What if anti-sickness medication does not relieve nausea and vomiting from cancer treatment?

Nausea can relate to the treatment, pain, constipation, infection, dehydration, anxiety, or another medicine. Different treatments affect different pathways, so one anti-sickness medicine may not control every episode. Repeated vomiting can lead to dehydration, electrolyte changes, weakness, and difficulty taking important medicines.

Call the oncology team and describe when nausea starts, how often you vomit, what you can drink, and which doses you have taken. Follow the prescribed schedule and do not add, double, or stop medicines without advice. Small sips of fluid and plain, small meals may be easier to tolerate if your team has not given different instructions. Ask whether the treatment plan or anti-sickness combination should change.

Get urgent help if you cannot keep fluids down, pass very little urine, feel faint or confused, have severe abdominal pain, vomit blood, develop a fever, or become unusually drowsy or weak. Use the emergency contact provided by your cancer service.

Ask whether another cause is contributing, when to take each medicine, what to do after vomiting a dose, which drinks or foods are suitable, and which symptoms mean you should attend hospital.