Pimafucin

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Pimafucin

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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 Pimafucin

Property Description
Active Ingredient Natamycin (Pimaricin)
Form Cream, suspension, vaginal pessaries (suppositories)
Pharmacological Class Antifungal drug, Polyene macrolide antibiotic
Primary Action Type Fungicidal (actively kills fungi)
Origin Natural-origin compound (bacterial fermentation)

Defining Pimafucin: Class, Composition, and Origin

The medicinal preparation Pimafucin is classified as an antifungal drug defined by its sole active ingredient, Natamycin. This compound is chemically categorized as a polyene macrolide antibiotic, a substance produced via the fermentation of specific bacteria, demonstrating a natural origin. Natamycin functions as an agent against fungal pathogens, differentiating it from conventional systemic antibiotics primarily targeting bacteria. It is used in controlling susceptible fungal species, which characterizes its established role in therapeutics.

The Unique Delivery and General Purpose

Pimafucin is designed exclusively for localized application and is available in forms such as creams, suspensions, and vaginal pessaries, ensuring the topical or intravaginal route of administration. This localized approach concentrates the active ingredient, Natamycin, precisely where the infection is present. Natamycin achieves its purpose through fungicidal action, selectively binding to ergosterol, a molecule essential to the fungal cell membrane. This focused action is utilized in managing local fungal overgrowth and is commonly applied where the infection is confined to a specific tissue or mucosal surface. The product is positioned as a medication for health issues related to fungal organisms, reflecting its diverse forms tailored for mucosal application.

Regulatory References

  1. MedlinePlus

What side effects are possible with Pimafucin?

Possible side effects and safety information

The official safety profile for localized Natamycin (Pimafucin) formulations is predominantly characterized by events occurring at the site of application, reflecting the minimal systemic absorption of the active ingredient, as documented by regulatory authorities.


Adverse Reaction Scope

Adverse effects are categorized within System-Organ Classes such as Skin and subcutaneous tissue disorders, General disorders and administration site conditions, and Immune system disorders.

Classification Adverse Reactions
Common Local irritation; Sensation of burning
Frequency Not Known Hypersensitivity reactions (including contact dermatitis)

The most frequent adverse events are the local irritation and burning sensation, which regulatory documents classify as Common. These local reactions may be more noticeable at the beginning of treatment.

High-Level Safety Constraints

The most significant safety event acknowledged in official labeling is the potential for hypersensitivity reactions, which represents the primary absolute safety constraint. The product is formally contraindicated in individuals with a known hypersensitivity to Natamycin or any of the product's excipients.

Due to the localized use, regulatory documents typically do not specify unique safety considerations or dose adjustments regarding adverse reaction frequency for special populations such as older adults or those with renal or hepatic impairment.

Overdose and Emergency Response

Overdose and when to seek help


Official Regulatory Information

The regulatory profile for Natamycin (the active ingredient in Pimafucin) is significantly influenced by its negligible systemic absorption when applied topically or intravaginally. Consequently, acute systemic toxicity from the intended use is not documented in official prescribing information.


Documented Overdose Manifestations and Actions

While systemic toxicity is rare from topical application, regulatory documents address scenarios of accidental oral ingestion. High-quantity oral doses have been associated with gastrointestinal effects such as nausea, vomiting, and diarrhoea.

Overdose management is restricted to symptomatic and supportive treatment, as no specific antidote is known for Natamycin.


When to Seek Urgent Medical Help

Official government guidance mandates that an individual seek immediate medical attention and contact emergency services (e.g., Poison Control Center) if accidental overdose or ingestion of Pimafucin is suspected. This action is required even if there are no immediate signs of discomfort or poisoning, and may necessitate hospital monitoring to manage potential gastrointestinal effects.

Therapeutic Uses of Pimafucin

What the Medicine Treats: Main Uses and Benefits

The medicine is relevant when supportive symptom management is appropriate in contexts involving heightened systemic burden. It is commonly used to help with symptoms associated with acute or disruptive episodes, and it may be part of symptomatic management in situations where patients experience localized discomfort.

The medicine is applied in conditions where organisms susceptible to natamycin are present. It is used in addressing symptoms related to inflammatory or irritative states and provides assistance in stabilizing acute or recurrent episodes. It is relevant for easing symptoms that may appear in conditions involving episodic or fluctuating manifestations, or those presenting with systemic or localized discomfort.


Supporting Comfort During Periods of Heightened Symptoms

This medication is used in situations involving certain distressing symptoms and is applicable within clinical settings that involve acute or disruptive symptom patterns. It plays a role in managing symptoms that create noticeable physiological strain, providing support that helps ease the overall symptom burden and contributes to improved day-to-day comfort during symptomatic periods. It may assist with maintaining functional stability when symptoms are more noticeable.


Quick Facts

  • Relief Axis: Helps address symptom clusters that may become intense or disruptive.
  • Use Context: Applied across domains where additional symptomatic support is needed.
  • Benefit: Contributes to improved comfort during periods of heightened symptoms.

Eligibility and Restrictions for Use

The eligibility profile for Pimafucin (Natamycin in its localized forms, such as cream or vaginal pessaries) is defined by a narrow set of regulatory exclusions and conditional use categories.


Populations and Eligibility Status

Population Group Regulatory Status Status Notes (Official Labeling)
Hypersensitivity Contraindicated Must not be used by individuals with a history of allergy to Natamycin or any excipients [Source 1.6].
Adult Patients Permitted Standard population for use [Source 3.2].
Pediatric Patients Use Not Established Safety and effectiveness have not been established [Source 1.6].
Pregnant Women Conditional Use Should be given only if clearly needed; FDA classifies it as Pregnancy Category C [Source 1.6].
Nursing Mothers Conditional Use Caution should be exercised, as it is not known whether the drug is excreted in human milk [Source 1.6].

Condition-Based Restrictions

Due to the localized nature of the application and minimal systemic absorption, official regulatory documents typically state no specific restrictions or dosage adjustments are required for patients with pre-existing hepatic (liver) or renal (kidney) impairment [Source 1.3]. The primary regulatory constraint remains the absolute prohibition of use due to hypersensitivity.

What should I know about interactions with other medicines?

The interaction profile for Pimafucin (Natamycin), which is administered topically or locally, is defined by its negligible systemic absorption, as noted in regulatory documentation. This low absorption dictates that documented interaction concerns are strictly confined to local administration patterns and pharmacodynamic risks at the site of application.

Interaction Scope

Property Documentation Status
Medicinal product categories with documented interactions: Topical Corticosteroids; Other Topical/Ophthalmic Medications.
Mechanistic basis of interactions (only if stated in label): Local Pharmacodynamic effect (risk of worsening infection); Local Administration Constraint (dilution risk).
Timing-based interaction rules (if applicable): A mandatory separation interval (typically 10 to 15 minutes) is required between Natamycin ophthalmic suspension and other topical eye preparations.
Interaction-related restrictions: Formal restriction or caution exists regarding concurrent use with topical corticosteroids due to the local risk of accelerating the fungal infection.
Food, alcohol, herbal product interactions: None documented in official regulatory labeling.

Interaction Classifications (High-Level)

Classification Documentation Status
Interaction severity classification: Local Restriction; Administration Constraint.
Systemic PK Interactions: None documented.

Resulting Interaction Structure

Official interaction statements:

  • Official regulatory documents do not identify clinically relevant pharmacokinetic interactions (CYP-mediated or transporter-based) with systemically absorbed medicinal products.
  • The co-administration of topical corticosteroids is subject to formal restrictions due to the potential for a negative local pharmacodynamic outcome.
  • A procedural timing rule is required to space the administration of Natamycin and other topical ophthalmic preparations to maintain drug concentration.

The regulatory interaction profile is primarily structured by the product's local site of action. This framework establishes that the interaction concerns are confined to local substance restrictions and mandatory procedural constraints for co-administration, eliminating the need for extensive warnings regarding systemic drug-drug interactions.

Mechanism of Action

Molecular Targeting of Fungal Ergosterol

The foundation of Natamycin's action is its specific high-affinity binding to ergosterol, the key sterol component within the fungal plasma membrane. This molecular interaction fundamentally disrupts the structural integrity and functionality of the membrane. The resulting physiological consequence is a selective effect that concentrates the membrane disruption solely on the fungal cell, due to the absence of ergosterol in human cell membranes (which contain cholesterol).

Functional Inhibition and Fungicidal Cascade

Following the initial binding, the drug initiates a rapid mechanistic cascade leading to the disruption of essential life processes. This includes the direct inhibition of nutrient transport pathways across the compromised membrane and the disruption of vital internal regulatory functions, such as vacuole fusion. The cumulative physiological consequence is a fungicidal action, resulting from the collapse of the fungal organism's metabolism and structure.

Dosage and Administration Information

Natamycin (Pimafucin) is used via localized administration routes: topical ophthalmic, intravaginal, and topical cutaneous (skin). The 5% ophthalmic suspension is for topical ophthalmic use only and must not be injected.

Administration and dosing are standardized based on the dosage form:

Form & Strength Standard Adult Dose Frequency Pattern
Vaginal Tablet (100 mg) One tablet Once daily
Ophthalmic Suspension (5%) One drop Hourly/Two-hourly (initial); 6–8 times daily (maintenance)

The total course duration varies by administration route. The intravaginal regimen is a short course, generally continuing for 3 to 6 days. The ophthalmic treatment is longer, typically spanning 14 to 21 days or until resolution. For the ophthalmic suspension, the initial high-frequency schedule is typically maintained for the first three to four days before the dose is gradually reduced to the maintenance frequency.

Key procedural instructions are part of its use. The ophthalmic suspension must be shaken well before using to ensure uniform drug distribution. The intravaginal tablet is administered at bedtime while the user is in a lying position. Furthermore, the safety and effectiveness have not been established in pediatric patients for ophthalmic use, which defines an age-group administration rule.

Recent Clinical Evidence

Evidence for Use in Vaginal Fungal Infections (Vulvovaginal Candidiasis)

The research base for Natamycin in vaginal fungal infections (VVC) includes Randomized Controlled Trials (RCTs) and systematic reviews that explore how symptoms change in research settings for patients with acute and recurrent infections. Research focused on both clinical symptoms (outcomes related to physical discomfort like itching and discharge) and the laboratory status of the fungal organism (mycological status). Studies reported patterns observed in these measurements, often compared to other antifungal agents. The evidence supporting short-term outcomes is derived from frequent RCT designs. However, long-term effects are not well characterized, and recurrence rates remain a focus of ongoing investigation.

Evidence for Use in Fungal Infections of the Eye

Research related to Natamycin in eye infections, such as Fungal Keratitis, is based on a limited number of Controlled Trials. These studies monitored outcomes such as the change in patient visual acuity and the time required for the clinical signs of the infection to resolve. The overall body of evidence for this application is derived from a limited set of randomized trials, and results apply only to the specific, small populations studied.


Long-Term Studies and Durability of Outcomes

The research exploring short-term symptom changes typically involves follow-up durations that are specified within the treatment period or soon after (e.g., a few weeks for VVC or three months for eye infection studies). Evidence contributes to understanding symptom patterns during acute episodes, but long-term effects are not fully established, and available data does not provide a comprehensive picture of durability.

Evidence in Special Populations

Specific research was observed in certain populations, particularly with respect to pregnant women with VVC populations. However, data remains insufficient for certain groups. For instance, the study population for the ophthalmic suspension was limited to adult patients; consequently, data remains insufficient for the pediatric population.


The Landscape of Evidence Gaps and Uncertainties

A key limitation across both primary areas of use is that comparative evidence is lacking when assessing the medicine against certain newer therapeutic options. Furthermore, there is limited information for long-term outcomes as follow-up durations were often limited in the existing body of research.

Key Studies & References

  1. Randomized trial of natamycin versus voriconazole for fungal keratitis (MUT/NAT trial structure)
  2. WHO Model List of Essential Medicines (Relevant entry for Natamycin)

Frequently Asked Questions (FAQ)

Common questions about Pimafucin (FAQ)


Q: What is the main difference between Pimafucin cream and Pimafucin suppositories?

The key difference lies in the intended route of administration and the site of the infection being treated. Regulatory documents state that the cream is officially indicated for infections of the skin and mucous membranes. In contrast, suppositories (vaginal tablets) are specifically indicated for the treatment of vaginal fungal infections, such as vaginal candidiasis.


Q: Is Pimafucin used for skin infections outside of the main uses listed?

Yes, regulatory approvals indicate that Pimafucin cream is used for the treatment of skin and mucous membrane infections caused by susceptible yeasts. This includes those caused by organisms such as Candida albicans.


Q: Can Pimafucin treat yeast infections in men?

Official regulatory documents indicate that the cream formulation is used for skin and mucous membrane infections. If a yeast infection is located on these areas and is caused by a susceptible organism, the product's local indication is described as not being exclusive to women.


Q: How quickly does Pimafucin typically start to work, according to official sources?

Official labeling does not provide a specific time for the onset of action or symptom relief. However, official advice for eye infections suggests that lack of improvement after 7 to 10 days may indicate the need for a re-assessment to determine if the infection is susceptible to the drug.


Q: Can Pimafucin be used by children of a certain age, based on regulatory approvals?

Official product information for the ophthalmic suspension states that safety and effectiveness have not been established in pediatric patients. For other topical forms, determinations regarding use should be made with a healthcare professional, as studies in specific pediatric populations may be limited or lacking.


Q: Is it safe to use Pimafucin if I am pregnant, according to official guidelines?

According to the official product information, Natamycin is classified as Pregnancy Category C in the US. This means that it is not known whether the medicine can cause harm to an unborn baby. Official guidance states that it should only be used if the need is clearly established.


Q: What is the risk category for Pimafucin during breastfeeding, as described in official documents?

Official documents state that it is not known whether the medicine is excreted into human milk. Therefore, official guidance advises that caution should be exercised when the medicine is administered to a patient who is breastfeeding.


Q: Are there known interactions between Pimafucin and common pain relievers like ibuprofen?

Regulatory documents indicate that it is not likely that orally or systemically absorbed medications, such as ibuprofen, will interact with topical Pimafucin. This is because the drug has very poor systemic absorption into the bloodstream following localized application.


Q: Can Pimafucin interact with birth control pills?

Official regulatory documents state that systemic absorption is not expected following topical application of Pimafucin. Therefore, clinically relevant pharmacokinetic interactions with systemic products like oral birth control pills are not identified in the labeling.


Q: Is it true that Pimafucin can be used to treat eye infections?

Yes. Natamycin ophthalmic suspension is officially indicated for the treatment of various fungal eye infections, including fungal blepharitis, conjunctivitis, and keratitis, when caused by susceptible fungal organisms.


Q: How does Pimafucin compare to other antifungal medicines in terms of general classification?

Pimafucin's active ingredient, Natamycin, is classified as a polyene macrolide antibiotic and an antifungal agent. This classification places it in a different chemical category from other antifungal classes, such as azoles or synthetic agents.


Q: Are there any dietary restrictions mentioned in the official information when using Pimafucin?

Official regulatory labeling for Pimafucin does not document any specific interactions or restrictions related to food, alcohol consumption, or tobacco use.


Q: Does research evidence support the use of Pimafucin for infections that often recur?

Research has been conducted on its use in recurrent infections, such as vulvovaginal candidiasis (VVC). However, official research summaries note that long-term effects are not fully established, and recurrence rates remain a focus of ongoing investigation in the available studies.


Q: Is there a maximum time that Pimafucin is described as being used in official guidelines?

The maximum duration of use varies significantly by the type of product and the site of infection. For the ophthalmic suspension, therapy is generally continued for 14 to 21 days. The vaginal treatment, however, is typically described as a short course lasting 3 to 6 days.


Q: Are there different strengths of Pimafucin available, and what are they used for?

Yes, different forms have different strengths. Official regulatory forms include a 100 mg vaginal tablet and a 5% ophthalmic suspension. Other formulations, like the cream, are available as part of the overall product family.


Q: Do studies exist that examine the use of Pimafucin in the elderly population?

Official information for the ophthalmic suspension notes that no overall differences in safety or effectiveness have been observed between elderly patients and younger patients in the studies conducted.


Q: Is Pimafucin known to cause allergic reactions, and what are the signs?

Yes, allergic reactions (hypersensitivity) are among the adverse events mentioned in the official labeling. Non-specific signs of a potential allergic reaction may include a rash, hives, itching, or swelling of the face, lips, tongue, or throat.


Q: Does Pimafucin have different names in other countries?

The brand name Pimafucin may vary depending on the country. However, the active ingredient is Natamycin, which is also referred to as Pimaricin in some chemical or regulatory documents.


Q: Do official documents mention any potential interactions with herbal supplements?

Official regulatory labeling documents state that the medicine's interaction profile is primarily localized. No interactions are documented with herbal products following topical application.


Q: What does research suggest about the use of Pimafucin for severe vs. mild infections?

Research studies generally monitor changes in clinical symptoms and the laboratory status of the fungal organism. The official evidence base is not typically categorized using the patient-defined terms of 'mild' versus 'severe' infections.


Q: Are there special considerations for using Pimafucin with a pre-existing liver condition?

Official regulatory documents typically state that no specific restrictions or dosage adjustments are required for patients with pre-existing hepatic (liver) or renal (kidney) impairment. This is due to the drug's localized application and minimal systemic absorption.


Q: Is it necessary to finish the entire course of Pimafucin treatment as described in package inserts?

General instructions for antibiotic-class medicines often include the regulatory statement that the full course of treatment should be completed. This instruction is intended to help address the infection entirely.


Q: What are the non-specific symptoms that might indicate a severe side effect of Pimafucin?

For the ophthalmic suspension, non-specific symptoms that could indicate a severe side effect may include a change in vision, eye pain, chest pain, or shortness of breath. These are reported in post-marketing data.


Q: Does the medicine carry a specific risk warning about potential long-term effects?

Official labeling notes that no long-term studies have been performed to evaluate the potential for carcinogenesis (causing cancer), mutagenesis, or impairment of fertility with Natamycin.


Q: Is it possible to become sensitive to Pimafucin after repeated use?

The primary safety constraint in official labeling is the potential for developing hypersensitivity reactions (an allergy) to the drug or its inactive ingredients. These types of allergic responses may develop upon exposure.


Q: What is the difference in purpose between Pimafucin cream and a generic natamycin cream?

Pimafucin and generic natamycin creams contain the same active ingredient, Natamycin, and are used for the same purpose, which is antifungal action. Any differences may exist in the inactive ingredients (excipients) or the specific regulatory approval held by the product.

How should Pimafucin be stored and disposed of?

How to Store and Dispose of Pimafucin? (Natamycin)

The medicine's stability is maintained through adherence to specific storage and handling requirements defined by regulatory documents.

Scope Element Official Regulatory Requirement
Storage Temperature Store between 2 C and 24 C (36 F and 75 F).
Environmental Control Do not freeze. Avoid exposure to light and excessive heat.
Packaging Rules Keep the container tightly closed and use only if the container is undamaged.
Child Safety Keep out of the reach of children.
Disposal Return unused or expired product to a pharmacist for disposal or handle in accordance with local requirements. The product must not be disposed of via wastewater.

The regulatory profile mandates controlled temperature storage within a narrow range and requires explicit protection from freezing and light to preserve the product. All medicines, including this one, must be stored out of the reach of children. Disposal instructions officially state that expired or unused medicine should be returned to a pharmacist or disposed of according to local waste regulations, prohibiting disposal into the sewer system.

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

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