Hematologist
CION Cancer Clinics
Your IV iron infusion, step by step | CION Cancer Clinics
Expect a few hours in a day-care chair. A nurse places a thin tube in a vein, the iron runs in slowly, and you are watched for a short while before going home the same day. You do not need to fast. Most people feel little more than a needle scratch. Your haemoglobin climbs over the following weeks, not on the day. This page explains how to prepare, what you may feel and which signs need help at once. At CION Cancer Clinics, our haematologist cares for anaemia, bleeding, clotting and inherited blood disorders, with ArogyaSri, CGHS and cashless insurance accepted.
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Medically reviewed by Dr. Basudev PokhrelConsultant Haematologist · last reviewed September 2026, next review due September 2027
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On this page
- What actually happens at an IV iron infusion?
- How should you prepare for the infusion?
- What happens from arrival to going home?
- What might you feel, and what should you do about it?
- What do families often believe about IV iron?
- What happens in the weeks after, and what can this page not tell you?
- Common questions about IV iron infusions
The short answer
What actually happens at an IV iron infusion?
A nurse puts a thin plastic tube into a vein in your arm, and iron runs in slowly from a drip or a syringe while you sit in a chair. Most people are in and out within a few hours, go home the same day and can eat normally.
Why iron is given this way
Iron tablets pass through the gut, and the gut only takes in a small share of what you swallow. IV iron skips that step. It goes straight into the blood, so your body can build up its stores far faster than tablets allow. It is usually offered when tablets have not worked or have caused too much stomach trouble, or when time is short, such as before surgery.
What it is not
An iron infusion is not a blood transfusion. No one else's blood is involved. It does not raise your haemoglobin, the oxygen-carrying part of the blood, on the same day either. It gives your bone marrow the raw material, and the marrow then makes new red cells over the following weeks.
Who it does not suit
It is usually not given if you have an active infection with fever, a previous serious reaction to IV iron, too much iron already, or a low haemoglobin caused by something other than a lack of iron. It is generally avoided in the first three months of pregnancy. Your haematologist checks these points before booking you in.
The medicine, the amount and the number of visits are decided by your treating team. This page describes the day, not the dose.Getting ready
How should you prepare for the infusion?
Eat and drink as usual
You do not need to fast. Have a normal breakfast and keep drinking water. A well-filled vein is easier to find, which means fewer attempts with the needle.
Bring your reports and medicine list
Carry your latest blood report, including the haemoglobin and ferritin lines, and a list of everything you take.
Say clearly if you
- Have asthma, eczema or severe allergies
- Reacted badly to any injection before
- Might be pregnant
Ask about your iron tablets
Some teams pause tablets around an infusion and some do not. Ask the team that booked you what they want. Do not stop or restart any medicine on your own.
Wear loose sleeves and bring someone
A loose shirt or kurta makes the arm easy to reach. A family member can help you home if you feel tired afterwards.
Not sure whether this applies to you?
Ask an oncologistOn the day
What happens from arrival to going home?
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Checks at the desk and the bedside
Your name, reports and allergies are confirmed. A nurse checks your blood pressure, pulse and temperature. If you have a fever, the infusion may be moved to another day.
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The cannula goes in
A cannula is a thin plastic tube placed in a vein, usually at the back of the hand or the inside of the elbow. It feels like a blood test. The needle comes out and only the soft tube stays in.
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The iron runs in
The iron is mixed with salt water in a bag, or given slowly by syringe. Depending on the medicine, this takes anything from a few minutes to longer. Some medicines need more than one visit.
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A nurse watches you throughout
Your pulse and blood pressure are checked again. Tell the nurse at once if the arm stings, swells or looks dark around the tube, or if you feel unwell in any way.
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A short wait afterwards
You stay seated and under watch for a period after it finishes, because the rare allergic reactions usually show up early. The cannula is then removed and a small dressing goes on.
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Home with written advice
You are told what to watch for and when your next blood test is due. Most people can travel home normally. Ask before driving if you felt dizzy.
During and after
What might you feel, and what should you do about it?
What you might notice
What to do
A metallic taste or a brief warm feeling
Common and passes. Mention it to the nurse.
Stinging, swelling or brown colour where the tube sits
Tell the nurse at once, so the drip is stopped before iron stains the skin
Headache, flushing or feeling sick
Tell the nurse. The drip can often be slowed.
Aching muscles or joints a day or two later
Usually settles on its own. Call the team if it does not.
Tiredness or bone pain in later weeks
Report it. Some medicines can lower blood phosphate, which a test can check.
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The one thing that cannot wait
If you, or the person you brought, has trouble breathing, a tight throat, swelling of the lips or face, a spreading rash, or feels faint during or after the infusion, act now. In the clinic, call the nurse immediately. At home, call 108 or go to the nearest emergency department, and say that IV iron was given today.
Commonly believed
What do families often believe about IV iron?
"I will feel full of energy by the evening."
Some people feel better within days, but the red cells themselves take weeks to build. Feeling the same on the first evening does not mean the infusion failed. The repeat blood test is what tells you how it is going.
"IV iron is dangerous, so tablets are always safer."
Serious allergic reactions are rare with the medicines used today, and staff are trained and equipped for them. Tablets are the usual first choice, but for someone who cannot absorb them, staying short of iron carries its own harm.
"Once the iron is topped up, the problem is solved."
The infusion replaces what was lost. It does not explain why it was lost. Heavy periods, bleeding in the gut or poor absorption still need to be found, or the stores will fall again.
"Iron tablets upset my stomach, so I will react to the drip too."
Stomach trouble from tablets comes from iron sitting in the gut. IV iron does not pass through the gut, so that history does not predict how you will feel on the day. Tell the team anyway.
Being straight with you
What happens in the weeks after, and what can this page not tell you?
You will usually be asked back for a blood test some weeks later. That test shows whether the haemoglobin has started to climb and whether the iron stores have filled.
Why the timing of the test matters
Ferritin, the blood marker of stored iron, can read misleadingly high soon after an infusion, because the new iron is still in the blood. A test done too early can make stores look fuller than they are. Reference ranges also differ between laboratories, and one result is always read alongside how you feel and earlier reports.
What this page cannot tell you
It cannot tell you which medicine you will get, how much, or how many visits you need. It cannot tell you why you became short of iron. At CION, the haematology team reviews your reports, looks for the cause and plans the infusion around it, so the answer fits your own case.
Questions we are asked
Common questions about IV iron infusions
Does an iron infusion hurt?
The needle feels like an ordinary blood test, a short sharp scratch. Once the soft tube is in, most people feel little more than a cool sensation in the arm. If the site stings or swells while the iron runs in, tell the nurse straight away, because that can mean the iron is leaking under the skin.
How long will I be at the hospital?
It depends on the medicine used and how busy the day-care unit is. Plan for a few hours in total, including the checks before, the infusion itself and the wait afterwards. Your team will tell you when you book, and whether you need to come back for a second visit.
Can I eat, and can I go to work afterwards?
Yes, you can eat and drink normally before and after. Many people return to light work the next day, though some feel tired or achy for a day or two. Ask before driving if you felt dizzy during the infusion.
Can the iron stain my skin?
Rarely, if iron leaks out of the vein into the skin, it can leave a brown mark that may last a long time. Speak up the moment the arm stings, swells or changes colour, so the drip can be stopped early.
When will I start to feel better?
It varies. Some people notice more energy within a week or two, while for others it takes longer, especially if the haemoglobin was very low. The blood test your team arranges is a better guide than how you feel on any single day.
Can I have IV iron during pregnancy?
It is generally avoided in the first three months of pregnancy. Later in pregnancy it is sometimes used when tablets have not worked and delivery is getting closer. Tell the team if there is any chance you are pregnant, and let your obstetrician and haematologist decide together.
Should I keep taking iron tablets after the infusion?
That is for your treating team to decide. Some people continue tablets, some pause them for a while and some stop altogether. Do not change anything on your own. Ask before you leave the unit, and write down the answer.
Is IV iron covered by insurance or Aarogyasri?
Cover depends on your policy, the reason for the infusion and whether it is day care. Aarogyasri, CGHS, ECHS, EHS and PM-JAY rules differ and change, so check your current entitlement before the day. Call the helpline with your card details and we will help you check what applies.
Your Haematologist
Meet CION's haematologist. One specialist for your blood report and your plan.
Dr. Basudev Pokhrel reviews blood counts, transfusion needs and blood disorders, and works with the CION tumour board on blood cancers.
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Sources
- NHS — Iron deficiency: treatment
- National Heart, Lung, and Blood Institute — Iron deficiency: diagnosis and treatment
- American Society of Hematology — Blood disorders: patient education
- National Health Mission — National Health Mission
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.
Keep reading
Related pages
IV Iron: When Tablets Are Not EnoughWhy IV iron is advised in the first placeHow Long Iron Treatment Takes to WorkWhat the follow-up blood test should showReading a Ferritin ResultMake sense of the stores number on your reportRecurrent Iron Deficiency: Finding the Real CauseWhen iron keeps running low after treatmentIron DeficiencyThe full guide to low iron
Talk to us
Been told you need IV iron?
Share your blood reports with us. CION's haematology team will explain why it has been advised, look for the cause of the iron loss and plan the infusion with you. One helpline serves every CION centre.