Symptomatic control of severe, recalcitrant, disabling psoriasis not responsive to other forms of therapy and when diagnosis is supported by biopsy ( Oxsoralen-Ultra , 8-MOP capsule); use in conjunction with long-wave UV radiation for repigmentation of idiopathic vitiligo ( 8-MOP capsule, Oxsoralen lotion); with long-wave UV radiation of white blood cells (photopheresis) with the UVAR photopheresi