Medical Oncologist
Oral chemotherapy
When to stop taking oral chemotherapy and call
Some side effects mean your next chemotherapy tablet should be held until you have spoken to your team: fever, significant diarrhoea, repeated vomiting, painful mouth sores, blistering hands or feet, bleeding or jaundice. For other concerns, keep taking tablets as prescribed and call for advice. Never stop or restart treatment on your own without guidance.
NG
Medically reviewed by Dr. Naresh GunduConsultant Medical Oncologist · MBBS, DNB (Internal Medicine), DM (Medical Oncology, AIIMS) · last reviewed September 2026, next review due September 2027
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Hold your next tablet and call your team straight away for any of these
Fever or shivering, or feeling suddenly very unwell · diarrhoea several times a day, at night, or with dizziness · vomiting that stops you keeping fluids or tablets down · painful mouth sores that stop you eating or drinking · red, swollen, blistering or peeling hands or feet that make walking or using your hands difficult · unusual bleeding, black stools or large bruises · yellowing of the eyes or skin · chest pain, breathlessness or a racing heartbeat. Go to the nearest emergency department for fever with feeling unwell, chest pain or heavy bleeding, and say clearly that the person is on oral chemotherapy.
The short answer
When should you stop taking oral chemotherapy and call your team?
Some side effects mean the next dose should be held until you have spoken to your team. These are the effects that can become dangerous if more medicine is taken: fever or signs of infection, significant diarrhoea, repeated vomiting, painful mouth sores that stop eating or drinking, blistering or very painful hands and feet, unusual bleeding, jaundice, and chest pain or breathlessness. With several oral medicines, continuing to take tablets while these effects develop can quickly make them much worse, whereas a short pause, supportive treatment and sometimes a dose adjustment allow treatment to continue safely later. Your team should give you a written list of these warning signs at the start of treatment.
The other half of the message is equally important. You should not stop or change oral chemotherapy on your own for any other reason, such as feeling well, worrying about long-term effects, mild side effects, advice from friends, or a new remedy. Stopping without guidance can make treatment less effective. If you are unsure whether a symptom is serious enough to hold a dose, call your helpline before the next tablet is due and ask. Teams would much rather receive a call that turns out to be minor than miss a problem that is developing. Once you have spoken to them, follow their advice exactly, including when and how to restart, and record it in your dose diary. Never restart at a higher dose to catch up on held tablets.
Hold, then call
For the warning signs listed, do not take the next dose until your team has advised you.
Mild effects: keep taking and tell your team
Mild nausea, tiredness or slight skin dryness usually do not mean stopping, but should still be mentioned.
Restart only on advice
Your team will tell you when to restart and whether the dose changes.
Ask your team to mark on your safety card which symptoms mean holding your specific tablets.Not sure whether this applies to you?
Ask an oncologistWhich side effects mean stop
Warning signs and why they matter
- Fever or signs of infection
- May mean low white cells. Infection can become serious within hours and needs urgent assessment.
- Significant diarrhoea
- Several loose stools a day, diarrhoea at night or with cramps can quickly cause dehydration.
- Repeated vomiting
- Stops fluids and medicines staying down, and makes dosing unpredictable.
- Painful mouth sores
- Sores that stop eating or drinking suggest the gut lining is affected more widely.
- Severe hand-foot syndrome
- Blisters, peeling or pain that limits walking or using hands needs a treatment break.
- Bleeding, jaundice, chest pain
- May signal low platelets, liver effects or heart problems, all needing prompt review.
Who do you call
What to do step by step
Recognise the warning sign
Check your safety card or written list of symptoms that mean holding a dose.
Do not take the next dose
Hold the tablet until you have spoken to your team.
Call your helpline
Give your name, medicine, dose, when symptoms started, and your temperature if you have a thermometer.
Follow the advice
You may be asked to come in, have tests, take other medicines or go to emergency.
Record and restart only on advice
Write the advice in your diary and restart only when told, at the dose you are given.
Leave a number, we will call you
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Being straight with you
What this page cannot tell you
It cannot tell you exactly which symptoms mean holding your particular medicine, or when to restart. Different tablets have different warning signs and rules, and targeted medicines may have additional ones, such as high blood pressure or specific skin reactions. Your team will give you instructions for your treatment.
It also cannot tell you whether a symptom is caused by the chemotherapy or by something else. Infections, other medicines and other illnesses can cause similar problems, and your team may need to assess you.
If the helpline is closed
Hold the dose and seek urgent care if symptoms are severe. Do not wait until morning with fever or heavy bleeding.
Temperature matters
Keep a working thermometer at home and check your temperature if you feel unwell.
Dehydration from diarrhoea
Drink fluids while waiting for advice, and seek urgent care if you feel dizzy or pass little urine.
Mild side effects still matter
Report them at your next contact, as early management can prevent them worsening.
Deciding to stop for other reasons
If you want to stop because of worries, cost or side effects, talk to your team first.
Older adults and carers
Carers should know the warning signs and have the helpline number.
Dose changes after a break
Many people restart at a lower dose after a severe side effect. This is common and helps treatment continue.
Keep the packaging handy
Take your tablets and diary with you if you go to hospital.
Why holding a dose can be protective
With many oral chemotherapy medicines, side effects are directly linked to how much medicine is in the body. When a serious effect such as severe diarrhoea, painful mouth sores or blistering hands and feet develops, taking more tablets adds to the damage while the body is still trying to heal. A short pause gives the gut lining, skin or bone marrow time to recover. Your team can then decide whether to restart at the same dose, a lower dose or a different schedule. Many patients worry that a pause will harm their chances, but a planned break in response to serious side effects is a routine part of safe treatment, and it often allows people to complete more of their course overall.
Preparing so you can act quickly
Keep a thermometer at home, save the helpline number in your phone and on your safety card, keep oral rehydration solution in the house, and make sure a family member knows which symptoms mean holding tablets. If you live far from the hospital, identify the nearest emergency department in advance. Being prepared means that when a warning sign appears, you can hold the dose and get advice without delay.
What to do next
Get a written list of warning signs for your tablets, keep it with your medicine, hold the next dose and call for any of those signs, never stop or restart on your own for other reasons, record all advice in your diary, and go to emergency for severe symptoms.
Commonly believed
Four beliefs about stopping tablets
"I should push through side effects to finish my course."
For warning signs, continuing can cause serious harm. Hold and call.
"If I feel better, I can stop the tablets."
Feeling well is not a reason to stop. Continue unless advised otherwise.
"After a break, I should take extra to catch up."
Never catch up. Restart only as your team advises.
"Calling about side effects is a bother to the team."
Teams want these calls. Early advice keeps you safe.
Questions we are asked
Common questions about stopping and calling
Which side effects mean I should stop my tablets?
Fever, significant diarrhoea, repeated vomiting, painful mouth sores, blistering hands or feet, bleeding, jaundice, chest pain or breathlessness. Hold and call.
Should I ever stop on my own?
Only hold the next dose for warning signs, then call. Do not stop for other reasons without advice.
Who do I call?
Your chemotherapy helpline or oncology nurse. For severe symptoms, go to the emergency department.
When can I restart?
Only when your team advises, sometimes at a lower dose.
Should I take missed tablets later?
No. Never catch up on held doses unless specifically told.
What if the helpline is closed?
Hold the dose and seek urgent care for severe symptoms.
Do mild side effects mean stopping?
Usually not, but mention them so they can be managed early.
Will my dose change after a break?
It may. Dose adjustments are common and help treatment continue safely.
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Sources
- Cancer.Net (ASCO) — What to Know About Oral Chemotherapy
- American Cancer Society — Oral Chemotherapy: What You Need to Know
- Cancer Research UK — Chemotherapy tablets
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
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