Imunovir

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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 Imunovir

Property Description
Active ingredient Inosine Pranobex
Form Tablet, Syrup, Oral Solution
Pharmacological class Immunomodulator, Antiviral agent
Common use Supporting immune function against viral challenges
Origin Synthetic compound

What Type of Medicine is Imunovir (Inosine Pranobex)?

Imunovir is a prescription medication containing the active ingredient Inosine Pranobex, which is a synthetic purine derivative recognized for its immunomodulatory and antiviral properties. The drug is classified under the Anatomical Therapeutic Chemical (ATC) system as an Antiviral for systemic use (J05AX05). This dual classification reflects the drug's intended action: to both interfere with viral replication and enhance the body's deficient cell-mediated immune responses. The medication is widely clinically recognized for its intended role in providing comprehensive support to the immune system.

Composition and Available Forms

The therapeutic effect is derived from the Inosine Pranobex complex, a specific chemical union of components in a defined ratio. The active ingredient is structurally related to natural purine molecules in the body. The compound has been shown to enhance T-lymphocyte function, which are critical cells in the body's immune defense. This indicates that the medicine is confirmed to work by strengthening the specific white blood cells necessary for fighting infections. Imunovir is intended solely for oral administration and is supplied in both solid tablets and a liquid syrup or oral solution form, specifically to suit various patient needs, including pediatric patients who require liquid preparations. Popular formulations with this same ingredient are sometimes known under the brand name Isoprinosine in certain regions.

General Purpose and Therapeutic Action

The general purpose of this medication is to bolster the host's internal defense mechanisms when they are challenged by infection. Inosine Pranobex achieves this by helping to regulate the production of immune signaling molecules like cytokines and supporting the proliferation of immune cells. This action makes it typically suitable for scenarios where a patient requires support for their immune system to better manage a viral load. This combined supportive and inhibitory action is the fundamental therapeutic benefit, designed to provide comprehensive aid intended to improve the body's ability to overcome a viral challenge.

What side effects are possible with Imunovir?

Possible Side Effects and Safety Information

The safety profile of Inosine Pranobex is officially documented based on clinical studies and post-marketing surveillance, classifying potential effects by frequency and the body system affected, according to regulatory standards.


Official Adverse Reactions and Frequency

The most frequently documented reactions are classified as Very Common (affecting 1 in 10 or more people). This category is dominated by effects on Metabolism and Nutrition disorders, specifically a transient increase in uric acid concentration in both the plasma and urine. This effect is regulatory noted to return to baseline shortly after treatment discontinuation.

Side effects classified as Common (affecting 1 to 10 people in 100) are noted across several system-organ classes:

  • Nervous system disorders may include headache and dizziness.
  • Gastrointestinal disorders are associated with nausea, vomiting, diarrhoea, and abdominal discomfort.
  • Skin and subcutaneous tissue disorders can involve rash and pruritus.
  • General systemic effects often encompass fatigue and malaise.

Adverse effects where the frequency cannot be estimated (Not known) include serious reactions such as anaphylactic reactions, angioedema, and urticaria.


Safety Constraints and Considerations

Safety constraints primarily focus on the compound's metabolic effects. The medication is contraindicated in individuals with known hypersensitivity to the active ingredient or excipients, or in patients experiencing an acute attack of gout or with markedly increased uric acid plasma concentrations. Due to the effect on uric acid, caution is necessary for patients with a history of hyperuricaemia or gout, and also for use in patients with renal impairment.

Overdose and Emergency Response

Overdose and When to Seek Help — Official Regulatory Information for Imunovir

Overdose Scope

Official regulatory documents state that no experience of overdosage with Imunovir has been reported in human clinical trials or post-marketing surveillance. Based on studies in animals, serious adverse effects are considered unlikely, with the primary expected physiological effect being an increase in uric acid levels in the blood and urine.

This transient elevation of uric acid is the only consistently observed drug-related effect, which typically remains within the normal range and returns to baseline within a few days after treatment ends. However, hyperuricemic levels have been observed in studies at daily doses of 3 grams or more, particularly in males and the aging population.

Required Emergency Actions

If you take more Imunovir than the prescribed dose, you should call the Doctor for advice. Treatment for a potential overdose is generally restricted to symptomatic and supportive measures to manage any signs or symptoms that may occur.

It is advised to get medical care right away if an overdose is suspected, even if you do not feel unwell. When seeking urgent medical attention, be prepared to provide details about the amount of medicine taken and when the exposure occurred.

Therapeutic Uses of Imunovir

What Imunovir Treats: Main Uses and Benefits

Imunovir (Inosine Pranobex) is commonly used to provide symptomatic support and assistance in managing specific viral-driven conditions. The drug is commonly used to help with conditions characterized by episodic or fluctuating manifestations such as herpes simplex virus (HSV), human papilloma virus (HPV), and symptoms associated with acute respiratory infections. It is applied across domains where additional symptomatic support is needed for recurring or distressing symptoms that interfere with comfort and daily stability.


Easing Discomfort from Recurrent Viral Outbreaks

This domain covers symptoms related to physical discomfort and lesions associated with conditions involving episodic manifestations, such as cold sores and certain viral warts. The medication supports the patient during these flares. For many users, the medication “may assist with easing the pain, burning, and itching of acute outbreaks and may assist with easing the overall symptom load.” This support is relevant in clinical settings marked by temporary physiological imbalance where symptomatic assistance is needed to maintain functional stability.


Managing Symptoms Associated with Frequent or Persistent Viral Issues

Imunovir is commonly applied in clinical settings where patients experience symptom clusters that may become intense or disruptive, such as recurrent upper respiratory tract infections or prolonged symptoms related to systemic imbalance (e.g., fatigue) following viral illness. The goal is to offer symptomatic assistance that helps ease the overall symptom burden and assists with maintaining functional stability during periods of heightened symptom activity.

“Applied across domains where additional symptomatic support is needed.”

Quick Fact: Relief for Physical Discomfort The medication is relevant for managing symptoms that interfere with daily comfort during periods of acute or episodic changes.

Eligibility and Restrictions for Use

Who Can and Cannot Use Imunovir?

The population eligibility for Imunovir (Inosine Pranobex) is strictly defined by regulatory authorities based on pre-existing medical conditions and physiological status. The medicine is contraindicated for specific groups due to its metabolism to uric acid and the risk of hypersensitivity.


Contraindications and Restrictions

Population Status Regulatory Classification
Absolute Contraindication Patients with gout or existing hyperuricemia (high uric acid levels).
Patients with a known hypersensitivity to inosine pranobex or any excipients.
Not Recommended/Restricted Pregnant and breastfeeding women due to insufficient human safety data.
Conditional Use/Caution Patients with renal impairment (kidney problems) or a history of kidney stones (urolithiasis).

Age-Group Eligibility

The medicine is generally established for use in adults and adolescents. Use in children requires specific dosage based on weight, with the medicine typically not recommended for those under the age of one year. Older adults are permitted to use the medicine but should be monitored for pre-existing conditions, particularly kidney function.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

The regulatory profile for Imunovir (Inosine Pranobex) outlines specific interaction constraints based on its immunomodulatory properties and metabolism as a purine derivative.


Official Interaction Statements

Classification Interacting Agents Official Restriction or Outcome
Contraindicated Combination Immunosuppressive Agents Co-administration is strictly prohibited; the drug must be administered after the immunosuppressive agent, not concomitantly, to avoid antagonistic effects.
Use with Caution Uric Acid-Affecting Agents (e.g., Xanthine Oxidase Inhibitors, Uricosuric Agents) Imunovir raises plasma uric acid levels, which may antagonize the action of these medicines.
Use with Caution Diuretics (e.g., Thiazides, Loop Diuretics) There is a risk of increased plasma uric acid levels due to an officially documented additive hyperuricaemic effect.
Exposure Modification Zidovudine (AZT) Co-administration results in an officially documented increase in AZT's effect, stemming from increased plasma bioavailability.

Product Component Constraint

Imunovir tablets contain wheat starch, which results in a usage restriction for individuals with a documented wheat allergy.

These constraints define the official limits of co-administration. Regulatory documents describe the interaction structure based on preventing antagonism with immunosuppressants and managing additive effects with uric acid-affecting agents.

Mechanism of Action

Mechanism of Action (MoA)

Imunovir's complex mechanism is defined by three primary intracellular effects. The compound modulates the transcription of specific immune-response genes, which results in altered T-lymphocyte differentiation and downstream effects on cytokine synthesis.

Secondly, the compound demonstrates a direct antiviral action by interacting with viral RNA to inhibit the assembly of new viral particles within the host cell, thus interfering with viral replication. Additionally, the complex functions as an inhibitor of the enzyme inosine 5'-monophosphate dehydrogenase (IMPDH). This enzymatic inhibition alters the intracellular guanosine nucleotide pool, which is essential for certain viral processes and subsequent nucleic acid synthesis. This combined activity leads to systemic immunomodulation and antiviral interference at the cellular level.

Dosage and Administration Information

How to Use Imunovir

The administration of Imunovir (Inosine Pranobex) follows established protocols to ensure consistent and proper use. The medicine is strictly approved for oral use and is supplied primarily as a tablet, syrup, or oral solution.


Official Dosing and Frequency

Usage Parameter Regulatory Guideline
Route of Administration Oral use only.
Adult Daily Dose Typically 3 g per day, divided, based on a 50 mg/kg calculation. The dose may be increased up to 4 g daily.
Children's Dose Calculated strictly by body weight, usually 50 mg/kg per day, divided into 3 to 4 doses.
Frequency The total daily dose is divided into 3 to 4 equal portions, administered during waking hours.

Administration and Course Duration

For practical administration, Imunovir tablets may be crushed and dissolved in a small amount of liquid to facilitate ingestion. The tablets can be taken with or without food. It is a procedural requirement that the score-line present on the tablet is solely intended to assist in swallowing and is not to be used for dividing the dose into unequal halves.

Treatment duration is typically short-term, generally 5 to 14 days for acute uses. Treatment must continue for 1 to 2 days after clinical symptoms have subsided to ensure the completion of the course. For chronic conditions like Subacute Sclerosing Panencephalitis (SSPE), long-term, extended treatment is required. Older adults follow the same dosing regimen as the standard adult dose.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Imunovir

Evidence for Use in Recurrent Herpes Simplex Virus (HSV) Infections

Research examined patterns related to Inosine Pranobex, primarily using Randomized Controlled Trials (RCTs). These studies explored outcomes related to time until resolution of acute symptoms and tracked recurrence rates. Findings were mixed regarding outcomes for preventing future recurrences over an intermediate duration, with some data showing patterns similar to those observed with comparator agents. Long-term effects are not fully established, as follow-up durations were limited in many studies.


Evidence for Use in Human Papillomavirus (HPV) Infections

The evidence base was evaluated in relation to HPV-related conditions (e.g., genital warts, cervical changes), often in Clinical Trials and Observational Studies as an adjunctive treatment alongside local therapies. Studies monitored key outcomes describing episodic changes, specifically the measurement of lesion evolution and viral detection patterns. Findings describing changes in viral detection patterns were observed in studies where the medication was associated with standard therapy. The independent effect of the medicine without co-therapy is not fully established, and evidence is limited for long-term outcomes.


Evidence for Use in Acute Respiratory Viral Infections (ARIs)

Inosine Pranobex was studied for its use in managing symptoms associated with acute viral infections, typically in Phase 4 Randomized, Placebo-Controlled Trials. In one key trial, the primary measurement of time to overall symptom resolution did not show a distinct pattern compared to the placebo group. However, secondary analyses of specific subgroups, such as otherwise healthy adults under 50 years old, showed related patterns. Certainty remains low for the broad application in all ARIs.


Research Focusing on Children with Recurrent Respiratory Infections

Research explored the application in pediatric populations presenting with frequent or recurrent respiratory tract infections. Studies utilized Randomized and Observational designs monitoring the frequency of subsequent infection episodes. Findings were mixed: some research describes patterns of change in specific subgroups (e.g., those with co-existing viral factors), while other studies in generally healthy children reported no distinct pattern compared to placebo. Evidence quality varies, and results are highly specific to the populations studied.


Long-Term Research and Durability of Study Findings

Studies on Inosine Pranobex have primarily focused on short-term or episodic symptom patterns. Data characterizing the sustained effects on viral recurrence and the overall durability of any observed patterns are still emerging. Most follow-up durations were limited to the acute phase or short period thereafter, meaning evidence is limited for maintaining stability against chronic or long-term conditions.


What Remains Unclear and Key Research Gaps

While research contributes to the evidence landscape, evidence quality varies across studies, limiting overall certainty. Findings regarding outcomes for the overall population in acute conditions were mixed. Data for certain groups remain insufficient, particularly for immunocompromised or severely ill patients. The duration of use necessary to sustain any observed pattern of change is not uniformly defined in the research.

Key Studies & References

  1. Inosine Pranobex in the Treatment of Cervical HPV Infections

Frequently Asked Questions (FAQ)

Common questions about Imunovir (FAQ)


Q: What is Imunovir and what is it used for?

Imunovir is an antiviral medicine that also has an effect on the immune system, often referred to as an immunomodulatory effect. According to official product information, it is used to treat specific conditions, including certain infections caused by herpesviruses, and to manage a condition known as subacute sclerosing panencephalitis (SSPE).


Q: How long does the treatment with Imunovir usually last?

The duration of treatment with Imunovir is determined by the specific condition being treated, how severe it is, and how the patient responds. For short-term illnesses, treatment may last for a few days up to two weeks. However, for chronic or more severe conditions, official regulatory documents state that treatment may be repeated or continued for several months.


Q: What is the active substance in Imunovir?

The active substance, or the ingredient that makes the medicine work, is Inosine Pranobex, also known by its chemical name Inosiplex. The official product information specifies this compound as the medicinal component.


Q: Can Imunovir affect blood tests or organ functions?

Studies and official information indicate that Imunovir can potentially cause a temporary increase in the levels of uric acid in the blood. The substance uric acid is a natural compound found in the body. Regulatory documents also state that temporary changes in liver and kidney function tests may occur, but these generally return to normal after treatment is stopped.


Q: Does Imunovir interact with any foods, specific drinks, or supplements?

According to the official product information, there is no specific mention of interactions between Imunovir and common foods, drinks, or supplements that would significantly affect its use. Patients are generally advised to inform their healthcare provider of any other medications or supplements they are using.


Q: What should I do if I forget to take a dose of Imunovir?

Regulatory documents provide specific guidance for a missed dose, generally indicating that it should be taken when remembered, unless it is close to the next scheduled dose. Official prescribing information details the procedure for when to skip a missed dose if the next dose time is near. Specific instructions for dosing must always be followed as directed by a healthcare professional.

How should Imunovir be stored and disposed of?

Storage Conditions

Imunovir tablets do not require any special storage conditions according to official regulatory documentation. This indicates the medication is stable when stored under normal ambient conditions, allowing for typical room temperature storage. The product has a labeled shelf-life of five years.

To ensure quality and proper identification, the medicine must be kept in its original carton and blister packaging and must not be used after the expiry date shown on the pack.

Disposal and Safety

As a mandatory safety precaution, Imunovir must be stored out of the sight and reach of children.

Regarding disposal, regulatory instructions state that medicines must not be thrown away via wastewater or household waste. Expired or unused product must be disposed of by following local guidance, typically requiring the patient to ask a pharmacist for proper collection and disposal.

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

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