Digoxin-binding antibody fragments (DigiFab) for digoxin poisoning
Digoxin-specific antibody
Digoxin-binding antibody fragments used in hospital to reverse life-threatening digoxin (and digitoxin) poisoning.
What is Digoxin-specific antibody?
Digoxin-specific antibody is an emergency antidote made of antibody fragments that bind digoxin (and the related drug digitoxin) to reverse life-threatening poisoning, given by injection into a vein. It works quickly to mop up digoxin so its dangerous effects on the heart settle. Because it rapidly removes digoxin's effect, the heart rhythm and blood potassium must be watched closely, and removing digoxin can unmask the heart problems it was treating, such as heart failure or a fast, irregular heartbeat (atrial fibrillation). It is used only in hospital by trained staff in serious digoxin poisoning.
Education and reference only. This is a plain-language guide to Digoxin-specific antibody — 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
Digoxin-specific antibody consists of fragments of antibodies that specifically grab hold of digoxin, a heart medicine that can become dangerous in overdose or when levels build up too high. It is used as an emergency antidote in serious or life-threatening digoxin poisoning, and it also works against the closely related drug digitoxin. It is given as an injection into a vein in hospital. By binding digoxin and allowing it to be removed, it reverses the drug's harmful effects on the heart. It is used only by trained healthcare staff in a monitored setting, in cases judged severe enough to need it.
How it works
Digoxin works on the heart by changing how heart cells handle certain minerals, and in overdose this can cause dangerous heart-rhythm disturbances and a rise in blood potassium. The antibody fragments bind tightly to digoxin in the blood, pulling it away from the heart and forming a compound that the body removes in the urine. As digoxin's effect is reversed, the heart rhythm can stabilise and potassium levels can fall. Because this reversal happens quickly, potassium and heart rhythm are watched closely, and the conditions digoxin was originally treating may reappear.
Company & origin
Originated / developed by: Specialist manufacturer.
An emergency antidote used in UK hospitals to reverse life-threatening poisoning with digoxin or digitoxin.
Practical use
How to take Digoxin-specific antibody
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- It is given by trained hospital staff as an injection into a vein, not something you take yourself.
- It is used in serious or life-threatening digoxin (or digitoxin) poisoning, judged severe enough to need it.
- Blood potassium and the heart rhythm are watched closely, as reversing digoxin can change both quickly.
- The team is ready to manage the return of conditions digoxin was treating, such as heart failure or atrial fibrillation.
- Tell staff about any previous allergic reactions, as rare allergic reactions can occur.
Weighing it up
Advantages & disadvantages of Digoxin-specific antibody
Advantages
- Rapidly reverses life-threatening digoxin (and digitoxin) poisoning when other measures are not enough.
- Binds digoxin so its dangerous effects on the heart and potassium can settle.
- A targeted antidote used by experienced hospital teams in emergencies.
Disadvantages
- Rapidly removing digoxin can cause blood potassium to fall and the heart rhythm to change quickly.
- Can unmask the conditions digoxin was treating, such as heart failure or atrial fibrillation.
- An emergency hospital-only treatment, with a small risk of allergic reactions.
Practical use
Good to know
The key things to understand are that this antidote acts quickly and that reversing digoxin has knock-on effects that must be managed. As it removes digoxin's action, blood potassium can fall (sometimes sharply), so potassium is monitored and corrected, and the heart rhythm is watched closely. Importantly, taking away digoxin can unmask the very problems it was controlling, such as worsening heart failure or the return of a fast, irregular heartbeat (atrial fibrillation), so the team is ready to manage these. It is used in serious or life-threatening poisoning, including dangerous heart-rhythm problems or very high digoxin levels, and it also works for digitoxin. It is an emergency hospital treatment, given by trained staff who monitor the heart and blood tests throughout, with watchfulness for rare allergic reactions.
Who should not take it / use with caution
- People who have had a serious allergic reaction to the antibody fragments should be treated with particular caution.
- It is used carefully in people who genuinely need digoxin's effect, as removing it can worsen their heart condition.
- It is used only in hospital by trained staff with heart and blood monitoring.
Monitoring
- Close monitoring of the heart rhythm during and after treatment.
- Checking blood potassium, which can fall quickly as digoxin is reversed.
- Watching for the return of heart failure or atrial fibrillation, and for any allergic reactions.
Side effects
- A fall in blood potassium as digoxin's effect is reversed, which is monitored and corrected.
- The return or worsening of conditions digoxin was treating, such as heart failure or atrial fibrillation.
- Rarely, allergic-type reactions, which need immediate management.
Key interactions
- It removes the effect of digoxin and digitoxin, so the heart condition these were treating may reappear.
- Standard blood tests for digoxin become unreliable after it is given, so labs should know it has been used.
- It is used alongside other emergency support, managed together by the hospital team.
Available as: A powder made up into a solution for injection into a vein, given in hospital.
Answers
Digoxin-specific antibody: frequently asked questions
What is digoxin-specific antibody used for?
It is an emergency antidote used in hospital to reverse life-threatening poisoning with digoxin, and the related drug digitoxin, by binding the drug so it can be removed.
How quickly does it work?
It works quickly to bind digoxin and reverse its dangerous effects on the heart, which is why potassium and heart rhythm are watched closely as it takes effect.
Why does my potassium need watching?
Reversing digoxin can make blood potassium fall, sometimes sharply, so potassium is monitored and corrected during treatment.
Can it cause my heart problem to come back?
Yes. Removing digoxin can unmask the conditions it was treating, such as heart failure or a fast, irregular heartbeat, so the team is ready to manage these.
How is it given?
It is given as an injection into a vein in hospital by trained staff who monitor the heart and blood tests throughout.
Authoritative sources
- BNF
- NICE CKS
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