- Is currently taking or requires the following prohibited medications or treatments during the treatment period: drugs potentiating the nephrotoxicity of voclosporin such as chronic NSAID's or ACE inhibitors, drugs interfering with it's pharmacokinetics; drugs considered to contribute to psoriasis flare; or, systemic and topical psoriasis medication (including psoralen/ultraviolet A light treatment) that may interfere with assessment of study drug efficacy.