Medical Oncologist
Water and hydration
When you need fluids through a drip
When drinking cannot keep up. Nothing staying down for several hours, severe loose motions, no urine since the morning, or dizziness on standing. It is usually straightforward: a few hours in a day-care chair, and most people feel noticeably better by the end.
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
17+specialists on panel
15,000+patients treated
35+centres across Telangana & AP
4.8★ / 800+Google rating
The short answer
When are fluids through a drip needed?
When drinking cannot keep up. Nothing staying down for several hours, severe loose motions, no urine since the morning, dizziness on standing, or a kidney figure that has risen. At that point fluid has to go in directly, and no amount of effort with a glass will catch up.
It is usually straightforward: a few hours in a day-care chair, a drip of salt water, and most people feel noticeably better by the end. It does not usually mean admission and it does not mean anything has gone seriously wrong.
Fluids are also given deliberately with some drugs
Certain chemotherapy drugs are given with a drip of fluid before and after, to protect the kidneys or the bladder. That is planned rather than a rescue, and it makes treatment day longer, which is worth knowing in advance.
Do not wait for it to become an emergency
Families often try to manage vomiting and loose motions at home for two or three days and arrive when somebody is genuinely dry. Reporting early usually means a few hours of day-care fluids rather than an admission.
Ask for the number to call about vomiting and loose motions before you need it, and keep it on the fridge.When they are needed
The situations that call for a drip
- Nothing staying down
- Vomiting for several hours with no fluid retained. The commonest reason, and one where the anti-sickness cover also needs reviewing for the next cycle rather than only treating today.
- Severe loose motions
- Frequent or watery motions lose fluid and salts fast, particularly in hot weather. Bloody motions or motions with a fever need urgent assessment rather than fluids alone.
- No urine, or very dark urine
- Passing nothing since the morning is not something to watch. It indicates the kidneys are short of fluid and needs the same day's attention.
- Dizziness or fainting on standing
- A later sign, and a dangerous one because of falls. By this stage drinking will not correct it quickly enough and fluid through a drip is the sensible route.
- A rising kidney figure
- Sometimes picked up on the pre-cycle blood test in somebody who feels reasonably well. Fluids may be given to bring it down so the cycle can go ahead rather than being postponed.
- Planned, with certain drugs
- Given before and after treatment to protect the kidneys or bladder, along with instructions to drink a specific amount at home afterwards. This is part of the plan rather than a problem.
Not sure whether this applies to you?
Ask an oncologistWhat happens
What a session of fluids actually involves
Usually far less dramatic than families expect.
Assessment first
Blood pressure, pulse, how much urine you are passing, and usually a blood test for kidney function and salts. This decides how much fluid you need and whether anything else is going on.
Take with you
- Your treatment summary and medicine list
- When the vomiting or motions started
A cannula, or your port
If you have a port it can usually be used. Otherwise a cannula in the arm, which is the part most people mind. Warm hands and good hydration make it easier, which is awkward when you are there because you are dry.
A few hours in a chair
Salt water running slowly, sometimes with potassium or an anti-sickness medicine added. Take something warm, a phone charger and somebody with you, as for any day-care visit.
Expect
- To pass urine more often afterwards
- To feel noticeably better by the end
A plan for home
Ask what to drink, how much, which anti-sickness or anti-diarrhoea medicines to take and when to come back. Leaving without that plan is how people return two days later.
!
Go to the nearest emergency department the same day for these
No urine since the morning · nothing staying down for several hours · severe or bloody loose motions · dizziness or fainting on standing · confusion, extreme drowsiness or difficulty rousing someone · a fever, or shivering uncontrollably, alongside any of these · a racing heart with cold hands · severe stomach pain or a hard swollen stomach. Say clearly that the person is on chemotherapy and when the symptoms began. Do not keep trying to correct this at home.
Leave a number, we will call you
One field. No form to fill in, and no charge for the call.
Being straight with you
What this page cannot tell you
It cannot tell you whether you need fluids today. That is decided by examination, blood pressure and a blood test, not by how somebody looks across a room. If the warning list applies, go and let them assess it.
It also cannot tell you whether it will be day care or admission. Most people are managed in a chair and go home the same day. Somebody who is very dry, has a fever or has an abnormal kidney result may be kept, and that is the safer course rather than a bad sign.
Fluids treat the dryness, not the cause
If vomiting or loose motions brought you in, those need addressing too. Ask specifically what will be changed for the next cycle, because the same thing happening every cycle is a sign the supportive cover needs improving rather than repeating.
Ask about cost and cover
Day-care fluids are usually modest and may be billed separately from your treatment approval. Ask the insurance desk once, in advance, so an unplanned visit is not also an unplanned expense.
What to do next
Get the number to call about vomiting and loose motions and put it on the fridge. Report them on the first day rather than the third. Keep rehydration sachets in the house. Ask whether your drugs need planned fluids on treatment day. And ask what is being changed for next cycle.
Commonly believed
Four beliefs about drip fluids
"Needing a drip means things have become serious."
Usually it means somebody has been vomiting or having loose motions for a day or two and needs topping up. A few hours in a chair and most people go home feeling considerably better. It is routine supportive care.
"We should keep trying to make them drink at home."
At the mild end, yes, in small constant sips. Once nothing is staying down, urine has stopped or somebody is dizzy, drinking cannot catch up and waiting turns a day-care visit into an admission.
"A glucose drip will give strength and energy."
Fluids correct dehydration and salts; they are not nourishment and they do not build strength. If weight and eating are the problem, that needs a dietitian rather than repeated drips.
"If it happens every cycle, that is just how it is."
It is a sign the supportive cover needs improving. Anti-sickness medicines can usually be strengthened or changed, and planned fluids can be added. Ask what will be different next time rather than accepting a pattern.
Questions we are asked
Common questions about fluids through a drip
When are fluids needed rather than drinking?
When nothing is staying down, loose motions are severe, no urine has been passed since the morning, somebody is dizzy on standing, or a kidney figure has risen. At that point drinking cannot catch up.
Can it be done as day care?
Usually yes: a few hours in a chair and home the same day. Somebody who is very dry, has a fever or has an abnormal kidney result may be kept in, which is the safer course rather than a bad sign.
Does it mean treatment will be delayed?
Sometimes the next cycle is postponed briefly while things settle, and sometimes fluids are given precisely so the cycle can go ahead. Ask which applies, since either is normal management.
Will they use my port?
Usually it can be used, which avoids a cannula. Say you have one on arrival and carry your device card, since the staff seeing you in an unplanned visit may not know.
Do some drugs need fluids every time?
Yes. Certain drugs are given with fluids before and after to protect the kidneys or bladder, with instructions to drink a set amount at home afterwards. Ask whether your plan includes that.
Is a glucose drip good for weakness?
Fluids correct dehydration and salts rather than providing nourishment. If weakness is from not eating or losing weight, ask for a dietitian, because repeated drips will not address that.
How soon should we come in?
Report vomiting or loose motions on the first day, not the third. Early reporting usually means a few hours of fluids instead of an admission, and it lets the next cycle's cover be improved.
Is it covered by insurance?
Often, and sometimes billed separately from the main treatment approval. Ask the hospital's insurance desk once in advance, so an unplanned visit is not also an unplanned expense.
Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
Radiation Oncologist
Radiation Oncologist
Hematologist
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
Surgical Oncologist
Want a specific doctor for your case? Mention them when booking.
Book Free ConsultationBook an appointment with our specialist
Share your name and number — we'll call you back within 30 minutes to schedule your consultation.
Sources
- Cancer Research UK — Coping with chemotherapy side effects
- Macmillan Cancer Support — Sickness and diarrhoea
- National Cancer Institute — Chemotherapy and You
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.
Talk to us
Unable to keep fluids down?
Tell us what has been found so far and we will help you reach the right specialist. One helpline serves every CION centre.