A clotting-factor concentrate used to reverse warfarin
Prothrombin complex concentrate
A concentrate of several clotting factors used to quickly reverse warfarin and treat serious bleeding, given with vitamin K.
What is Prothrombin complex concentrate?
Prothrombin complex concentrate is a medicine containing several of the clotting factors that warfarin lowers. It is used to rapidly reverse warfarin's blood-thinning effect when someone is bleeding seriously or needs urgent surgery. It is given into a vein and works quickly. Because it restores clotting, there is a risk of unwanted clots (thrombosis), so it is used carefully, and when reversing warfarin it is given together with vitamin K, which provides longer-lasting reversal. It is made from human blood plasma, so it carries the usual precautions of a plasma-derived product.
Education and reference only. This is a plain-language guide to Prothrombin complex concentrate — it deliberately contains no doses. Doses depend on the person, the brand and the reason for treatment, and belong with your prescriber. Always check the BNF, the product labelling (SmPC) and follow medical advice.
What it is
Prothrombin complex concentrate is a medicine made up of several clotting factors, the proteins the blood needs to clot, which are the very ones reduced by the blood thinner warfarin. It is used mainly to quickly reverse warfarin when there is serious or life-threatening bleeding, or when a person on warfarin needs emergency surgery. It is given into a vein and acts fast, which is why it is preferred over slower options in an emergency. It is prepared from human blood plasma and is used and supervised by hospital and haematology teams.
How it works
Warfarin works by lowering the levels of certain clotting factors, which thins the blood. Prothrombin complex concentrate directly tops up those same clotting factors, so the blood can clot again quickly, reversing warfarin's effect within a short time. Because the concentrate's effect wears off as the factors are used up, while warfarin keeps acting for longer, vitamin K is given at the same time to help the body make its own clotting factors and provide more lasting reversal. Restoring clotting carries a risk of unwanted clots, so the concentrate is dosed carefully and reserved for situations where rapid reversal is genuinely needed.
Company & origin
Originated / developed by: Specialist manufacturer.
A specialist blood-derived medicine used in the UK to rapidly reverse the blood-thinning effect of warfarin and treat serious bleeding.
Practical use
How to take Prothrombin complex concentrate
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- It is given as an injection or drip into a vein by a hospital team in an emergency.
- When used to reverse warfarin, it is given together with vitamin K for longer-lasting reversal.
- The dose is calculated carefully by the team to balance reversing bleeding against the risk of clots.
- Tell the team about any history of clots, heart disease or stroke, as these affect the decision.
- It is an emergency hospital treatment, not a medicine taken at home.
Weighing it up
Advantages & disadvantages of Prothrombin complex concentrate
Advantages
- Reverses warfarin quickly, which is vital in serious bleeding or before emergency surgery.
- Works faster than giving vitamin K or plasma alone.
- Replaces the exact clotting factors that warfarin lowers.
Disadvantages
- Restoring clotting carries a risk of unwanted clots (thrombosis).
- Gives fast but short-lived reversal, so vitamin K is needed alongside for warfarin.
- Made from human blood plasma, so it carries the usual precautions of a blood product.
Practical use
Good to know
The main role of prothrombin complex concentrate is rapid reversal of warfarin in serious bleeding or before emergency surgery, and the most important safety point is the risk of unwanted clots: because it restores clotting quickly, it can tip the balance towards thrombosis, so it is used only when truly needed and at a carefully chosen dose. When it is used to reverse warfarin, it is given together with vitamin K, because the concentrate gives fast but short-lived reversal while vitamin K provides slower, longer-lasting cover; using only one would leave a gap. It is made from human blood plasma, so it carries the standard, carefully managed precautions of a plasma-derived product. It is given into a vein by hospital teams, with monitoring of clotting and for any signs of clots forming.
Who should not take it / use with caution
- People who have had a serious allergic reaction to it or its components should not be given it.
- It is used with great caution in people at high risk of clots, such as recent heart attack or clotting disorders.
- It is used only by hospital teams in situations where rapid reversal is genuinely needed.
Monitoring
- Clotting blood tests before and after treatment to judge the reversal.
- Watching for signs of unwanted clots in the legs, lungs, heart or brain.
- Watching for allergic or infusion-related reactions.
Side effects
- Unwanted blood clots, such as in the legs, lungs, heart or brain.
- Allergic or hypersensitivity reactions during or after the infusion.
- Reactions related to the infusion, such as feeling unwell or a change in blood pressure.
Key interactions
- It is given with vitamin K when reversing warfarin, as the two work over different timeframes.
- Care is needed in people already at high clotting risk or on other clot-promoting treatments.
- The team takes account of all clotting and bleeding medicines when deciding to use it.
Available as: A powder made up into a solution and given as an injection or drip into a vein.
Answers
Prothrombin complex concentrate: frequently asked questions
What is prothrombin complex concentrate used for?
It is used to rapidly reverse the blood-thinning effect of warfarin when someone has serious bleeding or needs urgent surgery, by replacing the clotting factors that warfarin lowers.
Why is vitamin K given as well?
The concentrate gives fast but short-lived reversal, while vitamin K provides slower, longer-lasting reversal, so the two are used together to avoid the warfarin effect returning.
Can it cause clots?
Yes. Because it restores clotting quickly, there is a risk of unwanted clots, so it is used only when truly needed and at a carefully chosen dose.
Why does it matter that it comes from plasma?
It is made from human blood plasma, so it carries the standard, carefully managed precautions of a plasma-derived product.
Is it given at home?
No. It is an emergency treatment given into a vein by a hospital team, with monitoring of clotting and for signs of clots.
The wider class
About Clotting-factor concentrate (anticoagulant reversal)
Prothrombin complex concentrate belongs to the clotting-factor concentrate (anticoagulant reversal) class. For how the class as a whole works, its shared safety principles and monitoring, see the full guide.
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Authoritative sources
- BNF
- NICE CKS
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