What are anti-sickness drugs used for?

Nausea and vomiting can happen when treatment or illness activates the body’s vomiting pathways. Anti-sickness medicines work at different points in those pathways. A clinician may choose one medicine or combine medicines according to the likely cause, the treatment being given, previous symptoms, and other medicines you use.

Some are taken before treatment to prevent symptoms; others are taken at set times or when nausea starts. They do not treat the cancer itself, and they may not remove every symptom. Constipation, sleepiness, headache, or other effects can occur with some options.

Take the medicine exactly as prescribed, including any dose intended before treatment. Keep a record of when you take it, how much you drink, vomiting episodes, and whether you can keep medicines down. Small frequent sips and light meals may be easier if your team says they are suitable.

Tell your team about constipation, severe sleepiness, diabetes, liver or kidney problems, pregnancy, and all medicines or supplements. Do not add an over-the-counter remedy without checking for interactions.

Call your treatment team promptly if vomiting prevents you from keeping fluids or essential medicines down, your urine becomes very dark or infrequent, you feel faint, or nausea is not controlled. Seek urgent help for blood in vomit, severe abdominal pain, confusion, or difficulty breathing.

Ask when to take each medicine, whether it is preventive or for breakthrough symptoms, what side effects to watch for, and what to do if you vomit soon after a dose.