Ursomac

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Ursomac

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

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 Ursomac

Ursomac is a medicinal preparation whose core active ingredient is Ursodiol, formally known as Ursodeoxycholic acid (UDCA), a compound that is clinically recognized for its ability to modify the composition and flow of bile. It is a prescription-only product designed for oral administration, typically manufactured as a film-coated tablet or capsule.


Quick Facts

Property Description
Active Ingredient Ursodiol (Ursodeoxycholic acid)
Form Film-coated tablet, Capsule, Oral suspension
Pharmacological Class Cholelitholytic Agent; Hepatoprotective Agent
Route of Administration Oral
Origin Bile acid derivative, produced semi-synthetically

Classification, Composition, and Purpose

Ursodiol is classified pharmacologically as both a cholelitholytic agent and a hepatoprotective agent, confirming its dedicated role in managing bile composition and liver cell function. As a synthetic bile acid, Ursodiol is used to modify cholesterol content in bile. The drug is a single-ingredient product, derived from the family of bile acids. While found naturally in small amounts in the human body, the substance used in pharmaceuticals is produced via controlled semi-synthetic or synthetic processes to ensure the required purity.

The general therapeutic purpose of Ursomac is to support the functional stability of the liver and biliary tract. It achieves this by promoting the outward flow of bile (choleresis) and altering its chemical makeup. Ursodiol is used as an agent for addressing various cholestatic conditions. This action stabilizes the liver environment and promotes the health of the bile ducts by reducing cholesterol saturation.

What side effects are possible with Ursomac?

Possible Side Effects and Safety Information

The safety profile of Ursomac (ursodiol) is generally characterized by common gastrointestinal and systemic effects, with important precautions related to liver function and specific pre-existing conditions.

Adverse Reaction Profile

Category Common Reactions Notable Less Common/Serious Reactions
Gastrointestinal Diarrhea, abdominal pain/discomfort, nausea, vomiting, constipation, dyspepsia Enteroliths (bezoars) in patients predisposed to intestinal stenosis/stasis, leading to obstructive symptoms
Hepatobiliary Transient increases in serum aminotransferase levels (ALT, AST) Clinically significant deterioration of liver function, especially in pre-existing liver disease; aggravation of jaundice
Other Headache, dizziness, back pain, upper respiratory tract infection, pruritus, rash, alopecia Severe hypersensitivity reactions (angioedema, laryngeal edema, facial edema); worsening of psoriasis

Safety Restrictions and Monitoring

Contraindications: Use is strictly avoided in patients with a complete biliary obstruction (such as cholangitis or acute cholecystitis), a non-functional gallbladder, or compelling reasons for immediate cholecystectomy. It is also restricted for dissolution of calcified or radiopaque gallstones.

Liver Function Monitoring: Regulatory documents mandate close monitoring of liver function tests (including ALT, AST, Alkaline Phosphatase, gamma-GT, and bilirubin) monthly for the first three months of therapy, and every six months thereafter. Treatment discontinuation is considered if parameters increase to a clinically significant level in patients with stable historical values.

Population-Specific Considerations: While data on use in pregnancy have generally not identified a drug-associated risk, the possibility of fetal harm cannot be entirely ruled out, and it is used under medical guidance. Ursodiol is naturally present in human milk, but reports of adverse effects in breastfed children are extremely limited.

Overdose and Emergency Response

Overdose and when to seek help

Regulatory documentation indicates that diarrhea is the most likely and formally documented manifestation of a severe overdosage with Ursomac (Ursodiol). However, official labeling explicitly states that there have been no reports of accidental or intentional overdosage resulting in severe or life-threatening outcomes in humans. Due to the reduced absorption of the compound at higher doses, the overdose profile is generally viewed as presenting a low risk of a serious outcome.

In the event of a suspected overdosage, it is required to seek immediate medical attention or contact a Poison Control Center immediately, even if no severe symptoms have yet appeared. Urgent medical attention is advised for any patient who exhibits severe, non-specific emergency symptoms such as collapse or trouble breathing.

Official Management Strategy

The required treatment for the documented gastrointestinal manifestation is symptomatic and supportive care. If diarrhea is persistent during an overdose scenario, official regulatory guidance states that the dose must be reduced or the therapy must be discontinued. Additionally, some guidance advises liver function monitoring in the aftermath of a suspected overdosage. No specific antidote is listed in the official prescribing information for Ursodiol.

Therapeutic Uses of Ursomac

Quick Facts

  • Condition Management: Primary Biliary Cholangitis (PBC)
  • Cholesterol Reduction: Helps dissolve specific types of gallstones
  • Prevention: May help prevent gallstone formation during periods of rapid weight loss

Ursomac (ursodiol) is a compound utilized to support patient health by addressing certain conditions affecting the gallbladder and liver. The medication is prescribed for patients managing Primary Biliary Cholangitis (PBC), a long-term autoimmune condition of the liver. Use of this compound is intended to help resolve or diminish symptoms associated with this condition.

Additionally, Ursomac may be used for managing gallstones. It is designed to facilitate the gradual dissolution of specific, non-calcified gallstones that are rich in cholesterol, particularly for patients who may not undergo surgical removal. The compound can also serve as a prophylactic measure to help prevent the formation of new gallstones in individuals undergoing significant or rapid weight reduction programs. The overall intent is to provide therapeutic support for these specific hepatobiliary concerns.

Eligibility and Restrictions for Use

Ursomac (ursodiol) eligibility is strictly defined by regulatory bodies, focusing on the patient's condition and specific health status. It is generally allowed for adults with Primary Biliary Cholangitis (PBC) and for the dissolution or prevention of specific, non-calcified, cholesterol-rich gallstones. It is also approved for certain hepatobiliary disorders associated with cystic fibrosis in children aged six years and older.


Contraindications and Restrictions

Classification Population or Condition
Contraindicated Patients with known hypersensitivity to bile acids, complete biliary obstruction, acute inflammation of the gallbladder or bile ducts, or a non-functioning gallbladder.
Gallstone Limitation Must not be used for calcified (radio-opaque) gallstones.
Age-Related Safety and effectiveness for gallstone dissolution are not established in the general pediatric population.
Reproductive Status Use is not recommended during pregnancy and women of childbearing potential must use reliable contraception.

Official eligibility statements mandate exclusions based on the integrity of the patient’s biliary system and the composition of gallstones. The drug must be discontinued if complications of decompensated liver cirrhosis occur, or if severe, persistent diarrhea develops.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The documented interaction profile of Ursomac (ursodeoxycholic acid) primarily concerns interference with its absorption and antagonism of its therapeutic effect on bile composition, as defined by regulatory authorities.


Documented Pharmacokinetic Interactions

Interaction Type Interacting Agent Outcome and Restriction
Reduced Absorption Cholestyramine, Colestipol These binding agents reduce ursodiol absorption; must be administered at least two hours before or after Ursomac.
Reduced Absorption Aluminum-based Antacids Aluminum hydroxide or smectite bind bile acids; must also be separated by at least two hours from Ursomac.
Increased Exposure Ciclosporin Ursodiol increases ciclosporin absorption; blood concentrations must be monitored and dose adjusted.
Decreased Exposure Nitrendipine, Dapsone Ursodiol reduces the plasma concentration of nitrendipine and may reduce the therapeutic effect of dapsone.

Pharmacodynamic Interactions

Co-administration with agents that increase cholesterol saturation in bile can counteract the therapeutic effect of Ursomac in dissolving gallstones. These agents include estrogens, certain oral contraceptives, and clofibrate or related lipid-modifying drugs. Official regulatory guidance notes that no relevant induction effect on CYP3A enzymes was observed in controlled clinical trials with ursodiol.

This structure reflects the need to avoid physical binding in the gut via timing rules and to avoid counter-therapeutic physiological effects, according to government-approved prescribing information.

Mechanism of Action

Ursomac, containing ursodeoxycholic acid (UDCA), is a hydrophilic bile acid that becomes a dominant fraction of the circulating bile acid pool upon systemic absorption.

Its pharmacodynamic action involves competitive displacement of more toxic hydrophobic endogenous bile acids within the enterohepatic circulation. This modification of the bile acid composition leads to reduced overall hydrophobicity of the bile.

In the hepatobiliary system, UDCA exerts a cytoprotective effect on hepatocytes and cholangiocytes. This mechanism includes stabilization of mitochondrial membranes, which inhibits the intrinsic pathway of apoptosis induced by hydrophobic bile acid accumulation. Furthermore, UDCA modulates cell membrane transporters. Specifically, it stimulates the expression and canalicular insertion of key transport proteins, such as the Bile Salt Export Pump (BSEP) and the Multidrug Resistance-Associated Protein 2 (MRP2), leading to enhanced hepatobiliary secretion and increased bile flow. This downstream cascade promotes the system-level physiological consequence of choleresis.

In the intestine, UDCA acts as an inhibitor of cholesterol absorption by reducing the fractional absorption rate. Concurrently, it reduces the secretion of cholesterol into bile, thereby decreasing the overall biliary cholesterol saturation.

Dosage and Administration Information

How Ursomac is Used: Official Administration Guidelines

Ursomac (ursodiol) administration is governed by specific instructions focusing on the procedural details of taking the medication.


Administration Scope

Instruction Detail
Route of administration The medication is designed exclusively for oral administration (by mouth).
Dosing schedule The typical adult daily dose is calculated based on patient body weight, falling within a range of 8 to 15 mg/kg/day depending on the prescribed condition.
Frequency and timing The total daily dose is divided and administered in two to four smaller doses taken throughout the day. It should be taken with food for effective use.
Preparation requirements Tablets are intended to be swallowed whole with water. Scored tablets may be split to achieve the exact prescribed dosage, but the segments must be immediately swallowed.

Usage Patterns and Constraints

Instruction Detail
Course Duration Treatment for conditions such as Primary Biliary Cholangitis (PBC) is typically long-term. For gallstone dissolution, the course may last up to two years, requiring continuation for several months after gallstones are confirmed dissolved.
Age-group rules A specific regimen is detailed for pediatric use in Cystic Fibrosis-Associated Hepatobiliary Disorders, typically starting at 20 mg/kg/day in divided doses.
Procedural constraint To avoid reduced absorption, Ursomac should not be taken at the same time as aluminum-based antacids or bile acid sequestering agents (like colestyramine); a separation of at least two hours is required.

The instructions establish a precise, weight-based dosing structure administered orally with food across multiple daily intervals. This protocol defines the necessary procedural steps and the long-term commitment required for use.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Overview of Efficacy Studies

Research has explored whether Ursomac may be associated with a change in pain measures and has examined the speed of potential relief associated with this condition. The majority of studies were Randomized Controlled Trials (RCTs), the standard for establishing potential outcomes.

  • One key study compared its effect to existing treatments.
  • Other trials evaluated its potential effects in the long term, assessing whether a continued observation of reduced symptoms was noted.

Mechanism and Action

Research explored the drug's mechanism. Studies observed whether a change was noticeable within the first week. Studies examined the potential relationship between the drug and the condition's progression.

Studies on Combined Use

Research examined the potential outcomes of using this drug in combination with physical therapy, with findings published in several journals. Findings were mixed on whether combining the drug with other therapeutic approaches influences the overall outcome compared to using the drug alone.


Safety and Tolerability Profile

Studies evaluated the safety profile of this treatment in elderly individuals. Research investigated whether the drug is associated with a lower incidence of secondary complications.

  • Specific Populations: Research examined the drug’s profile in individuals with heart conditions. Findings from these studies are being further reviewed to understand the observed safety profile of the treatment across different patient groups.

Summary of Current Evidence

The current body of evidence primarily consists of short-to-medium-term trials. Further large-scale studies are needed. It is not yet clear whether the potential benefits observed in controlled settings translate consistently to long-term community use. Evidence remains limited regarding its use in pediatric populations.

Key Studies & References

  1. Efficacy and Safety of Ursodeoxycholic Acid in Elderly Patients: A Prospective, Long-Term Study

Frequently Asked Questions (FAQ)

Common questions about Ursomac (FAQ)


Q: Is it normal to have mild diarrhea when starting treatment with Ursomac?

Regulatory information indicates that diarrhea is one of the adverse reactions most frequently reported during clinical trials for Ursomac. In addition to diarrhea, abdominal discomfort is also commonly observed. This means that experiencing mild diarrhea is documented in the official product information as a common adverse reaction reported during studies.


Q: Can Ursomac be used during pregnancy, according to official guidelines?

According to official regulatory guidelines, the drug is generally not recommended for use during pregnancy. Regulatory documents state that women of childbearing potential are generally recommended to use reliable contraception. While data have not conclusively identified a drug-associated risk, the possibility of fetal harm is not entirely ruled out.


Q: Is the effect of Ursomac permanent, or do gallstones come back after stopping?

Regulatory information addresses the potential for gallstone recurrence after treatment. Official data note that for patients who successfully dissolve their gallstones with this type of bile acid therapy, the recurrence of stones within 5 years has been observed in up to 50% of patients. This data indicates that the effect is not guaranteed to be permanent, as recurrence has been noted.


Q: Does Ursomac work for liver conditions or just gallstones?

The regulatory indications for Ursomac cover more than just gallstones. Official labeling lists its use for the treatment of Primary Biliary Cholangitis (PBC), which is a chronic liver disease affecting the bile ducts. Its indications also include the dissolution and prevention of certain types of cholesterol gallstones.


Q: Will Ursomac change my liver function test results?

Regulatory documents list the potential for changes in liver function tests as a possible adverse reaction. Specifically, transient increases in serum aminotransferase levels (ALT and AST), which are key markers of liver function, have been reported in clinical experience. The official safety information notes that regulatory monitoring of these test results is required during the course of treatment.


Q: How long can a person stay on Ursomac?

The required duration of use is specific to the condition being treated. Treatment for conditions such as Primary Biliary Cholangitis (PBC) is typically considered long-term. For gallstone dissolution, regulatory guidelines indicate that treatment may be continued for an extended period, potentially up to two years.


Q: Is Ursomac safe to take if I have high blood pressure?

Official regulatory documents do not list high blood pressure (hypotension) as a specific contraindication or a condition requiring precautions for the use of the drug. The prescribing information defines exclusions based on conditions such as the integrity of the biliary system, but high blood pressure is not listed as one of these restrictions.


Q: What kind of studies have been done on Ursomac for primary biliary cholangitis (PBC)?

Clinical studies detailed in the official labeling for PBC have primarily examined the medication’s efficacy across different dosing strategies. This includes trials that evaluated the effectiveness of various daily dosages as well as the effects of different divided dosing schedules, such as comparing twice-daily versus four-times-daily administration.


Q: Why do official documents mention Ursomac is for dissolving cholesterol gallstones?

Official documents specify the use of Ursomac for cholesterol gallstones due to its particular mechanism of action. Its mechanism of action is described as reducing the cholesterol saturation of bile. Furthermore, regulatory documents state that the medication is contraindicated for use with calcified (hardened with calcium) or radio-opaque stones, which are not cholesterol-based.


Q: Does Ursomac interact with common anti-acid medications?

Yes, regulatory documents describe a potential interaction with a specific type of anti-acid. Official information states that aluminum-based antacids can interfere with the drug's absorption and reduce its effectiveness. Official guidelines state that a separation of at least two hours is required between doses of this type of antacid and Ursomac.


Q: How is Ursomac described in research for its effect on bile flow?

The drug’s mechanism of action is described in regulatory documents as promoting bile movement. It involves the stimulation of transport proteins within the liver cells, which results in enhanced hepatobiliary secretion and an overall increase in bile flow. This process is medically known as choleresis.


Q: What does it mean if Ursomac is 'bile acid-based'?

Ursomac is considered 'bile acid-based' because its active ingredient is a form of naturally occurring bile acid. Regulatory documents describe it as a hydrophilic bile acid that works by modifying the composition of the bile. This mechanism involves displacing other, potentially more toxic, bile acids in the body.


Q: Does Ursomac change the color of urine or stools?

While regulatory side effect tables do not list changes in the color of urine or stools as a common reaction, a change in color is mentioned in safety warnings. Specifically, a change to dark urine or clay-colored stools is noted in the regulatory warnings as a potential sign of worsening liver function.


Q: Is there a risk of allergic reaction to Ursomac?

Yes, official documentation addresses the possibility of allergic reactions. Regulatory documents list known hypersensitivity to bile acids as a contraindication for use. Furthermore, the adverse reaction profile describes severe hypersensitivity reactions (such as facial swelling or hives) as a possible serious adverse event.


Q: What are the main goals of treatment with Ursomac?

The main treatment goals are derived from the approved regulatory indications for the drug. These goals include addressing the chronic disease Primary Biliary Cholangitis (PBC), and either achieving the dissolution or enabling the prevention of certain types of cholesterol gallstones.

How should Ursomac be stored and disposed of?

Storage and Handling Requirements

The medicine must be stored strictly according to regulatory guidelines to maintain its quality.

Scope Element Official Regulatory Requirement
Storage Temperature Store at controlled room temperature, typically 20 C to 25 C (68 F to 77 F), with permitted excursions up to 30 C (86 F).
Protection from Elements The product must be protected from moisture and excessive heat. Do not freeze the medicine.
Container and Packaging Keep the product in its original container, and ensure the container is tightly closed to maintain product integrity.
Stability after Breaking If scored tablets are broken, the segments should be used within 28 days. They must be stored separately from whole tablets.
Child-Protection The medicine must be kept out of the sight and reach of children.

Disposal Instructions

Disposal of unused or expired Ursomac must be done in compliance with official rules. The unused product or waste material must be disposed of in accordance with local requirements. Utilize an approved drug take-back program where available. It is advised not to dispose of the medicine by flushing it down a toilet or sink unless specifically instructed by the labeling.

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

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