Your first 90 days
Your first 90 days on Imaavy for generalized myasthenia gravis
What happens before the first fill, the days that matter, the label's rules and who to call, from the label, the drugmaker's own program and one insurer's written rules.
Imaavy is a steady schedule of IV infusions rather than a pill or a cycle with breaks. After a larger first dose, a smaller dose follows every 2 weeks for as long as your neurologist keeps you on it. The first 90 days hold 7 infusions if none is moved. This page lays out that stretch from the FDA label, Johnson & Johnson's IMAAVY withMe program and one insurer's written rules.
What has to happen before the first bottle ships
Imaavy has no REMS, so the first infusion waits on vaccines, an insurance approval and a place to receive it. These are the 6 things in the way, in order.
Vaccines come first
The label asks you to complete age-appropriate vaccines before starting Imaavy.
- Live vaccines are not recommended during treatment because Imaavy lowers IgG antibodies.
- Tell any provider giving you a shot later that you receive Imaavy.FDA label
Your infection history
The Patient Information asks you to tell your provider about recent infections and about any history of shingles or mono.
- The label says Imaavy may raise the chance of an old virus, such as shingles, becoming active again.FDA label
Where each infusion will happen
Johnson & Johnson lists your doctor's office, an infusion clinic or your home as possible places.
- It says to expect about an hour or longer at the treatment site for each visit.IMAAVY withMe
The enrollment form and benefits check
Your neurologist's office faxes an IMAAVY withMe enrollment form with your weight and the dose.
- The program then checks your insurance benefits and sends the prescription to a pharmacy that ships to the infusion site.Enrollment form
The insurance approval
Plans usually ask for prior authorization before the first infusion.
- If commercial coverage is denied, or delayed more than 5 business days after the request, Imaavy may come free through the IMAAVY withMe Access Program.Access Program terms
Your Nurse Navigator
After you sign up, a registered nurse calls within 1 to 2 business days, with caller ID showing Navigator withMe.
- The nurse helps with costs, finding an infusion site and preparing for infusions, but does not give medical advice.IMAAVY withMe
The days that matter
Counted from the first infusion, with the starting dose, the switch to maintenance on day 15 and each infusion 2 weeks apart. Type your first-dose date and the tiles become real dates you can add to your calendar.
The tiles below count days from a first dose. Enter the date of yours, or the date you expect, and each tile becomes a real date on your calendar.
The date stays on your device. It is not sent to Trial Friend or anyone else. The calendar file works with Apple, Google and Outlook calendars.Enrollment and the benefits check
The office sends the IMAAVY withMe enrollment form, and a Case Manager checks your coverage.
- No source sets how long this takes, because each insurer works on its own timeline.
Approval, then booking the infusion
Once the plan approves, the infusion can be booked.
- Your Nurse Navigator can help you find an infusion site and prepare for the first visit.
First infusion, the 30mg/kg starting dose
The starting dose runs over at least 30 minutes, then staff watch you for 30 minutes more.
- Johnson & Johnson suggests having a caregiver drive or travel with you.
The window for infusion reactions
In the main trial, infusion reactions such as headache, nausea or chills came within an hour to 2 days of a dose.
- Tell your provider right away if they happen.
First maintenance infusion, 15mg/kg
Two weeks after the first dose, the dose drops to 15mg/kg, given over at least 15 minutes.
- Allergic reactions in the trial came anywhere from 1 hour to 2 weeks after a dose.
Maintenance infusion 2
Same dose, every 2 weeks.
- In the main trial, rises in cholesterol on Imaavy peaked around week 4, then eased and leveled off by week 24.
Maintenance infusion 3
If you cannot make an infusion, Johnson & Johnson asks you to call your healthcare provider right away.
- It says not to reschedule until you have spoken with them.
Maintenance infusion 4
The prescription on the enrollment form lists refills and the infusion site Imaavy ships to, which cannot be a PO box.
- The form also records your weight, which sets the dose.
Maintenance infusion 5
Tell the office before any infusion if you have a fever, cough or burning when you urinate.
- The label says a dose waits until an active infection is gone.
Maintenance infusion 6
This is the seventh infusion counted from day 1.
- The main trial measured its result at weeks 22 to 24, well past this point.
The label, revision by revision
The FDA lists which sections changed in each revision of a label. These are the revisions the current Imaavy label records, dated by the FDA, with a plain note on what each one meant for a patient. Older references and handouts can lag these by months.
Current label dated August 21, 2026, read from the FDA's label database today. FDA label
- August 2026
The FDA added warm autoimmune hemolytic anemia as a second use, with its own dose of 30mg/kg every 4 weeks. The warnings gained data from that trial, and the missed-dose wording was rewritten. The myasthenia gravis dose did not change.FDA letter
- April 2025
The FDA approved Imaavy for generalized myasthenia gravis in people 12 and older with AChR or MuSK antibodies. The first label already carried the vaccine, infection and 30-minute monitoring rules.FDA letter
How the label says to take it
The parts of the prescribing information and the patient leaflet that come up in the first 3 months, in plain words.
- A starting dose, then every 2 weeks
The label gives 30mg/kg once, then 15mg/kg two weeks later and every 2 weeks after that.
- There are no planned breaks between doses in the label.FDA label
- How the dose is set
The label sets each dose by your current body weight, so the number of vials can change if your weight changes.
- Vials come in 300mg and 1,200mg sizes, one vial per carton.FDA label
- How the infusion is given
Imaavy is diluted in salt water and given through a vein with a filter on the line.
- People 12 and older who weigh less than 40kg (about 88 lb) get a smaller bag, 100mL instead of 250mL.FDA label
- Watching after each infusion
Your provider watches you during the infusion and for 30 minutes after it.
- If a reaction happens, they may slow the infusion, give medicine before it, or stop it if the reaction is severe.FDA label
- If an infusion is missed
The label says to give the missed dose as soon as possible, then resume dosing while keeping the treatment interval.
- Your neurologist's office sets the new date.FDA label
- Other antibody medicines
Imaavy can lower the levels of medicines that use the same FcRn receptor, such as immunoglobulin (IVIG) and some monoclonal antibodies.
- The label asks doctors to watch for weaker effect and, if long-term use of both is essential, to consider stopping Imaavy.FDA label
- Pregnancy
Human data are limited.
- In pregnant monkeys, Imaavy harmed the placenta and was linked to fetal loss at both doses tested.
- A baby exposed in the womb may have less protection from infection for 6 months or more.
- A pregnancy safety study takes reports at 1-800-526-7736.FDA label
- Breastfeeding
Imaavy passes into breast milk, based on a small study of 13 women.
- It is not known whether it harms a breastfed baby, so the label asks you and your provider to weigh feeding choices together.FDA label
What the label says to act on
The symptoms the label singles out, and what it tells patients and prescribers to do about each. If any of these happen, the label's instruction is the one to follow, with your care team.
Signs of an allergic reaction
Swelling of the face, lips, mouth, tongue or throat, trouble swallowing or breathing, hives, an itchy rash, or chest pain or tightness.
- The Patient Information says to tell your provider and get emergency help right away.
- Reactions can come during an infusion or up to a few weeks later.FDA label
Signs of infection
Fever, chills, shivering, cough, sore throat, fever blisters, burning when you urinate, or trouble breathing.
- The Patient Information says to tell your provider right away.
- In the main trial, respiratory infections occurred in 18% on Imaavy against 13% on placebo.FDA label
Shingles and other old viruses
Herpes infections such as shingles or cold sores occurred in 6% on Imaavy against 2% on placebo.
- In the extension study, 2 patients had serious Epstein-Barr virus illness, and one died of complications.FDA label
Infusion reactions
Headache, rash, nausea, tiredness, dizziness, chills, flu-like symptoms or skin redness, during or within a few days of an infusion.
- Tell your provider right away.
- In the trials these reactions were mild to moderate.FDA label
Swelling and muscle spasms
Swelling in the hands, ankles or feet occurred in 12% on Imaavy against 2% on placebo.
- Muscle spasms occurred in 12% against 3%.
- The label lists both, with respiratory infections, as the most common side effects in myasthenia gravis.FDA label
Why the pharmacy or the insurer says no, and what fixes it
Most first-fill delays are one of these. Knowing which one tells you who to call.
- Prior authorization pending or deniedThe FEP policy below asks for an AChR or MuSK antibody result, a symptom score and one earlier treatment that did not work. The neurologist's records usually answer what the plan is asking for.FEP Blue policy
- Commercial coverage delayed or deniedThe IMAAVY withMe Access Program may supply Imaavy at no cost for up to 3 years, or until the plan covers it. The prescriber must send a letter of medical necessity within 30 days of your first infusion.Access Program terms
- Denied because the form was incompleteThe Access Program does not cover a denial caused by missing information on the prior authorization or coverage form. Its terms list this as an exclusion, so a complete request matters.Access Program terms
- A copay you cannot payCommercial insurance: the IMAAVY withMe Savings Program, as little as $0 per infusion, with a yearly maximum. Medicare, Medicaid, TRICARE, VA and other government coverage are excluded. Our help paying page lists charity funds that may cover what remains.Savings Program terms
- Your plan uses SaveOnSPThe Savings Program terms exclude patients whose plan partners with SaveOnSP, and may cut the maximum for other accumulator or maximizer plans. Call 844-494-8463 to talk through your options.Savings Program terms
- You live in Massachusetts, Minnesota or Rhode IslandThe Savings Program's help with infusion administration and monitoring costs is not valid in these 3 states. Its help with the medicine itself still applies, so the clinic fee may fall on you.Savings Program terms
- No insurance, or coverage that falls shortThe Johnson & Johnson Patient Assistance Program may provide Imaavy at no cost for up to 1 year if you meet its income rules. Call 844-494-8463 or see PatientAssistanceInfo.com/IMM.J&J withMe cost page
Blue Cross Blue Shield Federal Employee Program prior authorization policy, July 1, 2026
- Age 12 or older, with generalized myasthenia gravis
- AChR or MuSK antibodies present
- Myasthenia Gravis Foundation of America class II to IV
- A baseline MG-ADL score of 6 or more, or a QMG score above 9
- An acetylcholinesterase inhibitor, azathioprine, cyclosporine, mycophenolate mofetil, tacrolimus, methotrexate or cyclophosphamide did not work well enough, was not tolerated or could not be used (one of these)
- Not given at the same time as live or live-attenuated vaccines
Approval length. Six months at first, then 12 months at a time if MG-ADL or QMG fell by 2 points or more, with no unacceptable side effects.
This policy was approved on June 11, 2026, before the label added warm autoimmune hemolytic anemia in August 2026. It cites the April 2025 label, but the gMG dose and antibody rule have not changed since then. Its September 2025 review dropped a requirement to have tried 2 immunosuppressants first. It is here as an example of what a plan asks for, not as a rule. FEP Blue policy
Who to call, and what they can do
The drugmaker's program handles most of the first-fill problems above. Charity funds and foundation help are on the help paying page.
- A dedicated Nurse Navigator, a registered nurse who calls within 1 to 2 business days of sign-up, with support in more than 100 languages. The enrollment form offers this to patients 18 and older and to caregivers of younger patients
- The IMAAVY withMe Savings Program for commercial insurance, as little as $0 per infusion, with a yearly maximum and a separate $7,000 yearly cap on administration and monitoring costs
- Savings help is not open to Medicare, Medicaid, TRICARE, Department of Defense or VA patients, under the program's terms
- The IMAAVY withMe Access Program, Imaavy at no cost for up to 3 years when commercial coverage is delayed more than 5 business days or denied
- The Johnson & Johnson Patient Assistance Program, no-cost medicine for up to 1 year for people who meet its income rules
- A Welcome Kit for infusion days, a Patient Portal and an Infusion Center Finder. Savings and Case Manager questions go to 844-494-8463, Monday to Friday, 8 AM to 8 PM Eastern
Details as the drugmaker publishes them. IMAAVY withMe
Five questions for the pharmacist or the support line
- Which pharmacy is shipping my Imaavy, and does it go to my doctor's office or the infusion center?
- Is my dose based on my current weight, and who do I tell if my weight changes?
- If I miss an infusion, who reschedules it and how soon can it be given?
- I take IVIG or another antibody medicine. Does my neurologist need to know before my next infusion?
- Has my Savings Program been applied to both the medicine and the infusion fee?
- Which vaccines should I finish before my first infusion, and which ones should I avoid during treatment?
Questions people ask in the first weeks
How long does it take to start Imaavy after it is prescribed?
There is no fixed number of days. Vaccines, the benefits check, prior authorization and booking an infusion site each take their own time. If commercial coverage is delayed more than 5 business days after the request, the IMAAVY withMe Access Program may supply the medicine at no cost.
How often is Imaavy given for myasthenia gravis?
Every 2 weeks, after a larger first dose. The label gives 30mg/kg once, then 15mg/kg starting 2 weeks later. Unlike some other FcRn blockers, the label does not use treatment cycles with breaks. Johnson & Johnson says your doctor decides how many infusions you need.
Can I give Imaavy to myself at home?
No, the current label covers only IV infusion by a healthcare provider. If an office or clinic does not suit you, Johnson & Johnson says a Nurse Navigator may help arrange home treatment.
Do I need vaccines before starting Imaavy?
The label asks you to complete age-appropriate vaccines before the first infusion. Live vaccines are not recommended during treatment, and you should tell any provider giving a vaccine that you receive Imaavy.
Do I need blood tests on Imaavy?
The label sets no scheduled blood test. It does report that cholesterol rose in some trial patients, peaking around week 4. Your neurologist decides whether to check it.
Is Imaavy approved if I do not have AChR antibodies?
The label covers people with AChR or MuSK antibodies. It does not cover people who test negative for both, often called seronegative. The FEP policy shown here also asks for one of these antibody results.
Can teenagers receive Imaavy?
Yes, the label covers people 12 and older with AChR or MuSK antibodies. A 24-week study in 7 patients aged 12 to 16 found side effects similar to those in adults.
Is Imaavy used the same way for warm autoimmune hemolytic anemia?
No, for that blood condition the label gives 30mg/kg every 4 weeks. This page covers only generalized myasthenia gravis, where the maintenance dose is 15mg/kg every 2 weeks.
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Sources
- IMAAVY (nipocalimab-aahu) injection, for intravenous use, prescribing information and Patient Information, revised August 2026, Janssen Biotech, via DailyMed, August 21, 2026.
- IMAAVY (nipocalimab-aahu) injection, for intravenous use, prescribing information, revised 4/2025, FDA, Drugs@FDA, April 30, 2025.
- IMAAVY™ Costs & Savings Support | IMAAVY (nipocalimab-aahu), Johnson & Johnson, November 7, 2026.
- IMAAVY withMe - Commercial or Private Insurance | J&J withMe, Johnson & Johnson, October 7, 2026.
- IMAAVY withMe Savings Program for eligible patients using commercial insurance, with Savings Program Requirements, Johnson & Johnson, November 21, 2025.
- IMAAVY withMe Access Program, Program Description and Program Requirements, Johnson & Johnson, April 1, 2025.
- IMAAVY withMe Patient Enrollment Form (UPDATE 08.26), Johnson & Johnson, August 25, 2026.
- Access & Support for Your Patients | IMAAVY™ (nipocalimab-aahu), Johnson & Johnson, November 7, 2026.
- Pharmacy Policy 5.85.066, Imaavy (nipocalimab-aahu), Blue Cross Blue Shield Federal Employee Program, July 1, 2026.
- BLA 761430/S-002 supplement approval letter, warm autoimmune hemolytic anemia, FDA, August 24, 2026.
- BLA 761430 approval letter, Imaavy (nipocalimab-aahu) for generalized myasthenia gravis, FDA, April 29, 2025.
This page explains what the FDA label, the drugmaker's support program and an insurer policy say. It is not medical advice and does not tell anyone to start, stop or change a medicine. Dosing, test timing and restarts after a gap are decisions for the prescribing neurologist. Found an error? Use the report link in the footer and it will be checked against the source.