Præparater til behandling af erektil dysfunktion, inklusiv CIALIS, bør anvendes med forsigtighed hos patienter med anatomisk deformation af penis (såsom vinkling, kavernøs fibrose eller Peyronies sygdom) eller hos patienter, som på grund af deres tilstand kan være disponerede for priapisme (såsom seglcelleanæmi, myelomatose eller leukæmi).
Agents for the treatment of erectile dysfunction, including CIALIS, should be used with caution in patients with anatomical deformation of the penis (such as angulation, cavernosal fibrosis or Peyronie's disease), or in patients who have conditions which may predispose them to priapism (such as sickle cell anaemia, multiple myeloma or leukaemia).