Cosentyx is a prescription medication used to treat various autoimmune diseases, including psoriasis, psoriatic arthritis, and ankylosing spondylitis. While it is generally safe and effective, there are potential side effects and complications to be aware of.

According to the drug's official website [2], some of the most common side effects of Cosentyx include cold symptoms, diarrhea, and upper respiratory infections. Other possible side effects include headaches, back pain, and injection site reactions. These side effects are generally mild and go away on their own, but patients should still report any symptoms to their doctor.

More serious complications can occur with Cosentyx use, though they are rare. One of the most concerning potential side effects is an increased risk of infections, including serious and sometimes life-threatening infections like tuberculosis. Patients should be aware of the signs of infection, such as fever, chills, and coughing, and report any symptoms to their doctor immediately [2].

Cosentyx can also affect the immune system in ways that can lead to other complications. For example, the medication may increase the risk of cancer, particularly certain types of skin cancer. Patients should protect their skin from the sun and report any unusual skin growths to their doctor [3].

Other potential complications of Cosentyx use include liver damage, eye problems, and allergic reactions. Patients should discuss their medical history and any other medications they are taking with their doctor before starting Cosentyx [1].

In summary, while Cosentyx is generally safe and effective, there are potential complications to be aware of. Common side effects include cold symptoms, diarrhea, and upper respiratory infections, while more serious complications can include an increased risk of infections, cancer, and liver damage. Patients should report any symptoms to their doctor and discuss their medical history and other medications before starting 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