Cosentyx is a medication used to treat psoriatic arthritis, ankylosing spondylitis, and plaque psoriasis. According to the sources provided, there is no maximum safe dosage of Cosentyx mentioned. However, the dosage and administration of the drug may vary depending on the patient's condition and the severity of the disease.

The recommended dosage for Cosentyx is 300 mg administered by subcutaneous injection at weeks 0, 1, 2, 3, and 4, followed by a maintenance dose of 300 mg every 4 weeks. For patients with moderate to severe plaque psoriasis, the recommended dose is 300 mg administered by subcutaneous injection at weeks 0, 1, 2, 3, and 4, followed by a maintenance dose of 300 mg every 4 weeks or 150 mg every 4 weeks, depending on the patient's response to treatment. For patients with active ankylosing spondylitis, the recommended dose is 150 mg administered by subcutaneous injection every 4 weeks.

It is important to note that the dosage and administration of Cosentyx should be determined by a healthcare professional, and patients should follow their healthcare provider's instructions carefully. Patients should also inform their healthcare provider of any other medications they are taking to avoid potential drug interactions.

In conclusion, while there is no maximum safe dosage of Cosentyx mentioned in the sources provided, the dosage and administration of the drug should be determined by a healthcare professional based on the patient's condition and response to treatment. Patients should follow their healthcare provider's instructions carefully and inform them of any other medications they are taking.

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.cosentyx.com/psoriatic-arthritis/treatment-dosing
[3] https://www.drugs.com/dosage/cosentyx.html