brain parenchyma and reduction of plaque formation detected by magnetic resonance imaging (MRI) following repeated administration of natalizumab. The clinical significance of these animal data is unknown. In Crohn’s disease, the interaction of the α4β7-integrin with the endothelial receptor MAdCAM‑1 has been implicated as an important contributor to the chronic inflammation that is a hallmark of the disease.
MAdCAM-1 is mainly expressed on gut endothelial cells and plays a critical role in the homing of T lymphocytes to gut lymph tissue found in Peyer’s patches. MAdCAM-1 expression has been found to be increased at active sites of inflammation in patients with CD, which suggests it may play a role in the recruitment of leukocytes to the mucosa and contribute to the inflammatory response characteristic of CD. The clinical effect of natalizumab products in CD may therefore be secondary to blockade of the molecular interaction of the α4β7-integrin receptor with MAdCAM-1 expressed on the venular endothelium at inflammatory foci.
VCAM-1 expression has been found to be upregulated on colonic endothelial cells in a mouse model of IBD and appears to play a role in leukocyte recruitment to sites of inflammation. The role of VCAM-1 in CD, however, is not clear.
📦 How Supplied / Storage and Handling ▾
16 HOW SUPPLIED/STORAGE AND HANDLING TYRUKO (natalizumab-sztn) injection, a sterile, preservative-free, colorless and clear to slightly opalescent solution for dilution prior to intravenous infusion, is supplied as one 300 mg/15 mL (20 mg/mL) single-dose vial per carton (NDC 61314-543-94). TYRUKO is available only through registered infusion centers participating in the TYRUKO REMS Program. To locate these infusion centers, contact Sandoz Inc. at 1-800-525-8747.
TYRUKO single-dose vials must be refrigerated between 2°C to 8°C (36°F to 46°F). Do not use beyond the expiration date stamped on the carton and vial label. DO NOT SHAKE OR FREEZE.
Protect from light. Store diluted TYRUKO solution refrigerated at 2°C to 8°C (36°F to 46°F) [see Dosage and Administration( 2.3 )].
📋 Description ▾
11 DESCRIPTION Natalizumab-sztn is a recombinant humanized IgG4ĸ monoclonal antibody produced in a Chinese hamster ovary (CHO) mammalian cell expression system. Natalizumab-sztn contains human framework regions and the complementarity-determining regions of an antibody that binds to α4-integrin. The molecular weight of natalizumab-sztn is 149 kilodaltons.
TYRUKO (natalizumab-sztn) injection is supplied as a sterile, preservative-free, colorless, and clear to slightly opalescent solution for intravenous infusion. Each 15 mL of solution contains 300 mg natalizumab-sztn; histidine (6.36 mg); L-histidine hydrochloride monohydrate (22.86 mg); polysorbate 80, USP/NF (3 mg); sodium chloride, USP (131.49 mg); and Water for Injection, USP at pH 5.7.
💬 Information for Patients ▾
17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling (Medication Guide). General Counseling Information Counsel patients to understand the risks and benefits of TYRUKO before an initial prescription is written. The patient may be educated by either the enrolled prescriber or a healthcare provider under that prescriber's direction.
INSTRUCT PATIENTS USING TYRUKO TO: • Read the Medication Guide before starting TYRUKO and before each TYRUKO infusion • Promptly report any new or continuously worsening symptoms that persist over several days to their prescriber [see Warnings and Precautions ( 5.1 )] • Inform all of their physicians that they are receiving TYRUKO • Plan to see their prescriber three months after the first infusion, six months after the first infusion, every six months thereafter, and for at least six months after discontinuing TYRUKO Progressive Multifocal Leukoencephalopathy Inform patients that Progressive Multifocal Leukoencephalopathy (PML) has occurred in patients who received natalizumab products.
Instruct the patient of the importance of contacting their doctor if they develop any symptoms suggestive of PML. Instruct the patient that typical symptoms associated with PML are diverse, progress over days to weeks, and include progressive weakness on one side of the body or clumsiness of limbs, disturbance of vision, and changes in thinking, memory, and orientation leading to confusion and personality changes. Instruct the patient that the progression of deficits usually leads to death or severe disability over weeks or months.
Instruct patients to continue to look for new signs and symptoms suggestive of PML for approximately 6 months following discontinuation of TYRUKO [see Warnings and Precautions ( 5.1 )] . TYRUKO REMS Program Advise the patient that TYRUKO is only available through a restricted program called the TYRUKO REMS Program. Inform the patient of the following requirements: Patients must read the Medication Guide and sign the Patient Enrollment Form.
Advise patients that TYRUKO is available only from certified pharmacies and infusion centers participating in the program [see Warnings and Precautions ( 5.2 )] . Herpes Infections Inform patients that TYRUKO increases the risk of developing encephalitis, and meningitis, which could be fatal, and acute retinal necrosis, which could lead to blindness, caused by the family of herpes viruses (e.g., herpes simplex and varicella zoster viruses). Instruct patients to immediately report any possible symptoms of encephalitis and meningitis (such as fever, headache, and confusion) or acute retinal necrosis (such as decreased visual acuity, eye redness, or eye pain) [see Warnings and Precautions ( 5.3 )] .
Hepatotoxicity Inform patients that TYRUKO may cause liver injury. Instruct patients treated with TYRUKO to report promptly any symptoms that may indicate liver injury, including fatigue, anorexia, right upper abdominal discomfort, dark urine, or jaundice [see Warnings and Precautions ( 5.4 )] . Hypersensitivity Reactions Instruct patients to report immediately if they experience symptoms consistent with a hypersensitivity reaction (e.g., urticaria with or without associated symptoms) during or following an infusion of TYRUKO [see Warnings and Precautions ( 5.5 )] .
Immunosuppression/Infections Inform patients that TYRUKO may lower the ability of their immune system to fight infections. Instruct the patient of the importance of contacting their doctor if they develop any symptoms of infection [see Warnings and Precautions ( 5.6 )] . Hematological Abnormalities Inform patients that TYRUKO may cause a low platelet count, which can cause severe bleeding that may be life-threatening.
Instruct patients to report any symptoms that may indicate thrombocytopenia, such as easy bruising, prolonged bleeding from cuts, petechiae, abnormally heavy menstrual periods, or bleeding from the nose or gums that is new. Advise patients that…
💬 Medication Guide ▾
Medication Guide TYRUKO ® (tie-ROO-koh) (natalizumab-sztn) injection, for intravenous use This Medication Guide has been approved by the U.S. Food and Drug Administration. Revised: 10/2025 Read this Medication Guide before you start receiving TYRUKO and before you receive each dose.
There may be new information. This Medication Guide does not take the place of talking to your doctor about your medical condition or your treatment. What is the most important information I should know about TYRUKO? • TYRUKO increases your chance (risk) of getting a rare brain infection that usually leads to death or severe disability.
This infection is called progressive multifocal leukoencephalopathy (PML). If PML happens, it usually happens in people with weakened immune systems. o There is no known treatment, prevention, or cure for PML. o Your chance of getting PML may be higher if you are also being treated with other medicines that can weaken your immune system, including other treatments for Multiple Sclerosis (MS) and Crohn’s disease (CD). You should not take certain medicines that weaken your immune system at the same time you are taking TYRUKO.
Even if you use TYRUKO alone to treat your MS or CD, you can still get PML. o Your risk of getting PML is higher if you: • have been infected by the John Cunningham Virus (JCV). JCV is a common virus that is harmless in most people but can cause PML in people who have weakened immune systems, such as people taking TYRUKO. Most people who are infected by JCV do not know it or do not have any symptoms.
This infection usually happens in childhood. Before you start receiving TYRUKO or during your treatment, your doctor may do a blood test to check if you have been infected by JCV. • have received TYRUKO for a long time, especially longer than 2 years. • have received certain medicines that can weaken your immune system before you start receiving TYRUKO. Your risk of getting PML is greatest if you have all 3 risk factors listed above.
There may be other risk factors for getting PML during TYRUKO treatment that we do not know about yet. Your doctor should discuss the risks and benefits of TYRUKO treatment with you before you decide to receive TYRUKO. See “What are the possible side effects of TYRUKO?” o While you receive TYRUKO, and for 6 months after you stop receiving TYRUKO, it is important that you call your doctor right away if you have any new or worsening medical problems that have lasted several days.
These may be new or sudden and include problems with: • thinking • eyesight • strength • balance • weakness on 1 side of your body • using your arms and legs Tell all your doctors that you are receiving TYRUKO. • Because of your risk of getting PML while you receive TYRUKO, TYRUKO is available only through a restricted distribution program called the TYRUKO REMS Program. To receive TYRUKO, you must talk to your doctor and understand the risks and benefits of TYRUKO and agree to follow all of the instructions in the TYRUKO REMS Program. o TYRUKO is only: • prescribed by doctors who are enrolled in the TYRUKO REMS Program. • given by an infusion nurse from an infusion center that is enrolled in the TYRUKO REMS Program. • given to people who are enrolled in the TYRUKO REMS Program. o Before you receive TYRUKO, your doctor will: • explain the TYRUKO REMS Program to you. • have you sign the TYRUKO REMS Patient Enrollment Form.
What is TYRUKO? TYRUKO is a prescription medicine used to treat adults with: • relapsing forms of Multiple Sclerosis (MS), to include clinically isolated syndrome, relapsing-remitting disease and active secondary progressive disease. TYRUKO increases the risk of PML.
When starting and continuing treatment with TYRUKO, it is important that you discuss with your doctor whether the expected benefit of TYRUKO is enough to outweigh this risk. See “What is the most important information I should know about TYRUKO?” • moderate to severe Crohn’s disease (CD). TYRUKO is used: o to reduce…