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</div><div><span>Natalizumab Injection</span></div></div><span class="page-url print-only">URL of this page: https://medlineplus.gov/druginfo/meds/a605006.html</span><!-- Article --><article><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also">Natalizumab Injection</h1><span class="alsocalled" id="d-pronunciation">pronounced as (na ta liz' you mab)
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<noscript><span class="js-disabled-message">To use the sharing features on this page, please enable JavaScript.</span></noscript></div><div id="toc-box"><ul role="navigation" class="group"><li><a href="#why">Why is this medication prescribed?</a>
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</li><li><a href="#how">How should this medicine be used?</a>
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</li><li><a href="#other-uses">Other uses for this medicine</a>
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</li><li><a href="#precautions">What special precautions should I follow?</a>
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</li><li><a href="#special-dietary">What special dietary instructions should I follow?</a>
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</li><li><a href="#if-i-forget">What should I do if I forget a dose?</a>
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</li><li><a href="#side-effects">What side effects can this medication cause?</a>
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</li><li><a href="#overdose">In case of emergency/overdose</a>
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</li><li><a href="#other-information">What other information should I know?</a>
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</li><li><a href="#brand-name-1">Brand names</a>
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</li></ul></div><section><div id="boxed-notice" class="section"><div class="section-header"><div class="section-title"><h2>Notice:</h2></div><div class="section-button"><button type="submit" aria-controls="section-notification" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-notification"><p>Natalizumab injection and natalizumab-sztn injection are biologic medications (medications made from living organisms). Biosimilar natalizumab-sztn injection is highly similar to natalizumab injection and work the same way as natalizumab injection in the body. Therefore, the term natalizumab injection products will be used to represent these medications in this discussion.</p></div></div></section><section><div id="boxed-warning" class="section"><div class="section-header"><div class="section-title"><h2>IMPORTANT WARNING: </h2></div><div class="section-button"><button type="submit" aria-controls="section-warning" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-warning"><p>Receiving natalizumab injection products may increase the risk that you will develop progressive multifocal leukoencephalopathy (PML; a rare infection of the brain that cannot be treated, prevented, or cured and that usually causes death or severe disability). The chance that you will develop PML during your treatment with natalizumab products is higher if you have one or more of the following risk factors.</p><ul><li>A blood test shows that you have been exposed to John Cunningham virus (JCV; a virus that many people are exposed to during childhood that usually causes no symptoms but may cause PML in people with weakened immune systems).</li><li>You have received many doses of natalizumab products, especially if you have received treatment for longer than 2 years.</li><li>You have ever been treated with certain medications that weaken the immune system.</li></ul><p>Your doctor will probably order a blood test before or during your treatment with a natalizumab injection product to see if you have been exposed to JCV. If the test shows that you have been exposed to JCV, you and your doctor may decide that you should not receive a natalizumab injection product, especially if you also have one or both of the other risk factors listed above. If the test does not show that you have been exposed to JCV, your doctor may repeat the test from time to time during your treatment with natalizumab injection products. You should not be tested if you have had a plasma exchange (treatment in which the liquid part of the blood is removed from the body and replaced with other fluids) during the past 2 weeks because test results will not be accurate.</p><p>There are other factors that may also increase the risk that you will develop PML. Tell your doctor if you have or have ever had PML, an organ transplant, or another condition that affects your immune system such as human immunodeficiency virus (HIV), acquired immunodeficiency syndrome (AIDS), leukemia (cancer that causes too many blood cells to be produced and released into the bloodstream), or lymphoma (cancer that develops in the cells of the immune system). Also tell your doctor if you are taking or if you have ever taken any other medications that affect the immune system. Your doctor may tell you that you should not receive natalizumab injection.</p><p>Because of the risks with this medication, natalizumab injection products are available only through a special restricted distribution program. Programs have been set up by the manufacturers of natalizumab injection products to be sure that people do not use natalizumab injection products without the necessary monitoring; these are called the TOUCH and TYRUKO REMS programs. You can only receive natalizumab injection products if you are registered with the TOUCH or TYRUKO program, if a natalizumab product is prescribed for you by a doctor who is registered with one of these programs, and if you receive the medication at an infusion center that is registered with one of these programs. Your doctor will give you more information about the program, will have you sign an enrollment form, and will answer any questions you have about the program and your treatment with natalizumab injection products.</p><p>Your doctor or nurse will give you a copy of the manufacturer's patient information sheet (Medication Guide) before you begin treatment with a natalizumab injection product and before you receive each infusion. Read this information very carefully each time you receive it and ask your doctor or nurse if you have any questions. You can also visit the Food and Drug Administration (FDA) website (<a target="_blank" href="https://www.fda.gov/Drugs/DrugSafety/ucm085729.htm">https://www.fda.gov/Drugs/DrugSafety/ucm085729.htm</a>) or the manufacturer's website to obtain the Medication Guide.</p><p>Your doctor will need to see you every 3 months at the beginning of your treatment, then every 6 months during your treatment to decide whether you should continue using natalizumab products, and then at least 6 months after treatment is stopped. You will also need to answer some questions before you receive each infusion to be sure that natalizumab products is still right for you and other questions after treatment is stopped.</p><p>Call your doctor immediately if you develop any new or worsening medical problems during your treatment, and for 6 months after your final dose. Be especially sure to call your doctor if you experience any of the following symptoms: weakness on one side of the body that worsens over time; clumsiness of the arms or legs; changes in your thinking, memory, walking, balance, eyesight, or strength that last several days; confusion; or personality changes.</p><p>If your treatment with a natalizumab injection product is stopped because you have PML, you may develop another condition called immune reconstitution inflammatory syndrome (IRIS; swelling and worsening of symptoms that may occur as the immune system begins to work again after certain medications that affect it are started or stopped), especially if you receive a treatment to remove natalizumab products from your blood more quickly. Your doctor will watch you carefully for signs of IRIS and will treat these symptoms if they occur.</p><p>Tell all the doctors who treat you that you are receiving a natalizumab injection product.</p><p>Talk to your doctor about the risks of receiving a natalizumab injection product.</p></div></div></section><section><div id="why" class="section"><div class="section-header"><div class="section-title"><h2>Why is this medication prescribed?</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><h3>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:
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</h3><ul><li>clinically isolated syndrome (CIS; first nerve symptom episode that lasts at least 24 hours),</li><li>relapsing-remitting disease (course of disease where symptoms flare up from time to time),</li><li>active secondary progressive disease (later stage of disease with continuous worsening of symptoms.)</li></ul><p>Natalizumab injection products are also used to treat and prevent episodes of symptoms in adults who have Crohn's disease (a condition in which the body attacks the lining of the digestive tract, causing pain, diarrhea, weight loss, and fever) who have not been helped by other medications or who cannot take other medications. Natalizumab is in a class of medications called monoclonal antibodies. It works by stopping certain cells of the immune system from reaching the brain and spinal cord or digestive tract and causing damage.</p></div></div></section><section><div id="how" class="section"><div class="section-header"><div class="section-title"><h2>How should this medicine be used?</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>Natalizumab injection products come as a concentrated solution (liquid) to be diluted and injected slowly into a vein by a doctor or nurse. It is usually given once every 4 weeks in a registered infusion center. It will take about 1 hour for you to receive your entire dose of a natalizumab injection product.</p><p>Natalizumab injection products may cause serious allergic reactions that are most likely to happen within 2 hours after the beginning of an infusion but may happen at any time during your treatment. You will have to stay at the infusion center for 1 hour after your infusion is finished for at least the first 12 infusions. A doctor or nurse will monitor you during this time to see if you are having a serious reaction to the medication. Tell your doctor or nurse if you experience any unusual symptoms such as hives, rash, itching, difficulty swallowing or breathing, wheezing, fever, dizziness, chest pain, flushing, nausea, or chills, especially if they occur within 2 hours after the start of your infusion.</p><p>If you are receiving a natalizumab injection product to treat Crohn's disease, your symptoms should improve during the first few months of your treatment. Tell your doctor if your symptoms have not improved after 12 weeks of treatment. Your doctor may stop treating you with natalizumab injection products.</p><p>Natalizumab injection products may help control your symptoms but will not cure your condition. Keep all appointments to receive a natalizumab injection product even if you feel well.</p></div></div></section><section><div id="other-uses" class="section"><div class="section-header"><div class="section-title"><h2>Other uses for this medicine</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>This medication may be prescribed for other uses; ask your doctor or pharmacist for more information.</p></div></div></section><section><div id="precautions" class="section"><div class="section-header"><div class="section-title"><h2>What special precautions should I follow?</h2></div><div class="section-button"><button type="submit" aria-controls="section-precautions" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-precautions"><h3>Before receiving a natalizumab injection product,</h3><ul><li>tell your doctor and pharmacist if you are allergic to natalizumab, any other medications, or any of the ingredients in natalizumab injection products. Ask your doctor or pharmacist for a list of the ingredients.</li><li>tell your doctor and pharmacist what prescription and nonprescription medications, vitamins, nutritional supplements, and herbal products you are taking. Be sure to mention the medications listed in the IMPORTANT WARNING section. Your doctor may need to change the doses of your medications or monitor you carefully for side effects.</li><li>tell your doctor if you have ever received natalizumab injection products before and if you have or have ever had any of the conditions listed in the IMPORTANT WARNING section. Before you receive each infusion of a natalizumab product, tell your doctor if you have a fever or any type of infection, including infections that last for a long time such as shingles (a rash that may occur from time to time in people who have had chickenpox in the past).</li><li>tell your doctor if you are pregnant, plan to become pregnant, or are breastfeeding. If you become pregnant while receiving a natalizumab injection product, call your doctor.</li><li>If you received a natalizumab injection product while you were pregnant and have given birth, tell your baby's doctor that you received a natalizumab injection product. Natalizumab injection products may cause your baby to have low platelet (a type of blood cell) and red blood cell counts.</li><li>do not have any vaccinations without talking to your doctor.</li></ul></div></div></section><section><div id="special-dietary" class="section"><div class="section-header"><div class="section-title"><h2>What special dietary instructions should I follow?</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Unless your doctor tells you otherwise, continue your normal diet.</p></div></div></section><section><div id="if-i-forget" class="section"><div class="section-header"><div class="section-title"><h2>What should I do if I forget a dose?</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>If you miss an appointment to receive a natalizumab infusion, call your doctor as soon as possible.</p></div></div></section><section><div id="side-effects" class="section"><div class="section-header"><div class="section-title"><h2>What side effects can this medication cause?</h2></div><div class="section-button"><button type="submit" aria-controls="section-side-effects" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-side-effects"><h3>Natalizumab injection products may cause side effects. Tell your doctor if any of these symptoms are severe or do not go away:
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</h3><ul><li>headache</li><li>extreme tiredness</li><li>drowsiness</li><li>joint pain or swelling</li><li>pain in arms or legs</li><li>back pain</li><li>swelling of the arms, hands, feet, ankles, or lower legs</li><li>muscle cramps</li><li>stomach pain</li><li>diarrhea</li><li>heartburn</li><li>constipation</li><li>gas</li><li>weight gain or loss</li><li>depression</li><li>night sweats</li><li>painful, irregular, or missed menstruation (period)</li><li>swelling, redness, burning, or itching of the vagina</li><li>white vaginal discharge</li><li>difficulty controlling urination</li><li>tooth pain</li><li>mouth sores</li><li>rash</li><li>dry skin</li><li>itching</li></ul><h3>Some side effects can be serious. If you experience any of the following symptoms or those mentioned in the HOW or IMPORTANT WARNING section, call your doctor immediately or get emergency medical treatment:
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</h3><ul><li>sore throat, fever, cough, chills, flu like symptoms, stomach cramps, diarrhea, frequent or painful urination, sudden need to urinate right away, or other signs of infection</li><li>yellowing of the skin or eyes, nausea, vomiting, extreme tiredness, loss of appetite, dark urine, right upper abdominal pain</li><li>sudden fever, severe headache, and confusion</li><li>vision changes, eye redness, or pain</li><li>unusual bleeding or bruising</li><li>small, round, red or purple-colored spots on the skin</li><li>heavy menstrual bleeding</li></ul><p>Natalizumab injection products may cause other side effects. Call your doctor if you have any unusual problems while receiving this medication.</p><p>If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration's (FDA) MedWatch Adverse Event Reporting program online (<a target="_blank" href="https://www.fda.gov/Safety/MedWatch">https://www.fda.gov/Safety/MedWatch</a>) or by phone (1-800-332-1088).</p></div></div></section><section><div id="overdose" class="section"><div class="section-header"><div class="section-title"><h2>In case of emergency/overdose</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite">
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</div></div><div class="section-body" id="section-8"><p>In case of overdose, call the poison control helpline at 1-800-222-1222. Information is also available online at <a target="_blank" href="https://www.poisonhelp.org/help">https://www.poisonhelp.org/help</a>. If the victim has collapsed, had a seizure, has trouble breathing, or can't be awakened, immediately call emergency services at 911.</p></div></div></section><section><div id="other-information" class="section"><div class="section-header"><div class="section-title"><h2>What other information should I know?</h2></div><div class="section-button"><button type="submit" aria-controls="section-9" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite">
|
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</div></div><div class="section-body" id="section-9"><p>Keep all appointments with your doctor and the laboratory. Your doctor may order certain lab tests to check your body's response to natalizumab injection products.</p><p>It is important for you to keep a written list of all of the prescription and nonprescription (over-the-counter) medicines you are taking, as well as any products such as vitamins, minerals, or other dietary supplements. You should bring this list with you each time you visit a doctor or if you are admitted to a hospital. It is also important information to carry with you in case of emergencies.</p></div></div></section><section><div id="brand-name-1" class="section"><div class="section-header"><div class="section-title"><h2>Brand names</h2></div><div class="section-button"><button type="submit" aria-controls="section-brandname-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</span></button></div><div class="sm-live-area hide-offscreen" aria-live="polite">
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||
</div></div><div class="section-body" id="section-brandname-1"><ul><li>Tyruko<sup>®</sup> (natalizumab-sztn)</li><li>Tysabri<sup>®</sup></li></ul></div></div></section><span>Last Revised - </span><span>01/15/2024</span>
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