An oral powder that lowers high potassium
Patiromer
An oral medicine used to lower high potassium levels in the blood by binding potassium in the gut.
What is Patiromer?
Patiromer is a medicine used to treat high potassium in the blood (hyperkalaemia), a problem that is common in people with kidney disease or heart failure and can affect the heart's rhythm. It works in the gut by binding to potassium so that it is passed out in the stool instead of being absorbed, which lowers the potassium level in the blood. It is taken by mouth as a powder mixed with water. Because it can bind other medicines too, it should be separated from them by a few hours. Potassium and other minerals are checked with blood tests.
Education and reference only. This is a plain-language guide to Patiromer — 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
Patiromer is a medicine used to lower high potassium levels in the blood, a condition called hyperkalaemia. High potassium is common in people with chronic kidney disease or heart failure, particularly those taking certain blood-pressure or heart medicines, and matters because it can disturb the heart's rhythm. Patiromer is taken by mouth as a powder that is mixed with water and swallowed. It works inside the gut rather than being absorbed into the body, and it is used to bring potassium down and keep it under control, under medical supervision with regular blood tests.
How it works
Potassium from food is normally absorbed from the gut into the blood. Patiromer is a binder that stays in the gut and grabs hold of potassium there, so instead of being absorbed it is carried out of the body in the stool. By reducing how much potassium enters the blood, it lowers a high potassium level and helps keep it in a safer range. Because it works in the gut and is not absorbed, its effect builds up over a little time rather than instantly, and it is taken regularly to keep potassium controlled. Lowering potassium too far is possible, so levels are monitored.
Company & origin
Originated / developed by: Specialist manufacturer.
A medicine used in the UK to treat high potassium levels in the blood, taken by mouth as a powder mixed with water.
Practical use
How to take Patiromer
General, dose-free guidance — always follow your prescriber's and the leaflet's specific instructions.
- Mix the powder with water (not hot liquids) and stir well before drinking, taking it as your team advises.
- Separate it from your other medicines by a few hours, as it can bind them and stop them being absorbed.
- Take it regularly as prescribed, since it works gradually to keep potassium under control.
- Go for your blood tests so potassium and magnesium can be checked.
- Tell your team about any constipation or other tummy upset, especially when starting.
Weighing it up
Advantages & disadvantages of Patiromer
Advantages
- Lowers high potassium in the blood and helps keep it under control over time.
- Taken by mouth and works in the gut without being absorbed into the body.
- Can allow some people to keep taking important heart or kidney medicines that raise potassium.
Disadvantages
- Must be separated from other medicines by a few hours to avoid binding them.
- Works gradually, so it is not for sudden emergency lowering of potassium.
- Can cause constipation or tummy upset and can lower potassium or magnesium too much.
Practical use
Good to know
The most important practical point with patiromer is timing: because it can bind to other medicines in the gut and stop them being absorbed, it should be taken separated from other medicines by a few hours, as advised. It is taken by mouth as a powder mixed with water (not hot liquids) and stirred well before drinking. It works gradually rather than instantly, so it is generally used for ongoing control rather than a sudden emergency. Because it lowers potassium, there is a chance of potassium going too low, and it can also affect magnesium, so regular blood tests are used to keep the balance right. Constipation or other tummy upset can occur, especially at first. Tell your team about all your other medicines so the timing can be planned.
Who should not take it / use with caution
- People who have had a serious allergic reaction to patiromer should not take it.
- It is used with caution in people with serious bowel problems or who cannot swallow it safely.
- It should be used under medical supervision with regular blood tests for potassium and magnesium.
Monitoring
- Regular blood tests to check potassium is in the right range and not too low.
- Checking magnesium levels, which patiromer can lower.
- Reviewing bowel symptoms and how well potassium is controlled.
Side effects
- Constipation, diarrhoea, wind or tummy discomfort, especially early on.
- Low magnesium, which is why blood tests check minerals.
- Potassium falling too low if the balance is not watched.
Key interactions
- It can bind many other medicines in the gut, so they must be separated by a few hours.
- It can lower magnesium, so other things that affect minerals may need review.
- Tell your team about all your medicines so the timing can be planned safely.
Available as: A powder taken by mouth, mixed with water before drinking.
Answers
Patiromer: frequently asked questions
What is patiromer used for?
It is used to treat high potassium in the blood (hyperkalaemia) by binding potassium in the gut so it is passed out instead of absorbed.
Why must I keep it apart from other medicines?
It can bind to other medicines in the gut and stop them being absorbed, so it should be separated from them by a few hours.
Can it lower potassium too much?
Yes, potassium can fall too low, and it can also lower magnesium, which is why regular blood tests are used to keep the balance right.
Is it used in an emergency?
No. It works gradually, so it is mainly used for ongoing control of potassium rather than for sudden emergency lowering.
How is it taken?
It is taken by mouth as a powder mixed with water (not hot liquids) and stirred well before drinking.
The wider class
About Potassium binder (for high potassium)
Patiromer belongs to the potassium binder (for high potassium) 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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