Can nausea and vomiting from chemotherapy be prevented?

Yes—often it can. Medicines called antiemetics (antinausea drugs) work well to prevent and relieve nausea and vomiting in people with cancer.

Timing matters a lot. You will usually receive antinausea medicine before chemotherapy starts, because once nausea and vomiting from chemotherapy develop, they are more difficult to treat. Your doctor may prescribe more than one type and will tell you exactly when to take them—such as before or after treatment, or a certain time before eating.

There are many kinds of antiemetics, and your doctor will choose the ones that fit your situation. Preventing nausea and vomiting is important because, if uncontrolled, vomiting can lead to serious problems such as dehydration, electrolyte imbalances, and weight loss.

Alongside medicine, everyday steps can help—sipping fluids, eating bland or cold foods, avoiding strong food odors, and eating small, frequent meals. If you're worried about nausea or already having it, tell your health care team. They can help you find ways to get relief or prevent it before it starts.