Pemetrexed single-agent chemotherapy may be effective for diseases such as non-small cell lung cancer, but there are individual differences in efficacy, and it should be used under medical supervision. Pemetrexed is commonly used in the form of injection, which can inhibit cell replication, prolong the action time of the drug on tumor cells, and inhibit the growth of mesothelioma cell lines and so on. It can be used in the treatment of non-small cell lung cancer, malignant pleural mesothelioma and so on. The efficacy of this product is subject to individual differences depending on the degree of sensitivity to the drug, the severity of the disease, and the timing of treatment. Common adverse reactions include myelosuppression, hepatic impairment, fatigue, nausea and loss of appetite. It is contraindicated in people with a history of hypersensitivity to pemetrexed or other ingredients. Yellow fever vaccination is contraindicated while using this product. The drug should be used under the guidance of a doctor, do not use the drug without authorization to avoid adverse consequences.