Cosentyx is a prescription drug that is used to treat various conditions such as psoriasis, psoriatic arthritis, and ankylosing spondylitis. Like all medications, Cosentyx can cause side effects, some of which are more common than others.

According to the drug's official website [2], some of the most common side effects of Cosentyx include infections such as upper respiratory infections, diarrhea, and allergic reactions such as rash and hives. In addition, the website states that patients taking Cosentyx may experience a decrease in their white blood cell count, which can make them more susceptible to infections.

The website Healthline [3] also lists some common side effects of Cosentyx, which include fatigue, headache, and pain at the injection site. The article notes that these side effects are usually mild and go away on their own.

Drug Patent Watch [1] provides a comprehensive list of side effects associated with Cosentyx. Some of the most common side effects mentioned in the article include infections, diarrhea, and nausea. The article also notes that patients taking Cosentyx may experience a decrease in their platelet count, which can lead to an increased risk of bleeding.

In conclusion, the most common side effects of Cosentyx include infections, diarrhea, and allergic reactions. Patients taking Cosentyx may also experience a decrease in their white blood cell or platelet count, which can make them more susceptible to infections or bleeding. However, it is important to note that not all patients will experience these side effects, and some may experience side effects that are not listed here. Patients should always consult their doctor if they have any concerns about taking Cosentyx.

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.cosentyx.com/safety-and-side-effects
[3] https://www.healthline.com/health/drugs/cosentyx-side-effects