Cosentyx is a medication used to treat certain autoimmune diseases such as psoriasis, psoriatic arthritis, and ankylosing spondylitis. Like any other medication, it may cause side effects that vary from person to person. The timing of contacting a doctor about Cosentyx side effects depends on the severity and duration of the symptoms experienced by the patient.

According to Medical News Today [3], the most common side effects of Cosentyx include upper respiratory infections, diarrhea, and reactions at the injection site. These side effects are usually mild and go away on their own within a few days. However, if they persist or become severe, patients should contact their doctor.

In rare cases, Cosentyx may cause serious side effects such as infections, allergic reactions, and liver problems. Patients who experience any of these symptoms should contact their doctor immediately [3]. Additionally, patients with a history of tuberculosis or active tuberculosis should inform their doctor before taking Cosentyx [2].

Drug Patent Watch [1] notes that the FDA requires pharmaceutical companies to report any adverse events related to their products. Patients can also report side effects to the FDA through their MedWatch program.

The Cosentyx website [2] advises patients to contact their doctor if they experience any symptoms of COVID-19 while taking the medication. This includes fever, cough, and difficulty breathing.

In summary, patients should contact their doctor if they experience severe or persistent side effects from Cosentyx. Patients should also inform their doctor of any pre-existing medical conditions or symptoms of COVID-19 while taking the medication. Reporting any side effects to the FDA is also recommended.

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.cosentyx.com/covid19
[3] https://www.medicalnewstoday.com/articles/drugs-cosentyx-side-effects