Tysabri is one of the most effective infusion therapies available for relapsing multiple sclerosis and for Crohn’s disease that has not responded to other treatments. It also comes with safety steps that are more involved than most infusions, which can feel intimidating at first. This guide explains how Tysabri works, what the monthly visit looks like, and why the extra monitoring is there to protect you.
| Prescribed Tysabri? Our certified infusion team handles TOUCH coordination, benefits, and scheduling. Call River’s Edge. |
What Is Tysabri and How Does It Work?
Tysabri is the brand name for natalizumab, a biologic given by IV infusion. It belongs to a class of drugs called integrin receptor antagonists. In simple terms, it blocks a protein on the surface of immune cells that those cells use to cross out of the bloodstream. By blocking that doorway, Tysabri keeps inflammatory immune cells from reaching the brain and spinal cord in MS, and from reaching the lining of the intestine in Crohn’s disease.
It is approved for relapsing forms of MS in adults and for moderate-to-severe Crohn’s disease in adults who have not responded well to, or cannot take, other therapies. Many patients see fewer relapses or flares and report meaningful improvement in day-to-day function.
| KEY TAKEAWAY Tysabri is highly effective, and it requires a structured safety program. Both of those facts are true at the same time, and understanding the second one is what lets you benefit from the first. |
Your Tysabri Dosing Schedule
The standard dose is 300 mg by IV infusion every four weeks. The infusion itself takes about one hour. Because the medication reaches a steady level in your body over several weeks of regular dosing, staying consistent with your monthly appointments matters.
| Element | Detail |
|---|---|
| Dose | 300 mg, intravenous |
| Frequency | Every 4 weeks (some MS patients use extended interval dosing) |
| Infusion time | About 1 hour |
| Observation after | About 1 hour, especially during your first several infusions |
For some people with MS, neurologists use extended interval dosing, spacing infusions to roughly every six weeks instead of four. This approach is being studied as a way to lower the risk of a rare but serious brain infection discussed below. Whether it is appropriate for you is a decision for your neurologist.
The TOUCH Program and JC Virus Testing
Tysabri is only available through a special safety program called the TOUCH Prescribing Program. There are two arms: one for MS patients and one for Crohn’s patients. Your prescriber must be enrolled, and the pharmacy and infusion center must be specially certified to dispense and administer the medication. This is not a hurdle for you to clear so much as a system designed to keep close track of safety.
A central part of that safety system is testing for the JC virus. This is a common virus that is usually harmless, but in people taking Tysabri it is linked to the risk of a serious brain infection. Your care team will check your JC virus antibody status before starting and periodically during treatment to help weigh your individual risk.
| IMPORTANT Tysabri carries a boxed warning, the FDA’s most serious warning, for a rare brain infection called progressive multifocal leukoencephalopathy (PML). Risk is influenced by your JC virus status, how long you have been on treatment, and prior use of certain immune-suppressing medications. Your care team monitors for this throughout treatment. |
Symptoms to Report Right Away
Because of the PML risk, it is important to know the warning signs and to report anything new or unusual promptly. These can develop gradually over days to weeks and may include:
- New or worsening weakness on one side of the body
- Changes in vision
- Problems with speech or finding words
- Confusion, personality changes, or difficulty thinking clearly
- Loss of coordination or balance
If you notice symptoms like these, contact your neurologist right away. Catching a problem early gives your care team the best chance to act.
| Our team coordinates your JC virus testing reminders and keeps your monthly schedule on track. Learn more about our MS and IBD infusion program. |
What Infusion Day Looks Like
Compared with some infusions, a Tysabri visit is relatively short. After check-in, a nurse places an IV line and starts the medication, which runs over about an hour. You will then be observed for around another hour, which is especially standard during your first several infusions, to watch for any reaction.
Infusion reactions are possible and may include flushing, dizziness, nausea, rash, or chills. Patients who develop antibodies against the medication are more likely to have reactions, which is one more reason the program tracks your response over time. Bring something to keep you comfortable, wear easy-access sleeves, and plan your day so you are not rushed afterward.
| PRO TIP Schedule your monthly infusion for the same week each cycle if you can. A steady rhythm makes it easier to remember, easier to arrange a ride if you want one, and easier for your care team to keep your dosing on time. |
Where Can You Get Tysabri?
Because the medication requires a certified pharmacy and infusion site, where you receive Tysabri matters. A specialty pharmacy with the right certification and a dedicated neurology and IBD program can manage the moving parts: TOUCH coordination, prior authorization, benefits verification, JC virus testing reminders, and consistent monthly scheduling.
At River’s Edge, our certified team handles that coordination so your treatment stays both safe and on schedule. You get the clinical attention these therapies require, in a comfortable setting close to home.
| Start Tysabri with a certified, attentive infusion team. Contact River’s Edge Specialty Pharmacy today. |
Frequently Asked Questions
How long does a Tysabri infusion take?
The infusion itself runs about one hour, followed by roughly an hour of observation, especially during your first several treatments. Plan for additional time for check-in and IV placement.
How often do I get Tysabri?
The standard schedule is one infusion every four weeks. Some MS patients use extended interval dosing of about every six weeks, but only when a neurologist determines it is appropriate.
What is the TOUCH program?
TOUCH is a required safety program for Tysabri. Your prescriber must be enrolled, and the pharmacy and infusion center must be certified. It exists to monitor for serious risks, including PML, throughout your treatment.
Why do I need a JC virus test?
The JC virus is linked to the risk of PML, a rare but serious brain infection, in people on Tysabri. Testing your antibody status before and during treatment helps your care team understand and manage your individual risk.
Will insurance cover Tysabri?
Tysabri is a high-cost specialty medication and typically requires prior authorization. A specialty pharmacy can verify your benefits, manage the authorization, and connect you with assistance programs if needed.