Ometinib is mainly used in the treatment of lung cancer, which can inhibit the proliferation and spread of cancer cells. When using it, you need to pay attention to its adverse reactions and contraindicated people. The drug is mainly indicated for the treatment of adult patients with locally advanced or metastatic non-small cell lung cancer (NSCLC) who have experienced disease progression during or after previous treatment with epidermal growth factor receptor (EGFR) tyrosine kinase inhibitors (TKI) and have been confirmed to be positive for the EGFR T790M mutation. Common side effects and adverse reactions to ometinib include gastrointestinal disturbances such as diarrhea, nausea, poor appetite, and constipation; dermatologic disorders such as rash, dry skin, fingernail (toenail) toxicity, and itching; and ophthalmologic disorders. Men and women who are preparing for pregnancy should avoid using the drug. People with liver and kidney impairment should use the drug with caution. When using ometinib for cancer treatment, you need to follow the doctor’s instructions and standardize the use of the drug. If there is any uncomfortable reaction, the drug should be stopped immediately for examination.