The sources do not provide information on whether the dosage of Cosentyx differs based on weight or body mass index. However, the sources provide some information on the recommended dosage of Cosentyx for different medical conditions.

According to Drug Patent Watch [1], Cosentyx is a biologic drug that is used to treat various medical conditions such as psoriasis, psoriatic arthritis, and ankylosing spondylitis. The recommended dosage of Cosentyx depends on the medical condition being treated. For psoriasis, the recommended dosage is 300 mg administered by subcutaneous injection at weeks 0, 1, 2, 3, and 4 followed by 300 mg every 4 weeks. For psoriatic arthritis and ankylosing spondylitis, the recommended dosage is 150 mg administered by subcutaneous injection every 4 weeks.

A study published in the British Journal of Dermatology [3] evaluated the efficacy and safety of Cosentyx in the treatment of moderate-to-severe plaque psoriasis. The study found that a dosage of 300 mg administered by subcutaneous injection at weeks 0, 1, 2, 3, and 4 followed by 300 mg every 4 weeks was effective and safe in the treatment of moderate-to-severe plaque psoriasis.

Another study published in the Journal of the American Academy of Dermatology [2] evaluated the efficacy and safety of Cosentyx in the treatment of psoriasis. The study found that a dosage of 300 mg administered by subcutaneous injection at weeks 0, 1, 2, 3, and 4 followed by 300 mg every 4 weeks was effective and safe in the treatment of psoriasis.

In conclusion, while the sources do not provide information on whether the dosage of Cosentyx differs based on weight or body mass index, they provide information on the recommended dosage of Cosentyx for different medical conditions. The recommended dosage of Cosentyx depends on the medical condition being treated, and a dosage of 300 mg administered by subcutaneous injection at weeks 0, 1, 2, 3, and 4 followed by 300 mg every 4 weeks is recommended for the treatment of psoriasis.

Sources:
[1] https://www.drugpatentwatch.com/p/biologics/tradename/COSENTYX
[2] https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9320967/
[3] https://onlinelibrary.wiley.com/doi/full/10.1111/bjd.20971