Nirsevimab-alip (Intramuscular)

Generic name: nirsevimab-alip [ nir-SEV-i-mab-- alip ]
Brand name: Beyfortus
Drug class: Antiviral monoclonal antibodies

Medically reviewed by Drugs.com. Last updated on Feb 15, 2025.

Uses for nirsevimab-alip

Nirsevimab-alip injection is used to prevent serious lung infection in children and babies caused by respiratory syncytial virus (RSV). This medicine works by giving your body antibodies to protect it against RSV infection.

RSV infection can cause serious problems that affect the lungs, such as pneumonia and bronchitis, and in severe cases can even cause death. These problems are more likely to occur in infants and children younger than 6 months of age with chronic lung disease and breathing problems. Babies who were born premature or babies who were born with heart disease may also have problems with RSV.

The onset of RSV activity usually occurs in November and continues through April, but it may begin earlier or continue later in certain communities. A good way to help prevent RSV infection is to receive palivizumab before the start of the RSV season.

This medicine is to be given only by or under the supervision of your doctor.

Before using nirsevimab-alip

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:

Allergies

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.

Pediatric

Appropriate studies have not been performed on the relationship of age to the effects of nirsevimab-alip injection in children older than 24 months of age at the start of dosing. Safety and efficacy have not been established.

Geriatric

No information is available on the relationship of age to the effects of nirsevimab-alip injection in geriatric patients.

Breast Feeding

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.

Interactions with Medicines

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. Tell your healthcare professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.

Interactions with Food/Tobacco/Alcohol

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.

Proper use of nirsevimab-alip

A nurse or other trained health professional will give your child this medicine in a hospital. This medicine is given as a shot into one of your child's muscles, usually in the thigh.

Your child will receive this injection before or during respiratory syncytial virus (RSV) season.

This medicine comes with a patient information insert. It is very important that you read and understand this information. Ask your doctor if you have any questions.

Precautions while using nirsevimab-alip

It is very important that your doctor check your child's progress at regular visits to make sure this medicine is working properly. Blood tests may be needed to check for unwanted effects.

This medicine may cause serious allergic reactions, including anaphylaxis, which can be life-threatening and require immediate medical attention. Tell your doctor right away if your child has a rash, itching, a fast heartbeat, trouble breathing, trouble swallowing, or any swelling of your hands, face, or mouth after receiving the vaccine.

Side Effects of nirsevimab-alip

Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor or nurse immediately if any of the following side effects occur:

Incidence not known

Chest tightness
cough
difficulty swallowing
dizziness
fast heartbeat
hives, itching, skin rash
puffiness or swelling of the eyelids or around the eyes, face, lips, or tongue
unusual tiredness or weakness

Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

Rare

Bleeding, blistering, burning, coldness, discoloration of skin, feeling of pressure, hives, infection, inflammation, itching, lumps, numbness, pain, rash, redness, scarring, soreness, stinging, swelling, tenderness, tingling, ulceration, or warmth at the injection site

Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.

Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.