14571 Intravenous Iron Supplementation

Overview

Intravenous iron — usually just called 'IV iron' — is iron that is given straight into a vein through a thin tube, instead of as a tablet you swallow. Iron is a mineral your body needs to make red blood cells, which carry oxygen around your body. When your iron stores run low, you can become anaemic: you feel tired, short of breath and washed out. IV iron tops up your iron quickly when tablets are not enough, upset your stomach, or would simply take too long to work.

Yes. IV iron is a very common, everyday treatment in hospitals and clinics around the world. Millions of doses are given each year, and staff who give it do so regularly.

It is used for anyone with low iron stores who cannot be treated well with tablets. That includes people with heavy periods, pregnancy, bleeding in the gut, kidney disease, inflammatory bowel conditions, coeliac disease, and people who have had certain types of stomach or bowel surgery. It is also used before some operations and for people on dialysis.

Symptoms

Common symptoms

• Feeling very tired or lacking energy, even after rest
• Getting out of breath with everyday things like walking upstairs
• Looking pale, or paler than usual
• Headaches, dizziness or feeling light-headed
• A noticeably fast heartbeat or awareness of your heartbeat (palpitations)
• Cold hands and feet
• Brittle nails, or hair that seems to be thinning
• A sore or smooth tongue, or cracks at the corners of the mouth
• Restless legs, especially at night
• Unusual cravings for things that are not food, such as ice or earth (this is called pica)
• Finding it harder to concentrate or to exercise as you used to

Symptoms in children

• Tiredness, or being less active than usual during play
• Poor appetite, or eating less than expected
• Being irritable, tearful or clingy
• Struggling to concentrate at school or seeming 'not themselves'
• Catching infections more often than usual
• Craving or chewing non-food items such as ice, paper or soil
• Slower growth or weight gain than expected for their age

Symptoms in older adults

• Breathlessness or tiredness that is put down to 'just getting older'
• Palpitations or a fast heartbeat
• Feeling dizzy, unsteady, or having falls
• Confusion or worsening memory, which can be caused by anaemia
• Making existing heart or lung problems feel worse
• Looking pale, or feeling the cold more than usual

Causes

Main causes

• Blood loss — heavy periods, bleeding in the gut, or blood loss during surgery
• Not getting enough iron from food, especially with a limited diet
• Poor absorption — conditions such as coeliac disease, inflammatory bowel disease, or surgery on the stomach or bowel
• Higher needs than usual — pregnancy, breastfeeding, or rapid growth in children and teenagers
• Long-term conditions such as kidney disease, heart failure or some cancers
• Medicines that can cause bleeding in the stomach, such as long-term anti-inflammatory painkillers or blood thinners

Risk factors

• Having heavy periods
• Being pregnant or having recently given birth
• Following a vegetarian or vegan diet without iron-rich alternatives
• Having coeliac disease or inflammatory bowel disease
• Having had weight-loss (bariatric) surgery or stomach surgery
• Kidney disease, especially if you are on dialysis
• Being an older adult, particularly if you take blood thinners
• Frequent blood donation
• Being a child or teenager going through a growth spurt

When to see a doctor

See a doctor urgently if:

• Black, tarry stools, or blood in your stool
• Vomiting blood
• Very heavy vaginal bleeding, or bleeding between periods
• Chest pain, fainting, or severe breathlessness
• A fever or feeling generally unwell after an iron infusion
• Increasing redness, swelling or pain at the infusion site

Book a routine appointment if:

• Persistent tiredness or breathlessness that is not improving
• Looking pale, or people commenting that you look washed out
• Hair thinning, brittle nails, or a sore tongue
• Restless legs at night
• Unusual cravings for ice, earth or other non-food items
• A family history of anaemia or a bleeding disorder
• Heavy periods that affect your daily life

Diagnosis

Your doctor starts by asking about your symptoms, your diet, your periods, any bleeding, your medicines and your medical history, and will examine you. A simple blood test usually confirms whether your iron stores are low. If they are, your doctor will look for the reason — for example by checking for coeliac disease or bleeding in the gut — because treating the cause matters as much as replacing the iron.

Tests that may be done

• Full blood count — shows how many red blood cells you have and how large they are
• Ferritin test — ferritin is a protein that stores iron; a low level usually means low iron stores
• Iron studies, including transferrin saturation — another way of measuring the iron available for making red blood cells
• Vitamin B12 and folate tests — these can also cause anaemia
• A coeliac screening blood test
• Stool tests, if bleeding in the gut is suspected
• Urine tests, and sometimes a pregnancy test
• Referral for a camera test of the stomach or bowel (endoscopy or colonoscopy) if the cause is unclear
• Kidney function tests, which also help plan the right iron treatment

What to expect at your appointment

The tests are straightforward blood tests, usually taken at your GP surgery or a clinic. Results often come back within a few days. If IV iron is recommended, you will usually be offered an appointment at a day unit or clinic. On the day, a nurse will check your details, place a small tube in a vein in your arm or hand, and give the iron slowly while watching you. You can usually eat, drink and take your usual medicines, and most people go home the same day. Many units ask you to stay for a short while afterwards for observation.

Treatment

The aim is to rebuild your iron stores and get your red blood cells back to normal, and also to treat whatever caused the shortage. Iron tablets are usually tried first, because they are simple and work well for many people. IV iron is offered when tablets are not absorbed properly, cause troublesome side effects, are not working, or when your iron needs to be replaced quickly — for example in later pregnancy, before an operation, or with ongoing blood loss. Your doctor will discuss which option suits you and will also look into the underlying cause.

Self-care at home

• Include iron-rich foods in your diet: red meat, poultry, fish, eggs, beans, lentils, chickpeas, tofu, dark green leafy vegetables, nuts and fortified cereals
• Pair plant sources of iron with something rich in vitamin C — such as citrus fruit, peppers, tomatoes or broccoli — to help your body absorb it
• Keep tea, coffee and calcium-rich drinks away from mealtimes, as they can reduce how much iron you absorb
• Get plenty of rest while your energy builds back up, and pace yourself rather than pushing through exhaustion
• Keep a note of your symptoms so you can tell your care team what has changed
• Tell any healthcare professional that you have had IV iron, especially before blood tests or scans
• Attend follow-up blood tests so your team can check that your iron levels have recovered

Medical treatments

Treatment usually begins with iron tablets taken by mouth, sometimes alongside vitamin C to help absorption. When tablets are not suitable, iron can be given into a vein through a drip. It is given by trained staff in a clinic or day unit, with monitoring during and after the infusion. The number of sessions depends on how low your iron is and which preparation is used — some people need just one, others a short course over several weeks. Your team will also treat the cause of your low iron, which may mean managing heavy periods, treating a gut condition, or reviewing medicines that cause bleeding. If your anaemia is severe, a blood transfusion may occasionally be needed. Always speak to your doctor or pharmacist before starting or stopping any supplement or medicine.

When is surgery considered?

Surgery is not used to treat low iron itself. However, if the iron shortage is caused by a problem that needs an operation — such as fibroids causing heavy periods, or a bleeding point in the gut — your doctor may discuss surgical options with you. IV iron is sometimes given before an operation to get your blood counts up beforehand, which can reduce the need for a transfusion.

Living with this condition

Most people carry on with normal life around their infusions. You may feel tired for a day or two afterwards, and some people get a mild headache or aching muscles. Energy usually improves gradually over several weeks rather than overnight, so be patient with yourself. Keep taking any other medicines as usual unless your doctor says otherwise, and go to your follow-up appointments so your levels can be checked.

Lifestyle tips

• Build a steady routine of iron-rich meals rather than relying on supplements alone
• Stay gently active — walking and light exercise can help you feel better, but rest when you need to
• Aim for regular, good-quality sleep while your energy recovers
• Avoid smoking and limit alcohol, as both can affect your overall health and how you feel
• Track your periods if you have heavy bleeding, so you can describe the pattern to your doctor
• Ask your pharmacist or doctor before taking new supplements, as some can interfere with iron absorption

Diet and exercise

Food is an important partner to treatment. Iron from meat, fish and poultry is absorbed most easily; iron from beans, lentils, tofu, leafy greens, nuts and fortified cereals is absorbed better when eaten with vitamin C. Try to have a varied diet and avoid drinking tea or coffee with meals. Gentle exercise — such as walking, swimming or cycling — helps your heart and lungs and lifts your mood. Start slowly if you have been very tired, and build up as your energy returns. Your GP or practice nurse can advise on a suitable level of activity.

Mental health and emotional wellbeing

Long-lasting tiredness can wear you down, and it is very common to feel low, anxious or frustrated when your energy is not what it was. These feelings usually ease as your iron levels recover, but they deserve attention in their own right. Talk to your doctor if low mood, worry or exhaustion is affecting your sleep, work or relationships — support is available and it helps. If you ever feel you cannot cope or have thoughts of harming yourself, contact your local crisis service or emergency services straight away, or reach out to someone you trust.

Prevention

Often, yes — or at least the need for IV iron can be reduced. Because low iron usually has a cause, finding and treating that cause is the best prevention. That might mean managing heavy periods, checking for and treating coeliac disease, reviewing medicines that cause stomach bleeding, or paying attention to iron in your diet. If you are pregnant, on dialysis, or have a condition that causes ongoing blood loss, your team will check your iron levels regularly so treatment can start early.

Vaccines

There is no vaccine for iron deficiency. Keeping up to date with your routine vaccinations is still worthwhile, as infections can make tiredness worse and slow your recovery.

Screening programmes

Routine blood tests check for anaemia during pregnancy and for people with kidney disease, and your GP can test your iron levels at any time if you have symptoms. If you have heavy periods, a family history of anaemia, or a long-term gut condition, ask your doctor whether regular blood checks would be sensible for you.

Complications

If left untreated

• Anaemia that gradually gets worse, with increasing tiredness and breathlessness
• Strain on the heart, which can worsen existing heart or lung problems
• Difficulties at work, at school or with everyday tasks
• In pregnancy, a higher chance of problems for mother and baby
• In children, slower growth and development, and difficulties with learning
• A greater chance of needing a blood transfusion
• Continued bleeding going undetected, which is why the cause always needs checking

Long-term outlook

The outlook is very good. IV iron is an effective, well-established treatment, and most people see a real improvement in their energy within a few weeks, with full benefit over a couple of months. The important next step is finding out why your iron ran low, so it can be treated and the problem does not come back. Many people need follow-up blood tests and occasional top-ups, and that is a normal part of managing a long-term cause. With treatment and a little patience, most people get back to feeling like themselves again.

Find support

External links open third-party websites. Ruqelo Health is not responsible for external content. Listing an organisation does not imply endorsement.