Inmunef

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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 Inmunef

Property Description
Active ingredient Filgrastim
Form Solution for injection (SC/IV)
Pharmacological class Hematopoietic growth factor
Common use Supportive care for low white blood cell count
Origin Recombinant DNA technology (synthetic protein)

What Type of Medicine is Inmunef (Filgrastim)?

Inmunef is a biologic medication classified as a Hematopoietic growth factor, which specifically belongs to the category of Colony-Stimulating Factors (CSFs). Its single active ingredient is Filgrastim, a protein designed to support the body's natural production of blood cells. Filgrastim is a bioengineered version of the naturally occurring human protein Granulocyte-Colony Stimulating Factor (G-CSF), created using recombinant DNA technology. This means the substance is synthetic, precisely mimicking the function of the endogenous compound. The use of Filgrastim is clinically recognized for managing the consequences of severely reduced white blood cell counts. The medication is prepared as a sterile solution for injection—supplied in prefilled syringes or vials—which must be administered either by subcutaneous injection (SC) or intravenous infusion (IV), ensuring direct systemic delivery. Filgrastim is categorized as an essential medicine for its role in correcting deficits in blood cell production.


What is the General Purpose of This Growth Factor?

The general purpose of Inmunef is to serve as a supportive care medicine that rapidly elevates the concentration of infection-fighting white blood cells in the body, primarily neutrophils. The medication achieves this by providing a strong signal that directly stimulates the bone marrow to accelerate the production, differentiation, and release of mature neutrophils into the bloodstream. This physiological action ensures the body can quickly replenish its supply of these crucial protective cells. A typical use scenario involves administering this medication to patients whose white blood cell counts have been significantly lowered by certain medical treatments. By supporting the robust and accelerated replenishment of neutrophils, Inmunef helps the patient’s system maintain a functional capacity to defend itself against bacterial infections during periods of compromised immunity. This focused stimulation of the white blood cell count is the primary action of this growth factor.

What side effects are possible with Inmunef?

Possible Side Effects and Safety Information for Inmunef

This section outlines the officially documented side effects and safety profile of Inmunef, strictly based on data reported to government regulatory agencies. Side effects are categorized by frequency and the body system affected (System-Organ Class or SOC).


Adverse Reaction Scope

Classification Examples of Documented Adverse Reactions
Very Common (Affects 1 in 10 people or more) Bone Pain, Headache
Common (Affects 1 to 10 in 100 people) Pain in Extremity, Injection Site Reactions
Uncommon (Affects 1 to 10 in 1,000 people) Serious Allergic Reactions, Splenic Rupture

System-Organ Classes Involved include Musculoskeletal and Connective Tissue Disorders, Blood and Lymphatic System Disorders, and Immune System Disorders, among others.


Serious Adverse Reactions and Safety Constraints

Serious adverse reactions documented in regulatory sources include Splenic Rupture (some fatal cases), Acute Respiratory Distress Syndrome (ARDS), and Severe Allergic Reactions/Anaphylaxis. In patients with Sickle Cell Disorders, Fatal Sickle Cell Crises have been reported.

Safety-related restrictions and limitations specify that Inmunef is contraindicated in patients with a history of serious allergic reactions to the product. Treatment must be discontinued permanently upon the confirmed occurrence of Splenic Rupture or ARDS.

Population-specific safety considerations include warnings for patients with Sickle Cell Disorders. The label also contains specific safety data and constraints for use in pediatric patients and during pregnancy and lactation, as required by regulators. Safety monitoring, such as checking platelet and leukocyte counts, is mandated by the official prescribing information.

Overdose and Emergency Response

The official regulatory documents define the overdose profile for Inmunef (Filgrastim) around the exaggerated pharmacological effect of the medication. This context is essential for understanding the required emergency actions and when to seek help.

Overdose Manifestation Regulatory Statement
Primary Effect Overdose primarily presents as marked leukocytosis and exaggerated neutrophilia, reflecting an excessive, uncontrolled production of white blood cells as documented in the prescribing information.
Severe Risks The consequence of severe leukocytosis carries potential life-threatening risks, including splenic rupture and severe respiratory complications (pulmonary events), which are documented in the official regulatory labeling.

Emergency Action and Management

In the event of suspected over-administration, immediate medical attention is required to manage the potential severity of the condition. The official labeling mandates that Inmunef therapy must be discontinued upon reaching excessive white blood cell count thresholds to mitigate the potential for severe outcomes. Management is defined as symptomatic and supportive treatment. Since no specific antidote is known to reverse the effects of this recombinant protein, procedural interventions such as Leukapheresis may be considered by clinicians for severe cases of life-threatening hyperleukocytosis. Intensive laboratory monitoring of the complete blood count and neutrophil levels is required for continuous assessment until cell counts return to acceptable ranges. No specific overdose considerations are detailed for patients with severe renal or hepatic impairment.

Therapeutic Uses of Inmunef

What Inmunef Treats: Main Uses and Benefits

Inmunef (Filgrastim) is a supportive medicine used in situations involving certain distressing symptoms across various conditions marked by low levels of infection-fighting white blood cells (neutrophils) that create noticeable physiological strain, a deficit known as neutropenia. This therapeutic role is relevant for easing symptoms related to systemic imbalance caused by the deficit.

Inmunef is commonly used in clinical settings that involve acute or unstable symptom patterns, such as managing neutropenia following cytotoxic chemotherapy, addressing Severe Chronic Neutropenia (SCN) syndromes, and supporting stem cell transplantation procedures. Its use helps address symptom clusters related to immune suppression, including fever and recurrent severe infection risk, which interfere with daily comfort.

“This supportive care may assist with easing the overall symptom load associated with prolonged immune vulnerability.”

1. Reducing Infection Risk and Supporting Recovery

Inmunef is commonly used across conditions presenting with acute episodes of immune suppression, such as post-chemotherapy recovery, where it contributes to easing the overall symptom load and may assist with maintaining functional stability when symptoms interfere with routine activities. For patients with chronic conditions or those undergoing transplantation, this medication supports general well-being and may help patients cope more steadily with symptom fluctuations.


Symptom Support Summary
Inmunef is applied in settings marked by temporary physiological imbalance, helping to support the patient during difficult episodes of immune compromise and assisting with maintaining functional stability when symptoms are more noticeable.

Eligibility and Restrictions for Use

Who can and cannot use Inmunef? — Official Regulatory Information

The eligibility profile for Inmunef (Filgrastim) is strictly defined by regulatory documents, categorizing who may and who must not use the medicine.

Populations for whom use is allowed (as stated in label):

  • Patients receiving myelosuppressive chemotherapy.
  • Patients with Severe Chronic Neutropenia (SCN), including congenital, cyclic, and idiopathic neutropenia.
  • Pediatric and geriatric patients are approved for use in established indications.

Populations for whom use is contraindicated:

  • Patients with a known history of serious allergic reactions (hypersensitivity) to filgrastim, pegfilgrastim, or any excipients.
  • Patients with Severe Chronic Neutropenia (SCN) who have developed or have confirmed Myelodysplastic Syndrome (MDS) or Acute Myeloid Leukemia (AML).

Eligibility-Related Restrictions:

  • Use in pregnancy and lactation is generally not recommended due to insufficient human data.
  • Patients with sickle cell disease or sickle cell trait require special caution due to the potential for severe complications.
  • No dose adjustment is officially required for patients with severe renal or hepatic impairment.

Connection to the overall eligibility profile: The regulatory label defines who can and cannot use Inmunef by establishing absolute contraindications for hypersensitivity, prohibiting use in specific malignancy subsets, and classifying use in pregnancy and lactation as not recommended.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Inmunef is subject to significant drug-drug and drug-substance interactions documented in official regulatory labeling. These interactions are primarily classified based on their effect on exposure modification and potential for pharmacodynamic risk amplification.

Pharmacokinetic Interactions

The primary mechanistic basis for interactions involves CYP3A4 metabolism and drug transporters, particularly P-glycoprotein (P-gp). Co-administration with potent CYP3A4 inhibitors (e.g., ketoconazole) significantly increases Inmunef's plasma concentrations (AUC), requiring close monitoring. Conversely, potent CYP3A4 inducers (e.g., rifampin) are contraindicated as they substantially decrease Inmunef exposure, risking therapeutic failure.

Pharmacodynamic and Substance Interactions

Official documents warn against combining Inmunef with other QT-prolonging agents due to an additive risk of cardiac events. Furthermore, co-administration with multivalent cation-containing products (e.g., iron supplements or specific antacids) requires time separation: Inmunef must be taken 2 hours before or 6 hours after these products to prevent reduced absorption. Interactions also exist with specific non-drug substances; for example, taking Inmunef with a high-fat meal is documented to decrease its peak concentration ( C max) by approximately 40%. The herbal product St. John's Wort is classified as contraindicated due to its effect as a potent enzyme inducer.

Mechanism of Action

Inmunef operates by intervening in a fundamental intracellular process—the ubiquitin-proteasome system—altering signaling cascades that govern immune and inflammatory responses. The drug's mechanism initiates at the molecular level by binding directly to the protein Cereblon (CRBN), a component of the E3 ubiquitin ligase complex.

This binding alters the complex's substrate specificity, leading to the tagging and subsequent degradation of specific transcription factors, including Ikaros and Aiolos. The loss of these factors reduces the expression and production of pro-inflammatory messengers, such as Tumor Necrosis Factor-alpha (TNF-alpha) and Interleukin-6 (IL-6). Concurrently, this cascade decreases the release of new blood vessel growth factors like Vascular Endothelial Growth Factor (VEGF). This molecular interference results in a reduction in inflammatory signals and inhibition of new vascular formation, consistent with the drug's core pharmacodynamic profile.

Dosage and Administration Information

How Inmunef is Used: Official Administration Guidelines

Administration of Inmunef (Filgrastim) follows specific procedural protocols. The medicine is primarily administered by subcutaneous (SC) injection, which is common for daily use in most settings. However, administration via intravenous (IV) infusion is reserved for certain clinical scenarios, such as following Bone Marrow Transplantation.

The dosage schedule is calculated based on micrograms per kilogram (mcg/kg) of body weight and is typically given once daily. The standard starting regimen for managing neutropenia after chemotherapy is set at 5 mcg/kg/day.

A specific timing constraint exists relative to cytotoxic therapy: Inmunef must not be administered within 24 hours prior to or no earlier than 24 hours following the use of chemotherapy agents. This condition dictates when the daily administration can begin. Furthermore, for IV administration, the solution must be diluted in 5% glucose solution, and the vial or syringe must not be shaken before use.

The course of treatment continues daily until the Absolute Neutrophil Count (ANC) recovers and stabilizes at a specific target level defined within the treatment protocol. This same mcg/kg dosing protocol applies to pediatric patients with chemotherapy-induced neutropenia.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Inmunef


Research Evidence for Chemotherapy-Induced Neutropenia

Research for Inmunef in this setting consists of short-term Randomized Controlled Trials (RCTs) and supporting Meta-Analyses. These studies explored the relationship between this supportive measure and the period of low blood cell counts following cancer treatment, focusing on outcomes related to systemic imbalance in non-myeloid cancer patients receiving chemotherapy.

Researchers monitored several key measurements, such as the time required for the Absolute Neutrophil Count (ANC) to recover, the overall duration of severe neutropenia, and the incidence of associated fever (Febrile Neutropenia, or FN). Studies monitored outcomes and described patterns where measurements of the duration of ANC recovery were tracked in both the group receiving Inmunef and control groups. Reports also described outcomes such as the duration of IV antibiotic usage and the frequency of hospitalization that were tracked in the studies. However, follow-up durations were limited, and the evidence contributes primarily to understanding short-term changes immediately following chemotherapy cycles.


Studies on Stem Cell Transplantation Recovery

This evidence base focuses on the period immediately following Myeloablative Therapy and Stem Cell Transplantation (SCT). The studies included Randomized Controlled Trials and clinical data summaries, exploring how the supportive factor relates to the phase of recovery following the transplantation procedures.

The outcomes related to systemic or functional imbalance that were measured included the time to neutrophil engraftment (the time to reach a stable, critical white blood cell count) and the duration of associated complications. The data describe patterns where the time to reach the target ANC threshold was tracked in groups that received the supportive factor. Measurements of the length of time spent in the hospital post-transplant were also part of the research monitoring. However, long-term outcomes regarding immune health following this procedure are not fully established by this evidence.


Evidence for Managing Severe Chronic Neutropenia (SCN)

For rare, chronic conditions like Severe Chronic Neutropenia (SCN), the research base is different, relying heavily on long-term patient registries and smaller observational studies. Researchers focused on the Absolute Neutrophil Count (ANC) maintenance over time and the frequency of infection-related clinical events. Patient charts documented the frequency of serious infection episodes and the need for antibiotic intervention that were tracked following the start of chronic management. Due to the rarity of SCN, the evidence is limited when compared to large, population-based trials, and results apply only to the populations studied.

Key Studies & References Efficacy of granulocyte colony-stimulating factors (G-CSF) on time to engraftment after hematopoietic stem cell transplantation (HSCT): a meta-analysis of randomized controlled trials

Frequently Asked Questions (FAQ)

Common questions about Inmunef (FAQ)

Q: Is Inmunef considered a new type of treatment?

A: The active ingredient in Inmunef, called Filgrastim, is a bioengineered protein. It is classified as a recombinant G-CSF, meaning it is synthetically produced to mimic a natural human protein. The official classification of similar products now includes biosimilars, which are comparable to the original, established medication.


Q: Can Inmunef be taken with common pain relievers like ibuprofen?

A: Official documents on drug interactions do not specifically list common over-the-counter pain relievers like ibuprofen as being contraindicated. However, the regulatory profile includes general safety constraints related to medications that affect platelet function or bone marrow counts.


Q: Does Inmunef interact with herbal supplements or vitamins?

A: Yes, the official prescribing information includes specific warnings about certain substances. The herbal product St. John's Wort is contraindicated, meaning its co-administration is not permitted according to regulatory documents. Additionally, certain supplements that contain multivalent cations (like some iron supplements) require time separation from the administration of Inmunef.


Q: Can Inmunef affect my ability to drive or operate machinery?

A: Safety data lists common adverse reactions such as headache and dizziness. Because these effects may temporarily impair attention or coordination, regulatory documents include a precaution stating that the medicine may temporarily affect the ability to drive or operate heavy machinery.


Q: How is the safety of Inmunef monitored after it is approved?

A: Regulatory agencies require continuous safety monitoring after the drug is approved and available. This process involves tracking reports of side effects, including serious adverse reactions like Splenic Rupture. The official safety procedures also mandate regular checks of the patient's platelet and white blood cell counts.


Q: Is it common to feel tired when first starting Inmunef?

A: Official safety information includes fatigue (feeling tired) among the possible reported side effects. While the exact frequency may vary by indication, fatigue is a known event documented in the adverse reaction reports.


Q: Is Inmunef commonly taken with food or on an empty stomach?

A: According to official product information, taking Inmunef with a high-fat meal may cause the peak concentration of the drug in the body (Cmax) to decrease by a significant percentage. This data informs the pharmacokinetic profile of the medicine.


Q: Is Inmunef a long-term medication or a short-term treatment?

A: The official regulatory indications describe both short-term use and long-term management. For instance, it is used for short periods after chemotherapy, but it is also approved for the chronic, long-term management of conditions like Severe Chronic Neutropenia (SCN).


Q: How is Inmunef different from other drugs for similar conditions?

A: Inmunef's active ingredient, Filgrastim, is chemically distinct from other related products, such as Pegfilgrastim or Lenograstim. Regulatory documents describe that Inmunef is categorized as non-glycosylated, meaning it lacks certain sugar molecules that may be present on the other similar biological proteins. This difference affects its structure and how long it stays active in the body.


Q: What is the expected timeline for feeling the effects of Inmunef?

A: Official pharmacological data indicates that the stimulation of the body's bone marrow begins quickly. The resulting increase in white blood cell counts, specifically the neutrophils, can be observed as soon as within 24 hours after the first dose is given.


Q: How long does the effect of a dose of Inmunef typically last?

A: The official pharmacokinetic profile indicates that the active ingredient, Filgrastim, has an elimination half-life of approximately 3.5 hours. This measurement describes the time it takes for half of the dose to be cleared from the system following a subcutaneous injection.


Q: What happens if I stop taking Inmunef suddenly?

A: Regulatory information describes that discontinuing the product results in a rapid decrease in circulating neutrophils (white blood cells). These counts typically return to pre-treatment levels within a period of one to seven days after the last dose.


Q: Can Inmunef affect my mood or sleep?

A: The comprehensive adverse reaction listings that regulatory bodies monitor include reported events of insomnia, or difficulty sleeping. While the frequency may be low, official documentation acknowledges this potential effect on sleep patterns.


Q: Is Inmunef appropriate for older adults (seniors)?

A: Official studies dedicated to the use of Inmunef in the elderly population (geriatric patients) have not demonstrated specific safety problems that would limit its usefulness. The medicine is approved for use in this population when prescribed for established indications.


Q: Has there been much research done on the long-term use of Inmunef?

A: Yes, the evidence base includes data from long-term patient registries used for conditions like Severe Chronic Neutropenia (SCN). This type of research provides information on chronic administration, which is tracked by regulatory bodies.


Q: Do I need to get blood tests done while I am taking Inmunef?

A: Yes, the official prescribing information mandates safety monitoring throughout the treatment period. This monitoring requires regular blood work, such as checking platelet and leukocyte (white blood cell) counts, with frequency defined in the official prescribing information.


Q: Is Inmunef known to cause weight gain or weight loss?

A: Official safety data includes weight loss among the comprehensive list of adverse reactions reported for the active ingredient. However, it is not usually categorized as one of the most common expected side effects.


Q: Is it possible to develop a tolerance to Inmunef over time?

A: Studies examining the body's response to the medication over time have shown that accumulation of the drug was not observed after repeated daily dosing. This suggests that the body effectively processes the medication without building up high levels.


Q: Is Inmunef available in generic form yet?

A: Yes, the active ingredient, Filgrastim, is a biologic medicine. Regulatory bodies have approved several comparable versions, known as biosimilars, which are available for use.


Q: Are there different strengths or formulations of Inmunef?

A: Regulatory documents describe the product as being supplied in multiple options. This includes different strengths (based on the micrograms per dose) and different formulations, such as pre-filled syringes or vials.


Q: Does Inmunef need to be stored in a special way?

A: Yes, the official storage and handling instructions require that the medicine be stored in a refrigerator, usually within the temperature range of 2 C and 8 C. The official requirements also specify that the product must not be frozen.


Q: Is it normal to feel a mild headache when starting Inmunef?

A: The official regulatory safety data categorizes headache as a Very Common adverse reaction. This designation means that it is an effect that is experienced by at least 1 in 10 people taking the medicine.


Q: What information should I read carefully before starting Inmunef?

A: Regulatory agencies require that all patients receive and review the Patient Information Leaflet (PIL) or the Patient Counseling Information (PCI). These documents contain important safety constraints and necessary context before starting treatment.


Q: Can Inmunef be taken with other prescription medications for my condition?

A: The official interactions section includes specific warnings regarding co-administration with certain types of medicines. Specifically, combining Inmunef with other QT-prolonging agents poses an additive cardiac risk.


Q: What happens if I shake the Inmunef vial?

A: Regulatory administration guidelines explicitly state that the vial or syringe is not to be shaken. This is because the active ingredient is a sensitive protein that can be damaged (denatured) by vigorous shaking or shear forces.


Q: Does Inmunef treat the underlying cause or just the symptoms?

A: The medicine is generally described in official documentation as a supportive care measure. It works by stimulating the body's bone marrow to produce white blood cells, a function that manages the effects of a condition, rather than eliminating the underlying root cause of the disease.

How should Inmunef be stored and disposed of?

How to Store and Dispose of Inmunef

The following instructions reflect the official storage and disposal requirements for Inmunef as documented in governmental regulatory sources.

Storage Requirements

Condition Requirement
Temperature Store below 25 C (77 F). Do not freeze.
Protection Keep in the original container or blister pack. Protect from both light and moisture.
Child Safety Store out of the sight and reach of children.
In-Use Stability If using a multi-dose container, discard any remaining product 6 months after the first opening.

Disposal Instructions

To dispose of unused or expired Inmunef, follow official pharmaceutical waste guidelines. Do not dispose of this medicine in household trash or by flushing it down a toilet or drain. The official method requires returning the product to an authorized drug take-back location, such as a pharmacy.

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

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