Cosentyx is a medication used to treat psoriasis, psoriatic arthritis, and ankylosing spondylitis. According to the manufacturer's website, it works by blocking a specific protein in the immune system that causes inflammation, leading to the improvement of symptoms [2]. The drug patent watch website states that Cosentyx was approved by the FDA in January 2015 [1].

In a clinical trial conducted by the National Institutes of Health, it was found that the drug had a significant impact on the symptoms of psoriasis within the first 12 weeks of treatment [3]. Additionally, the study found that the drug was well-tolerated and had a low risk of adverse effects.

While the sources do not provide a specific timeline for when Cosentyx begins to take effect, the clinical trial results suggest that patients may begin to see improvements in their symptoms within the first 12 weeks of treatment. However, it is important to note that individual results may vary, and patients should consult with their healthcare provider for personalized information regarding the drug's effectiveness.

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.cosentyx.com/psoriatic-arthritis/how-cosentyx-works
[3] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5013855/