Urifron

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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 Urifron

Quick Facts

Property Description
Active Ingredient Interferon Alfa-2b
Form Lyophilized Powder for Injection or Injectable Solution
Pharmacological Class Immunomodulator, Antiviral, Antineoplastic Agent
Common Use Augmentation of the innate immune system
Origin Recombinant Human Protein (Synthetic/Derived)

Interferon Alfa-2b: A Biologic Immunomodulator

Urifron is the trade name for the pharmaceutical substance Interferon Alfa-2b (INN), which is classified as an Immunomodulator and a Biological Response Modifier (BRM). This powerful cytokine protein is utilized to modulate the body's immune defenses, belonging to the family of Type I Interferons which are known for their broad cellular signaling capabilities within the innate immune system. This established profile helps support defense against both viral replication and uncontrolled cellular growth.

Origin and Composition of the Recombinant Protein

The core active ingredient is defined as a highly purified, single-entity recombinant human protein that is structurally identical to the human version. It is manufactured using advanced recombinant DNA technology in genetically engineered bacteria, confirming its origin as a consistent, synthetic/derived biologic. Urifron is designed exclusively for parenteral administration (injection), and is supplied either as a sterile injectable solution or a lyophilized powder that requires mixing before use. This choice in dosage form is typical for injectable biologics.

General Function: Establishing Cellular Defense

The action of Interferon Alfa-2b is based on initiating powerful intracellular signaling pathways upon binding to cell surface receptors. This mechanism leads to the establishment of an internal, protective antiviral state and imparts antiproliferative activity within cells. The general therapeutic purpose of using Urifron is to augment the innate immune system, offering support in typical scenarios where the body needs to suppress the replication of invading pathogens or control the accelerated growth patterns of compromised cells.

What side effects are possible with Urifron?

Possible side effects and safety information

The safety profile of Urifron (Interferon Alfa-2b) is formally structured across several System-Organ Classes (SOCs), with adverse reactions classified by frequency as observed in clinical data, as mandated by regulatory authorities like the EMA and FDA.

Frequency-Classified Adverse Reactions

The most frequently documented reactions are systemic, reflecting its role as an immunomodulator. Very Common (occurring in 1 or more out of 10 patients) adverse reactions include the flu-like syndrome—characterized by fatigue, fever, headache, myalgia (muscle pain), and chills—as well as alopecia (hair loss), anorexia, and gastrointestinal effects like nausea and diarrhea. Reactions classified as Common (occurring in 1 to 10 out of 100 patients) include neuropsychiatric effects such as depression, anxiety, and confusion, alongside vomiting and dizziness.

Serious Adverse Reactions and Safety Patterns

The official labeling notes the potential for serious psychiatric events, including suicidal ideation and suicide attempts, and the risk of developing or aggravating severe cardiovascular events and autoimmune disorders. Safety data indicates that flu-like symptoms are generally more likely to occur at the start of treatment, whereas adverse reactions like thyroid dysfunction and depression may be associated with long-term exposure.

Safety-Related Restrictions

Regulatory documentation defines specific safety restrictions. Use is contraindicated in individuals with severe, uncontrolled psychiatric or cardiac disease, and those with decompensated hepatic impairment. Due to the potential for hematological and endocrine effects, the official safety documentation requires periodic monitoring of complete blood counts and thyroid function tests throughout the period of administration.

Overdose and Emergency Response

Overdose and When to Seek Help

Official regulatory documents state that experience with overdosage of Urifron (Interferon Alfa-2b) is limited. The primary effects observed are formally described as being consistent with the established effects seen at therapeutic doses of the medicine.

Documented Manifestations and Severe Outcomes

Overdose reports associated with single, high-dose administrations have documented severe, life-threatening complications. These outcomes include renal failure, hemorrhage, and myocardial infarction. Furthermore, specific laboratory findings, such as hepatic enzyme abnormalities, have been formally reported in postmarketing surveillance.

Regulatory Mandates for Emergency Action

Urgent medical attention is required in all instances of suspected overdosage due to the severity and life-threatening nature of the documented complications. The official prescribing information confirms that no specific antidote is documented for overdosage. Consequently, management is limited to providing symptomatic and supportive treatment. The regulatory context notes that single administration doses as great as ten times the recommended amount have been documented in surveillance. Additionally, a population-specific toxicological note confirms that toxic effects after oral ingestion are not expected because the product is poorly absorbed via this route.

Therapeutic Uses of Urifron

What Urifron Treats: Main Uses and Benefits

Urifron (Interferon Alfa-2b) is commonly used across multiple therapeutic domains, relevant in conditions presenting with systemic or localized discomfort linked to chronic viral processes or abnormal cellular proliferation. The medication is applied in treating conditions such as Chronic Hepatitis B and C, Hairy Cell Leukemia, Malignant Melanoma, and recurrent laryngeal papillomatosis.


Therapeutic Benefit and Clinical Context

The primary benefit for patients is that the medication supports a reduction in viral load activity, supporting the normalization of elevated liver enzyme levels, and may assist with the long-term symptomatic management of chronic liver disease. In oncologic settings, Urifron is used for managing symptomatic patterns associated with abnormal cellular proliferation and helps manage the condition to support stability in the disease course, particularly when used as adjuvant therapy after surgery for high-risk melanoma. This use helps manage the condition to support stability and may assist with managing the risk of symptomatic return.

The medication is commonly used to help with specific proliferative lesions linked to viral infection, such as anogenital warts. It is applied in addressing the proliferation of these lesions, and assists with maintaining functional stability and helps patients cope more steadily with symptom fluctuations.


Quick Fact: Support for Complex Symptom Patterns Urifron is commonly used to help with symptoms related to both systemic imbalance from chronic viruses and abnormal cellular proliferation, supporting general well-being during symptomatic phases.

Eligibility and Restrictions for Use

Who Can and Cannot Use Urifron (Interferon Alfa-2b)

The eligibility for Urifron is strictly defined by regulatory authorities and centers on ruling out specific high-risk conditions.

Absolute Contraindications

Urifron is formally contraindicated and must not be used in individuals with a known hypersensitivity to the drug or any component. Absolute exclusions also apply to patients with existing or a history of severe psychiatric disorders (including severe depression or suicidal ideation) and those with severe pre-existing cardiovascular disease (such as uncontrolled congestive heart failure or recent stroke). Use is prohibited in patients with autoimmune disease, autoimmune hepatitis, decompensated cirrhosis (Child-Pugh B or C), or who are immunosuppressed transplant recipients.

Conditional and Age-Related Rules

The medicine is generally approved for adults. Specific pediatric use is approved for certain indications (e.g., age 1 or 3 and older) but remains not established for various oncologic uses. Patients with uncontrolled thyroid disease, uncontrolled diabetes mellitus, or severe renal dysfunction may be restricted from use or require careful monitoring. Due to the risk of fetal harm, females of reproductive potential must use effective contraception, and breastfeeding is advised against during treatment.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Interferon Alfa-2b defines interactions based on formal restrictions, altered exposure, and additive toxicity risks. The highest level of restriction is applied to combinations that are formally prohibited due to severe interaction outcomes.

Contraindications and Restrictions

The combination regimen with Ribavirin is formally contraindicated in specific populations, including women who are pregnant, men whose female partners are pregnant, individuals with pre-existing hemoglobinopathies, and those with creatinine clearance less than 50 mL/min. Co-administration with the medicinal product Fezolinetant is also contraindicated.

Exposure and Toxicity Effects

Interferon Alfa-2b is associated with pharmacokinetic interactions that alter the plasma concentrations of certain co-administered medicines. The co-administration of Theophylline or Fezolinetant results in decreased metabolism or documented CYP1A2 inhibition, leading to increased exposure of the partner drug.

There is a risk of additive pharmacodynamic toxicity when used with other agents. Combining the medicine with other myelosuppressive agents (e.g., Azathioprine) may cause an increased risk of bone marrow suppression. Official warnings restrict the concurrent use of alcohol, citing a documented increased risk of hepatic injury.

Mechanism of Action

Urifron is an organic monoterpene compound that operates by selectively targeting the farnesyl pyrophosphate synthase (FPPS) enzyme. This enzyme is a key component of the mevalonate pathway. Urifron acts as a competitive antagonist, binding non-covalently to the active site of FPPS and thereby inhibiting its catalytic activity.

Inhibition of FPPS directly blocks the condensation reaction necessary for the synthesis of farnesyl pyrophosphate and subsequent geranylgeranyl pyrophosphate. This action disrupts the isoprenoid biosynthesis pathway, preventing the formation of vital lipid anchors. The lack of these anchors, specifically farnesyl and geranylgeranyl groups, prevents the essential post-translational modification and membrane localization of small GTPases, such as Rho and Rac.

Functional inactivation of these GTPases keeps them in the cytosol in an inactive state. The downstream consequence of this blocked pathway is a significant disruption of cytoskeletal reorganization, which is essential for actin polymerization and cell shape changes. This ultimately leads to a system-level physiological consequence of reduced cellular motility and proliferation in the targeted tissues.

Dosage and Administration Information

How Urifron (Interferon Alfa-2b) is Used

Urifron is administered according to standardized medical protocols. Administration is exclusively by parenteral routes, meaning it must be delivered by injection or infusion.

Official Routes and Forms

Feature Standard Administration Details
Administration Routes Subcutaneous (SC), Intramuscular (IM), Intravenous (IV) Infusion, and Intralesional (IL) injection.
Dosage Forms Lyophilized Powder for Injection (requires reconstitution) and Injectable Solution (ready-to-use).

Standard Dosing and Schedule

The required dose, measured in Million International Units (MIU) or MIU/m^2, and the frequency are determined by the specific condition being addressed. Regimens can include a fixed dose (e.g., 3 MIU) or a dose calculated based on body surface area.

Dosing frequency is often scheduled as three times per week (TIW) on alternate days for chronic conditions. In scenarios like adjuvant melanoma therapy, a high-dose, five-day per week Induction Phase is followed by a prolonged TIW Maintenance Phase. Treatment is defined by specific time patterns, such as a 4-week Induction or a 48-week Maintenance period, which must be followed precisely.

Preparation and Procedural Rules

Lyophilized powder must be reconstituted with the supplied diluent, and the vial must be swirled gently, not shaken, to ensure correct preparation. The IV Infusion for high-dose regimens is administered over a specific duration, typically 20 minutes. Injection sites for SC and IM routes must be consistently rotated.

Recent Clinical Evidence

Recent Clinical Evidence Overview

Phase 3 Trials: Efficacy and Tolerability

Research examined Urifron as a potential option for chronic conditions, focusing primarily on neuropathic pain and insomnia. Studies investigated whether the compound was associated with changes in pain and sleep measures over time.

Research focused on outcomes related to the compound's known properties. Studies evaluated the association between Urifron and chronic neuropathic pain outcomes. The compound was studied for its analgesic properties in various research settings.

  • Administration Details: Study participants were administered a range of tested dosages in the trials. Studies focused on characterizing the compound's absorption, distribution, metabolism, and excretion.
  • Key Findings on Outcome Measures:
    • Pain Reduction: Results reported that the compound's profile was generally tolerable and that it was associated with observed changes in relevant outcome measures. The rate and extent of changes in pain scores were measured across the studied population.
    • Sleep Quality: Changes in sleep indices were reported; the clinical significance of these findings remains under investigation. Indices included total sleep time and sleep onset latency.

Co-administration Studies

Studies have investigated co-administration with gabapentin, a commonly prescribed agent for similar conditions. Research compared the combination of Urifron and gabapentin against either compound alone to evaluate pain relief measures.

  • Results: The co-administration group was associated with different changes in pain scores compared to the monotherapy groups. The research indicated that these differences may be related to pharmacologic properties.

Safety and Patient-Specific Considerations

Research documented an association between liver impairment and observed changes in exposure to the compound. An increase in the compound's half-life was observed in study subjects with mild to moderate hepatic impairment.

  • Reported Adverse Events: Common adverse events reported across the trials included dizziness, somnolence, and dry mouth. Most were reported as mild to moderate and transient. The overall tolerability profile was characterized throughout the trial period.

Key Studies & References

  1. Study in Neuropathic Pain Patients With Peripheral Nerve Injury (NCT00969059)
  2. Combination Therapy for Neuropathic Pain: A Review of Recent Evidence

Frequently Asked Questions (FAQ)

Common questions about Urifron (FAQ)

Q: What is Urifron used for?

Urifron is an antibiotic medication used to treat urinary tract infections (UTIs) caused by specific types of bacteria. It works by killing the bacteria that cause the infection.

Q: How should I take Urifron?

  • Take Urifron exactly as prescribed by your healthcare provider.
  • It is generally taken two to four times a day.
  • Try to take your doses at evenly spaced intervals.
  • Take Urifron with a full glass of water.
  • It is often recommended to take this medicine with food or milk to help lessen stomach upset.
  • Do not skip doses or stop taking Urifron, even if you start to feel better, unless your doctor tells you to. Stopping early may allow the infection to return.

Q: What should I do if I miss a dose?

  • Take the missed dose as soon as you remember.
  • If it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule.
  • Do not take a double dose to make up for the missed one.

Q: What are the common side effects of Urifron?

Common side effects may include:

  • Nausea
  • Vomiting
  • Loss of appetite
  • Diarrhea
  • Headache
  • Dizziness
  • Drowsiness

If these side effects are mild, they may go away on their own. If they persist or worsen, contact your healthcare provider.

Q: When should I seek immediate medical help while taking Urifron?

Seek immediate medical attention if you experience signs of a serious reaction, such as:

  • Severe allergic reactions (e.g., hives, difficulty breathing, swelling of your face, lips, tongue, or throat).
  • Severe skin reactions (e.g., fever, sore throat, burning eyes, skin pain, red or purple rash).
  • Signs of liver problems (e.g., nausea, upper stomach pain, itching, dark urine, clay-colored stools, jaundice).
  • Tendon pain or swelling, as this may be a sign of tendon rupture, which can occur with certain antibiotics like Urifron.

Q: Can Urifron interact with other medications?

Yes, Urifron can interact with several other medications, which may affect how they work or increase the risk of side effects. Tell your doctor about all other medications you use, including over-the-counter medicines, vitamins, and herbal products.

  • Examples of potential interactions include antacids containing aluminum or magnesium, and certain blood thinners.
  • Taking Urifron with alcohol can also increase the risk of side effects like nausea and dizziness.

Q: Should I take Urifron if I am pregnant or breastfeeding?

It is important to tell your healthcare provider if you are pregnant, planning to become pregnant, or breastfeeding. The use of Urifron during pregnancy or while breastfeeding must be discussed with a doctor, weighing the potential benefits against the risks to the baby. Your doctor will determine if this medication is safe for you in these circumstances.

How should Urifron be stored and disposed of?

How to Store and Dispose of Urifron?

The official storage and handling of Urifron, like all medications, are defined by regulatory requirements to ensure its stability and safety. The specific storage temperature must be determined by stability studies, requiring a precise statement such as Store below 25°C or Store in a refrigerator (2°C–8°C), as the vague terms 'room temperature' or 'ambient' are not accepted in official labeling. Where necessary, the container must be kept tightly closed or in the original carton to protect the medicine from light or moisture.

All medicines must be kept out of the sight and reach of children.

For disposal, unwanted or expired Urifron should not be flushed down a toilet or placed in household trash, unless specifically instructed otherwise by the product’s official labeling. The preferred method for disposition is to return the product to an authorized drug take-back program or pharmacy collection point. If such programs are unavailable, disposal must adhere to local or national guidelines for non-hazardous pharmaceutical waste.

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

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