What should you know about preventive chemotherapy?

Doctors may call this adjuvant chemotherapy when it follows surgery or radiotherapy. In some situations, chemotherapy is given before the main treatment to shrink a tumour or make later treatment easier. The plan depends on the cancer type, its stage, test results, previous treatment and your general health.

The word preventive describes the purpose of treatment, not a guarantee that cancer will be prevented. Chemotherapy travels through the bloodstream and targets cells that divide quickly. That can include cancer cells that are too small to appear on imaging, as well as some healthy cells. This is why treatment can affect the hair, mouth, digestive system and blood cells.

Treatment may be given through a vein, as tablets, or by another route chosen for your condition. It is commonly organised in cycles, with treatment followed by a recovery period. Blood tests and clinical checks help the team decide whether the next cycle should go ahead or whether the dose needs adjustment.

Ask for a written schedule showing the medicine names, appointment dates, contact number and instructions for missed doses. Tell the oncology team about every medicine, supplement, allergy and health condition before treatment starts. Some medicines can change how chemotherapy works or increase side effects.

Keep a record of symptoms between visits, including temperature if the team recommends checking it. Drink and eat according to the advice given for your treatment, plan transport if fatigue is expected, and ask about fertility, contraception, work, vaccinations and infection precautions before the first cycle. Do not start or stop a medicine without checking with the treating team.

Use the emergency contact instructions supplied by your cancer team for a fever, shaking chills, breathing difficulty, chest pain, confusion, fainting, uncontrolled bleeding or a sudden severe allergic reaction. Chemotherapy can lower infection-fighting blood cells, so an infection may become serious quickly even when symptoms seem mild.

Contact the team promptly about repeated vomiting, inability to keep fluids down, severe diarrhoea, new mouth sores that prevent drinking, painful urination, marked weakness, or redness and pain around an intravenous line. The team can assess the cause and provide treatment or change the plan safely.

Ask: What is the goal of chemotherapy in my situation? Which medicines will I receive, how will they be given, and how long will each visit take? Which side effects should I report immediately? What blood tests or scans will monitor treatment? Are there medicines to prevent nausea or protect fertility? Who should I call outside clinic hours?