Amivantamab-vmjw: lung cancer use, infusion schedule, side effects
Last updated September 7, 2026.
**Amivantamab-vmjw is a targeted cancer medicine given as an intravenous infusion, and it belongs to a class called bispecific antibodies.** It attaches to two proteins on lung cancer cells, EGFR and MET, which blocks the growth signals those proteins send and flags the cells for your immune system to attack. It is given in a clinic or infusion center by a cancer care team, never at home. The most important safety point is that infusion-related reactions are common, especially with the first dose, so your team splits that first dose over two days, gives premedications, and watches you closely during and after each infusion.
What does it treat?
Amivantamab-vmjw treats non-small cell lung cancer that has spread and that carries specific changes in the EGFR gene, confirmed by an FDA-approved test on tumor tissue or blood. One approved use is first-line treatment of tumors with EGFR exon 20 insertion mutations, given together with carboplatin and pemetrexed chemotherapy, and it is also used alone for exon 20 insertion disease that has progressed after platinum chemotherapy. It is also approved with lazertinib (Lazcluze) tablets as first-line treatment for tumors with EGFR exon 19 deletions or exon 21 L858R substitutions, and with carboplatin and pemetrexed for that same group after disease worsens on osimertinib. In practice, people starting it have a tissue or liquid biopsy result in hand and symptoms such as cough, shortness of breath, chest pain, or weight loss from advanced disease. It is not used for lung cancers without these EGFR changes, and it is not a pill you pick up at a pharmacy.
How do you take it?
Amivantamab-vmjw comes as a single-dose vial that a pharmacist dilutes into an IV bag, and dosing is based on your body weight at the start of treatment. For treatment alone or with lazertinib, the usual adult dose is 1050 mg if you weigh less than 80 kg (about 176 pounds) and 1400 mg if you weigh 80 kg or more, given weekly for the first four weeks and then every two weeks starting at week five. When it is given with carboplatin and pemetrexed, the doses are higher, 1400 mg for weights under 80 kg and 1750 mg for 80 kg and above, weekly for four weeks and then every three weeks. The first dose is always split across two days, with a smaller amount on day one and the rest on day two, to lower the chance of a reaction. There is no daily ceiling to track at home because your team controls each dose, and there are no food rules for the infusion itself. Before each infusion you get an antihistamine, a fever reducer, and, for the first doses, a steroid, so plan for a long clinic day and someone to drive you. If you miss an appointment, call your oncology team to reschedule as soon as possible rather than doubling up, since a long gap may mean restarting the split first dose. Call your team before the next infusion if you develop new or worsening shortness of breath, cough, or fever, a spreading rash, painful nail changes, eye pain or vision changes, or leg swelling.
Side effects to know
- Common: Most people get a rash or acne-like skin eruption, sore skin around the fingernails and toenails, dry skin, mouth sores, tiredness, nausea, constipation or diarrhea, swelling in the face or legs, and low magnesium or albumin on blood tests, and fever, chills, flushing, or shortness of breath during an infusion are common with the first dose.
- Serious: Get help right away for chest tightness, trouble breathing, throat swelling, dizziness, or a drop in blood pressure during or shortly after an infusion, and for new or worsening cough, breathlessness, or fever, which can signal interstitial lung disease or pneumonitis. Also stop and call your team for blistering or peeling skin or sores in the mouth or eyes, eye pain, redness, or blurred vision, and for leg swelling, calf pain, or sudden breathlessness that could be a blood clot, which is more likely when the drug is combined with lazertinib.
Who should not take it?
Tell your care team if you have a history of lung disease such as pulmonary fibrosis, pneumonitis, or radiation lung injury, since amivantamab-vmjw is permanently stopped if interstitial lung disease is confirmed. Mention prior blood clots, recent surgery, or any use of blood thinners, because when this drug is given with lazertinib your team will usually start a preventive anticoagulant for the first four months. Eye conditions, contact lens use, and a history of severe skin reactions also change monitoring, and you should avoid sun exposure, use broad-spectrum sunscreen and protective clothing, and use alcohol-free emollients and antibiotic skin creams as directed, since sunlight makes the rash worse. There are no known drug interactions that require dose changes, but list every prescription, over-the-counter product, and supplement anyway, especially anything that affects clotting or your immune system. This drug can harm an unborn baby, so if you can become pregnant you need a pregnancy test before starting, effective birth control during treatment, and continued birth control for three months after the last dose, and you should not breastfeed during treatment or for three months after. Alcohol does not interact directly with the infusion, but it dries the skin, worsens nausea and dehydration during chemotherapy combinations, and is worth limiting or skipping on treatment weeks.
When is it an emergency?
Call 911 if you collapse, cannot catch your breath, have chest pain, have swelling of the lips, tongue, or throat, or develop hives with lightheadedness, since these point to a severe infusion or allergic reaction. Go to an emergency room the same day for a fever of 100.4 F or higher with chills while on chemotherapy combinations, for rapidly worsening cough or breathlessness that could be pneumonitis, for skin that blisters or peels or sores that involve the eyes, mouth, or genitals, and for sudden calf swelling and pain or one-sided leg swelling, which can mean a clot. Sudden eye pain, light sensitivity, or vision loss needs urgent eye evaluation, not a wait-and-see approach. Overdose is unlikely because a nurse controls the infusion rate, but if too much is given or a product is accidentally swallowed or injected outside a clinic, call Poison Control at 1-800-222-1222 and contact your oncology team, and call 911 for collapse or breathing trouble.
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Common questions
What is the maximum dose of amivantamab-vmjw I can get?
There is no dose you manage yourself, because a nurse gives every dose through an IV. The dose is set by your weight at the start of treatment and by the regimen you are on. Alone or with lazertinib, it is 1050 mg if you weigh under 80 kg and 1400 mg at 80 kg or more. With carboplatin and pemetrexed, it is 1400 mg under 80 kg and 1750 mg at 80 kg or more. Your first dose is always split over two days, and your team lowers or holds doses if you have serious side effects.
Can I drink alcohol while on amivantamab-vmjw?
Alcohol does not interact directly with amivantamab-vmjw, and the label does not ban it. It does work against you in other ways during treatment. It dries out skin that is already prone to rash and cracking, and it adds to nausea, mouth sores, and dehydration when you are also getting carboplatin and pemetrexed. If you are taking lazertinib or a blood thinner alongside the infusion, heavy drinking raises bleeding and liver risks. A drink now and then between cycles is usually reasonable, so ask your oncology team about your specific regimen.
Is amivantamab-vmjw safe during pregnancy or breastfeeding?
No. Based on how it works, amivantamab-vmjw can cause fetal harm, so it is not used during pregnancy. If you can become pregnant, your team confirms you are not pregnant before the first dose and asks you to use effective birth control during treatment and for three months after the last dose. Do not breastfeed during treatment or for three months after the final dose. Tell your team right away if you become pregnant while on treatment so the plan can be changed.
Do I need to eat before my infusion, and are there food rules?
There are no food restrictions for the infusion itself, and lazertinib tablets can be taken with or without food. Eat a normal meal before you come in, since infusion days run long, especially the split first dose. Drink water before and after your appointment, because nausea and low appetite from chemotherapy combinations can leave you dry. If mouth sores make eating painful, ask about a mouth rinse and choose soft, bland foods. Skipping food entirely tends to make infusion-day nausea and lightheadedness worse.
What are the signs of a bad infusion reaction?
Infusion-related reactions usually happen during the first infusion, most often within the first hour or two. Watch for chills, shaking, fever, flushing, chest discomfort, nausea, shortness of breath, and lightheadedness. Tell the nurse the moment any of these start, because the standard response is to stop or slow the infusion and treat the symptoms. Most people can restart at a slower rate the same day. If the reaction is severe, with throat swelling, wheezing, or a drop in blood pressure, treatment is stopped permanently and emergency care starts.
What should I do about the rash and the sore skin around my nails?
Skin and nail effects are the most common ongoing problem with this drug, and they respond best to early treatment. From day one, use a thick alcohol-free moisturizer, wear broad-spectrum sunscreen and protective clothing, and stay out of direct sun, since sunlight makes the rash worse. Your team may prescribe a topical or oral antibiotic and a steroid cream to be used preventively rather than only after a flare. For sore nail folds, soak in white vinegar solution as directed, keep nails short, and avoid tight shoes and manicures. Call your team if the rash spreads, oozes, or blisters, or if a nail area becomes hot and swollen.