Eloprine

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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 Eloprine

Quick Facts

Property Description
Active Ingredient Inosine Pranobex
Form Oral Tablets and Oral Syrup
Pharmacological Class Antiviral Agent and Immunostimulant
General Purpose Supporting the immune system against viral threats
Origin Synthetic Purine Derivative

What Type of Medicine is Eloprine?

Eloprine is a medicinal product whose active ingredient is Inosine Pranobex, classified in the pharmacological category of both an antiviral agent and an immunostimulant. Inosine Pranobex is assigned the code J05AX05, designating it as an “Other Antiviral” for systemic use.

The drug is a synthetic purine derivative, a chemically manufactured substance rather than a natural extract. This complex molecule possesses combined immunomodulatory and antiviral activities. This dual-action nature plays a role in enhancing the body's natural defenses, differentiating it from treatments that rely solely on direct viral inhibition.

Composition, Available Forms, and General Purpose

The medication's effect is rooted entirely in its single active ingredient, Inosine Pranobex. Its primary mechanism is based on enhancing the effectiveness of the cell-mediated immune response. The compound influences the function of key immune cells, specifically the activity of T-lymphocytes and Natural Killer (NK) cells.

Eloprine is available for oral use as standard oral tablets and a liquid syrup. The general purpose is to assist the immune system in mounting a coordinated defense, supporting individuals who experience recurrent infections. The formulation as a syrup is a key feature, making it suitable for diverse patient groups, such as children over one year of age, or others who may have difficulty swallowing solid medication.

Regulatory References

  1. WHO ATC Classification System
  2. Inosine Pranobex - MeSH (NCBI/NIH)

What side effects are possible with Eloprine?

Possible Side Effects and Safety Information

The safety profile of Eloprine (Inosine Pranobex) is defined by officially classified adverse reactions and specific metabolic considerations documented in government regulatory sources, such as the Summary of Product Characteristics (SmPC) and FDA Prescribing Information.

Frequency of Adverse Reactions

The most frequent findings are generally mild and transient, primarily involving changes in laboratory values:

  • Very Common (Affects 1 in 10 or more): Increased blood uric acid levels (hyperuricemia) and increased urine uric acid levels (hyperuricosuria).
  • Common (Affects 1 in 100 to less than 1 in 10): Headache, dizziness, fatigue, malaise, nausea, vomiting, abdominal discomfort/pain, diarrhea, constipation, rash, pruritus, and joint pain (arthralgia). Liver enzyme and blood urea nitrogen levels may also be increased.
  • Uncommon (Affects 1 in 1,000 to less than 1 in 100): Nervousness, insomnia, and increased urine volume (polyuria).

Serious adverse reactions, such as anaphylactic reaction or angioedema, have been reported rarely in post-marketing surveillance.

Population-Specific Safety Constraints

The drug's metabolic action requires specific safety precautions. Eloprine is contraindicated in patients with a known hypersensitivity to the active substance or in those experiencing an acute attack of gout or with significantly elevated baseline uric acid concentrations. Caution is advised for use in individuals with a history of urolithiasis (kidney stones), gout, or pre-existing renal impairment.

Duration-Related Safety

The very common elevations in uric acid levels are typically transient and are expected to return to normal baseline values within a few days after treatment cessation. For treatments extending three months or longer, regulatory guidance specifies that routine monitoring of uric acid levels, liver function, and renal function should be conducted.

Overdose and Emergency Response

Overdose and when to seek help

The official regulatory documentation for Eloprine (Inosine Pranobex) specifies a limited profile for overdose, dictated primarily by a formal lack of clinical experience with acute overingestion in humans.

Overdose Scope

Domain Official Regulatory Statement
Documented overdose presentations No specific clinical experience of acute overdose in humans is formally documented in the regulatory labeling.
Physiological systems affected The metabolic system is anticipated to be affected, leading to a transient elevation of uric acid concentration in the serum and urine.
Emergency-response statements Treatment should be restricted to symptomatic and supportive measures.

Required Emergency Actions

Official labeling indicates that serious adverse effects seem unlikely, based on existing non-clinical data (animal toxicity studies). Consequently, regulators do not explicitly list specific symptoms or conditions as triggers for immediate emergency contact.

There is no specific antidote known or documented in the official prescribing information for Inosine Pranobex overdose. Treatment, as mandated, focuses entirely on applying general symptomatic and supportive measures.

Connection to the Official Overdose Profile

Regulatory documents define the overdose profile by the absence of severe, defined toxicity patterns and the limited expected clinical presentation. The resulting instruction to restrict care to symptomatic and supportive measures serves as the regulator-mandated guidance for any necessary help-seeking action.

Therapeutic Uses of Eloprine

What Eloprine Treats: Main Uses and Benefits

The therapeutic application of Eloprine (Inosine Pranobex) is centered on supportive management of specific viral infections and easing associated symptomatic discomfort. Primary applications include recurrent viral manifestations and support for conditions linked to a sub-optimally functioning immune system.

Conditions and Therapeutic Focus

This medication is relevant for conditions marked by frequent, episodic viral reactivations, such as recurrent herpes labialis (cold sores), genital herpes, and also as supportive therapy for genital warts (HPV). It is commonly used during the acute, symptomatic phase of common viral diseases like influenza-like illnesses and other acute viral respiratory infections. Furthermore, it is relevant for patients with an identified need for immune support, including those with frequent viral infections or the specialized management of Subacute Sclerosing Panencephalitis (SSPE).

The overall benefit is assisting with managing the frequency of recurrent symptoms and providing support that generally supports a more steady management of acute symptoms during episodes.

“This application provides support that may assist in managing the frequency of common viral illnesses in susceptible groups.”


Quick Fact: Relief for Recurrent Symptoms

Category Therapeutic Focus Patient Benefit
Recurrent Infections Episodic manifestations (e.g., herpes outbreaks). Helps ease the burden of chronic symptoms by managing frequency.
Acute Illness Symptoms of influenza-like conditions. Supports a more steady management of acute symptoms during the episode.
Immunological Need Conditions linked to a sub-optimally functioning immune system. Assists with managing the recurrence of viral illness in susceptible patients.

Eligibility and Restrictions for Use

Eligibility Scope

Category Eligibility Rule
Populations Contraindicated Use is strictly prohibited for patients with known hypersensitivity to the drug or who are experiencing an acute attack of gout or severely elevated uric acid levels in the blood. Contraindication also applies to those with existing impaired kidney function or a history of uric acid-related kidney stones (urolithiasis).
Age-Group Eligibility The medicine is permitted for use in adults and in children over one year of age. It is not recommended for use in children in the first year of life (under one year).
Pregnancy and Lactation Status Use is generally not recommended during pregnancy or while breastfeeding, a classification driven by the lack of sufficient controlled human safety data.

Eligibility Classifications

Category Classification Details
Eligibility-Related Restrictions Conditional use requires caution in patients with a history of gout or mild to moderate renal impairment. For long-term treatment, regular monitoring of kidney function and uric acid levels is mandatory.

Resulting Eligibility Structure

Official eligibility statements define the population that can use Eloprine based heavily on its metabolic properties. Absolute contraindications are placed on populations with conditions related to purine catabolism, specifically gout and hyperuricaemia. Use is generally restricted to patients over one year of age. The regulatory status of "not recommended" is assigned to women who are pregnant or breastfeeding, emphasizing the need for a physician’s assessment against the absence of conclusive human data.

What should I know about interactions with other medicines?

Interactions with Other Medicines and Products

The interaction profile of Eloprine (Inosine Pranobex) is officially documented by regulatory authorities, with specific concerns related to its effect on uric acid metabolism and its pharmacokinetic influence on certain other antivirals.

Documented Interaction Categories

Category Interacting Agents and Official Caution
Purine Metabolism Agents that affect uric acid levels, including xanthine oxidase inhibitors (e.g., Allopurinol) and uricosuric agents. Co-administration requires caution due to the risk of additive effects leading to elevated uric acid.
Diuretics Certain diuretics, specifically Thiazides and Loop Diuretics (e.g., Furosemide), must be used with monitoring due to their potential to influence uric acid excretion, compounding the effect of Eloprine.
Antivirals Concomitant use with Zidovudine (AZT) may result in an increase in Zidovudine's plasma concentrations. This is attributed to reduced clearance of Zidovudine, as stated in regulatory prescribing information.

Regulatory Constraints and Considerations

No specific medicinal product combinations are formally classified as contraindicated in official regulatory documentation. However, the potential for elevated uric acid levels means that this interaction is a particular consideration for patients with a history of gout, urolithiasis (kidney stones), or underlying renal dysfunction. The prescribing information does not mandate specific temporal separation (dosing hours apart) for any interacting medicinal products.

Mechanism of Action

Eloprine's Core Action: Signaling Pathway Modulation

Eloprine functions as a multi-target modulator and inhibitor, primarily engaging with critical upstream regulators like Kinases (p38, JNK, Akt) and the NF-κB Transcription Factor. This engagement suppresses the cellular synthesis of inflammatory mediators and reduces cell proliferation signaling.


Inducing Cell Fate Changes and Cellular Arrest

The mechanism extends to directly influencing cell fate by triggering programmed cell death (apoptosis) and inducing cell cycle arrest (G0/G1 or S phase) via modulation of cell cycle regulators. This action modulates the processes of cell survival and proliferation, contributing to the selective removal of cells and adjustment of local cell population dynamics.


Reinforcing Cellular Resilience Against Stress

In addition to modulating pro-survival and pro-inflammatory signaling, Eloprine modulates pathways that regulate cellular defense against damage, such as influencing the Nrf-2 pathway to upregulate antioxidant mechanisms. This action influences the biological processes associated with cellular integrity and management of oxidative species.

Dosage and Administration Information

Eloprine contains inosine pranobex, an antiviral and immunomodulatory agent typically administered orally. Patients should adhere strictly to the dose, schedule, and duration prescribed by a healthcare professional. Do not exceed the maximum daily dosage without medical consultation.

Administration

Eloprine tablets are generally taken with or without food, and the total daily dose is usually divided into multiple, equally spaced doses throughout waking hours. The tablet may be crushed and dissolved in a small amount of liquid to facilitate ingestion, if needed. It is important to complete the full course of treatment as prescribed, even if symptoms begin to improve, to maximize therapeutic efficacy and prevent potential recurrence.

Standard Dosing Guidelines

Dosage is determined by the condition being treated and the patient's body weight, especially in children. For adults, the recommended daily dosage often ranges from 50 mg/kg of body weight, which typically translates to 3 grams per day, divided into 3 to 4 doses. In some cases, the daily dose may be increased up to a maximum of 4 grams.

Patient Group Recommended Daily Dose Administration Schedule
Adults and the Elderly 50 mg/kg/day (usually 3 g/day) Divided into 3 or 4 doses
Maximum Adult Dose 4 g/day Divided into 3 or 4 doses

Important Considerations

Eloprine (inosine pranobex) is a purine derivative and may cause a transient increase in uric acid levels in the serum and urine. Use caution if there is a history of gout, urolithiasis, nephrolithiasis, or impaired renal function. Patients on long-term therapy (3 months or longer) should have their serum and urine uric acid levels, liver function, and renal function monitored regularly by their healthcare provider.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Eloprine

Evidence for Recurrent Viral Manifestations (Herpes and HPV)

Inosine Pranobex was evaluated in research involving conditions characterized by fluctuating or episodic manifestations, specifically recurrent cold sores (herpes labialis) and genital herpes. Studies measured the time to lesion resolution and the frequency of recurrence, comparing these measurements to placebo or other treatments.

For Human Papillomavirus (HPV), the evidence base was evaluated primarily in research where the substance was used as an adjuvant (add-on) to standard care for managing genital warts. Studies monitored outcomes related to the reduction of episodic changes, such as the rate at which warts came back after conventional treatment.

Evidence for Acute Viral Respiratory Illnesses

Inosine Pranobex was studied for conditions associated with acute or disruptive episodes, such as influenza-like illnesses. Randomized Controlled Trials (RCTs) examined the time required for all systemic symptoms, like fever and cough, to return to baseline.

Data show patterns related to symptom resolution time, but results were not consistent across all demographic groups. Subgroup findings indicated that symptom resolution time patterns were observed in certain populations, specifically non-obese participants under the age of 50. Findings were mixed across different age and body weight groups for the total study population.

Specialized Research for Subacute Sclerosing Panencephalitis (SSPE)

Due to the rarity of this chronic neurological condition, the available research includes historical observational studies. Research examined outcomes related to systemic or functional imbalance, such as survival rates and the stabilization of neurological function. Historical observational research and life table analyses reported measurements of cumulative survival rates that were associated with the substance in certain cohorts when compared to untreated historical groups. The specific contribution of the substance alone is not fully established, as observed patterns often rely on data derived from combination regimens.

Research Gaps and Uncertainties

Evidence quality varies across studies, and findings were mixed or inconsistent in certain subgroups. Limited comparative evidence exists for several indications when assessing the substance as a standalone monotherapy versus an adjuvant. Furthermore, long-term effects are not fully established, and follow-up durations were limited across many key trials, providing limited insight into the long-term patterns of symptom frequency.

Key Studies & References

  1. Efficacy and safety of inosine pranobex in patients with herpes simplex labialis: a systematic review and meta-analysis

Frequently Asked Questions (FAQ)

Common questions about Eloprine (FAQ)

Q: What is the main reason doctors prescribe Eloprine?

Official product information indicates that the medicine is approved for the treatment of specific viral infections, including those caused by the Herpes Simplex Virus. It is also documented for use in rare conditions such as subacute sclerosing panencephalitis (SSPE).


Q: Is Eloprine the same kind of medicine as other common treatments for this condition?

Regulatory classification documents define this medicine as both an antiviral agent and an immunostimulant (ATC code J05AX05). This designation reflects its dual-action mechanism, which involves directly supporting the immune system's cell-mediated response against viral threats. This profile is what differentiates it from treatments that rely solely on direct viral inhibition.


Q: What happens if I miss a time I was supposed to take Eloprine?

Official patient information describes the procedure for a missed dose. It typically instructs patients to take the dose as soon as it is remembered, unless it is near the time of the next scheduled dose. In that case, the instruction is to skip the missed dose and return to the regular schedule. Official guidance strictly warns against taking two doses simultaneously.


Q: Are there any long-term safety concerns associated with using Eloprine?

Regulatory guidance for treatments extending beyond three months mandates the monitoring of kidney function, liver function, and uric acid levels. This precaution is related to the drug’s potential to cause transient increases in uric acid. Official safety information also mentions the possibility of developing ureteric and biliary calculi (stones) during long-term use.


Q: Can Eloprine be used by people with kidney issues?

Official eligibility documents state that the medicine is strictly contraindicated, or prohibited, in patients who have pre-existing severe renal impairment. For individuals with a history of kidney stones (urolithiasis) or existing mild to moderate kidney dysfunction, official information states that caution is advised.


Q: Is Eloprine safe for older adults to use?

The medication is permitted for use in the elderly population. However, regulatory warnings note that the transient increase in uric acid levels is commonly observed in this ageing population. Official documentation specifies that these individuals, particularly those with related underlying conditions, are included in the precautions section.


Q: What is the risk of having a serious reaction to Eloprine?

According to official safety documentation from post-marketing surveillance, serious adverse reactions are reported rarely. These rare events include severe allergic responses such as anaphylactic reaction or angioedema, which involves swelling beneath the skin.


Q: Is there a generic version of Eloprine available?

The active component of the medicine is called Inosine Pranobex. This is the non-proprietary chemical name used in regulatory and authoritative documents. This non-proprietary name is the basis for various generic products manufactured and approved globally.


Q: Does Eloprine cause any issues with memory or focus?

Regulatory documentation lists side effects such as dizziness (common) and nervousness (uncommon). While the official safety profile does not specifically name memory or focus issues, these reported central nervous system effects may be a factor in concentration.


Q: Is it safe to drive or operate machinery while taking Eloprine?

Official patient safety warnings include a caution regarding driving or operating heavy machinery. This caution is issued because of common side effects such as dizziness and fatigue/drowsiness that may occur in some individuals. Official documentation warns that if these effects are experienced, activities requiring concentration may be affected.


Q: What is the official recommended purpose of Eloprine according to the regulatory agencies?

Official product information indicates that the medicine is approved for the treatment of specific viral infections, including those caused by the Herpes Simplex Virus. It is also documented for use in rare conditions such as subacute sclerosing panencephalitis (SSPE).


Q: What kind of research has been done on Eloprine in pediatric populations?

The medicine is permitted for use in children over one year of age. Safety documentation for the paediatric population includes specific findings. The most consistently reported finding in official documents for this age group is the transient elevation of uric acid levels.


Q: Is Eloprine considered a controlled substance?

According to official legal status classifications, the medicine is designated as a prescription-only drug. It is important to note that authoritative bodies do not list it as a federally controlled substance.


Q: How long does it typically take for the side effects of Eloprine to go away?

Most officially documented side effects are described as generally mild and transient, meaning they are temporary. Specifically, the most common finding, which is the transient increase in uric acid levels, is expected to return to normal baseline values within a few days after treatment cessation.


Q: Is Eloprine a short-term or long-term medication?

Regulatory information indicates the medication is used in both contexts. It is prescribed for defined courses of treatment for acute conditions, with guidance to complete the full course. However, official guidelines also describe its use in long-term therapy (three months or longer) for certain chronic conditions, a use which requires ongoing medical monitoring.


Q: Are there any known drug interactions that require a dosage adjustment for Eloprine?

The regulatory interaction profile notes a specific finding regarding concomitant use with Zidovudine (AZT). The official information states that this combination may lead to an increase in Zidovudine's plasma concentration due to reduced clearance of that medicine.


Q: What population groups were included in the primary studies for Eloprine?

Research evidence is summarized from studies that included populations with recurrent viral manifestations, such as herpes and Human Papillomavirus (HPV). Other studies examined individuals with acute viral respiratory illnesses and specific cohorts affected by the chronic neurological condition, SSPE.

How should Eloprine be stored and disposed of?

How to Store and Dispose of Eloprine (Inosine Pranobex)

Official Storage Requirements

Eloprine (Inosine Pranobex) tablets do not require any special storage conditions and remain stable at typical room temperatures. The product's labeled stability, which grants it a 5-year shelf-life, is maintained only when the tablets are stored in their original blister packaging until use.

Mandatory Safety and Disposal

It is mandatory to keep this medicine out of the sight and reach of children to prevent accidental ingestion. When the medicine is no longer needed, there are no special requirements for its disposal, but regulatory guidelines advise against throwing it away via wastewater or standard household trash. Patients should consult a pharmacist or local authority for guidance on proper pharmaceutical waste disposal, which must conform to local regulation.

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

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