Siak is the imported Vincristine, which is an anti-tumor chemotherapeutic drug of Vincristine class. At present, it is widely used in the clinic for lymphoma, leukemia and other malignant tumors, which has a good purpose of killing cancer cells. It is very widely used in the clinic, and the main side effects of Vincristine or Cialis are hematologic toxicity, neurotoxicity, digestive system toxicity and so on. Hematological toxicity is mainly manifested by the occurrence of leukopenia, granulocyte deficiency, anemia, thrombocytopenia and so on. Digestive system side effects are mainly manifested as poor appetite, impaired digestive function, decreased appetite, and diarrhea. It can also manifest numbness, abdominal distension and other discomforts, but compared with the efficacy, the side effects of Cialis are relatively small.