Mycostatin

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Mycostatin

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Treatment option: Infection

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 Mycostatin

Property Description
Active Ingredient Nystatin
Forms Oral suspension, tablets, cream, ointment, powder
Pharmacological Class Polyene Antifungal Agent
General Purpose Control of fungal infections (mycoses)
Origin Natural (derived from Streptomyces noursei)

What Type of Medicine is Mycostatin (Nystatin)?

Mycostatin is the trade name for a medicinal entity whose active ingredient is Nystatin, classifying it as a polyene antifungal agent belonging to the broader antibiotic category. This drug is used primarily to address infections caused by susceptible fungi, notably those associated with Candida species. Its general use for managing localized fungal infections is clinically recognized. Nystatin's chemical structure is specifically a macrolide tetraene, which defines its mechanism and its placement within the polyene class of antifungals. Unlike many modern synthetic antifungal compounds, Nystatin has a natural origin, having been isolated from the soil bacterium Streptomyces noursei.


Forms, Composition, and General Purpose

The medication is a single-ingredient product available in multiple pharmaceutical preparations to ensure effective delivery. These forms include oral tablets and oral suspension intended for oral use, alongside preparations like cream, ointment, and powder designed for localized topical administration to mucosal surfaces and skin. The oral suspension form is often highlighted for its suitability in pediatric patients and those unable to swallow solid dosage forms, representing a key differentiator of this preparation. The composition features the active Nystatin compound combined with various inactive bases appropriate for the specific form. The fundamental purpose of Mycostatin is the control and elimination of fungal organisms.

Regulatory References

  1. Nystatin label (DailyMed)

What side effects are possible with Mycostatin?

Possible Side Effects and Safety Information

The safety profile for Mycostatin (Nystatin) is established through official regulatory documentation, detailing adverse reactions by frequency and body system. This section strictly reflects information documented in authoritative governmental sources, such as the FDA and EMA.

Adverse Reactions by Frequency

Adverse reactions are classified based on their expected occurrence:

Classification Examples of Reactions
Uncommon Diarrhea, abdominal discomfort, nausea, vomiting, skin rash.
Rare Hypersensitivity reactions, urticaria (hives), angioedema.
Very Rare Stevens-Johnson syndrome (SJS).

System-Organ-Class Involvement

Side effects are categorized by the primary body system affected:

  • Gastrointestinal Disorders: Include reports of diarrhea, nausea, vomiting, and abdominal discomfort.
  • Skin and Subcutaneous Tissue Disorders: Encompass rash, urticaria, and severe reactions such as SJS.
  • Immune System Disorders: Include allergic reactions and severe hypersensitivity events.

Serious Adverse Reactions and Safety Constraints

Rare but serious adverse reactions documented include Stevens-Johnson syndrome (SJS) and severe allergic responses (anaphylaxis). The medication is contraindicated in individuals with a known history of hypersensitivity to Nystatin or any of its components. Official labeling requires that treatment must be discontinued if local irritation or sensitization develops during use.

Population-Specific Safety Notes

Due to minimal gastrointestinal absorption, Nystatin is generally well-tolerated. However, official safety documentation includes:

  • Pregnancy: Classified as Pregnancy Category C. Should be used only if clearly needed, considering its low systemic absorption.
  • Lactation: Caution is advised when prescribing to nursing mothers, as it is not known if Nystatin is excreted in breast milk.

Overdose and Emergency Response

Overdose and When to Seek Help

The official regulatory information for Mycostatin (Nystatin) emphasizes that the drug is poorly absorbed from the gastrointestinal tract and skin. Consequently, life-threatening systemic toxicity is generally not expected following an acute overdose with oral or topical formulations, a fact reflected across official prescribing labels.

The clinical manifestations documented in regulatory sources following the ingestion of unusually large doses are primarily related to the gastrointestinal system. These reported presentations include nausea, diarrhea, and abdominal pain

. Due to this local focus and low systemic risk, the official treatment approach is symptomatic and supportive treatment.

Required Emergency Actions

In the event of a suspected or confirmed overdose, immediate medical attention is required, as mandated by government health authorities. Individuals must seek medical attention or contact a Poison Control Center for guidance. Clinical observation, often requiring hospital monitoring, may be necessary following the ingestion of substantial amounts, especially in pediatric patients who use the oral suspension. It is officially stated across regulatory documents that no specific antidote is known for Nystatin overdose.

Therapeutic Uses of Mycostatin

Mycostatin is commonly used to address the symptoms of localized infections caused by the Candida yeast, which is considered relevant in contexts involving heightened systemic burden. This medication is applicable in conditions presenting with symptoms of various candidiasis infections, including oral thrush (white patches in the mouth), skin fold rashes, and vaginal yeast infections. It is applied across domains where additional symptomatic support is needed, as it helps manage symptom clusters that may become intense or disruptive.

Mycostatin is relevant for easing challenging manifestations of the infection, which may include itching, burning, and soreness. It generally contributes to improved day-to-day comfort during symptomatic periods, offering symptomatic relief that may help patients cope more steadily with difficult episodes. This supportive care is commonly used in high-risk groups, including infants and individuals with certain underlying health conditions, to help manage bothersome symptoms that may otherwise create noticeable functional strain.

“This medication is used to relieve the discomfort associated with acute candidiasis episodes, supporting a more stable daily routine.”

Quick Fact: Relief for Localized Irritation and Soreness

Eligibility and Restrictions for Use

Who can and cannot use Mycostatin?

Mycostatin (Nystatin) eligibility is determined by official regulatory documents, focusing primarily on patient history, age, and the scope of the fungal infection.


Category Eligibility Rule
Absolute Contraindication Patients with a history of hypersensitivity to nystatin or any component of the specific preparation must not use this medicine.
Scope of Use The medicine is not indicated and must not be used for the treatment of systemic mycoses (deep, internal fungal infections).

Specific Population Eligibility

The medicine is generally established for use in adults, children, and infants (including newborns) for localized candidiasis. However, the use of tablets or lozenges is not recommended for children up to 5 years of age, as the oral suspension form is more appropriate and safer for this group. Patients with rare hereditary problems of fructose intolerance are contraindicated for oral suspensions containing sucrose.

Conditional Use Status

Use during pregnancy is conditional and should occur only if clearly needed, with potential benefits outweighing possible risks. Caution should be exercised during lactation as it is not confirmed whether the drug is excreted in human milk. Caution is also noted for patients with renal insufficiency, although minimal systemic absorption is expected.

What should I know about interactions with other medicines?

Interactions with other medicines and products — official regulatory information for Mycostatin (Nystatin)


Interaction Scope

Property Official Regulatory Statement
Medicinal Product Categories Local antifungal agents (polyene antibiotics), Azole antifungals.
Specific Interacting Medicines Clotrimazole; other polyene antibiotics such as Natamycin and Amphotericin B.
Mechanistic Basis Local pharmacodynamic antagonism or reduction of effect.
Timing-Based Rules None documented for systemic interaction avoidance.
Population-Specific Note Renal insufficiency (potential for significant plasma concentrations to occur during oral therapy).
Systemic Restrictions None documented for systemic co-administration.

Resulting Interaction Structure

Official Interaction Statements:

  • Negligible Systemic Interaction Potential: Official prescribing information consistently states that Nystatin is absorbed very sparingly from the gastrointestinal tract, and no detectable blood levels are attained at recommended oral doses. This characteristic eliminates the risk for systemic pharmacokinetic interactions with other medicines, such as those related to CYP enzymes or transporters.
  • Local Pharmacodynamic Interaction: Simultaneous local use with Clotrimazole or other polyene antibiotics may result in the lowering of the co-administered agent's activity at the local site of action.
  • Pharmacokinetic Caution in Clearance Impairment: Although systemic absorption is minimal, patients with renal insufficiency receiving oral therapy may occasionally attain significant plasma concentrations of Nystatin.

The regulatory interaction profile for Nystatin is defined by its negligible systemic absorption, which accounts for the absence of documented systemic drug–drug interaction studies. The established restrictions are limited to a potential reduction of effect from local pharmacodynamic antagonism and a pharmacokinetic caution regarding increased exposure in the specific population of patients with renal impairment.

Mechanism of Action

How Mycostatin Works

Mycostatin (Nystatin) is a polyene antifungal agent that functions by directly disrupting the structural integrity of the fungal cell membrane. The mechanism begins with the drug's specific binding to ergosterol, a sterol molecule that is uniquely present in the cell membranes of susceptible fungi, such as Candida species. This targeted interaction contributes to selective toxicity toward fungal cells, as the drug exhibits negligible affinity for cholesterol found in human cells.

Following binding, multiple Mycostatin molecules aggregate within the lipid bilayer to form trans-membrane pores or channels . This physical disruption compromises the membrane's selective barrier function, causing a rapid increase in its permeability. The creation of these defects results in the uncontrolled leakage of essential intracellular contents, including vital ions like potassium ( K^+) and small metabolites. This rapid collapse of the cell’s electrochemical and osmotic balance severely disrupts essential cellular processes, leading to a fungicidal (cell-killing) effect.

Dosage and Administration Information

How Mycostatin (Nystatin) is Used

The usage of Mycostatin, which contains the active ingredient Nystatin, is defined by its method of localized administration. The medication is not absorbed systemically in meaningful amounts, thus its effectiveness depends on direct contact with the fungal infection site. Established guidelines detail specific routes, unit doses, and administration techniques for its various forms.


Dosing and Administration Patterns

Mycostatin is administered via three primary routes, each corresponding to a specific dosage form and requiring a distinct frequency and technique:

Route Typical Adult Dosing Range Standard Frequency Administration Specifics
Oral Suspension 400,000 to 600,000 units per dose Four times daily (q.i.d.) Must be swished and held in the mouth for as long as possible before swallowing to maximize local contact.
Oral Tablets 500,000 to 1,000,000 units per dose Three times daily (t.i.d.) Used for non-localized intestinal candidiasis.
Topical/Vaginal 100,000 units per dose or per gram Once or twice daily Topical powder is used for very moist lesions; vaginal preparations are used continuously, regardless of menstruation.

Procedural and Duration Guidelines

Treatment is maintained for a defined period to ensure elimination of the fungal organism. Administration is continued for a minimum of 48 hours after symptoms have disappeared and clinical cure is achieved to prevent recurrence. Dosage for infants and premature babies is adjusted, typically starting at 100,000 to 200,000 units of the oral suspension per dose, administered four times daily. Due to Nystatin’s poor systemic absorption, no specific dose adjustment is needed for patients with kidney or liver impairment.

Recent Clinical Evidence

Research Evidence / Overview of Studies for Mycostatin

Evidence for Treating Oral Candidiasis (Thrush)

Research exploring Mycostatin for yeast infections in the mouth has primarily involved Randomized Controlled Trials (RCTs), alongside larger systematic reviews and meta-analyses that combine the findings of multiple trials. These studies were designed to measure two key outcomes: the clinical resolution rate, which tracked the disappearance of visible lesions and symptoms, and the mycological clearance rate, which assessed whether the fungus was eliminated according to laboratory culture results. Studies report patterns of change in both clinical signs and fungal presence when Mycostatin was compared to an inactive control group.

What remains uncertain is the performance of Nystatin in direct comparisons against newer, systemic drugs, especially in individuals with compromised immune systems, where certainty remains low. Furthermore, many older studies contributing to this evidence base have been noted to have certain methodological limitations, and there is limited information for long-term outcomes or sustained outcomes beyond a few months of follow-up.


Evidence for Use in Fungal Infection Prevention (Prophylaxis)

Mycostatin was evaluated in research exploring the incidence of fungal infections, a concept known as prophylaxis. This research is founded upon numerous RCTs and subsequent meta-analyses that aggregate findings, particularly in vulnerable hospital populations. Research focused on the incidence rate of systemic fungal infections (SFI)—deep, more serious infections—and the rate of fungal colonization (the presence of yeast on mucosal surfaces).

These studies primarily focused on Very Low Birth Weight (VLBW) infants and other high-risk premature neonates. Aggregated data show patterns related to fewer recorded instances of fungal colonization and, often, systemic infection rates in the groups observed with Nystatin, compared to control groups receiving standard care without Nystatin. Research exploring overall patient mortality during these studies did not describe significant differences between the study groups.


What is Still Uncertain About Mycostatin

Research provides context but not individual predictions, and evidence highlights what is known—and what is still uncertain. Comparative evidence is lacking or inconclusive when comparing Mycostatin head-to-head against all newer, non-polyene antifungal agents. Long-term effects are not fully established; research has explored short-term symptom changes, but there is limited information for outcomes beyond a few months. Data for certain groups, such as non-pediatric immunocompromised adults, remain insufficient to draw broad conclusions regarding clinical performance.

Key Studies & References

  1. Therapeutic Role of Nystatin Added to Tissue Conditioners for Treating Denture-Induced Stomatitis: A Systematic Review
  2. Nystatin Oral Suspension: Package Insert / Prescribing Info (FDA DailyMed)

Frequently Asked Questions (FAQ)

Common questions about Mycostatin (FAQ)


Q: Is it common for the treated infection to return after a course of Mycostatin is completed?

Official regulatory documents state that treatment should be continued for a minimum of 48 hours after all symptoms have cleared. The purpose of this required continuation period is to avoid the possibility of the infection relapsing or recurring. Continuing for the full prescribed duration is defined in official documents as a necessary step to achieve a clinical cure.


Q: Does the topical form of Mycostatin commonly cause skin irritation or a burning sensation?

The official product information for the topical formulation lists localized irritation as a possible adverse reaction. This can include symptoms such as itching, pain, and a burning sensation where the product is applied. The product information states that treatment must be discontinued if local irritation or sensitization develops.


Q: Are there specific warning signs that could indicate a severe or unusual reaction to Mycostatin?

Severe reactions to Mycostatin are rare. Regulatory-derived patient information describes the signs of a severe reaction, such as hives, swelling of the face, tongue, or throat, and difficulty breathing. Symptoms of a serious skin reaction, such as blistering, peeling skin, or sores in the mouth or eyes, are classified as severe adverse reactions in official safety documents.


Q: How is Mycostatin (Nystatin) different from other antifungal drugs like Fluconazole?

Mycostatin (Nystatin) is chemically classified as a polyene antifungal agent. This places it in a different pharmacological category than medicines like Fluconazole, which is classified as an azole antifungal agent. These classification differences reflect fundamental distinctions in chemical structure and the mechanism by which the drugs work.


Q: What is the difference between an antifungal that is 'fungistatic' and one that is 'fungicidal' (in relation to Mycostatin)?

Pharmacological descriptions of Nystatin show that it has two modes of action against susceptible fungi: fungicidal and fungistatic. A fungicidal effect means the drug actively kills the fungal cells, while a fungistatic effect means it stops the growth of the fungus. Nystatin is described as possessing both of these activities.


Q: Is Mycostatin used to treat both yeast and mold infections, or is it specific?

Official drug monographs indicate that Nystatin is active against a wide range of yeasts and yeast-like fungi, particularly Candida species. Studies have also shown that Nystatin can exhibit activity against certain molds, including Aspergillus niger. The primary indications for Mycostatin are defined in official labeling as addressing infections caused by Candida species.


Q: Do the side effects of Mycostatin usually go away as the body adjusts to the medication?

Patient information derived from regulatory data indicates that side effects, particularly common gastrointestinal issues like nausea or diarrhea, often begin to resolve. These effects have been noted to often lessen as the body adjusts to the medication.


Q: Is a bad or bitter taste in the mouth a common experience when using the oral suspension?

Yes, official prescribing information has reported that oral formulations of Mycostatin can cause taste disturbances. Some patients may experience an unpleasant or bitter taste in the mouth while using the oral suspension.


Q: Does Mycostatin typically have known interactions with common over-the-counter pain relievers?

Regulatory-derived patient information indicates that Nystatin in its various forms has no known systemic interaction with common over-the-counter painkillers. This lack of systemic interaction applies to common pain relievers like acetaminophen or ibuprofen.


Q: Is it generally known if Mycostatin interacts with any common vitamins or mineral supplements?

Official regulatory sources state that there is currently insufficient data available to confirm the potential risks of using Nystatin with complementary medicines, herbal remedies, or supplements. This lack of sufficient data is noted in official guidance.


Q: Are there any food or drinks that might interfere with how Mycostatin works?

According to patient guidance based on regulatory data, there are no specific types of food or drink that are documented to interfere with how Mycostatin works. No special dietary changes are noted in official patient guidance regarding its use.


Q: What is the difference between the pure Mycostatin topical form and combination creams that include steroids?

Regulatory documents from some countries indicate that Nystatin is used in fixed-dose combination products. These creams combine Nystatin along with other types of medicines, such as corticosteroids or antibiotics, to address fungal infections that may be accompanied by inflammation or secondary infections.


Q: Does Mycostatin have a broad or narrow spectrum of antifungal activity?

Nystatin is categorized in pharmacological monographs as having a broad spectrum of activity. This means it is effective against a wide variety of yeasts and fungi, rather than being limited to only a single type of organism.


Q: Does using Mycostatin affect the effectiveness of birth control pills or other hormonal contraceptives?

There are two points to note regarding contraceptives. First, the vaginal forms of Nystatin may weaken latex condoms or diaphragms. Second, a potential side effect, such as severe diarrhea, may interfere with the absorption and effectiveness of hormonal birth control pills.


Q: Is Mycostatin known to cause antifungal resistance in the organisms it treats?

The prolonged or improper use of any antifungal treatment is generally recognized in pharmacological literature as a factor that can contribute to the potential emergence of resistant strains of organisms. The importance of adhering to the prescribed duration is related to minimizing the potential for the emergence of resistance.

How should Mycostatin be stored and disposed of?

How to Store and Dispose of Mycostatin (Nystatin)

Official instructions for Mycostatin storage and disposal are mandated to maintain product stability and ensure safety.


Storage Requirements

Mycostatin must be stored at room temperature, typically between 15 C and 30 C (59 F and 86 F). The medication must not be frozen and should be protected from excessive heat and moisture. The Oral Suspension container must be kept tightly closed. A critical requirement across all forms is to keep the product out of the reach of children.


Disposal Guidelines

Unused or expired Mycostatin should be disposed of according to local regulations, preferably through a medicine take-back program if one is available. The product must not be flushed down a sink or toilet to prevent environmental contamination, unless specifically authorized by local health authorities.

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

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