Gastrointestinal
Ursodeoxycholic acid
A bile acid (UDCA) — A natural bile acid that protects the liver in primary biliary cholangitis and treats some other bile problems.
Education and reference only. This is a plain-language class overview — it deliberately contains no doses. Always check the current Summary of Product Characteristics (SmPC), the BNF and your local formulary before prescribing or administering any medicine.
Quick answer
What is Ursodeoxycholic acid?
Ursodeoxycholic acid is a naturally occurring bile acid taken as a tablet to protect the liver and improve bile flow. Its main use is in primary biliary cholangitis, and it is also used in cholestasis of pregnancy and to dissolve some cholesterol gallstones.
- How it works: It shifts the mix of bile acids towards a gentler, less toxic form and improves the flow of bile, which protects liver cells from damage by harsher bile acids and reduces the build-up that causes itch and harm.
- In practice: In practice ursodeoxycholic acid (UDCA) is a naturally occurring bile acid given as a tablet, and its main, well-established use is as first-line treatment for primary biliary cholangitis (PBC) — a long-term autoimmune liver condition — where it improves liver blood tests, slows progression and can delay the need for transplant, so it is usually taken long-term for life with monitoring of liver function to judge response.
What it is
Ursodeoxycholic acid is a naturally occurring bile acid taken as a tablet to protect the liver and improve bile flow. Its main use is in primary biliary cholangitis, and it is also used in cholestasis of pregnancy and to dissolve some cholesterol gallstones.
How it works
It shifts the mix of bile acids towards a gentler, less toxic form and improves the flow of bile, which protects liver cells from damage by harsher bile acids and reduces the build-up that causes itch and harm. In gallstones, it lowers the cholesterol saturation of bile so certain cholesterol stones can slowly dissolve.
In practice
In practice ursodeoxycholic acid (UDCA) is a naturally occurring bile acid given as a tablet, and its main, well-established use is as first-line treatment for primary biliary cholangitis (PBC) — a long-term autoimmune liver condition — where it improves liver blood tests, slows progression and can delay the need for transplant, so it is usually taken long-term for life with monitoring of liver function to judge response. It is also used to treat the itch and protect the liver in cholestasis of pregnancy (intrahepatic cholestasis of pregnancy) under specialist obstetric care, to dissolve certain small cholesterol gallstones in selected people who cannot have surgery (a slow process that often recurs), and to help prevent gallstones during rapid weight loss. It is generally very well tolerated, with diarrhoea being the most common side effect. A practical point is that bile-acid sequestrants and some antacids bind it in the gut and reduce its absorption, so doses are separated. It is not suitable for all liver or gallbladder problems, and its benefit in PBC is judged on the response of liver tests over time, with newer add-on options for those who respond inadequately.
Examples
Practical use
How to take it & use it well
- Take it as prescribed, usually with or after food, as it is a natural bile acid that helps protect the liver and improve the flow of bile.
- Keep taking it long term and do not stop on your own, as in liver conditions like primary biliary cholangitis it is a steady treatment taken for years.
- Have your liver blood tests as arranged, as these show how well you are responding and guide whether the treatment is doing its job.
- If you are taking it to dissolve gallstones, understand this works slowly over many months and the stones can come back after stopping.
- If you are prescribed it in pregnancy for itching from cholestasis, take it under specialist guidance and attend the extra checks that come with it.
- Space it apart in time from antacids or any bile-binding medicines, as taking them together stops it being properly absorbed.
Common uses
- Primary biliary cholangitis (first-line, long-term)
- Cholestasis of pregnancy (specialist)
- Dissolving some cholesterol gallstones; prevention during rapid weight loss
Monitoring
- Liver function tests to assess response (especially in PBC)
- Symptoms (itch) and, in pregnancy, specialist obstetric monitoring
- Spacing from interacting binders/antacids
Weighing it up
Advantages & disadvantages
Advantages
- It is the main first-line, long-term treatment for primary biliary cholangitis and can slow the disease.
- It is generally well tolerated, with diarrhoea being the most common bother.
- It can ease the itching of cholestasis in pregnancy when used under specialist care.
- It can slowly dissolve certain cholesterol gallstones without surgery in suitable people.
- It works with the body's own bile system rather than against it, as it is a natural bile acid.
Disadvantages
- It often needs to be taken for years, requiring commitment to long-term treatment.
- Diarrhoea and other mild tummy upset are the most common side effects.
- When used for gallstones it works slowly and the stones can return after it is stopped.
- It does not suit every type of gallstone, only certain cholesterol ones.
- Its absorption is reduced by antacids and bile-binding medicines unless they are spaced apart.
Key safety principles
What to watch for
- Usually taken long-term in primary biliary cholangitis, with liver-function monitoring to judge response.
- Generally well tolerated; diarrhoea is the most common effect.
- Bile-acid sequestrants and some antacids reduce its absorption — separate the doses; not suitable for all liver/gallbladder problems.
Key interactions
What to avoid or check alongside
- Bile-binding medicines such as colestyramine bind it in the gut and stop it working, so take them several hours apart.
- Antacids that contain aluminium can also reduce its absorption, so they too should be spaced apart from it.
- It is used alongside the usual monitoring of liver blood tests, which guide whether it is working in liver conditions.
- In pregnancy it is used under specialist guidance for itching from cholestasis, with extra checks of the baby and your liver.
- Tell your team about all your medicines, as good timing matters most when other treatments could block its absorption.
Patient & carer advice
- In primary biliary cholangitis this is usually taken long-term — keep up your liver blood tests
- Leave a gap between this and any cholesterol-binding powders or indigestion remedies
- Tell us if you are or might be pregnant, as it is used differently then and needs specialist care
Use with
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Answers
Ursodeoxycholic acid: frequently asked questions
What is ursodeoxycholic acid used for?
It is a natural bile acid used mainly as the long-term, first-line treatment for primary biliary cholangitis, where it protects the liver and can slow the condition. It is also used for itching in cholestasis of pregnancy under specialist care, and to slowly dissolve certain cholesterol gallstones in suitable people.
How long will I need to take it?
For liver conditions such as primary biliary cholangitis, it is usually taken for years as a steady, ongoing treatment, with regular liver blood tests to check it is working. For dissolving gallstones it is taken over many months. Do not stop on your own, as the benefit depends on taking it consistently.
Why are my liver tests checked on this medicine?
In conditions like primary biliary cholangitis, your liver blood tests show how well you are responding to the treatment. They guide whether it is doing its job and whether anything else is needed. Keeping to these tests is an important part of managing your liver condition safely over the long term.
Can it really dissolve gallstones?
It can slowly dissolve certain cholesterol gallstones in suitable people, but it works gradually over many months and only suits some stone types, not all. The stones can also come back after the treatment is stopped. Your team will advise whether it is a sensible option for your particular gallstones.
Does it interact with my other medicines?
Its main issue is timing. Bile-binding medicines such as colestyramine, and some antacids, bind it in the gut and stop it being absorbed, so they should be taken several hours apart from it. Tell your team about all your medicines so they can advise on spacing them correctly.
Authoritative sources
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