UDCA Dosage Calculator
Calculate your appropriate Ursodeoxycholic Acid dosage based on your weight and liver condition. Always consult your physician before starting or adjusting medication.
Living with a liver condition can feel overwhelming-fatigue, itching, and confusing lab results quickly become part of daily life. One medication that often slips under the radar is Ursodeoxycholic Acid a naturally occurring bile acid used to improve bile flow and protect liver cells. When taken correctly, it can ease symptoms, slow disease progression, and in some cases, replace the need for more aggressive interventions. In this guide we’ll walk through what the drug does, who benefits most, how to use it safely, and what to watch for along the way.
What the drug actually is
Ursodeoxycholic acid (often shortened to UDCA or sold under the brand name Ursodiol the commercial formulation of UDCA approved for several liver disorders) is a hydrophilic bile acid a water‑soluble bile acid that is less toxic to liver cells than the body’s own primary bile acids. It works by diluting the pool of more aggressive bile acids, encouraging healthier bile flow, and reducing inflammation around the bile ducts.
Which liver diseases respond best
Not every liver problem is a good match for UDCA. The evidence is strongest for a handful of cholestatic conditions-those where bile can’t move freely. Here’s a quick snapshot:
- Primary biliary cholangitis an autoimmune disease that attacks the small bile ducts, leading to progressive scarring
- Gallstone disease when cholesterol crystals form stones that block the bile ducts
- Intrahepatic cholestasis of pregnancy a pregnancy‑specific form of bile buildup that can harm the baby if untreated
- Primary sclerosing cholangitis a progressive scarring of both intra‑ and extra‑hepatic bile ducts, often linked to ulcerative colitis
For other liver ailments-like viral hepatitis or alcoholic liver disease-UDCA’s role is far more limited and usually combined with other therapies.
How it works on a molecular level
UDCA has three main actions that add up to a protective effect:
- Detoxification: It replaces toxic bile acids (like deoxycholic acid) with a gentler alternative, reducing cell‑death signals.
- Choleresis: It stimulates the liver’s bile‑salt export pump, helping bile flow out of the liver more efficiently.
- Anti‑inflammatory signaling: By activating the FXR receptor a nuclear receptor that regulates bile‑acid synthesis and inflammation, UDCA dampens the inflammatory cascade that fuels fibrosis.
Because these actions are gentle, the drug is generally well‑tolerated compared to stronger agents that target the same pathways.

Dosage guidelines and how to take it right
Getting the dose right is crucial. Most clinicians start patients at 13-15 mg per kilogram of body weight per day, split into two doses. For an average adult weighing 70 kg, that works out to about 1 g twice daily. Here’s a step‑by‑step approach:
- Ask your doctor for a prescription specifying the exact milligram amount per tablet.
- Take the dose with food. A light snack or a glass of milk can help reduce stomach upset.
- Set a daily reminder-consistency matters because the drug builds up slowly in the liver.
- Schedule liver‑function tests every 3-6 months. The labs (ALT, AST, ALP, bilirubin) will tell you if the medication is doing its job.
- If you miss a dose, take it as soon as you remember, unless it’s almost time for the next dose. In that case, skip the missed one-don’t double‑dose.
Kidney or liver impairment may require dose reductions. Always let your provider know about any new medications, especially over‑the‑counter drugs that can interfere with bile‑acid metabolism.
Potential side effects and red flags
Most people only notice mild gastrointestinal symptoms-maybe a bit of diarrhea or nausea that settles after a week. Rare but serious issues include:
- Persistent itching that worsens despite antihistamines.
- Elevated liver enzymes that keep climbing after three months of therapy.
- Unexplained yellowing of the skin or eyes (jaundice).
If any of these appear, contact your liver specialist right away. Stopping UDCA abruptly isn’t usually dangerous, but a sudden change can confuse lab trends, so a coordinated taper is best.
Living with UDCA: lifestyle tips that amplify results
A medication works best when paired with healthy habits. Here are three low‑effort strategies that sync nicely with UDCA therapy:
- Stay hydrated: Adequate water helps bile stay fluid, easing the job of the drug.
- Choose low‑fat meals: Heavy, greasy foods increase bile production and can overload a compromised system.
- Exercise regularly: Even a 30‑minute walk three times a week boosts circulation to the liver and can improve lab numbers.
These tweaks don’t replace medical care, but they can shave weeks off symptom flare‑ups and keep you feeling steadier.

When UDCA isn’t enough: next‑line options
If disease progression continues despite optimal dosing, doctors may consider additional agents. The most common add‑ons are:
- Obeticholic acid a potent FXR agonist approved for primary biliary cholangitis when UDCA response is inadequate
- Corticosteroids used mainly in autoimmune hepatitis to curb inflammation
- Liver transplantation the definitive treatment for end‑stage liver failure when medical therapy fails
Each comes with its own risk profile, so they’re typically reserved for patients who fail to meet UDCA response criteria (e.g., less than 40 % drop in alkaline phosphatase after one year).
Comparing UDCA with other therapies
Attribute | Ursodeoxycholic Acid | Obeticholic Acid | Corticosteroids |
---|---|---|---|
Mechanism | Hydrophilic bile‑acid replacement, improves cholestasis | Potent FXR agonist, reduces bile‑acid synthesis | Broad anti‑inflammatory, suppresses immune response |
Primary Indication | Primary biliary cholangitis, gallstone dissolution | UDCA‑non‑responders with PBC | Autoimmune hepatitis, severe inflammation |
Typical Dose | 13-15 mg/kg/day (split BID) | 5-10 mg/day (once daily) | Prednisone 30 mg/day tapering schedule |
Common Side Effects | Diarrhea, nausea, mild hair loss | Itching, elevated LDL, abdominal pain | Weight gain, osteoporosis, glucose intolerance |
FDA Status (US) | Approved (generic & brand) | Approved (Ocaliva) | Approved (various steroids) |
Seeing the side‑by‑side data helps you weigh whether UDCA alone is enough or if a combination approach makes sense.
Frequently asked questions
Can I take UDCA if I’m pregnant?
Yes, UDCA is the first‑line treatment for intrahepatic cholestasis of pregnancy. Doctors usually prescribe 10-15 mg/kg/day because it improves bile flow and reduces fetal risk.
How long before I see results?
Most patients notice a drop in itching and a modest improvement in liver enzymes within 8-12 weeks. Full biochemical response can take up to a year.
Is UDCA safe for people with kidney disease?
Generally yes, because the drug is cleared mainly by the liver. However, dose adjustments may be needed if severe renal impairment exists, so discuss it with your nephrologist.
Can I buy UDCA over the internet?
Only reputable online pharmacies that require a prescription should be used. Counterfeit pills are a real risk, and they won’t provide the therapeutic benefit you need.
What should I do if my labs keep rising?
Schedule a follow‑up with your hepatologist. They might increase the dose, add a second‑line agent, or order imaging to rule out biliary obstruction.
Those answers cover the most common concerns, but every liver condition is unique. Keep an open line with your care team, track symptoms, and stay on top of lab appointments-those are the real keys to making UDCA work for you.
Thank you for posting such a comprehensive overview of ursodeoxycholic acid. Your guide walks the reader through each step with clarity that is both reassuring and actionable. The way you highlighted dosage and lifestyle tips feels like a coach gently steering a patient toward better health. I appreciate the balance of scientific detail and practical advice.