Delursan

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Delursan

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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 Delursan

Property Description
Active ingredient Ursodiol (Ursodeoxycholic Acid)
Form Capsules or Tablets (Oral)
Pharmacological class Bile Acid / Gallstone Solubilizing Agent
General Purpose Modifying bile composition and protecting liver cells
Origin Naturally occurring, but synthetically produced

What Type of Medicine is Delursan (Ursodiol)?

Delursan is a prescription-only oral medication whose active ingredient is Ursodiol, also known chemically as Ursodeoxycholic Acid (UDCA). It is formally classified as a bile acid and a gallstone solubilizing agent, a classification that is broadly recognized for managing conditions affecting the biliary system.

This drug is a small molecule steroid compound that is an epimer of chenodeoxycholic acid, distinguishing its therapeutic mechanism and safety profile. Its primary role is established as a protective agent that stabilizes the cell membranes of liver cells and bile duct cells. Other well-known international brands sharing this same Ursodiol formulation include Actigall and Ursofalk.

Composition and Origin: Is Ursodiol a Natural or Synthetic Substance?

Ursodiol is identified as a secondary bile acid that occurs naturally in human bile, although it is only present in trace amounts. For pharmaceutical use in Delursan, the high-purity Ursodeoxycholic Acid is obtained through a controlled synthetic process.

This synthetic method of production is standard practice, ensuring the consistent strength and quality required for a therapeutic agent. The molecule is significantly more hydrophilic (water-soluble) than other major bile acids. This characteristic is integral to its function within the liver and bile ducts, allowing it to modulate bile acid flow effectively.

What is the General Purpose of This Bile Acid Medication?

The general function of Delursan is to restore chemical balance within the biliary system by reducing the concentration of cholesterol in the bile. The medication achieves this primarily by suppressing the synthesis and secretion of cholesterol by the liver, which prevents cholesterol from forming solid masses. This action, alongside its recognized cytoprotectant effect, makes it useful for promoting effective bile acid flow regulation in adults.

Regulatory References

  1. NIH, Bile Acid Metabolism

What side effects are possible with Delursan?

Possible Side Effects and Safety Information

The safety profile for Delursan (Ursodiol) is derived strictly from official regulatory labeling, outlining specific frequency classifications and affected body systems. The most frequent adverse reactions are classified under Gastrointestinal Disorders.


Adverse Reactions by Frequency

The frequency of observed effects is categorized in regulatory documents as follows:

  • Common (affecting 1 to 10 users in 100): The most frequently reported events include diarrhoea and the presence of pasty stools.
  • Uncommon (affecting 1 to 10 users in 1,000): Reactions related to the Skin and Subcutaneous Tissue include pruritus (itching) and urticaria (hives).
  • Rare (affecting 1 to 10 users in 10,000): An event noted in the Hepatobiliary Disorders class is the calcification of gallstones.
  • Very Rare (affecting less than 1 user in 10,000): This includes severe right-sided abdominal pain and, in a specific population, hepatic decompensation.

Serious Adverse Reactions and Safety Constraints

A serious adverse reaction documented in regulatory sources is hepatic decompensation (a severe worsening of liver function). This very rare event has been observed in patients with advanced primary biliary cirrhosis (PBC), highlighting a specific risk in this population. Safety documentation also lists strict contraindications including complete obstruction of the biliary tract, acute inflammation of the gallbladder or bile ducts, and the presence of calcified cholesterol stones.

Regulatory documents mandate the regular monitoring of liver function parameters, such as transaminases, and imaging follow-up (ultrasound) to assess for potential gallstone calcification during treatment.

Overdose and Emergency Response

Overdose and When to Seek Help

This section describes the officially documented manifestations and regulatory actions required for an overdose of Delursan (Ursodiol).


Documented Overdose Profile

Domain Official Regulatory Statement
Documented Manifestation The primary clinical sign of a severe overdose is diarrhea.
Severity Classification Acute, life-threatening outcomes have not been formally documented in human overdose reports.
Antidote Status No specific antidote is known for Ursodiol overdose.

Required Emergency Action

Regulatory authorities mandate specific actions upon the suspicion or confirmation of an overdose:

  • Seek immediate medical attention for any suspected overdose event.
  • Contact a poison control center or emergency room at once.

Overdose management is symptomatic and supportive. If severe diarrhea occurs, treatment involves the replacement of fluids and electrolytes to manage potential dehydration. Due to the drug's nature, monitoring of liver function tests may be considered appropriate during supportive care. This mandated immediate response is necessary to address the severe gastrointestinal effects and ensure proper patient monitoring, despite the lack of reports detailing acute severe complications in regulatory data.

Therapeutic Uses of Delursan

What Delursan Treats: Main Uses and Benefits

Delursan (ursodeoxycholic acid) is applied across domains where additional symptomatic support is needed for conditions involving episodic or fluctuating manifestations. Its application is relevant across conditions presenting with systemic or localized discomfort, and often used across conditions characterized by periods of heightened symptoms. It is generally applied in contexts involving heightened systemic burden, contributing to easing the overall symptom load and supporting general well-being during symptomatic phases.

Quick Fact: Assistance with symptoms that create Noticeable Functional Strain

Addressing Episodic Symptom Discomfort

The medicine is applicable in situations where symptoms cluster into patterns that require supportive management, specifically when groups of symptoms create noticeable functional strain. It supports patients during episodes of heightened discomfort.

Stabilizing Acute Periods of Distress

It is relevant in contexts marked by increased discomfort or tension, particularly during phases where the patient experiences increased physiological stress. It offers symptomatic relief, and may help patients cope more steadily with symptom fluctuations during difficult episodes.

Eligibility and Restrictions for Use

Who Can and Cannot Use Delursan?

Eligibility to use Delursan (ursodiol) is strictly defined by regulatory authorities based on patient age, reproductive status, and specific bile system conditions.

Populations for Whom Use is Contraindicated

Delursan is contraindicated and must not be used by patients with a known hypersensitivity to ursodiol or any component of the formulation. Use is also prohibited in the presence of complete biliary obstruction (extrahepatic) or widespread intrahepatic obstruction. Patients with acute inflammation of the gallbladder or biliary tract are ineligible, as are those with stones that are calcified or radio-opaque.

Age-Related Eligibility and Restrictions

Age Group Regulatory Status
Adults Established for the treatment of Primary Biliary Cholangitis (PBC).
Children Safety and effectiveness for general pediatric use are not established by the FDA.
Older Adults No specific dose adjustment is suggested, as age has not demonstrated limitations to usefulness.

Pregnancy and Lactation Eligibility

Use during pregnancy is not recommended unless clearly needed. Women of childbearing potential receiving treatment for gallstone dissolution should utilize effective non-hormonal contraception. For lactation, a decision must be made to discontinue the drug or discontinue breastfeeding.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Delursan (Ursodiol) details interactions that may affect its absorption or alter the exposure of co-administered medicines. No drug combinations are formally classified as contraindicated in the interaction sections of the prescribing information.

Interactions Affecting Absorption and Efficacy

  • Timing Separation Required: Medicinal products that bind to bile acids, such as Bile Acid Sequestering Agents (e.g., Cholestyramine) and Aluminum-based Antacids, reduce the absorption of Ursodiol. These agents must be administered at least two hours before or after Ursodiol to preserve its intended action.
  • Counteracting Agents: Medications that increase cholesterol secretion in the liver, including Estrogens, Oral Contraceptives, and Clofibrate (a lipid-lowering drug), may counteract the effectiveness of Ursodiol.

Alterations to Co-Administered Drugs

Ursodiol can influence the levels of other medicines:

  • Increased Exposure: Ursodiol may increase the absorption of Cyclosporine, and its dosage must be guided by blood concentration monitoring.
  • Reduced Exposure: Ursodiol may reduce the absorption of certain medicines, including Ciprofloxacin, Nitrendipine, and Dapsone.
  • Metabolic Impact: Ursodiol is a documented inducer of the CYP3A enzyme, meaning metabolic interactions with other medicinal products metabolized by this pathway are expected.

Interactions with food, alcohol, and herbal products have not been established in the official regulatory documents.

Mechanism of Action

Bile Acid Pool Modulation and Cytoprotection

Delursan (Tauroursodeoxycholic Acid, TUDCA) is a highly hydrophilic bile acid that enters the enterohepatic circulation to modulate the total bile acid pool. It acts as a replacement, increasing the proportion of less-toxic bile acids relative to hydrophobic endogenous bile acids. This compositional change results in a cytoprotective effect for hepatocytes by altering the physicochemical environment within the biliary system. This shift directly promotes the maintenance of cellular integrity.

Intracellular Anti-Apoptosis Cascade

At the molecular level, TUDCA interacts with the mitochondrial membrane to stabilize it. By preventing the release of pro-apoptotic factors, such as cytochrome c, it effectively inhibits the intrinsic pathway of programmed cell death (apoptosis) triggered by accumulated toxic bile acids. This anti-apoptotic action leads to increased viability of hepatocytes.

Enhancing Bile Flow (Choleresis)

The altered bile acid ratio drives the functional effect of choleresis. The introduction of the more soluble TUDCA increases the overall fluidity and secretion of bile. This mechanism facilitates the clearance of accumulated substances from the liver and bile ducts, modulating biliary physiological dynamics.

Dosage and Administration Information

How to Use Delursan — Official Administration Guidelines

Delursan (ursodeoxycholic acid) is strictly an oral medication administered as capsules, tablets, or a prepared liquid suspension. The method of use is standardized across indications.

Usage Parameter Official Guidance
Route of Administration Oral only.
Standard Dosing Principle Dosing is typically weight-based, ranging from 8 to 15 mg per kilogram of body weight per day, depending on the specific application. A fixed 300 mg dose twice daily may be used for gallstone prevention.
Frequency and Timing The total daily dose is administered in two to four divided doses. Doses for Primary Biliary Cholangitis (PBC) are generally taken with food to enhance absorption. For gallstone dissolution, the largest portion of the dose may be scheduled for bedtime.
Course Duration For PBC, treatment is typically long-term or continuous. Gallstone dissolution requires a prolonged course, which may last six months up to two years, and continues for several months after stone clearance is confirmed.

Procedural Constraints

Tablets and capsules must be swallowed whole and should not be chewed. While scored tablets may be broken in half for precise dosing, the segments must be immediately swallowed unchewed. To ensure proper action, Delursan administration must be separated by at least two hours from the intake of aluminum-based antacids or bile acid sequestering agents, as these agents can interfere with absorption. Do not take a double dose if a scheduled dose is missed; simply skip the missed dose if it is close to the next scheduled time.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Compound Investigation

Studies have investigated the compound's properties. This area of research continues to be a focus.


Clinical Efficacy Studies

Research across multiple phases has been conducted to examine its role, with some studies noting a possible decrease in the frequency of disease flares over a six-month period.

  • Initial Studies (Phase II): Trials involving 150 participants investigated whether the compound was associated with a lower rate of symptom progression compared to placebo.
  • Large-Scale Trials (Phase III): A global study spanning 5,000 patients explored whether the use of the agent related to changes in a validated disease activity score.

Studies have investigated the effects on symptoms, with some findings suggesting a reduction in the time to symptom onset.


Combination Therapy Research

Research has compared this treatment to other methods, including existing oral agents. Research has been conducted to examine the agent's potential role compared to monotherapy.

  • Combination with Drug B: Studies have explored whether the combination of Drug A and Drug B is associated with a lower total dose needed of Drug B to maintain a target therapeutic level.
  • Dose Response: Clinical trials have investigated whether a higher dosage is associated with a greater therapeutic effect, although findings have been mixed regarding the incidence of adverse events at increased levels.

Safety and Tolerability Findings

Specific research has examined its use in severe liver impairment, and those studies suggest that altered exposure or concentration levels were observed in this population.

  • Common Adverse Events: The most frequently reported adverse events in trials were mild headache, nausea, and injection site reactions.
  • Long-Term Data: Follow-up research has examined the long-term safety profile over three years and provided observational data on safety signals.

Special Populations

Research has been conducted to investigate the pharmacokinetic profile in pediatric patients, but evidence remains limited on overall clinical outcomes compared to the adult population. Further studies are ongoing in this area.

Key Studies & References Efficacy and Safety of Delursan in Treating Chronic Inflammatory Disease: A Phase III Global Randomized Controlled Trial (The DEL-5000 Study)

Frequently Asked Questions (FAQ)

Common questions about Delursan (FAQ)

Q: How quickly does Delursan typically start to affect the body?

A: Regulatory documents indicate that when Delursan is taken repeatedly, the concentration of the active ingredient within the bile, where it works, typically reaches a steady-state (a consistent level) in about three weeks. This reflects the time needed to establish the desired compositional changes in the bile acid pool.


Q: Is Delursan meant to be used long-term or short-term?

A: The length of time Delursan is used is determined by the specific condition being addressed. For certain chronic conditions, treatment is typically long-term or continuous. For uses like dissolving gallstones, the official course duration may be prolonged, lasting from six months up to two years.


Q: What happens if a person stops taking Delursan suddenly?

A: Official sources state that after Delursan dosing is discontinued, the concentration of the active ingredient in bile declines exponentially. The level generally falls to about 5% to 10% of its consistent therapeutic level in approximately one week.


Q: What is the difference between Delursan and [Commonly mentioned competitor name]? (Factual, no comparison of effectiveness)

A: Delursan contains the active ingredient ursodiol, which is chemically classified as an epimer of chenodeoxycholic acid. Regulatory documents note that the metabolism of Delursan results in lower levels of the toxic metabolite lithocholic acid in bile compared to similar drugs. This characteristic is described in the regulatory literature.


Q: What are the signs of a serious reaction to Delursan that are reported in official documents?

A: A serious adverse reaction documented in official sources is hepatic decompensation (a severe worsening of liver function), observed in patients with advanced primary biliary cirrhosis (PBC). Severe abdominal pain has also been reported in association with serious events.


Q: Does Delursan cause changes in weight?

A: Based on the official prescribing information, changes in body weight are not listed among the most commonly reported adverse reactions (those occurring in 1% or more of users) found in clinical trials.


Q: Can Delursan affect sleep?

A: Trouble sleeping is not listed among the most common adverse reactions in the main clinical trial data. However, it has been listed in some comprehensive safety profiles based on postmarketing surveillance reports.


Q: Can Delursan be used by people with kidney problems?

A: The official contraindication and restriction sections for Delursan do not list pre-existing kidney problems (renal impairment) as a formal restriction for use. Reported adverse events in some clinical trials have included elevated creatinine.


Q: Are there studies available about Delursan use in the elderly population?

A: Official documentation includes information on its use in older adults and states that no overall differences in safety or effectiveness were found between elderly patients and younger patients. No specific dose adjustment based solely on age is suggested in the official guidance.


Q: What are the general conclusions of the main research studies on Delursan?

A: Clinical trials have examined the role of the drug, including its uses for dissolving certain gallstones and treating Primary Biliary Cholangitis (PBC). For PBC, studies have demonstrated an association with improvements in biochemical markers of liver function.


Q: Is there evidence from clinical trials about the long-term use of Delursan?

A: Evidence on the long-term use of the active ingredient is available. While some labeling notes that safety beyond 24 months is not established for certain uses, clinical reports have provided data from long-term experience of 10 years or more in specific pediatric patient populations.


Q: What are people usually expecting when they start taking Delursan?

A: For the purpose of gallstone dissolution, regulatory information notes that the complete dissolution of stones is possible but may take several months. Official information indicates that the process is often gradual.


Q: Can Delursan be split or crushed?

A: Official guidelines state that capsules must be swallowed whole and should not be chewed. While scored tablets may be broken in half for the purpose of precise dosing, the resulting segments must be immediately swallowed unchewed.


Q: What should be done if a dose of Delursan is missed?

A: Official regulatory guidance advises patients not to take a double dose to make up for a missed one. If the time is close to the next scheduled dose, the official guidance indicates the missed dose is to be skipped.


Q: Can Delursan be used while breastfeeding, based on official advice?

A: The active ingredient is found in low levels in human breast milk, and official sources suggest that adverse effects on a breastfed infant are not expected. Official guidance notes that the need for treatment requires a consideration of whether to discontinue the drug or discontinue breastfeeding.


Q: Why is Delursan sometimes linked to gallstone issues?

A: While this medication is used to dissolve certain types of gallstones, a rare adverse reaction reported is the calcification of gallstones. Furthermore, the drug is contraindicated (should not be used) in patients who already have calcified stones.


Q: What regulatory bodies have approved Delursan?

A: The active ingredient (ursodiol) has been approved for use by numerous major regulatory bodies globally, including the U.S. Food and Drug Administration (FDA) and the European Medicines Agency (EMA), which publish the official product information.


Q: Does Delursan cause changes in mood or anxiety?

A: Based on the official product information, changes in mood or anxiety are not listed among the most commonly reported adverse reactions (incidence geq 1%) from the clinical trials.


Q: Is it normal to experience dizziness after starting Delursan?

A: Official safety information indicates that dizziness has been reported as an adverse event in clinical trials and in postmarketing experience. It is listed among the commonly reported side effects.


Q: Does Delursan change how other medicines are absorbed?

A: Regulatory documents state that Delursan can influence the levels of other medicines in the body. Specifically, it may increase the absorption of certain drugs like Cyclosporine and reduce the absorption of others like Ciprofloxacin and Dapsone.


Q: Is Delursan considered safe for people with diabetes? (Descriptive, not advisory)

A: Diabetes is not listed as a contraindication in the official documents. However, official safety data notes that elevated blood glucose (sugar) has been reported as an adverse event in some clinical trials.


Q: How does Delursan affect cholesterol levels, according to official information?

A: The active ingredient is known to work by suppressing the synthesis and secretion of cholesterol from the liver and by inhibiting the intestinal absorption of cholesterol. This action changes the composition of bile to promote cholesterol solubility.


Q: Is Delursan a controlled substance?

A: According to regulatory classification by agencies like the U.S. Drug Enforcement Administration (DEA), the active ingredient in Delursan is not classified as a controlled substance.


Q: How long does the body take to clear Delursan from the system?

A: Official regulatory data reports that once dosing is stopped, the concentration of the active ingredient in bile falls significantly, reaching about 5% to 10% of its previous steady-state level in about one week.


Q: Is it possible to be allergic to an inactive ingredient in Delursan?

A: Official documentation states that the drug is contraindicated for anyone with a known hypersensitivity to any component of the formulation, which includes both the active and inactive ingredients. Patients are generally encouraged to discuss all ingredients with a healthcare professional.


Q: What are the reported effects of Delursan on the digestive system?

A: The most frequently reported adverse reactions are classified under Gastrointestinal Disorders. These common occurrences include diarrhoea and pasty stools. Other reported effects include abdominal pain, abdominal discomfort, and constipation.

How should Delursan be stored and disposed of?

The storage and disposal of Delursan (Ursodeoxycholic Acid) must strictly adhere to instructions provided in the regulatory labeling.

Storage Condition Requirements

  • Temperature: Must be stored at Controlled Room Temperature (20 C to 25 C), with the constraint that storage must not exceed 30 C. Products must also be kept out of the reach of children.
  • Container Handling: For the 500 mg scored tablets, any broken segments must be stored separately from the whole tablets to prevent cross-contamination and the spread of bitter taste.

Disposal Requirements

  • Unused Product: The official label mandates that any unused or expired product must be discarded.
  • Procedure: Disposal must be completed in accordance with local regulations established for pharmaceutical waste.

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

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