Active substance

Results for the substance clesrovimab

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About this active substance

Clesrovimab is a monoclonal antibody used to help prevent lower respiratory tract disease caused by respiratory syncytial virus (RSV) in newborns and infants during their first RSV season. It is not a vaccine and it does not treat an RSV infection that has already started; it provides ready-made antibodies for rapid passive protection.

The medicine attaches to the RSV F protein, which the virus needs to enter human cells. By blocking this step, clesrovimab can lower the risk of bronchiolitis, pneumonia, breathing difficulty, medical visits and hospitalisation related to RSV. It is most relevant during the RSV season, usually autumn to spring, and should be used according to local medical recommendations.

Clesrovimab is given by a healthcare professional as a single intramuscular injection, usually into the thigh. It may be given from birth to babies born during the RSV season or before their first RSV season begins. Parents should tell the doctor if the baby has ever had a severe allergy to medicines, injections or any ingredient in the product.

The most likely side effects are redness, swelling or discomfort where the injection was given, and skin rash. Serious allergic reactions are rare but possible. Get urgent medical help if the baby develops trouble breathing, swelling of the face, lips or tongue, blue lips, unusual sleepiness, very poor feeding, dehydration signs or fever with a clearly worsened general condition.