Vomiting can be prevented with the appropriate medications for most patients undergoing cancer treatment. However, patients may still have nausea without vomiting. These medications should be taken as prescribed before treatment and continued after treatment as directed by your doctor because the risk of vomiting may continue for several days after treatment.

If you have nausea and vomiting, even if you take your medication as prescribed, let your doctor know. Your doctor can recommend other medications to reduce nausea and vomiting and help prevent these symptoms during future cycles of chemotherapy. It is very important to call or see your doctor if you cannot keep food or water in your body because of severe nausea and vomiting. This can cause serious dehydration and electrolyte imbalance. It is also important to talk to your doctor if your symptoms worsen throughout treatment.