Commonly Used Brand Name(s)Tysabri
Therapeutic ClassificationsImmune Suppressant
Pharmacologic ClassificationsMonoclonal Antibody
Natalizumab increases the risk of progressive multifocal leukoencephalopathy (PML), which may lead to death or severe disability. Risk factors for PML include therapy duration, prior immunosuppressant use, and presence of anti-JC virus antibodies. Because of the risk of PML, natalizumab is available only through a restricted program under a Risk Evaluation and Mitigation Strategy (REMS) called the TOUCH (R) Prescribing Program. Monitor patients for any new sign or symptom that may be suggestive of PML and interrupt therapy at the first sign or symptom suggestive of PML. For diagnosis, a gadolinium-enhanced MRI scan of the brain and, if indicated, cerebrospinal fluid analysis for JC viral DNA are recommended .
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Natalizumab injection is used to treat patients with relapsing forms of multiple sclerosis (MS). This medicine will not cure MS, but it may slow some of the disabling effects and decrease the number of flare-ups (relapses) of the disease.
Natalizumab injection is also used to treat moderate to severely active Crohn's disease (CD) when other medicines or treatments did not work well. This medicine will not cure CD, but may prevent it from occurring again.
This medicine is available only under a restricted distribution program called the TOUCH® Prescribing program.
A nurse or other trained health professional will give you this medicine. This medicine is given through a needle placed into one of your veins. It must be injected slowly, so the needle will have to remain in place for about an hour.
It is very important that you understand the requirements of the TOUCH® Prescribing Program, and become familiar with the medication guide. Read and follow these instructions carefully. Ask your doctor if you have any questions. Ask your pharmacist for the medication guide if you do not have one.
Your doctor may need to check your brain before you start receiving this medicine. To do this, you may need to have a Magnetic Resonance Imaging (MRI) scan.
You will need to stay at the clinic or office for 1 hour after you receive this medicine to make sure you do not have any serious side effects.
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Appropriate studies have not been performed on the relationship of age to the effects of natalizumab injection in the pediatric population. Safety and efficacy have not been established.
Appropriate studies performed to date have not demonstrated geriatric-specific problems that would limit the usefulness of natalizumab injection in the elderly.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. When you are receiving this medicine, it is especially important that your healthcare professional know if you are taking any of the medicines listed below. The following interactions have been selected on the basis of their potential significance and are not necessarily all-inclusive.
Using this medicine with any of the following medicines is usually not recommended, but may be required in some cases. If both medicines are prescribed together, your doctor may change the dose or how often you use one or both of the medicines.
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Other Medical ProblemsTOP
The presence of other medical problems may affect the use of this medicine. Make sure you tell your doctor if you have any other medical problems, especially:
- Herpes infection—Use with caution. May increase the risk for more serious infections (eg, encephalitis, meningitis, retinal necrosis).
- Liver disease—Use with caution. This medicine may make this condition worse.
- Progressive multifocal leukoencephalopathy (PML, rare brain infection) or history of—Should not be used in patients with this condition.
Your doctor will want to check your progress at 3 months and 6 months after the first injection, then every 6 months after that. Blood tests may be needed to check for unwanted effects.
Tell your doctor if you are currently taking interferon beta (Avonex®, Betaseron®, Rebif®), azathioprine (Imuran®), 6-mercaptopurine (Purinethol®), cyclosporine (Gengraf®, Neoral®, Sandimmune®), or methotrexate (Rheumatrex® Trexall®). Natalizumab should not be given together with these medicines.
This medicine may increase your risk of developing infections, including a rare and serious brain infection called progressive multifocal leukoencephalopathy (PML). Check with your doctor right away if you have vision changes, loss of coordination, clumsiness, memory loss, difficulty speaking or understanding what others say, or weak legs.
Natalizumab may cause a rare condition called immune reconstitution inflammatory syndrome (IRIS). This may occur after a person stops receiving this medicine after developing PML during treatment. Tell your doctor right away if you have an inflammatory reaction to an infection that includes mild burning, stinging, or tingling of the skin, or a feeling of heat, redness, or swelling of the skin.
Natalizumab may increase the risk of developing encephalitis, meningitis, or acute retinal necrosis caused by herpes and varicella viruses. Check with your doctor if you have a fever, headache, eye pain or redness, sensitivity of the eyes to the sun, or confusion.
Check with your doctor right away if you pain or tenderness in the upper stomach, pale stools, dark urine, loss of appetite, nausea, vomiting, or yellow eyes or skin. These could be symptoms of a serious liver problem.
This medicine may cause serious allergic reactions, including anaphylaxis. This can be life-threatening and requires immediate medical attention. Tell your doctor right away if you have a rash, itching, hoarseness, trouble breathing, trouble swallowing, or any swelling of your hands, face, or mouth after receiving this medicine.