Author: Revivera Medical Team · Last updated: 25 October 2026
Iron-deficiency anaemia, caused by a lack of iron, is the most common form of anaemia worldwide [1]. It is usually treated with oral iron, but in some situations supplements are not enough or are not tolerated. The doctor may then recommend intravenous iron, given as a drip. In this article you will find out how iron-deficiency anaemia is recognised, when IV iron is recommended, which blood tests are needed, how the drip works and what precautions apply.
What iron-deficiency anaemia is
Iron is needed to make haemoglobin, the protein in red blood cells that carries oxygen around the body. When iron stores run out, the body makes less haemoglobin and iron-deficiency anaemia develops [2].
The most common causes are [2] [3]:
- blood loss, for example heavy periods or bleeding in the digestive tract;
- not enough iron in the diet;
- reduced iron absorption, for example in coeliac disease, inflammatory bowel disease or after some stomach surgery;
- higher needs, for example during pregnancy.
How iron-deficiency anaemia is recognised
Symptoms come on gradually and are easy to mistake for ordinary tiredness [2] [3]:
- fatigue and lower exercise tolerance;
- pale skin;
- shortness of breath on exertion, palpitations;
- headaches, dizziness;
- brittle nails and hair loss.
The diagnosis is based on blood tests, not on symptoms alone.
Which blood tests are needed
Before any iron treatment, the doctor needs recent blood tests, which you bring to the consultation [2] [3]:
- a full blood count, which shows the haemoglobin level and the appearance of the red blood cells;
- ferritin, which reflects the body’s iron stores;
- serum iron and transferrin saturation.
It is just as important to find the cause of the iron deficiency. Iron treatment corrects the deficiency, but it does not replace investigating the cause, such as bleeding.
When oral supplements are not enough
Oral iron is usually the first option. IV iron is recommended when [3] [4]:
- oral iron is not tolerated, because of digestive side effects (nausea, constipation, abdominal pain);
- oral iron does not work, for example in intestinal absorption disorders;
- iron losses are greater than oral treatment can make up for;
- iron stores need to be replenished faster, on the doctor’s recommendation.
Iron injection or IV iron?
In everyday language, “iron injection” and “IV iron” usually mean the same thing: iron given directly “into the vein”. At Revivera, iron is given as an intravenous drip, slowly, under medical supervision.
How the iron drip works
- Medical consultation — the doctor reviews your blood tests and medical history and decides whether the drip is suitable.
- Administration — the drip is set up by medical staff and given slowly, over about 120 minutes, under the continuous supervision of a doctor.
- Monitoring — after the drip, you stay under observation for at least 30 minutes, in line with European Medicines Agency recommendations [5].
- Follow-up — the doctor sets the number of sessions, and the effect is checked with follow-up blood tests.
Precautions and possible reactions
IV iron is generally well tolerated. Hypersensitivity reactions are very rare but can be serious; this is why IV iron is given only where trained medical staff and emergency equipment are available [4] [5]. The risk is higher for people who have had a reaction to an iron drip before, people with multiple drug allergies or severe atopy, and when the infusion rate is too fast [4].
Other reactions are usually mild and temporary. The doctor explains them at the consultation, and the drip is supervised throughout.
Who cannot have an iron drip
- in anaemias not caused by iron deficiency;
- in iron overload (for example haemochromatosis);
- in case of a known allergy to iron preparations;
- during pregnancy.
Tell the doctor at the consultation if you have had allergic reactions, if you have an inflammatory disease or an active infection, and what medication you take.
The iron IV drip at Revivera
At Revivera Clinic, the iron drip is given after a free medical consultation, based on your blood tests, under the continuous supervision of a specialist doctor in intensive care (ATI) or emergency medicine. It takes 120 minutes, depending on each patient’s clinical course.
Find out more about the iron IV drip.
Frequently asked questions
When is IV iron recommended?
When oral iron is not tolerated or does not work, when iron losses are high, or when the doctor considers it necessary to replenish iron stores faster.
Which blood tests do I need beforehand?
Several blood tests are needed, the most important being: a full blood count, ferritin, serum iron and transferrin saturation. The doctor may also recommend tests to find the cause of the iron deficiency.
How many iron drips are needed?
The doctor sets the number of sessions, based on your blood tests and the extent of the iron deficiency.
How long does an iron drip take?
About 120 minutes, followed by at least 30 minutes of observation.
Is an iron drip dangerous?
Serious reactions are very rare. The drip is given slowly, under medical supervision, in a setting where a reaction can be treated immediately.
Can I have an iron drip during pregnancy?
At Revivera, we do not give the iron drip during pregnancy.
Scientific sources
- World Health Organization (2025). Anaemia (fact sheet). https://www.who.int/news-room/fact-sheets/detail/anaemia
- Camaschella C. (2015). Iron-Deficiency Anemia. New England Journal of Medicine. https://doi.org/10.1056/NEJMra1401038
- Pasricha S.R. et al. (2021). Iron deficiency. The Lancet. https://doi.org/10.1016/S0140-6736(20)32594-0
- Rampton D. et al. (2014). Hypersensitivity reactions to intravenous iron: guidance for risk minimization and management. Haematologica. https://pmc.ncbi.nlm.nih.gov/articles/PMC4222472/
- European Medicines Agency (2013). Intravenous iron-containing medicinal products (evaluarea riscului de reacții alergice). https://www.ema.europa.eu/en/medicines/human/referrals/intravenous-iron-containing-medicinal-products
