Ursa

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Ursa

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Medically reviewed

Marina Burgos

Last updated on 10/01/2026

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Ursa

What is Ursa?

Ursa is a therapeutic agent containing ursodeoxycholic acid, a naturally occurring bile acid found in small quantities in human bile. It is used primarily to treat conditions affecting the liver and gallbladder by modifying the composition and flow of bile.

Mechanism of Action

The active component in Ursa works through several physiological mechanisms:

  • Cholesterol Reduction: It reduces the amount of cholesterol secreted into the bile by inhibiting its absorption in the intestines and its synthesis in the liver.
  • Gallstone Dissolution: By decreasing the cholesterol saturation of bile, it facilitates the gradual dissolution of cholesterol-based gallstones.
  • Liver Protection: It replaces toxic, hydrophobic bile acids that can damage liver cells with hydrophilic bile acids, which are less irritating to the biliary system.
  • Bile Flow Promotion: It helps stimulate the flow of bile, which can be beneficial for individuals with chronic cholestatic liver diseases.

Primary Uses

Ursa is commonly utilized in the management of the following conditions:

  • Biliary Cirrhosis: It is used for the treatment of primary biliary cholangitis, a chronic disease where the bile ducts in the liver are slowly destroyed.
  • Gallstone Management: It is indicated for patients with radiolucent, non-calcified gallstones who are not candidates for surgery or who wish to avoid invasive procedures.
  • Hepatobiliary Disorders: It may be used in the treatment of various liver dysfunctions associated with impaired bile secretion.

What side effects are possible with Ursa?

Possible Side Effects and Safety Information

The safety profile of Ursa (Ursodeoxycholic Acid) is primarily defined by effects on the gastrointestinal system and specific restrictions related to biliary tract conditions. The classification of adverse reactions is based on official government regulatory documents.


Frequency-Classified Adverse Reactions

The most frequent adverse events are generally confined to the digestive tract. These are classified based on the standard regulatory frequency framework:

Classification Adverse Reaction(s)
Very Common Diarrhea, soft stools
Very Rare Calcification of gallstones, severe right upper abdominal pain, decompensation of hepatic cirrhosis, urticaria (hives)

Safety Patterns and Constraints

The label notes that diarrhea and soft stools may be more frequent at the start of treatment or during initial dose changes. In rare instances, symptoms such as pruritus (itching) may worsen temporarily in patients with Primary Biliary Cholangitis (PBC) at the start of therapy.

Safety is further defined by explicit contraindications that restrict its use. The medicine should not be used in individuals with acute inflammation of the gallbladder or biliary tract, occlusion of the biliary tract (e.g., cystic duct or common bile duct), or the presence of radio-opaque calcified gallstones.


Population and Serious Considerations

The official profile documents very rare but clinically significant adverse reactions, including the calcification of gallstones and the decompensation of hepatic cirrhosis, especially in patients with advanced PBC. For women of childbearing potential, reliable contraception must be used due to specific safety statements regarding pregnancy.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documents for Ursodeoxycholic Acid (Ursa) define the overdose profile based on documented manifestations and mandated emergency actions.

Documented Manifestations and Management

The most likely clinical manifestation of a severe overdose is diarrhea. This acute, self-limiting symptom is generally cited as the primary outcome, largely due to the drug's limited absorption at higher doses. Regulatory information states that no cases of accidental or intentional overdosage resulting in severe, systemic human complications have been formally reported. Consequently, specific severe outcomes, such as cardiovascular or neurological events, are not documented in the official overdose sections.

Required Emergency Actions

It is officially mandated that immediate medical attention should be sought for any suspected overdose. Management described in regulatory labeling involves providing symptomatic treatment to address the acute diarrhea. Additionally, the use of ion-exchange resins may be considered as a supportive measure. Post-exposure, monitoring of liver function tests is an essential procedural requirement documented in the prescribing information. This information serves as the sole basis for required help-seeking triggers.

Therapeutic Uses of Ursa

The core therapeutic domain of Ursa (ursodiol, or ursodeoxycholic acid) is the management of specific hepatobiliary conditions involving inflammatory or irritative processes. It is commonly used for managing symptoms linked to organ-specific functional stress.

This compound is used for the management of conditions presenting with acute or episodic manifestations, such as Primary Biliary Cholangitis (PBC), a condition characterized by periods of heightened symptoms. It is also commonly applied in addressing symptoms related to bile composition, relevant in situations involving recurrent or episodic manifestations that cause increased discomfort.

The medication assists with the management of symptoms that interfere with daily comfort across these conditions. This medicine is used for managing certain liver conditions and addressing episodic manifestations related to bile. This supportive use contributes to improved comfort during periods of heightened symptoms. Ursa is used in clinical settings that involve acute or unstable symptom patterns, providing supportive relief that helps maintain a sense of stability when symptoms are more noticeable.

Quick Fact: Supports Management of Symptoms that Interfere with Daily Functioning

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

Eligibility Map: Who can and cannot use Ursa — official regulatory information

The use of Ursa (Ursodeoxycholic Acid) is governed by strict population eligibility rules outlined in official regulatory documents. Eligibility is defined by the patient's existing health status, specific organ function, and physiological state.


Populations for Whom Use is Contraindicated

Use of Ursa is strictly prohibited in patients with known hypersensitivity to bile acids, complete biliary obstruction, a non-functioning gallbladder, or those with radio-opaque calcified gallstones. The medicine is also contraindicated in cases of unremitting acute cholecystitis, cholangitis, or decompensated hepatic cirrhosis.


Age-Related and Condition-Specific Eligibility

Age: Ursa is approved for adults with established indications. Its use for gallstone dissolution is generally not established or not recommended in children under 18 years, though it is approved for specific pediatric liver disorders like Cystic Fibrosis-associated Liver Disease. No dose adjustment is specified for older adults.

Physiological Status: Use is generally not recommended during pregnancy or lactation due to insufficient data or potential risk. Women of child-bearing potential must use non-hormonal contraception.

Organ Function: Beyond the contraindication in decompensated cirrhosis, caution and monitoring are required for patients with predisposing conditions for intestinal stenosis or stasis, or in cases of severe renal impairment.

What should I know about interactions with other medicines?

The official interaction profile for Ursa (Ursodeoxycholic Acid) is structured around agents that interfere with absorption and medicinal products that antagonize its intended chemical action, as documented by government regulatory authorities.

Documented Pharmacological Interactions

Interaction Type Interacting Agent Official Regulatory Outcome
Reduced Ursa Exposure Bile Acid Sequestering Agents (e.g., Cholestyramine) and Aluminum-based Antacids These substances physically bind bile acids, leading to a reduced absorption and decreased effectiveness of Ursa.
Counteracted Efficacy Estrogens, Oral Contraceptives, and Clofibrate-type Lipid-Lowering Drugs These agents increase cholesterol secretion into the bile, which directly opposes the chemical objective of Ursa and counteracts its therapeutic effect.
Altered Drug Exposure Ciclosporin, Nitrendipine, Dapsone Ursodeoxycholic Acid can increase the intestinal absorption of Ciclosporin, requiring careful monitoring. It has also been documented to reduce the plasma concentrations of Nitrendipine and the effect of Dapsone.

Restrictions and Timing Requirements

For substances that reduce Ursa absorption, regulatory documentation requires mandatory timing separation. Agents such as Bile Acid Sequestering Agents and Aluminum-based Antacids must be taken at least two hours before or two hours after the dose of Ursodeoxycholic Acid. Preparations like Charcoal and Smectite are similarly classified as substances that inhibit absorption. For women taking Ursa for gallstone dissolution, official sources advise the use of non-hormonal contraception due to the established counteracting effect of estrogens.

Mechanism of Action

Bile Acid Pool Modulation and Liver Cell Protection

The drug, a hydrophilic bile acid modulator, acts by altering the composition of the enterohepatic circulation. It achieves selective accumulation in the bile acid pool, where it replaces more lipophilic (fat-soluble) bile acids with its less cytotoxic, water-soluble form. This mechanism reduces the chemical stress and detergent-like damage exerted on the cell membranes of hepatocytes and cholangiocytes, contributing to the stabilization of their cellular structures.


Regulation of Cholesterol and Excretion

Ursa influences the biliary system by two primary actions: competitive inhibition of cholesterol absorption in the small intestine, and decreased secretion of cholesterol from the liver into the bile. These actions collectively lower the concentration of cholesterol in the bile fluid, decreasing its saturation. This chemical change results in the solubilization of cholesterol and increases the flow of bile (choleresis), primarily through an osmotic effect that enhances fluid transport into the bile ducts.

Dosage and Administration Information

How to Use Ursa: Administration Guidelines

Ursa (Ursodeoxycholic Acid) is administered according to specific dosing instructions and schedules defined by prescribed guidelines.

Dosing and Frequency

Usage Condition Standard Dosing Regimen Frequency & Timing Duration Pattern
Primary Biliary Cholangitis (PBC) 13–15 mg/kg per day or 12–16 mg/kg per day. Administered in 2 to 4 divided doses daily with food initially. May consolidate to once daily in the evening later in treatment. Often continued indefinitely.
Gallstone Dissolution 8–12 mg/kg per day. Administered in divided doses, often with the largest dose or the entire dose taken in the evening. Typically 6 to 24 months; continued for 3–4 months after stone disappearance.

Administration Details and Population Rules

Ursa is for oral administration only, available as capsules, tablets, and oral suspension. All solid forms should be swallowed whole with liquid. Tablets that are scored (e.g., 500 mg strength) may be broken in half for precise dosing but must not be chewed.

  • Pediatric Use: For children aged 6 to 18 years with cystic fibrosis-related liver disease, dosing starts at 20 mg/kg per day in 2–3 divided doses, with a potential increase up to 30 mg/kg/day.
  • Concomitant Agents: The medicine must be separated by at least two hours from the administration of aluminum-containing antacids or cholesterol-binding agents like cholestyramine, as these can interfere with its absorption.
  • Dose Adjustment: Standard protocols indicate that if diarrhea occurs, the daily dose must be reduced.

Connection to the Overall Use Protocol

Administration of Ursa is governed by a body-weight-dependent dosing scheme that is taken with food to maximize absorption. The protocol defines a clear shift from initial divided doses to a possible single nightly dose and mandates specific duration patterns tied to the condition, all of which structure the standardized use of the medication.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Ursa

The research for Ursa (Ursodeoxycholic Acid, UDCA) consists of studies that explored its application in specific conditions involving the liver and bile ducts. This overview summarizes the evidence base according to official regulatory and peer-reviewed scientific sources, focusing on what types of studies exist and what their findings describe, rather than providing individual clinical guidance.


Evidence for Use in Primary Biliary Cholangitis (PBC)

Research exploring Ursa was evaluated in the context of PBC through extensive long-term randomized controlled trials (RCTs) and subsequent large-scale observational studies. Researchers monitored major clinical outcomes, such as the need for a liver transplant or all-cause mortality, alongside changes in specific biochemical markers. Studies monitored patterns in the rate of change toward major clinical outcomes between groups studied over the long-term (up to 4 years).

What remains uncertain is the full picture of outcomes in those with advanced, decompensated liver disease, as data for this group remain insufficient. A subset of participants in the research is consistently identified as having no noticeable change in specific biochemical markers when evaluated.


Evidence for the Dissolution of Cholesterol Gallstones

The research base for Ursa explored its application in managing gallstones and focuses on a specific type of stone. The evidence relies mainly on Randomized Controlled Trials (RCTs) monitoring the complete absence of radiolucent (non-calcified) cholesterol gallstones on follow-up imaging. Trials reported that, for a portion of the participants studied, imaging indicated the complete absence of gallstones. It remains important to note that Ursa was studied for cholesterol gallstones only, and long-term effects are not fully established regarding the potential for stone recurrence.


Research on Other Hepatobiliary Conditions

Research has also been conducted to explore Ursa in Primary Sclerosing Cholangitis (PSC) and Intrahepatic Cholestasis of Pregnancy (ICP).

PSC and Inconsistent Research Findings

PSC was studied for various RCTs. Results regarding the endpoint of transplant-free survival were associated with mixed findings across different trials. Furthermore, one major study examining a high-dose regimen was terminated early, which contributed to research uncertainty regarding the high-dose regimen.

ICP and Evidence for Symptom Management

Studies focused on outcomes related to physical discomfort, such as maternal symptoms (severity of itching/pruritus) and maternal biochemical markers. Trials described findings where changes in maternal symptoms and bile acid levels were measured in some studies. However, findings were mixed regarding a statistically significant pattern of change in adverse fetal outcomes when compared to controls.


Evidence Gaps and Research Uncertainty

Key limitations documented in the research include: the persistence of mixed or conflicting findings regarding hard clinical endpoints for conditions like PSC, and the fact that long-term effects are not fully established for several studied conditions, as follow-up durations were limited.

Frequently Asked Questions (FAQ)

Common questions about Ursa (FAQ)

Q: How long after starting Ursa should I expect to see a change?

Clinical study data indicate that changes, such as improvement in liver function markers, may begin to be noted after approximately 3 to 4 weeks of starting treatment. Separately, patients may find that gastrointestinal side effects like loose stools can be more frequent when first starting the medication, suggesting an initial adjustment period.

Q: Does Ursa affect sleep or cause insomnia?

Clinical studies documented in official regulatory materials report that sleep disturbances and difficulty sleeping, known as insomnia, have occurred as an adverse reaction in some patients using Ursa.

Q: What happens in general if a scheduled dose of Ursa is missed?

General patient information indicates a common approach when a dose is missed: to take it when remembered, unless it is close to the time for the next dose. However, patients should refer to their specific prescribing information or consult their healthcare provider for individualized guidance on managing missed doses.

Q: Is Ursa generally considered suitable for people with pre-existing liver conditions?

Regulatory information indicates that the use of Ursa alongside existing liver conditions is associated with the need for close and regular monitoring of liver function. Official documentation specifies that the medication is strictly prohibited in cases of unremitting acute conditions or advanced, decompensated hepatic cirrhosis.

Q: What kind of monitoring or check-ups are typically advised while a person is using Ursa?

Regulatory documents indicate that close monitoring of specific health markers is standard practice during Ursa treatment. This typically includes blood tests for liver function, which are often performed every 4 weeks for the first three months, and then every 3 months afterward.

Q: Is Ursa currently available as a generic medicine?

The active component of Ursa, which is Ursodeoxycholic Acid, is available globally under various generic brand names. Its generic availability is recognized in the listings of major government health authorities.

Q: What are the known limitations or restrictions on activity while taking Ursa?

Official regulatory sources indicate that no effects on the ability to drive or operate machinery have been observed during studies of Ursa.

Q: Is it common to feel nauseous or have stomach upset when first starting Ursa?

Nausea and general stomach upset have been reported as adverse reactions associated with Ursa. However, official documents note that the specific frequency or commonness of these particular effects is not precisely known from the current regulatory data.

Q: Does Ursa impact reproductive health or fertility?

Regulatory information highlights specific guidelines for reproductive health. Official prescribing information states that women of child-bearing potential should use reliable non-hormonal contraception during treatment. Furthermore, the medicine is generally not recommended during pregnancy or breastfeeding due to insufficient data or potential risks.

Q: How is Ursa classified by government health bodies (e.g., is it a controlled substance)?

Ursa, which is classified as a prescription medicine and a hepatoprotective agent, is not designated as a controlled substance according to the schedules and classifications published by major government health bodies.

Q: What are the inactive ingredients or excipients contained in the Ursa formulation?

The active ingredient is Ursodeoxycholic Acid. However, the specific inactive ingredients (excipients) used in the formulation can vary by the specific brand and dosage form. These details are always listed in the official Patient Information Leaflets or Summary of Product Characteristics (SmPC) for that product.

Q: Is Ursa considered a newer medicine, or has it been available for a long time?

The active component, Ursodeoxycholic Acid, is not considered a new medicine. Official documents indicate that it has a history of use spanning many decades, and the chemical itself was first characterized over a hundred years ago.

Q: How does Ursa affect general cognitive function or mental sharpness?

Ursa is not classified as a psychoactive drug that primarily targets cognitive function. However, adverse reaction reports in official data include side effects like headache and dizziness, which may temporarily influence mental sharpness or focus.

Q: What are the common reasons why healthcare providers decide to stop Ursa treatment?

Official texts specify that a serious worsening of liver disease, such as the decompensation of hepatic cirrhosis, requires immediate discontinuation of the medication. Additionally, the occurrence of persistent or severe diarrhea may necessitate a dose reduction or complete cessation of therapy.

Q: What research has been conducted on the long-term safety profile of Ursa?

Long-term research, including extensive Randomized Controlled Trials (RCTs), has been conducted to examine the use of Ursa for conditions like Primary Biliary Cholangitis (PBC). However, regulatory documents note that the data on long-term effects are limited or not fully established across all conditions where the drug has been studied.

Q: Can Ursa cause changes in appetite or weight?

Unusual weight gain or loss has been reported in patient information as a possible adverse effect of Ursa. Official regulatory data indicates that the precise frequency of these weight changes is currently not known from the reported clinical information.

How should Ursa be stored and disposed of?

How to Store and Dispose of Ursa (Ursodiol)

The storage of Ursa (ursodiol) is strictly defined by regulatory standards to ensure product stability. The medication must be kept at Controlled Room Temperature (CRT), which ranges from 20 C to 25 C (68 F to 77 F), with permitted excursions between 15 C and 30 C.

Key Storage and Handling Rules:

  • Temperature: Store only within the Controlled Room Temperature range.
  • Child Safety: Like all medications, Ursa must be kept out of the sight and reach of children.
  • Scored Tablets: If using URSO Forte scored tablets, any broken segments must be stored separately from whole tablets as stated in the prescribing information.

Disposal:

Unused or expired Ursa must be disposed of according to official governmental guidance for safe medicine disposal, which often directs users toward authorized drug take-back programs.

Attention! Always consult to a doctor or pharmacist before using pills or medicines.

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