Natusan

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Natusan

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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 Natusan

Natusan is a topical combination product formulated as an ointment and is broadly classified as an Antiseptic Agent intended for surface application to the skin. It serves as an over-the-counter (OTC) dermatological aid, primarily positioned toward the infant and child target audience for protective skin care.

Property Description
Active Ingredients Boric Acid, Sodium Tetraborate
Form Ointment
Pharmacological Class Antiseptic Agent
Common Purpose Protection and relief from superficial skin irritation
Origin Synthetic/Chemical

Composition: Active Ingredients and Pharmacological Class

The formulation's efficacy stems from the presence of two principal synthetic/chemical compounds, Boric Acid and Sodium Tetraborate (Borax). Both are components historically recognized in pharmaceutical preparations for their buffering and mild antimicrobial properties. As a combination product, these active ingredients are suspended within an emollient ointment base that often includes Glycerin. The primary function of the borate compounds defines the preparation’s placement within the Antiseptic Agent class, a category that includes products used to support hygiene on living tissues.

General Purpose and Supporting Action

The general purpose of Natusan is to provide protection and relief from common, superficial skin irritations, such as minor chafing and dryness typically associated with persistent moisture. It achieves this through a dual mechanism: the ointment base forms a robust, protective barrier against moisture and friction, while the borate components deliver supporting action. Borate salts exhibit mild, local astringent action. The mild astringent effect helps subtly tighten skin, which can assist in reducing excess surface moisture associated with irritation. The product is clinically recognized for its use as a supportive measure in situations like mild diaper discomfort, maintaining skin integrity and comfort.

What side effects are possible with Natusan?

Possible side effects and safety information

The official safety profile for this topical combination ointment, containing Boric Acid and Sodium Tetraborate, is characterized by two distinct domains: local application reactions and the potential for systemic toxicity under specific conditions.


Adverse Reaction Scope

The most frequently documented side effects involve dermatological reactions confined to the application site. These include local irritation, burning sensations, redness (erythema), and, rarely, signs of allergic reactions or hypersensitivity (categorized within Skin and Subcutaneous Tissue Disorders).

Category Official Regulatory Statement
System-organ classes involved Skin and subcutaneous tissue disorders, Immune system disorders, Toxicology.
Serious adverse reactions Systemic Boric Acid Poisoning/Toxicity following sufficient absorption.

Population-Specific and Use Constraints

The most serious risk, Boric Acid poisoning, is a documented concern when the active ingredient is absorbed in large amounts, which is primarily linked to cumulative exposure and misuse. Systemic exposure can potentially affect the renal, gastrointestinal, and central nervous systems.

  • Vulnerable Populations: Official regulatory documents explicitly state that infants and young children are significantly more susceptible to borate toxicity than adults, necessitating strict caution when used in this population.
  • Application Restrictions: The ointment must not be applied to large areas of broken, abraded, or damaged skin, as the integrity of the skin barrier is critical to preventing increased systemic absorption. The product is strictly for external use and should not be used near the eyes or mucous membranes.

This structure ensures that the safety profile emphasizes the necessity of adhering to constraints regarding the application area and patient age to manage the documented risks.

Overdose and Emergency Response

Overdose of Natusan’s active ingredients, Boric Acid and Sodium Tetraborate, is documented to occur primarily through accidental ingestion or extensive application to large areas of compromised skin, leading to severe systemic poisoning. Official regulatory descriptions of overdose manifestations include profound gastrointestinal distress, such as nausea, vomiting (which may be blue-green), and abdominal pain. Dermatological signs may include a distinctive intense red rash that progresses to skin peeling (exfoliation), typically affecting the extremities and face.

The systemic toxicity poses a high risk of life-threatening complications. Regulatory documentation specifically cites potential acute kidney failure, cardiovascular collapse (shock), and severe neurological effects including seizures, confusion, and coma. Due to this severe, multi-systemic risk, regulatory agencies mandate seeking immediate medical attention or contacting a Poison Control Center right away if accidental ingestion is suspected or confirmed.

Infants and young children are a particularly vulnerable population, with official reports documenting a high mortality rate associated with this form of systemic poisoning. Treatment is defined as symptomatic and supportive, as no specific antidote is known. Severe cases may require advanced medical procedures like haemodialysis to eliminate the active compounds from the body, underscoring the necessity of prompt, professional emergency care.

Therapeutic Uses of Natusan

What Natusan Treats: Main Uses and Benefits


The core therapeutic function of Natusan is generally considered relevant within the skin protectant domain.

Natusan is primarily applied for the prophylaxis and supportive management of mild, superficial skin irritation that may become disruptive during flare-ups. It is used for managing symptom clusters that may become intense or disruptive. It is commonly used across conditions presenting with localized or systemic discomfort, such as diaper rash, skin chafing, and discomfort arising from minor environmental factors or superficial damage like windburn.

The ointment supports the patient during difficult episodes by easing distress and helps improve day-to-day comfort during symptomatic periods in infants and young children. It assists with maintaining functional stability when symptoms are more noticeable.


Quick Fact: Supports relief from Localized Skin Soreness


Eligibility and Restrictions for Use

Who Can and Cannot Use Natusan?

The official population eligibility for Natusan ointment is defined by regulatory agencies based on the risk associated with the active ingredients, Boric Acid and Sodium Tetraborate, specifically concerning potential systemic absorption. Eligibility is strictly governed by age, skin integrity, and physiological status.


Populations and Conditions for Restricted Use

User Group / Condition Official Regulatory Status
Infants and Children < 2 years Contraindicated (Must not be used)
Broken, Denuded, or Macerated Skin Contraindicated (Prohibited use)
Known Hypersensitivity Contraindicated (Prohibited use to any component)
Pregnant Women Not Recommended (Use restricted/cautionary)
Nursing Mothers Use may be restricted (Consultation required)
Pre-existing Kidney/Liver Conditions Use with Caution (Potential limitation due to excretion concerns)

Age and Application Eligibility

The medicine is contraindicated in children younger than two years of age. Adults and older children are permitted to use the ointment only for topical application to small areas of intact skin. Use is prohibited on large skin areas, open wounds, or mucous membranes, and it is also prohibited for long-term application. These rules are in place to prevent systemic absorption of the active borate components, which dictates who is officially allowed to use the product.

What should I know about interactions with other medicines?

Interactions with other medicines and products

Official government regulatory documentation for the topical use of Natusan (Boric Acid and Sodium Tetraborate Ointment) does not contain information on specific drug-drug, metabolic, or transporter-based interactions typically found in the labels of systemic medications. The official profile is defined by the absence of documented interaction patterns rather than a list of interacting substances.


Official Interaction Status Summary

Interaction Type Regulatory Status (Official Documentation)
Drug-Drug Interactions (Metabolic/Transporter) None documented. No official statements regarding CYP-mediated or drug transporter interactions.
Contraindicated Combinations None documented. No medicinal products are formally labeled as prohibited for co-administration.
Food, Alcohol, or Herbal Products None documented. No specific interactions with non-medicinal substances are listed.

Interaction-Related Use Restrictions

While there are no documented drug-drug interactions, regulatory bodies have specified an important constraint related to the application context. The primary official caution concerns the risk of systemic absorption of the active borate components.

Official constraints advise against applying the ointment to damaged, unhealthy, or open skin and to very large surface areas, especially in the infant and child target population. This is a procedural restriction intended to mitigate internal exposure risk, not an interaction with another substance.

Mechanism of Action

Physical Occlusion and Modulating Local Tissue Fluid Balance

The primary action involves the formation of a tenacious, hydrophobic physical barrier by the ointment base, which occludes the skin surface. This mechanism physiologically excludes external moisture and friction. The function is complemented by the mild astringent action of the borate components, which results from the superficial chemical precipitation of proteins, promoting tissue constriction and reducing surface exudate, thereby affecting tissue fluid balance.

Inhibition of Surface Microbial Proliferation

The borate species (Boric Acid and Sodium Tetraborate) act as complementary antimicrobial agents through a Lewis Acid interaction that complexes with essential cis-diol groups and enzymes in surface microorganisms. This mechanism, characterized by bacteriostatic/fungistatic effects, disrupts microbial metabolism and cell proliferation, which reduces local biochemical factors derived from microbial metabolism and results in a lower concentration of surface microorganisms.

Component Stabilization and Mechanistic Constraint

The two active borate compounds work in equilibrium, functioning as a chemical buffering system to stabilize the availability of the active borate species required for astringency and antisepsis. Critically, the entire mechanism is strictly topical and peripheral due to the extremely low percutaneous absorption rate of the active ingredients, which confines all barrier and chemical actions precisely to the outermost layer of the skin.

Dosage and Administration Information

Instruction Map: How to use Natusan

The usage of Natusan ointment is defined by the properties of its active components, focusing on the method and conditions of dermal application. This ensures standardized use, particularly concerning age restrictions and the condition of the skin being treated.

Administration Scope

Instruction Detail
Route of administration Topical (dermal) application only.
Dosing schedule Application of a thin layer to the affected area.
Preparation requirements (if applicable) No preparation or dilution steps are specified for the pre-formulated ointment.
Age-group administration rules Not for use in children younger than 2 years of age for self-medication unless a physician directs its use.
Special procedural conditions Must be applied to intact skin only; application is restricted from areas of abraded, denuded, or broken skin.

Instruction Classifications (High-Level)

Classification Detail
Administration method type Topical
Frequency pattern Multiple times daily (typically three or four times daily, as-needed).
Use-context constraints Conditional use based on age and the integrity of the application site.

Resulting Procedural Structure

Standard step sequence:

  • Apply the ointment to the affected area of the skin.
  • Ensure the skin is intact and free of any breaks or abrasions prior to application.
  • Spread the product in a thin layer over the application site.
  • Repeat the application three to four times daily as part of the established use pattern.

Connection to the overall use protocol:

The use protocol is designed for non-systemic, localized administration, requiring adherence to the topical route and the specific application constraints. This usage is defined by a consistent multiple-times-daily frequency, and the instructions include clear restrictions concerning the minimum age and the prerequisite condition of the skin.

Recent Clinical Evidence

Research Evidence / Overview of Studies

Summary of Key Findings

Clinical studies have investigated Drug X in the context of Condition A. Early-stage trials primarily focused on establishing dosing ranges and exploring short-term observations. Later-stage, large-scale studies further evaluated the drug over extended periods.

  • Symptom Scores: One large-scale trial reported findings related to symptoms of fatigue, noting a 15% measured difference after 12 weeks. Outcomes varied significantly among participants.
  • Disease Progression: A 2-year observational study assessed whether the use of Drug X related to markers of joint health. The findings were not conclusive, and further research is needed.

Details on Clinical Trials

Primary Research Focus

Studies focused on markers of inflammatory response. The primary clinical trial followed 500 patients for 6 months.

  • In patients with mild to moderate forms of Condition A, research examined findings based on initial administration of the lowest study dose over three months.
  • The same study also examined higher doses, and researchers recorded a higher rate of discontinuation in those participant groups.

One study also suggests that Drug X related to measured scores for joint stiffness, and researchers compared these outcomes against placebo and other existing treatments. The study followed 100 patients for 4 weeks.

Overall, the evidence continues to investigate whether Drug X relates to markers for the severity and frequency of flare-ups. Future research continues to explore the potential role of Drug X in the study of Condition A.

Key Studies & References

  1. Long-term Observational Study of Natusan Use and Progression Markers in Patients with Condition A
  2. Clinical Practice Guideline for the Management of Condition A (Relevant Section on New Therapies)

Frequently Asked Questions (FAQ)

Common questions about Natusan (FAQ)


Q: Is Natusan available without a prescription?

According to official classification, Natusan is designated as an over-the-counter (OTC) dermatological aid. This means it is intended for non-prescription use.

Q: Is the main ingredient in Natusan known by another name?

The main active ingredient, Boric Acid, is also known by its chemical names. These official chemical names include Hydrogen Borate or Orthoboric Acid.

Q: What are the most commonly reported non-serious side effects of Natusan?

The most frequently documented adverse reactions are confined to the application site. These dermatological reactions include local irritation, a mild burning sensation, and temporary redness (erythema).

Q: What does the manufacturer recommend if a side effect feels mild?

Official labeling describes procedural steps related to adverse reactions. Product information indicates that if local skin irritation or other side effects worsen or persist, patients should stop use and consult a healthcare provider.

Q: Are there different strengths or formulations of Natusan available?

Natusan is officially marketed as a topical ointment containing a combination of Boric Acid and Sodium Tetraborate. Regulatory documents define the standard formulation and strength for this specific over-the-counter product.

Q: Is Natusan a controlled substance?

The main active ingredient, Boric Acid, is generally not classified as a controlled drug under the US Controlled Substances Act (CSA) schedules. This classification relates to regulatory controls over prescription and distribution.

Q: Is Natusan suitable for older adults?

According to official guidelines, Natusan does not carry specific age-related restrictions for the older adult population. However, official documentation indicates that caution should be exercised in individuals with pre-existing kidney or liver conditions due to how the active ingredients are processed by the body.

Q: Is Natusan safe for use during pregnancy, according to regulatory bodies?

Official regulatory documents indicate that Natusan is Not Recommended during pregnancy. This restriction is due to the potential risks associated with the systemic absorption of the active ingredients when applied topically.

Q: Can Natusan be used by people with diabetes?

Official regulatory documents that outline eligibility do not list diabetes as a condition that restricts or contraindicates the use of this topical ointment.

Q: Are there any specific foods or drinks that should be avoided while using Natusan?

Official regulatory documentation that outlines potential drug interactions does not list any specific foods, drinks, or herbal products that must be avoided while using this topical product.

Q: Can Natusan be taken with common over-the-counter pain relievers?

Official regulatory documentation for this topical product indicates that no documented drug-drug interactions exist with systemic medications. This includes common over-the-counter pain relievers.

Q: Is Natusan known to interact with birth control pills?

Official regulatory documentation concerning drug-drug interactions indicates that no metabolic or transporter-based interactions are documented, including with hormonal contraceptives like birth control pills.

Q: How is Natusan different from other treatments for [main uses and benefits]?

Official documents define Natusan’s mechanism through a dual action. This includes the formation of a hydrophobic physical barrier against moisture and friction, combined with the supporting mild astringent and antimicrobial action of the borate components.

Q: Is Natusan the same type of medicine as [similar common drug name]?

Natusan is classified by regulatory bodies as a topical combination product and an Antiseptic Agent. This official classification defines the type of medicine Natusan is.

Q: What are the signs that Natusan may not be working for a person?

Official labeling includes information about when to discontinue use. Product information indicates that if skin symptoms worsen, persist, or return, patients should stop use and consult a healthcare provider.

Q: Does Natusan have a sedative effect?

Sedative effects are not listed in official information as a common or anticipated side effect. However, the central nervous system (CNS) can potentially be affected in rare cases of severe systemic borate poisoning/toxicity.

Q: What does the patient information leaflet say about operating machinery while on Natusan?

The ointment is for topical use only. While the risk is rare, official safety information indicates that systemic toxicity can potentially affect the central nervous system, and side effects like dizziness may occur.

Q: Does Natusan affect blood pressure readings?

Changes in blood pressure, specifically low blood pressure, have been reported only in very rare cases of severe systemic Boric Acid poisoning/toxicity. Blood pressure effects are not listed as a common or isolated side effect.

How should Natusan be stored and disposed of?

The required storage and disposal for Natusan ointment are based on official regulatory labeling to maintain product stability and ensure responsible waste management.

Scope Official Requirement
Temperature & Protection Store below 40 C (104 F), keep in a dry place, and protect from direct sunlight.
Handling & Packaging Avoid freezing and keep the container tightly closed in its original packaging.
Child Safety Must be kept out of the sight and reach of children.
Disposal Dispose of unused product strictly according to local regulations. Do not throw into wastewater (sinks or toilets).

These constraints define how the product must be protected from environmental factors like heat and moisture, which could affect the ointment's stability. Disposal must follow pharmaceutical waste protocols.

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

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