Is there a treatment of psoriasis with cyclosporine?

Yes: Cyclosporin is a systemic medications used for severe psoriasis. It works quickly, but is toxic to the kidneys with long term use, so it is recommended that it be used for a limited period of time (6-12 months maximum). Generally it is used to get a patient through a short-term severe flare or to give rapid response while waiting for a slower acting medication like Methotrexate to "kick in".