INF

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Medically reviewed

Rosario Oropesa

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 INF

Quick Facts

Property Description
Active Ingredient Interferon Alfa-2b (Recombinant)
Form Injectable solution or lyophilized powder
Pharmacological Class Immunomodulator, Antiviral, Antiproliferative agent
Origin Biotechnology-derived (Recombinant protein)

What Type of Medicine is INF (Interferon Alfa-2b)?

INF is a specialized, prescription biologic medicine whose active component, Interferon Alfa-2b, is a specific Type I Interferon protein. This drug is categorized as both an Immunomodulator and a Cytokine. The medicine is biotechnology-derived; it is a recombinant protein manufactured to be structurally identical to the Human Leukocyte Interferon A naturally produced by the human immune system. This preparation is clinically recognized for its role in modifying biological responses in therapeutic settings.

Composition and Form: The Recombinant Protein

The medicine is a single active ingredient product centered on the highly purified Interferon Alfa-2b protein. This biological substance is generally presented as a sterile injectable solution or a lyophilized powder intended for reconstitution. Due to the inherent instability of protein molecules, this medicine is designed for parenteral administration via injection, which ensures the active component bypasses the digestive system and reaches systemic circulation intact. The formulation provides the necessary stability for this large-molecule therapeutic agent.

The General Purpose of This Biological Response Modifier

The primary function of INF is to actively enhance and regulate the body’s innate cellular defense systems. This biological response modifier operates by engaging specific cell surface receptors, thereby strengthening the immune response and helping to establish a cellular antiviral state against infectious agents. Moreover, the medicine functions as an Antiproliferative agent. This property shows the medicine's utility in supporting the management of conditions marked by excessive or abnormal cell growth.

Regulatory References

  1. Immunomodulator and a Cytokine

What side effects are possible with INF?

Possible Side Effects and Safety Information for INF

INF is associated with a range of reported adverse reactions, spanning various organ systems. The profile is primarily defined by the potential for serious infections and hematologic abnormalities.

Common and Very Common Adverse Reactions

Adverse reactions observed frequently (in more than 1 in 10 people, or very common) or commonly (in 1 in 10 to 1 in 100 people) include:

  • General: Fever, fatigue, headache, and reactions at the injection site (e.g., pain, redness).
  • Infections: Infections are the most frequent risk, typically involving the respiratory and urinary tracts.
  • Blood and Lymphatic System: Neutropenia (low white blood cell count) and anemia.
  • Gastrointestinal: Nausea, vomiting, and diarrhea.

Serious and Clinically Significant Safety Concerns

The most critical safety risks for INF therapy, as highlighted in regulatory documentation, include:

  • Severe Infections: Infections can become severe, sometimes leading to fatal outcomes. Careful screening for pre-existing or latent infections, such as tuberculosis, is necessary prior to treatment.
  • Severe Hematologic Toxicity: Profound drops in blood cell counts, including severe neutropenia and, rarely, aplastic anemia, have been reported. Regular monitoring of blood counts is a standard safety requirement.
  • Immune System Reactions: Rare, severe hypersensitivity reactions, including anaphylaxis, can occur. Other reported events involve cardiovascular effects (e.g., cardiomyopathy) and the development of autoimmune disorders.

Restrictions and Monitoring

INF is contraindicated in individuals with a known severe allergy to the drug or its components. Caution and close monitoring are necessary for patients with pre-existing conditions like severe cardiac disease or uncontrolled seizure disorders. The occurrence of certain severe adverse reactions may require dose modification or immediate discontinuation of treatment. These established safety parameters ensure the risks associated with INF are systematically managed throughout the course of therapy.

Overdose and Emergency Response

Overdose and when to seek help: Official Regulatory Information for Interferon

Interferon (INF) overdose information is primarily defined by the exaggeration of known, dose-related toxicities, rather than a unique overdose syndrome. Acute administration of supratherapeutic doses or chronic high-dose exposure typically leads to intensified adverse reactions, which are generally reversible upon stopping the medication.

Documented Overdose Manifestations

System Documented Manifestation
Neuropsychiatric Severe depression, suicidal ideation, confusion, and fatigue.
Hematologic Severe myelosuppression, including significant reductions in neutrophils and platelets.
Hepatic Worsening of liver function (hepatic decompensation).

Required Emergency Actions

The most important regulatory action in the event of a suspected overdose is the immediate withdrawal (discontinuation) of the INF product. Since no specific antidote is available for Interferon overdose, management is entirely symptomatic and supportive. This includes close observation and monitoring of key clinical and laboratory parameters, such as complete blood counts and liver function tests.

When to Seek Immediate Medical Help

Patients must seek urgent medical attention for any new, persistent, or worsening signs of serious toxicity, including profound mood changes, unexplained bleeding, or severe fatigue, as these can escalate to life-threatening complications.

Therapeutic Uses of INF

What INF Treats: Main Uses and Benefits

The therapeutic role of INF (Interferon Alfa-2b) is utilized in clinical practice, including its use in managing chronic viral disease and specific malignancies. This medicine is commonly used across conditions presenting with periods of heightened physiological stress.

It is applied across multiple domains, most commonly for chronic Hepatitis B and C, certain blood cancers like Hairy Cell Leukemia and Follicular Lymphoma (high-tumor-burden), as well as AIDS-related Kaposi's Sarcoma, and as adjuvant therapy for high-risk malignant melanoma. The treatment is applied in addressing conditions marked by increased discomfort related to high viral load or uncontrolled abnormal cell growth.

The primary goal is to provide support that assists the patient in managing a state of disease control. This may be relevant in contexts involving heightened systemic burden and supports the patient during difficult symptomatic phases.


Quick Fact: Support for Systemic Stability

Domain Benefit Statement
Viral Clearance Is relevant for managing symptoms that may become more disruptive during the course of chronic viral infections.
Oncology Contributes to easing the overall symptom load and assists with maintaining functional stability.

Regulatory References

  1. NIH MedlinePlus Drug Information

Eligibility and Restrictions for Use

The eligibility for Interferon Alfa-2b (INF) is strictly defined by government regulatory agencies and based on pre-existing patient conditions and age.

Populations for Whom Use is Allowed

Use is approved for adult patients across all labeled indications. For children and adolescents, the use is established for certain viral conditions (e.g., chronic hepatitis C) in those aged 3 years and older, provided they have compensated liver disease.

Absolute Contraindications (Who Must Not Use INF)

Official labeling contraindicates INF use in patients with:

  • Known hypersensitivity to the active substance or excipients.
  • Existence of or history of severe psychiatric disorders, including severe depression or suicidal ideation.
  • Decompensated liver disease (Child-Pugh B or C) or autoimmune hepatitis.
  • Severe pre-existing cardiovascular disease (e.g., uncontrolled congestive heart failure, severe arrhythmias, recent stroke).
  • Severe renal impairment (creatinine clearance less than 50 mL/min) when used in combination with ribavirin.

Restricted or Conditional Use

Use is not recommended during pregnancy (contraindicated in combination therapy) or lactation. Safety and efficacy have not been established in children under the age of three. Older adults may be treated, but require closer monitoring due to potential underlying comorbidities.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The regulatory profile for Interferon Alfa-2b (INF) details specific interaction patterns across pharmacokinetic and pharmacodynamic domains, requiring mandatory precautions.

Contraindicated Combinations and Restrictions

Co-administration with Ribavirin is formally contraindicated in specific patient populations. These restrictions include patients with severe renal dysfunction (creatinine clearance less than 50 mL/min) and during pregnancy, a restriction that applies to both female patients and the female partners of male patients. Separately, the official label advises patients to avoid the consumption of alcohol due to a documented increased risk for hepatic injury during therapy.

Drug-Drug Interaction Patterns

A significant pharmacokinetic interaction is the potential for Interferon Alfa-2b to inhibit the hepatic enzyme Cytochrome P450 1A2 (CYP1A2). This action may reduce the clearance of co-administered drugs that are substrates for this enzyme, leading to an increased plasma concentration and systemic effect of the co-medication. Medicines such as Theophylline and Fezolinetant are noted in the regulatory documents to be affected by this decreased clearance, as is Zidovudine.

Official labeling also documents pharmacodynamic interactions where co-administration increases the risk of specific toxicities. The use of INF with other myelosuppressive agents heightens the risk of excessive myelosuppression. Similarly, combining INF with central nervous system (CNS) active drugs, such as narcotics, hypnotics, or sedatives, increases the risk of excessive CNS toxicity.

Mechanism of Action

Neutralizing the TNF-α Signaling Messenger

INF is a selective antibody that acts as an antagonist by binding directly to the protein Tumor Necrosis Factor-alpha (TNF-α) . This targeted interaction neutralizes TNF-α, preventing this key inflammatory messenger from activating its specific receptors on immune and tissue cells. This foundational molecular step results in the modulation of subsequent inflammatory pathway activity.


Modulating the Inflammatory Cascade

By blocking TNF-α, INF interrupts the downstream signaling cascade. This interruption limits the subsequent production of other inflammatory chemicals (cytokines and chemokines). This mechanism leads to a systemic dampening of the inflammatory process and decreased propagation of inflammatory signals in tissues. This reduced signaling consequently lowers the cues that cause immune cells (e.g., T-cells and macrophages) to migrate and accumulate excessively, resulting in a decrease in local tissue inflammation and alteration of structural changes associated with high immune cell presence.

Dosage and Administration Information

How INF is Administered: Administration Process

INF is a prescription medication administered exclusively by intravenous (IV) infusion by a healthcare professional in a clinical setting. The procedure follows established protocols for preparation, dosing, and administration timing to ensure proper use.


Administration Details

Attribute Instruction
Route of Administration Intravenous (IV) Infusion
Infusion Duration No less than 2 hours (120 minutes)
In-line Filter Use Mandatory; a 0.2 micron or 1.2 micron filter must be used
Diluent 0.9% Sodium Chloride Injection, USP

Dosing Schedule

Administration of INF begins with an initial loading phase, followed by a maintenance schedule. The standard dose for both adult and pediatric patients (6 years and older) is based on body weight.

  • Standard Dose: 5 mg/kg body weight.
  • Initial Schedule: The first three infusions are given at Week 0, Week 2, and Week 6.
  • Maintenance Schedule: Infusions are then typically given every 8 weeks thereafter.

In specific instances of loss of response, the physician may increase the dose to 10 mg/kg or shorten the interval to every 6 weeks, based on prescribing information.

Procedure for Missed Doses

If a dose is missed, contact the prescribing physician immediately. The medication should be administered as soon as possible, and the patient will then continue the prescribed schedule from that subsequent administration point.

Preparation and Mixing

The medication is supplied as a lyophilized powder and must be reconstituted and then diluted by a trained professional before use. The powder is reconstituted with Sterile Water for Injection, USP, and the vial should be swirled gently, not shaken. The final diluted solution is then administered using the correct in-line filter over the required time period.

Recent Clinical Evidence

Research Evidence: Overview of Studies for Isavuconazole


Evidence for use in Invasive Aspergillosis (IA)

Isavuconazole was studied for Invasive Aspergillosis (a serious fungal infection) primarily through trials that involved a research design that included a comparator group. These were structured as randomized, controlled trials, and designed to explore the measurement of all-cause mortality and overall treatment response. The main outcomes measured included all-cause mortality at defined time points, such as 42 and 84 days, and the overall treatment response, which was monitored using combined criteria. These studies were applied in research contexts focused on adults who had documented or probable IA.

Studies monitored all-cause mortality across specific time points and described patterns monitored in the rates of overall treatment response. The research examined the types and frequencies of adverse events and the proportion of participants requiring treatment discontinuation. These reports contribute to the broader evidence landscape by providing insight into short-term changes.

Evidence for use in Invasive Mucormycosis (IM)

Isavuconazole was evaluated in studies for Invasive Mucormycosis. These were largely prospective, non-comparative studies, meaning they were not designed to include a comparator treatment group. The research was evaluated in patient cohorts where prior antifungal treatments were used or not tolerated. Researchers examined outcomes related to systemic or functional imbalance, primarily focusing on all-cause mortality at defined intervals and overall patient response.


Long-term Studies and Follow-up

Long-term effects are not fully established beyond the initial assessment periods. Evidence is limited concerning the durability of the observed outcomes over many months or years. There is limited information for long-term outcomes that may arise after the conclusion of the formal study period.


What is Still Uncertain About Isavuconazole Research

Comparative evidence is lacking for Invasive Mucormycosis, and follow-up durations were limited for both indications. Exploratory findings related to systemic or functional imbalance in the younger population are still emerging. This evidence structure highlights what is known — and what is still uncertain — about the use of isavuconazole in a research setting.

Key Studies & References

  1. CRESEMBA (isavuconazonium sulfate) Full Prescribing Information
  2. FDA Approves Expanded Use of CRESEMBA® (isavuconazonium sulfate) in Children with Invasive Aspergillosis and Invasive Mucormycosis

Frequently Asked Questions (FAQ)

Common questions about INF (FAQ)


Q: Do I need to change my diet while taking INF?

Official product information advises patients to avoid the consumption of alcohol while using this product. This caution is advised because combining INF with alcohol may increase the risk of liver injury. No other general dietary modifications are specifically defined in the regulatory documents.


Q: Is it common to feel different right after starting INF?

Yes, some people experience reactions during or shortly after the infusion, known as infusion reactions. These reactions are usually monitored by a healthcare professional in the clinic and may include symptoms such as fever, chills, itching, chest pain, or changes in blood pressure. The official label notes these as potential side effects.


Q: Can INF cause problems if I have a pre-existing liver condition?

Official documentation notes that liver problems, including rare but serious cases of liver damage and the reactivation of Hepatitis B, have been reported with INF. For this reason, official guidance states that patients should be assessed for underlying liver conditions, including Hepatitis B infection, before beginning treatment and monitored during therapy.


Q: Does INF have a warning about driving or operating machinery?

Caution is generally advised regarding driving or operating machinery following an infusion of INF. Official documents note that some temporary effects, such as dizziness or changes in vision, have been reported after administration.


Q: Is INF safe to take with common over-the-counter pain relievers?

The official product label details known drug interactions involving certain liver enzymes and medicines that affect blood cell counts or the central nervous system. Specific warnings regarding common, non-prescription pain relievers are not defined, but questions regarding non-prescription pain relievers can be reviewed with a healthcare professional.


Q: Can INF cause changes in mood or sleep?

The official label reports cases of neurologic reactions and states that combining INF with certain central nervous system (CNS) active drugs increases the risk of side effects. While mood or sleep changes are not specifically called out as common effects of INF alone, it is appropriate to discuss any unusual changes with a healthcare professional.


Q: Is INF addictive?

No. INF is classified as an antibody that works by targeting the inflammatory protein TNF- alpha. It is not an opioid, depressant, or stimulant, and no regulatory warnings classify it as having addictive potential.


Q: Does the effectiveness of INF wear off over time?

Regulatory documents describe a phenomenon called 'loss of response' in some patients who have been using the medication for a period of time. The official prescribing information notes that physicians may consider adjusting the dosage or the interval between infusions for patients who experience this.


Q: What happens if a person who is pregnant uses INF?

Official guidance notes that INF is known to cross the placenta, mainly during the late second and third trimesters. For infants exposed to INF in the womb, official recommendations advise that live vaccines should be postponed until the infant's serum levels of the medication are undetectable, which may take up to six months after birth.


Q: Is INF safe for people with kidney problems?

Regulatory documentation indicates that INF has not been specifically studied in patients with kidney impairment. Because of this, no specific dosing recommendations for this population can be made based on the current official product data.


Q: Will I need regular blood tests while on INF?

Yes. Official documentation advises mandatory testing for conditions like latent tuberculosis and Hepatitis B virus (HBV) before treatment begins. Ongoing monitoring for the reactivation of HBV and for hematologic reactions (low blood cell counts), which typically involve blood testing, is also recommended.


Q: Does INF interact with common cold or allergy medications?

The official label notes interactions with medicines that affect the Central Nervous System (CNS). Because some cold and allergy medications contain components that affect the CNS, questions about all medications, including over-the-counter products, can be reviewed with a healthcare professional.


Q: What should I tell my dentist before a procedure if I am taking INF?

The regulatory profile highlights an increased risk of serious infections. Sharing information about all medications with a healthcare provider is a standard step before medical procedures, particularly those that carry a risk of infection.


Q: What is the difference between the generic and brand name versions of INF?

INF is a type of medicine known as a biologic (an antibody). It is available as the original brand-name product and through highly similar versions called biosimilars. Biosimilars are approved based on evidence that they have no clinically meaningful differences in terms of safety and effectiveness from the original brand product.


Q: Does INF require a special prescription or monitoring program?

INF is an intravenous prescription medication administered only by a healthcare professional in a clinical setting and requires monitoring for infusion reactions. Official documents require mandatory screening for certain infections, like TB and Hepatitis B, before treatment begins.


Q: How long does INF stay in your system after stopping it?

The median terminal half-life of INF is approximately 7.7 to 9.5 days. This means that it can take several weeks for the medication to be substantially cleared from the body.


Q: Are there certain activities or environments to avoid while taking INF?

Official information advises patients to avoid live vaccines during treatment with INF. Additionally, reports of rash occurring on sun-exposed areas of the body suggest caution is needed with prolonged or intense sun exposure.


Q: Is it true that INF can cause [specific, common online rumor]? (e.g., hair loss)

Official reports indicate that hair loss (alopecia) has been reported in post-marketing surveillance for this product. Changes such as hair loss can be discussed with a healthcare professional for evaluation, as the cause may be complex, potentially relating to the medication or the underlying inflammatory condition being treated.


Q: Can INF be used by people with autoimmune conditions?

Yes. INF is approved for use in several conditions that are classified as autoimmune and inflammatory diseases, such as Rheumatoid Arthritis and Ulcerative Colitis. Its purpose is to modulate and dampen the immune system's inflammatory response.


Q: What should I do if I think I have an interaction with INF?

Official patient information notes that if a patient develops any unusual symptoms or signs that may suggest a serious reaction or interaction, it is appropriate to contact their prescribing physician.


Q: Are there variations in how INF works for different people?

Yes. The official dosing schedule includes provisions for patients who experience a 'loss of response' to the standard dose over time. This indicates that individual responses to the treatment can vary.


Q: Is it possible to be allergic to INF?

Yes. The official warnings and precautions section reports that severe hypersensitivity reactions, including anaphylaxis, have been reported with INF. A previous severe reaction to the product is listed as a contraindication (a reason the drug should not be used).


Q: What kind of research has been done on INF?

The clinical trials used to support the approval of INF have included a variety of study designs. This research typically includes randomized, controlled studies for conditions like Crohn's disease and rheumatoid arthritis, along with other types of research for specific patient populations.


Q: Are there any published studies that compare INF to placebo?

Yes. The clinical study sections in the regulatory documents for the approved indications (such as Crohn's Disease and Rheumatoid Arthritis) describe trials that included placebo groups to compare the effects of INF.


Q: Is INF a biologic drug?

Yes. INF is classified as a biologic medicine. Specifically, it is a chimeric monoclonal antibody, which is a complex molecule produced using living cells that is designed to target the TNF- alpha protein.


Q: Why is it important to keep using INF even if I feel better?

INF is approved for inducing a response and then for the long-term maintenance of that response in many inflammatory conditions. The dosing schedules are designed to sustain the therapeutic effect, indicating its importance beyond the initial phase of feeling better.


Q: Are there any patient assistance programs for INF?

Information regarding patient access and affordability is available. Resources such as patient assistance programs are often available to help people access their medication.

How should INF be stored and disposed of?

How to Store and Dispose of INF (Interferon Alfa-2b)

Official regulatory documents define strict environmental controls for storing this sensitive medicine. The product must be stored under refrigeration at a temperature between 2 C and 8 C (36 F and 46 F).

Mandatory Storage Constraints:

  • Do not freeze the medicine.
  • Protect the product from light by keeping it in the original carton.
  • Keep the medication and all related supplies out of the sight and reach of children.

Handling and Disposal

Item Requirement
In-Use Stability Once reconstituted, the solution must be used or discarded according to the specific time limits noted on the labeling (e.g., within 24 hours or up to 28 days for multi-dose pens), even when refrigerated.
Sharps Disposal Used needles, syringes, and vials must be placed immediately into an FDA-cleared sharps disposal container.
Waste Rules Disposal of all unused or expired medicine must comply with local and state regulations.

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

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