The main drugs used in chemotherapy for gastric cancer include: 1. Cisplatin: a platinum drug, often used in combination with other drugs, can inhibit the growth and division of cancer cells. 2. 5-Fluorouracil: can inhibit DNA synthesis, affecting the growth and division of cancer cells. 3. Paclitaxel: can inhibit the division of cancer cells, often used in the treatment of gastric cancer. 4. Oxaliplatin: also a platinum drug, often used in combination with 5-Fluorouracil to improve efficacy. 5. Irinotecan: can inhibit DNA replication and transcription of cancer cells, often used in combination with other drugs. The above only lists some commonly used chemotherapy drugs. The specific treatment plan should be determined according to the patient`s specific situation, course of disease and doctor`s advice. Since each patient`s condition is different, the choice and dosage of chemotherapy drugs may also be different. Treatment should be carried out under the guidance of a professional doctor.