Uses of a paroxetine medicament in preparing a pharmaceutical composition for treatment of cancer. The cancer refers to one or more among lung cancer, bladder cancer, cervical cancer, prostate cancer, breast cancer, ovarian cancer, gastric cancer, liver cancer, colorectal cancer, pancreatic cancer, and tongue cancer. The effective dose is 20 to 500 mg/kg/day.Linvention a pour objet lapplication de la paroxétine pour la préparation dune composition pharmaceutique inhibant le cancer, notamment le cancer du poumon, le cancer de la vessie, le cancer du col de lutérus, le cancer de la prostate, le cancer du sein, le cancer de lovaire, le cancer de lestomac, le cancer du foie, le cancer du gros intestin, le cancer du pancréas ou le cancer de la langue selon une posologie quotidienne de 20-50 mg/kg.