On July 17, 2023, the U.S. Food and Drug Administration (FDA) announced its approval of AstraZeneca’s Beyfortus™ for the prevention of Respiratory Syncytial Virus (RSV) infection in babies and toddlers. RSV is a common respiratory virus that may cause mild, cold-like symptoms in many people. Infants and older adults are at an increased risk of severe RSV infection that may lead to lower respiratory tract diseases, such as pneumonia or bronchiolitis and hospitalization. Approximately 1-3% of children under the age of one are hospitalized due to RSV annually. Rates of RSV infections begin to rise in early autumn and peak in the winter. The upcoming RSV season will be the first in the United States with preventative pharmaceuticals available for high-risk groups of infants, toddlers and older adults. In May 2023, the FDA approved two RSV vaccines, Arexvy® and Abrysvo®, for adults 60 and older. Now, the approval of Beyfortus™ addresses the need for prevention in infants. It is indicated for neonates and infants born during or entering their first RSV season and children up to 2 years old who may still be at risk of severe RSV infection entering their second RSV season. The Centers for Disease Control and Prevention (CDC) recommends Beyfortus™ for all infants younger than 8 months of age. Beyfortus™ is not a vaccine; it is a monoclonal antibody product administered as a single intramuscular injection. Vaccines usually administer a virus or virus-like product into a patient, prompting their immune system to make antibodies to protect against that virus. In contrast, patients receiving Beyfortus™ will acquire an antibody already prepared to bind to and block the RSV virus. The safety and efficacy of Beyfortus™ was demonstrated in 3 clinical trials of children up to 2 years old. Participants receiving Beyfortus™ showed a decrease in all health care provider visits by up to 75% compared to those receiving placebo. These health care provider visits included all physician, urgent care and emergency room visits and hospitalizations related to worsening symptoms and a positive RSV test. Possible side effects of Beyfortus™ include rash and injection site reactions. Caution should be used in patients with significant bleeding disorders or a history of serious allergic reactions to monoclonal antibodies.