Haematological system

Blood: medicines & conditions

Blood carries oxygen, fights infection and forms clots to stop bleeding. Haematology medicines correct shortages (such as iron or vitamin deficiency), support the bone marrow, and manage clotting and bleeding.

Education and reference only. This hub explains which medicines relate to the blood and why — it deliberately contains no doses and is not a substitute for advice from your doctor or pharmacist. Always check the BNF and the product labelling for prescribing detail.

About the blood

This group includes iron and vitamin replacement for anaemia, drugs that stimulate the bone marrow, treatments that manage clotting, and specialist medicines for blood disorders. Some are simple supplements taken at home; others are specialist treatments needing close monitoring with blood tests. The themes that matter are taking replacement treatment correctly (and long enough to work), keeping to monitoring schedules, and understanding what the blood counts are showing.

What this covers

Iron-deficiency and other anaemias
Vitamin replacement for the blood
Clotting and bleeding disorders
Bone-marrow support

Conditions in this area

Blood conditions (29)

Each links to a dose-free guide showing which medicine classes are used and how treatment is approached.

Blood Acute lymphoblastic leukaemia A fast-developing blood cancer of white blood cells, most common in children — where prompt diagnosis and intensive trea… Blood Acute myeloid leukaemia A fast-developing blood cancer of myeloid cells, more common in older adults — needing prompt, intensive treatment, wher… Blood Antiphospholipid syndrome An immune condition that makes the blood more likely to clot, causing thromboses and pregnancy complications — managed w… Blood Aplastic anaemia A rare condition where the bone marrow stops making enough blood cells, causing anaemia, infections and bleeding — treat… Blood Chronic lymphocytic leukaemia A slow-developing blood cancer of white blood cells, common in older adults — often causing no symptoms at first and som… Blood Chronic myeloid leukaemia A slow-developing blood cancer of myeloid cells, now often well-controlled long-term with targeted tablet treatments — w… Blood Erythrocytosis A raised number of red blood cells, which thickens the blood — where the cause guides treatment, as it can be a response… Blood Essential thrombocythaemia A blood condition where the bone marrow makes too many platelets, which can raise the risk of clots or bleeding — usuall… Blood Factor V Leiden A common inherited change that makes the blood slightly more likely to clot — most people never have problems, but it ra… Blood Folate deficiency A lack of folate (vitamin B9), which can cause anaemia and tiredness — usually from diet or increased needs, and easily … Blood G6PD deficiency A common inherited enzyme deficiency that can cause the red blood cells to break down in response to certain triggers — … Blood Haemolytic anaemia Anaemia caused by red blood cells being destroyed faster than they can be replaced — with many possible causes, treated … Blood Haemophilia An inherited bleeding disorder in which the blood does not clot properly due to a missing clotting factor, causing prolo… Blood Hereditary spherocytosis An inherited condition where red blood cells are more fragile and break down early, causing anaemia, jaundice and an enl… Blood High platelet count (thrombocytosis) A higher-than-normal number of platelets in the blood, usually a reaction to another condition (such as infection or inf… Blood Iron deficiency anaemia Anaemia caused by a shortage of iron, leading to too little haemoglobin and symptoms such as tiredness, paleness and bre… Blood MGUS (monoclonal gammopathy) A common, usually harmless finding of an abnormal protein in the blood — needing monitoring, as a small proportion of pe… Blood Myelodysplastic syndrome (MDS) A group of conditions where the bone marrow does not make enough healthy blood cells — ranging from mild to serious, and… Blood Myelofibrosis A rare bone marrow condition where scar tissue builds up in the marrow, affecting blood cell production — causing anaemi… Blood Myeloma A cancer of plasma cells in the bone marrow that can cause bone pain, fractures, anaemia, kidney problems and raised cal… Blood Neutropenia A low level of neutrophils (infection-fighting white cells), which raises the risk of infections — with many causes, and… Blood Pernicious anaemia A type of vitamin B12 deficiency caused by the body being unable to absorb B12, leading to anaemia and nerve symptoms — … Blood Polycythaemia A condition where the blood becomes thicker due to too many red blood cells, raising the risk of clots — managed to redu… Blood Raised eosinophils (eosinophilia) A higher-than-normal number of a type of white blood cell, often linked to allergies, asthma or parasitic infections — u… Blood Raised lymphocytes (lymphocytosis) A higher-than-normal number of a type of white blood cell, most often a normal response to infection — usually temporary… Blood Sickle cell disease An inherited blood disorder in which red blood cells become rigid and sickle-shaped and break down, causing anaemia and … Blood Thalassaemia An inherited blood disorder affecting the production of haemoglobin, causing anaemia — ranging from mild to severe, with… Blood Thrombocytopenia A low platelet count — platelets help the blood to clot, so a low level can cause easy bruising, tiny pinpoint spots (pe… Blood Von Willebrand disease The most common inherited bleeding disorder, where the blood does not clot properly, causing easy bruising and prolonged…

Medicine classes

Medicines for the blood (10)

Each links to a full, dose-free guide — what it is, how it works, who can and cannot use it, side effects, interactions and FAQs.

Anticoagulant reversal agents Haematology Specialist agents used to reverse blood-thinners in serious bleeding or before urgent surgery.… Erythropoiesis-stimulating agents Haematology Boost red-cell production in anaemia of kidney disease and some other settings.… Folic acid Haematology Prevents and treats folate deficiency — and protects against neural-tube defects in pregnancy.… G-CSF (growth factors) Haematology Injections that prompt the bone marrow to make more infection-fighting white cells (neutrophils).… Heparins Haematology Injectable blood-thinners used to prevent and treat clots, including in hospital and pregnancy.… Hydroxycarbamide Haematology A long-term tablet that reduces painful crises in sickle cell disease and controls overactive blood production… Intravenous iron Haematology Iron given by drip to correct iron deficiency quickly when tablets are not enough or not tolerated.… Oral iron Haematology First-line treatment for iron-deficiency anaemia — effective but often poorly tolerated.… Tranexamic acid Haematology Reduces heavy bleeding — widely used for heavy periods, surgery and trauma.… Vitamin B12 Haematology Replaces vitamin B12 in deficiency — by injection in pernicious anaemia and absorption problems.…

By active ingredient

Common blood medicines by name

Individual, dose-free guides to specific active ingredients (and their brands) in this area:

Answers

Blood: frequently asked questions

What medicines are used for the blood?

This system includes 10 medicine classes — such as anticoagulant reversal agents, erythropoiesis-stimulating agents, folic acid, g-csf (growth factors). Each links to a full, dose-free guide covering what it is, how it works, who can and cannot use it, side effects and interactions.

Which conditions affect the blood?

Common conditions in this area include Acute lymphoblastic leukaemia, Acute myeloid leukaemia, Antiphospholipid syndrome, Aplastic anaemia, Chronic lymphocytic leukaemia and more. Each condition page shows the medicine classes used to treat it and why.

Do these pages give doses?

No. Every page on this site is dose-free. We explain which medicines are used and why, but doses depend on the individual and the exact product — always confirm with your prescriber, the BNF and the product labelling.

Is this a substitute for medical advice?

No — it is education and reference only. It helps you understand this body system and its treatments, but decisions about your own care should always be made with a qualified clinician.

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