Cosentyx is a medication used to treat various inflammatory conditions such as psoriasis, psoriatic arthritis, and ankylosing spondylitis [1]. While Cosentyx is generally well-tolerated, some individuals may experience an allergic reaction to the medication.

According to the Cosentyx website, signs of an allergic reaction to the medication may include hives, difficulty breathing, swelling of the face, lips, tongue, or throat [2]. If an individual experiences any of these symptoms, they should seek medical attention immediately.

A study published in the Journal of Clinical and Aesthetic Dermatology outlines a case report of a patient who experienced an allergic reaction to Cosentyx [3]. The patient presented with an itchy rash on their arms and legs, as well as a fever and chills. Blood tests showed elevated levels of eosinophils, a type of white blood cell that can be indicative of an allergic reaction. The patient was diagnosed with a hypersensitivity reaction to Cosentyx and was advised to discontinue the medication.

In summary, an allergic reaction to Cosentyx may be diagnosed based on symptoms such as hives, difficulty breathing, and swelling of the face, lips, tongue, or throat. Blood tests may also be used to assess the presence of eosinophils, which can be elevated in the case of an allergic reaction. If an individual experiences any of these symptoms, they should seek medical attention immediately [2][3].

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.cosentyx.com/
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7289641/