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BEYFORTUS 100 mg injectable solution in pre-filled syringe

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About the medicine

How to use BEYFORTUS 100 mg injectable solution in pre-filled syringe

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This page provides general information and does not replace a doctor’s consultation. Always consult a doctor before taking any medication. Seek urgent medical care if symptoms are severe.

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Introduction

Package Leaflet: Information for the User

Beyfortus 50mg solution for injection in pre-filled syringe

Beyfortus 100mg solution for injection in pre-filled syringe

nirsevimab

This medicine is subject to additional monitoring, which will allow for the quick identification of new safety information. You can help by reporting any side effects your child may experience. The last part of section 4 will tell you how to report side effects.

Read all of this leaflet carefully before giving this medicine to your child, because it contains important information for you and your child.

  • Keep this leaflet, you may need to read it again.
  • If you have any further questions, ask your doctor, pharmacist, or nurse.
  • If your child experiences any side effects, talk to your doctor, pharmacist, or nurse, even if they are not listed in this leaflet. See section 4.

Contents of the pack

  1. What is Beyfortus and what is it used for
  2. What you need to know before Beyfortus is given to your child
  3. How and when to give Beyfortus
  4. Possible side effects
  5. Storage of Beyfortus
  6. Contents of the pack and further information

1. What is Beyfortus and what is it used for

What is Beyfortus

Beyfortus is a medicine given as an injection to protect babies and children under 2 years of age against the respiratory syncytial virus(RSV). RSV is a common respiratory virus that usually causes mild symptoms similar to those of the common cold. However, especially in babies, vulnerable children, and older adults, RSV can cause serious diseases, such as bronchiolitis (inflammation of the small airways in the lung) and pneumonia (infection of the lungs) that can lead to hospitalization or even death. The virus is usually more common during the winter.

Beyfortus contains the active substance nirsevimab, which is an antibody (a protein designed to bind to a specific target) that binds to the protein that RSV needs to infect the body. By binding to this protein, Beyfortus blocks its action, thereby preventing the virus from entering and infecting human cells.

What Beyfortus is used for

Beyfortus is a medicine used to protect your child against disease caused by RSV.

Doctor consultation

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2. What you need to know before Beyfortus is given to your child

Your child should not use Beyfortus if they are allergic to nirsevimab or to any of the other ingredients of this medicine (listed in section 6).

Tell your child's doctor, pharmacist, or nurse if this applies to your child. If you are not sure, consult your child's doctor, pharmacist, or nurse before giving the medicine.

If your child shows signs of a severe allergic reaction,contact a doctor immediately.

Warnings and precautions

Consult your doctor or seek medical help immediately if you notice any signs of allergic reaction, such as:

  • difficulty breathing or swallowing
  • swelling of the face, lips, tongue, or throat
  • severe itching of the skin, with a red rash or raised bumps

Consult your healthcare professional before giving Beyfortus to your child if they have a low number of platelets in the blood (which help blood to clot), a bleeding disorder, or bruise easily, or if they are taking an anticoagulant (a medicine to prevent blood clots).

In certain chronic diseases, where too much protein is lost through the urine or intestine, for example, nephrotic syndrome and chronic liver diseases, the level of protection of Beyfortus may be reduced.

Beyfortus contains 0.1 mg of polysorbate 80 in each 50 mg dose (0.5 ml) and 0.2 mg in each 100 mg dose (1 ml). Polysorbates can cause allergic reactions. Tell your doctor if your child has any known allergy.

Children and adolescents

Do not give this medicine to children between 2 and 18 years of age because it has not been studied in this age group.

Other medicines and Beyfortus

No interactions have been observed between Beyfortus and other medicines. However, tell your doctor, pharmacist, or nurse if your child is taking, has recently taken, or might take any other medicine.

Beyfortus can be given at the same time as vaccines that are part of the national vaccination program.

3. How and when to give Beyfortus

Beyfortus should be given by a healthcare professional as an injection into the muscle. It is usually given in the outer part of the thigh.

The recommended dose is:

  • 50 mg for children who weigh less than 5 kg and 100 mg for children who weigh 5 kg or more in their first RSV season.
  • 200 mg for children who remain vulnerable to serious RSV disease in their second RSV season (given as 2 injections of 100 mg at separate sites).

Beyfortus should be given before the RSV season. The virus is usually more common during the winter (known as the RSV season). If your child is born during the winter, Beyfortus should be given after birth.

If your child is going to have heart surgery (cardiac surgery), they may be given an additional dose of Beyfortus after the surgery to ensure they have adequate protection for the rest of the RSV season.

If you have any other questions about the use of this medicine, ask your doctor, pharmacist, or nurse.

Medicine questions

Started taking the medicine and have questions?

Discuss your symptoms and treatment with a doctor online.

4. Possible side effects

Like all medicines, this medicine can cause side effects, although not everybody gets them.

Side effects may include:

Uncommon(may affect up to 1 in 100 children)

  • rash
  • reaction at the injection site (i.e., redness, swelling, and pain where the injection is given)
  • fever

Frequency not known(cannot be estimated from the available data)

  • allergic reactions

Reporting of side effects

If your child experiences any side effects, talk to your doctor, pharmacist, or nurse, even if they are not listed in this leaflet. You can also report side effects directly through the national reporting system listed in Appendix V. By reporting side effects, you can help provide more information on the safety of this medicine.

5. Storage of Beyfortus

Your doctor, pharmacist, or nurse is responsible for storing this medicine and disposing of any unused product correctly. The following information is for healthcare professionals only.

Keep this medicine out of the sight and reach of children.

Do not use this medicine after the expiry date which is stated on the carton after EXP. The expiry date is the last day of the month shown.

Store in a refrigerator (between 2°C and 8°C). After removal from the refrigerator, Beyfortus should be protected from light and used within 8 hours or discarded.

Store the pre-filled syringe in the outer carton to protect it from light.

Do not freeze, shake, or expose to direct heat.

Disposal of unused medicine and all materials that have come into contact with it should be done according to local regulations.

6. Contents of the pack and further information

What Beyfortus contains

  • The active substance is nirsevimab.
  • One pre-filled syringe of 0.5 ml solution contains 50 mg of nirsevimab.
  • One pre-filled syringe of 1 ml solution contains 100 mg of nirsevimab.
  • The other ingredients are: L-histidine, L-histidine hydrochloride, L-arginine hydrochloride, sucrose, polysorbate 80 (E433), and water for injections.

Appearance and pack size of Beyfortus

Beyfortus is a colourless to yellowish solution for injection.

Beyfortus is available in:

  • 1 or 5 pre-filled syringe(s) without needles.
  • 1 pre-filled syringe packed with 2 separate needles of different sizes.

Not all pack sizes may be marketed.

Marketing authorisation holder

Sanofi Winthrop Industrie

82 avenue Raspail

94250 Gentilly

France

Manufacturer

AstraZeneca AB

Gärtunavägen

SE‑152 57 Södertälje

Sweden

You can request more information about this medicine from the local representative of the marketing authorisation holder:

België/Belgique/Belgien

Sanofi Belgium

Tél/Tel: +32 2 710.54.00

Lietuva

Swixx Biopharma UAB

Tel: +370 5 236 91 40

Text with the name of the company Swixx Biopharma EODD and its phone number +359 2 4942 480 in a foreign language

Luxembourg/Luxemburg

Sanofi Belgium

Tél/Tel: +32 2 710.54.00

Ceská republika

Sanofi s.r.o.

Tel: +420 233 086 111

Magyarország

sanofi-aventis zrt

Tel.: +36 1 505 0055

Danmark

Sanofi A/S

Tlf: +45 4516 7000

Malta

Sanofi S.r.l.

Tel: +39 02 39394275

Deutschland

Sanofi-Aventis Deutschland GmbH

Tel.: 0800 54 54 010

Tel. from abroad: +49 69 305 21 130

Nederland

Sanofi B.V.

Tel: +31 20 245 4000

Eesti

Swixx Biopharma OÜ

Tel: +372 640 10 30

Norge

Sanofi-aventis Norge AS

Tlf: + 47 67 10 71 00

Ελλάδα

ΒΙΑΝΕΞ Α.Ε.

Τηλ: +30.210.8009111

Österreich

Sanofi-Aventis GmbH

Tel: +43 1 80 185-0

España

sanofi-aventis, S.A.

Tel: +34 93 485 94 00

Polska

Sanofi Sp. z o. o.

Tel.: +48 22 280 00 00

France

Sanofi Pasteur Europe

Tél: 0800 222 555

Appel depuis l’étranger : +33 1 57 63 67 62

Portugal

Sanofi – Produtos Farmacêuticos, Lda.

Tel: + 351 21 35 89 400

Hrvatska

Swixx Biopharma d.o.o.

Tel: +385 1 2078 500

România

Sanofi Romania SRL

Tel: +40(21) 317 31 36

Ireland

sanofi-aventis Ireland T/A SANOFI

Tel: + 353 (0) 1 4035 600

Slovenija

Swixx Biopharma d.o.o

Tel: +386 1 235 51 00

Ísland

Vistor

Sími: +354 535 7000

Slovenská republika

Swixx Biopharma s.r.o.

Tel: +421 2 208 33 600

Italia

Sanofi S.r.l.

Tel: 800536389

Suomi/Finland

Sanofi Oy

Puh/Tel: +358 (0) 201 200 300

Κύπρος

C.A. Papaellinas Ltd.

Τηλ: +357 22 741741

Sverige

Sanofi AB

Tel: +46 8-634 50 00

Latvija

Swixx Biopharma SIA

Tel: +371 6 616 47 50

United Kingdom (Northern Ireland)

sanofi-aventis Ireland Ltd. T/A SANOFI

Tel: +44 (0) 800 035 2525

Date of last revision of this leaflet:

Detailed information on this medicine is available on the European Medicines Agency website: http://www.ema.europa.eu.

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This information is intended only for healthcare professionals:

In order to improve the traceability of biological medicinal products, the name and batch number of the administered product should be clearly recorded.

Inspect Beyfortus visually for particles and discoloration before administration. Beyfortus is a transparent to opalescent, colourless to yellowish solution. Do not inject Beyfortus if the liquid is cloudy, discoloured, or contains large or foreign particles.

Do not use it if the Beyfortus pre-filled syringe has been dropped or damaged or if the security seal of the packaging is broken.

Administer the entire contents of the pre-filled syringe as an intramuscular injection, preferably in the anterolateral aspect of the thigh. The gluteal muscle should not be used routinely as an injection site due to the risk of damage to the sciatic nerve.

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Yevgen Yakovenko

General surgery 12 years exp.

Dr. Yevgen Yakovenko is a licensed surgeon and general practitioner in Spain and Germany. He specialises in general, paediatric, and oncological surgery, internal medicine, and pain management. He offers online consultations for adults and children, combining surgical precision with therapeutic support. Dr Yakovenko works with patients across different countries and provides care in Ukrainian, Russian, English, and Spanish.

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Experience and qualifications:

  • 12+ years of clinical experience in university hospitals in Germany and Spain.
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Cardiology – Diagnosis and treatment of:

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Endocrinology – Diabetes, thyroid, metabolism:
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General internal medicine and preventive care:
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Dmytro Horobets

Family medicine 7 years exp.

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Areas of expertise:

  • Endocrinology: diabetes type 1 and type 2, prediabetes, thyroid disorders, metabolic syndrome, hormonal imbalance.
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  • General surgery support: pre- and post-surgical consultations, wound care, rehabilitation.
  • Pain management: chronic and acute pain, back pain, joint pain, post-traumatic pain syndromes.
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Svetlana Kolomeeva

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Patients commonly seek her help for:

  • High blood pressure, headaches, dizziness, swelling, palpitations.
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  • Respiratory symptoms: colds, flu, sore throat, cough, fever.
  • Digestive issues: heartburn, bloating, constipation, IBS symptoms.
  • Chronic conditions: diabetes, thyroid disorders.
  • Interpretation of lab tests and medical reports, therapy adjustment.
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  • Long-term follow-up and dynamic health monitoring.

Dr Kolomeeva combines clinical expertise with personalised care. She clearly explains diagnoses, guides patients through symptoms and treatment options, and provides actionable plans. Her consultations are designed not only to address current complaints but also to stabilise chronic conditions and prevent future complications. She supports patients through every stage of care – from first symptoms to ongoing health management.

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Alexander Nazarchuk

Allergology 7 years exp.

Dr. Alexander Nazarchuk is a physician specialising in allergology and internal medicine. He provides online consultations for adults, following the principles of evidence-based medicine — no outdated treatments or unnecessary tests, with clear explanations and a personalised approach. He helps patients with a wide range of allergic and therapeutic conditions, from common day-to-day complaints to complex cases involving allergies, gastrointestinal issues, cardiovascular concerns, respiratory symptoms, and more.

You can consult Dr. Nazarchuk for:

  • Test interpretation and guidance on diagnostic plans.
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  • Abdominal pain, bloating, changes in bowel habits, nausea, heartburn.
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Marta Reguero Capilla

Allergology 8 years exp.

Dr Marta Reguero Capilla is an allergist and immunologist who works with both adults and children. She specialises in the diagnosis, treatment, and ongoing management of allergic and immune-related conditions through online consultations.

In her practice, Dr Reguero Capilla helps patients understand the causes of their symptoms, review test results, and choose appropriate treatment or monitoring strategies. Her consultations are suitable both for first-time assessments and for follow-up care over time.

Patients commonly consult Dr Marta Reguero Capilla for:

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Dr Reguero Capilla works in a structured and attentive manner, explaining medical decisions clearly and helping patients make informed choices about their own health or their child’s care.

When clinically appropriate, she may provide recommendations for further tests or referrals that patients can use within Spanish medical networks, including Sanitas and DKV, in accordance with the terms and conditions of those services.

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Frequently Asked Questions

Is a prescription required for BEYFORTUS 100 mg injectable solution in pre-filled syringe?
BEYFORTUS 100 mg injectable solution in pre-filled syringe requires a prescription in Spain. You can check with a doctor online whether this medicine may be appropriate for your situation.
What is the active substance in BEYFORTUS 100 mg injectable solution in pre-filled syringe?
The active ingredient in BEYFORTUS 100 mg injectable solution in pre-filled syringe is nirsevimab. This information helps identify medicines with the same composition but different brand names.
Who manufactures BEYFORTUS 100 mg injectable solution in pre-filled syringe?
BEYFORTUS 100 mg injectable solution in pre-filled syringe is manufactured by Sanofi Winthrop Industrie. Pharmacy brands and packaging may differ depending on the distributor.
Which doctors can assess the use of BEYFORTUS 100 mg injectable solution in pre-filled syringe online?
Doctors such as Family doctors, Psychiatrists, Dermatologists, Cardiologists, Endocrinologists, Gastroenterologists, Pulmonologists, Nephrologists, Rheumatologists, Hematologists, Infectious disease physicians, Allergists, Geriatricians, Paediatricians, Oncologists may assess whether BEYFORTUS 100 mg injectable solution in pre-filled syringe is appropriate, depending on your situation and local regulations. You can book an online consultation to discuss your symptoms and possible next steps.
What are the alternatives to BEYFORTUS 100 mg injectable solution in pre-filled syringe?
Other medicines with the same active substance (nirsevimab) include BEYFORTUS 50 mg Injectable Solution in Pre-filled Syringe, EVUSHELD 150 MG +150 MG INJECTABLE SOLUTION, KAVIGALE 300 MG INJECTABLE SOLUTION AND PERFUSION SOLUTION. These may have different brand names or formulations but contain the same therapeutic ingredient. Always consult a doctor before switching or starting a new medicine.
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