What should cancer patients do if they are suffering from vomiting after chemotherapy? There are many reasons for vomiting, including the side effects of chemotherapy and the adverse reactions of anti-cancer drugs: drugs to prevent or reduce nausea and vomiting: antiemetics inhibit vomiting reactions through different links, including the following categories: 1. Thiazides, such as chlorpromazine, promethazine, flunarizine, trifluoperazine, etc., mainly inhibit the emetic chemoreceptor area and are effective for all kinds of vomiting. 2. 2. antihistamines, commonly used in motion sickness vomiting, such as mineclizine, ankylamine, diphenhydramine, multiplying dizziness, etc. 3. anticholinergics, such as scopolamine, etc. Other drugs include metoclopramide, domperidone, antiemetic, chlorambucil, brominaprocaine, etc.