Medical Oncologist
Your first cycle
The first two days after chemotherapy
Often less than you feared. Most people get home from a first cycle feeling much as they did that morning, sleep heavily, and find the real effects arrive over the following days. Drowsiness, a flat tiredness, a metallic taste and a poor appetite are all ordinary here. A fever is not — at any point in the cycle that is an emergency, and it is the thing families most often decide to sleep on.
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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The short answer
What should you expect in the first two days?
Often less than you feared. Most people get home from a first cycle feeling much as they did that morning, sleep heavily, and find the real effects arrive over the following days rather than that night.
What is ordinary in this window: drowsiness, a flat heavy tiredness, a metallic taste, a poor appetite, and sometimes sickness starting towards the end of the first day. Being unusually awake and hungry that night is also ordinary — that is the steroids.
The thing that is not ordinary
A fever. At any point in the cycle, including this one, a fever during chemotherapy is an emergency and needs an emergency department the same day. That is the single most important sentence on this page, and it is the one families most often decide to sleep on.
Keep a thermometer in the house and use it properly. "He feels a bit warm" is not something a team can act on.
!
Go to the emergency department, do not wait for morning
A fever, or shivering uncontrollably · breathlessness, chest pain or a racing heart · a rash, or swelling of the face, lips or tongue · nothing staying down · no urine passed since the morning · severe stomach pain, or a swollen hard stomach · bleeding that will not stop · drowsiness or confusion beyond ordinary sleepiness · pain, redness or swelling around a port or drip site. Say clearly at reception that the person is on chemotherapy. Do not give paracetamol to bring a temperature down before being seen — it hides the fever without treating the cause.
Not sure whether this applies to you?
Ask an oncologistSorting it out
Ordinary in this window, and not
Expected, manage at home
Call, or go in
Heavy drowsiness, sleeping a lot
Confusion, or being very hard to rouse
Feeling mildly sick, eating little
Vomiting where nothing stays down
A metallic taste, food tasting flat
A mouth too sore to drink
Being wide awake and hungry that night
Any fever, or shivering
Passing urine more often, or a changed colour
Little or no urine since the morning
Mild aches, or feeling washed out
Breathlessness, chest pain, or a rash
What to do
Getting through the window well
Take the anti-sickness medicine on schedule
From that first evening, at the stated times, for the stated number of days, even if you feel completely well. They work preventively. Starting them late is the commonest reason a plan appears to fail — set phone alarms before you leave the hospital.
Keep drinking
Steadily through the day rather than in large amounts. Several drugs are cleared through the kidneys and fluid helps that happen. Judge it by urine — pale and passed regularly is what you want.
Eat small and plain
Something every couple of hours rather than meals, cool rather than hot. An empty stomach makes sickness worse. Curd rice, kanji, buttermilk, banana, dry biscuits.
Rest, but do not spend the whole day flat
Sleep when you need to, and get up and move a little between times. Lying flat all day worsens constipation, reflux and stiffness, and makes the tiredness feel heavier than it is.
Follow the simple home precautions
Lid down when flushing, wash hands afterwards, and wash anything soiled separately, for the period your team specified. Nothing else about household life needs to change.
Write it down
One line a day — how sick, what stayed down, temperature, bowels, what helped. This is what lets the team make the next cycle easier, and nobody reconstructs it accurately three weeks later.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
For the household
What the family should have ready
Most of the trouble in this window comes from not having decided things in advance. Sort them out on the evening of treatment, while everyone is still calm, rather than at two in the morning.
The three decisions
Which hospital you would go to at night. Who would take the person there. And where the helpline number is written, so that whoever is present can find it. Put it on the fridge, not only in one person's phone.
What to have in the house
A thermometer. Boiled and cooled drinking water. Curd, buttermilk, bananas and cooked rice in the fridge. The anti-sickness medicines already collected rather than still at the pharmacy. Rehydration sachets if your team has said they are suitable.
Do not leave them alone the first night
Not because something is likely, but because the person is drowsy from pre-medication and may not judge their own condition well. Someone in the house who can check the temperature and make a decision is worth more than any preparation.
Watch what actually goes in
Count glasses and note urine passed rather than asking whether they are drinking enough. People routinely say they are fine while very little has gone in, and dehydration is the commonest avoidable reason for an admission in the days after a cycle.
If you are unsure whether something warrants a call, call. Teams would far rather answer an unnecessary question than see someone late.Being straight with you
What this page cannot tell you
It cannot tell you how your own first cycle will go. Drugs differ enormously in what they do and when, and people on identical schedules have very different first days. What is described here is the common shape, not a prediction.
It also cannot tell you whether a symptom you are having is expected. No list covers everything, and something being unfamiliar is a reason to ask rather than to assume it is unimportant. When in doubt, and especially with a fever, act rather than wait.
What to do next
Set the alarms for the anti-sickness medicine tonight. Put the helpline number and the hospital name on the fridge. Check there is a thermometer in the house. Start the written record. And agree who is staying with the person for the first night.
Questions we are asked
Common questions about the first days
He is sleeping almost constantly. Is that alright?
Heavy drowsiness is expected, mostly from the pre-medication rather than the chemotherapy. What is different is confusion, being very hard to rouse, or drowsiness alongside a fever or very little urine. Those need an emergency department the same day rather than watching.
Should I take the anti-sickness tablets if I feel fine?
Yes, exactly as prescribed and for the full number of days. They work preventively, and the reason you feel fine may well be that they are working. Waiting until sickness starts is the commonest reason people conclude the medicines do not help.
My urine has changed colour. Is that a problem?
Some drugs colour the urine for a short period after treatment, and you should have been warned if yours does. Dark concentrated urine is different and usually means you are not drinking enough. Blood in the urine, or pain passing it, should be reported the same day.
Can I go to work the next day?
Some people do, particularly on gentler schedules, but do not commit to it before your first cycle. You will not know how you react until afterwards. Plan to be at home and treat anything you manage beyond that as a bonus.
Is it safe to be around my grandchildren?
Yes. Ordinary contact including hugging is completely safe. The home precautions are about handling urine, vomit and soiled laundry, not about being near people. What matters in the other direction is keeping away from anyone who is actually unwell.
He has a slight temperature but seems well. Do we wait?
No. A fever during chemotherapy is an emergency regardless of how well someone looks, because the white cells that fight infection may be low. Go to the nearest emergency department the same day, say they are on chemotherapy, and do not give paracetamol first.
When will the difficult days be?
For most people, the few days after this window rather than within it, with a separate dip later when blood counts fall. Ask your team when your counts are expected to be lowest, as that is the period where infection risk is highest and care matters most.
Nothing has happened at all. Should I be worried?
No. A quiet first cycle is common and it says nothing about whether the treatment is working, which is judged on scans and tests. It reflects which drugs you are on and how well the supportive medicines are doing their job. Keep taking them on schedule.
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Sources
- Cancer Research UK — Cancer drugs side effects
- National Cancer Institute — Chemotherapy to Treat Cancer
- Macmillan Cancer Support — Side effects of chemotherapy
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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