Cosentyx is a medication used to treat psoriasis, psoriatic arthritis, and ankylosing spondylitis. The frequency of taking Cosentyx depends on the condition being treated. According to the official Cosentyx website, for psoriasis, the recommended dosage is an initial dose of 300 mg at weeks 0, 1, 2, 3, and 4, followed by a maintenance dose of 300 mg every 4 weeks. For psoriatic arthritis, the recommended dosage is an initial dose of 300 mg at weeks 0, 1, 2, 3, and 4, followed by a maintenance dose of 150 mg or 300 mg every 4 weeks, depending on the patient's response. For ankylosing spondylitis, the recommended dosage is an initial dose of 150 mg at weeks 0, 1, 2, 3, and 4, followed by a maintenance dose of 150 mg every 4 weeks [2].

It is important to note that the dosage and frequency of Cosentyx may vary depending on the patient's age, weight, and medical history. Therefore, it is crucial to follow the instructions provided by the healthcare provider and to not change the dosage or frequency of the medication without consulting a healthcare professional first.

Sources:
[2] https://www.cosentyx.com/psoriatic-arthritis/faq