The typical duration of effects for Cosentyx can vary depending on the condition being treated. For plaque psoriasis, the effects of Cosentyx are generally seen within the first few weeks of treatment and can last for several months[2]. Cosentyx is a biologic drug with a half-life of approximately 21 days, meaning it stays in the body for a few weeks after administration[1]. It is important to follow the prescribed dosing schedule to maintain the effectiveness of the treatment[2].

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.cosentyx.com/plaque-psoriasis/treatment-dosing