Ichthyol

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Ichthyol

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Medically reviewed

Marina Burgos

Last updated on 22/12/2025

This page provides general, reference-level information compiled from official medical sources. It is not a substitute for professional medical advice, diagnosis, or treatment. For decisions about your health, please consult a qualified healthcare professional.

Overview of Ichthyol

Quick Facts

Property Description
Active ingredient Ichthammol (Ammonium bituminosulfonate)
Form Ointment, Paste, Lotion, Suppositories
Pharmacological class Anti-inflammatory and Antiseptic Dermatological Agent
General purpose Symptomatic relief for local skin inflammation
Origin Naturally derived from sulfonated oil shale

What is Ichthyol and Its Defining Component?

Ichthyol is a medicinal entity based on the active ingredient Ichthammol, which is chemically identified as Ammonium bituminosulfonate. This substance is clinically recognized for its role as a specialized dermatological preparation intended primarily for local, topical application. The preparation is naturally derived, originating from the destructive distillation and subsequent sulfonation of sulfur-rich oil shale, resulting in a unique bituminous compound. This process yields a distinct, dark, viscous material with significant organically bound sulfur content, which is a differentiating factor compared to simple mineral oil-based topical agents and is recognized in pharmaceutical standards, including the European Pharmacopoeia (Ph. Eur.).

What Type of Medicine is Ichthyol and What Forms Does it Come In?

Ichthyol is categorized as an Anti-inflammatory agent and a mild Antiseptic due to its characteristic physiological effects on the skin. It is most commonly prepared for topical application in several physical dosage forms, including Ointment, Paste, and Lotion.


As a rule, Ichthammol is a single-active ingredient incorporated into various bases, such as Petrolatum or Glycerin, which influence the preparation's texture and application. These forms dictate the appropriate route of administration, which is primarily topical to the skin, though specialized preparations like Suppositories exist for rectal use. The substance has an established use in easing discomfort associated with localized inflammatory skin processes in European regions.

What is the General Purpose of This Preparation?

The general purpose of Ichthyol is to provide symptomatic relief and assist the natural resolution of superficial, localized inflammatory processes. This function is achieved through combined actions, including an Anti-inflammatory action and a Mild local anesthetic and Antipruritic effect to help relieve discomfort and itching. The preparation functions as a topical anti-infective agent. These synergistic physiological actions establish the preparation's utility in supporting the body's healing processes in the affected area.

Regulatory References

  1. European Pharmacopoeia (Ph. Eur.) 11th Edition
  2. Ichthammol (10%) drug label on DailyMed (NIH)

What side effects are possible with Ichthyol?

Possible Side Effects and Safety Information

The safety profile for Ichthyol, which contains the active ingredient Ichthammol (Ammonium bituminosulfonate), is predominantly characterized by localized reactions at the site of application, as documented in official government regulatory documents.

Adverse Reactions and Regulatory Scope

Adverse effects are primarily classified under Skin and Subcutaneous Tissue Disorders. The most consistently documented events include localized manifestations of skin irritation, such as redness, swelling, or pain. The potential for allergic reactions to Ichthammol or to excipients, such as lanolin (wool fat), is also noted in regulatory documentation.

Classification Feature Regulatory Status
Frequency Classification Not Known (Standard frequency categories are not assigned in the reviewed official labels)
Systemic Reactions None are explicitly defined as Serious Adverse Reactions in the official regulatory documents

Safety Constraints and Special Populations

Official labeling establishes clear constraints for use. The preparation is contraindicated in individuals with a known hypersensitivity to Ichthammol or any other component in the formulation. Furthermore, regulatory documentation notes a data gap concerning certain populations: the safety of Ichthammol during human pregnancy and lactation has not been investigated through dedicated studies. The official Summary of Product Characteristics states that there are no known interactions with other medicinal products when this preparation is used topically.

Overdose and Emergency Response

Ichthyol Overdose and when to seek help

The official regulatory profile for Ichthammol, a topical agent, is constrained to address the risk of accidental oral ingestion, as systemic overdose is not associated with standard topical application. The potential for severe systemic effects from ingestion is the basis for mandated emergency actions.

Documented Overdose Presentations and Outcomes

Regulatory documents report that acute, high-dose oral toxicity may present with severe systemic effects. These documented manifestations include life-threatening outcomes such as acute pulmonary oedema affecting the respiratory system and signs of central nervous system toxicity, including coma. Less severe, yet documented, gastrointestinal disturbances may include nausea and vomiting. Official sources explicitly state that these severe systemic effects are unlikely to result from appropriate topical use.

Required Emergency Response

The potential severity of ingestion dictates the required emergency action. Regulatory authorities mandate that if the product is swallowed, individuals must seek immediate medical help or contact a Poison Control Center right away. This critical instruction is explicitly highlighted alongside warnings concerning the pediatric population, which is the primary regulatory concern for accidental ingestion. Treatment for documented overdose consists of symptomatic and supportive measures, as official prescribing information does not list a specific antidote.

Therapeutic Uses of Ichthyol

What Ichthyol Treats: Main Uses and Benefits

Ichthyol (Ichthammol) is a specialized topical preparation that is commonly used to provide supportive symptomatic relief across key areas of localized skin discomfort and irritation. It is relevant for managing symptoms associated with specific acute and chronic inflammatory processes. The preparation is intended for symptomatic relief in situations requiring short-term assistance for minor skin irritations.

Therapeutic Scope

The preparation is relevant for managing conditions characterized by heightened symptoms, including boils (furuncles), small abscesses, minor skin infections, and certain forms of eczema and dermatitis. In these scenarios, it is used to help address symptom clusters like localized redness, swelling, persistent itching, and discomfort. This contributes to easing the overall symptom load during acute episodes and supports day-to-day comfort in chronic situations. Specialized forms are also used to help ease localized burning and irritation associated with conditions such as anal fissures and internal hemorrhoids.

Quick Fact: Relief for Localized Skin Symptoms
Main Symptom Focus Redness, swelling, and persistent itching
Common Contexts Acute boils, chronic eczema, minor irritations
Primary Benefit Contributes to easing the symptom load and discomfort

Regulatory References

  1. NIH DailyMed Label for Ichthammol Ointment

Eligibility and Restrictions for Use

Who Can and Cannot Use Ichthyol?

The population eligibility for Ichthyol (Ichthammol), regulated primarily as an Over-The-Counter (OTC) topical preparation, is defined by absolute contraindications and mandatory conditional restrictions.


Contraindications and Restrictions

Classification Rule Applicable Population/Context
Absolute Contraindication Must not be used. Individuals with a known hypersensitivity or allergy to Ichthammol or any ingredient in the formulation.
Application Site Restriction Must not be used. Do not apply the preparation in the eyes or to deep puncture wounds or serious burns (conditional use applies).

Conditional and Age-Based Eligibility

Conditional Use: Official regulatory labeling specifies that patients with deep puncture wounds or serious burns must consult a doctor before use, establishing a clear limitation based on injury severity.

Pregnancy and Lactation: Due to limited or uninvestigated safety data, women who are pregnant or breastfeeding are officially advised to consult their healthcare provider prior to use.

Age Groups: Ichthyol is generally established for use in the adult and elderly populations. Some regulated formulations confirm eligibility for children (e.g., under 12 years), though the general safety instruction to “Keep out of reach of children” applies to all forms.

What should I know about interactions with other medicines?

Interactions with other medicines and products

The official regulatory profile for Ichthyol (Ichthammol) is based on its classification as a topical Over-the-Counter (OTC) dermatological agent. Due to the product's topical route of administration and minimal systemic absorption, the risk for systemic drug interactions is generally considered low. Consequently, major government prescribing information does not formally contain a detailed drug-drug interaction section.

Interaction Scope Summary

Category Official Regulatory Status
Specific Interacting Medicines None formally documented for systemic interactions.
Mechanistic Basis No formal documentation of metabolic (CYP) or transporter-mediated interactions.
Food, Alcohol, Herbal Products No formal documentation of specific interactions or restrictions.
Timing/Separation Rules No mandatory timing separation requirements documented for co-administered medicinal products.

Official Interaction Statements

  • No formal statements exist in the regulatory labeling detailing pharmacokinetic or pharmacodynamic interactions with co-administered systemic medications.
  • There are no explicitly listed contraindicated systemic drug combinations provided in the official regulatory labels.
  • Interaction-related constraints are limited to the active substance itself: Ichthammol is chemically incompatible with specific agents, including Acids and Alkali Salts. This is a consideration for formulation and compounding stability.

The regulatory documents define the product's interaction structure primarily through the absence of specific warnings regarding systemic interactions, consistent with its intended use and low absorption profile.

Mechanism of Action

Enzymatic Suppression of Inflammatory Signals

Ichthammol (Ammonium bituminosulfonate) exerts a local enzyme inhibitor effect, primarily targeting Cyclooxygenase (COX) and 5-Lipoxygenase (5-LO) within the arachidonic acid cascade. By suppressing the activity of these enzymes, the compound reduces the synthesis of powerful inflammatory mediators, such as Prostaglandins and Leukotrienes. This action is a key molecular step contributing to the local modulation of tissue edema and erythema.


Dampening of Peripheral Sensory Nerves

A separate mechanistic domain involves the modulation of peripheral sensory nerve endings (nociceptive C-fibers). This local interaction helps stabilize nerve membranes, dampening the transmission of signals for pain and itch (pruritus). This targeted, peripheral mechanism results in the dampening of nociceptive and pruritic signal transmission, which defines its sensory modulation profile.


Physicochemical and Keratoplastic Modulation

The active substance also engages in a physicochemical interaction with structural epidermal proteins and certain protease enzymes (e.g., Kallikrein-5). This property is mechanistically associated with keratoplastic action. The modulation helps to soften and loosen the compacted outer layers of tissue, leading to the modulation of epidermal cell turnover and the separation of compacted tissue layers.

Dosage and Administration Information

How to Use Ichthyol

The usage of Ichthyol (Ichthammol) follows specific instructions detailing its route, frequency, and administration steps, primarily for its established topical forms. The preparation is designated for topical application, commonly available as 10% or 20% ointment or salve.

Official Administration Guidelines

Instruction Detail
Route of Administration Topical (application to the skin). Oral use is reserved for specific homeopathic pellet forms.
Dosing Frequency Apply the ointment once or twice a day. The duration of use is generally guided by the period necessary for symptomatic relief.
Standard Application The regimen involves applying a coating sufficient to cover the affected area. Specific weight-based dosages are not stipulated for this dermatological preparation.
Age-Group Rules The homeopathic regimen for children is the same as for adults (e.g., 3 to 5 pellets three times a day).

Resulting Procedural Structure

The protocol for topical use involves several steps to ensure proper administration. The initial step requires the affected area to be cleansed before applying the product. Following this, a coating of the ointment is to be applied to the site, typically on a gauze bandage or appropriate dressing. Standard usage instructions specify that the product is for external use only and must not be rubbed or massaged into the skin, defining the physical boundary and constraints for its use. The application may be repeated according to the prescribed frequency until the usage period concludes.

Recent Clinical Evidence

This overview provides a neutral summary of the clinical research conducted on Ichthyol (Ichthammol). It focuses on the types of studies available, the specific measures examined by researchers, and the known limitations in the evidence base.


Evidence for Use in Eczema and Dermatitis

Research exploring Ichthyol in contexts such as various forms of eczematous dermatitis includes Systematic Reviews and analysis of Expert Guidelines. Studies monitored outcomes linked to inflammatory states, such as measures of redness and patient-reported outcomes describing perceived discomfort (pruritus). Expert guidelines describe a place for Ichthyol in the topical care of chronic eczema symptoms. However, the certainty surrounding these findings remains low to moderate. The evidence landscape is characterized by a limited number of modern, comparative Randomized Controlled Trials (RCTs), and comparative evidence is lacking against many contemporary topical alternatives.


Evidence for Traditional Uses and Other Conditions

Research examining Ichthyol’s application for traditional uses like boils (furuncles) and minor superficial abscesses is primarily rooted in historical dermatological practice and observational experience. Studies monitored outcomes related to the drainage or the localized swelling over defined, short time intervals. This evidence is generally considered limited due to a lack of modern, controlled trials. Additionally, research has explored Ichthyol for conditions like Psoriasis in small-scale RCTs, but findings were often mixed or reported non-significant changes in disease severity measures. The evidence level for these uses is typically classified as Low.


Research Gaps and Limitations

The available research has limitations in two primary areas: duration and population. Data on the durability of any observed effects or long-term outcomes are generally not fully established, as follow-up durations were limited in interventional studies. Furthermore, data remain insufficient for certain patient groups, including most pediatric patients and individuals with significant comorbidities. The reliance on traditional use rather than a comprehensive set of high-quality RCTs means the overall certainty remains low across many indications.

Key Studies & References

  1. Efficacy of Topical Ichthammol in Treatment of Mild Plaque Psoriasis (Split-Test RCT)
  2. CVS Ichthammol Ointment Drawing Salve - DailyMed (Human OTC Drug Label)
  3. Boils and carbuncles: Learn More – How are boils treated? (Observational/Traditional Use Context)
  4. Eczema Treatment Work Programme (Systematic Review Context on RCT Landscape)

Frequently Asked Questions (FAQ)

Common questions about Ichthyol (FAQ)


Q: Why is Ichthyol sometimes called Black Salve or drawing ointment?

Some official product information in the US market classifies certain Ichthammol ointments as a “Drawing Salve.” The characteristic dark, bituminous color has led to the common description “Black Salve.” Regulatory bodies and manufacturers generally avoid this common name to prevent confusion with different, potentially corrosive products.


Q: Is Ichthyol the same as Ictasol or pale sulfonated shale oil?

The active ingredient in Ichthyol is Ichthammol (Ammonium bituminosulfonate). While all are derived from sulfonated shale oil, regulatory data notes the existence of different versions. Regulatory data notes the existence of different versions, with dark Ichthyol being traditionally used for deeper penetration while Pale Ichthyol is for more superficial use.


Q: Does Ichthyol have an unpleasant smell, and why?

Yes, Ichthammol is known to have a strong, tarry, or sulfur-like odor. This characteristic scent is due to its composition, as the substance is naturally derived from sulfur-rich oil shale during its manufacturing process.


Q: How quickly does Ichthyol usually start to work?

Official product labels generally state that the preparation should be applied until symptomatic relief is achieved. Clinical studies examined in regulatory overviews have reported signs of improvement with consistent use within a couple of weeks in certain populations.


Q: Is Ichthyol known to cause staining on clothes or skin?

Yes, the official patient safety information and adverse reaction reports indicate that Ichthammol preparations may cause stains on clothing, skin, and hair. This is a known issue due to the dark, oily, and bituminous nature of the ointment.


Q: Why is Ichthyol sometimes mentioned in older medical texts?

The use of Ichthyol has a long history in dermatological practice, dating back over 100 years to the late 19th century. Regulatory overviews reference its inclusion in historical dermatological practice, where it was studied by prominent dermatologists for various skin conditions.


Q: What happens if Ichthyol is accidentally ingested?

Ichthyol preparations are for external use only. Official safety information indicates that if the product is swallowed, one should contact a poison control center. Material Safety Data Sheets for the pure product indicate that accidental ingestion may cause nausea, vomiting, or irritate the respiratory system.


Q: Is it normal for the skin to look discolored after applying Ichthyol?

Yes, it can be normal. Given that Ichthyol is a dark, bituminous substance with known staining properties, official adverse reaction reports commonly mention temporary changes to skin color or discoloration following topical application.


Q: Is Ichthyol safe to use on children or infants?

The safety of the topical Ichthyol preparation for infants is an area with limited data. While some regulated formulations confirm eligibility for children, certain regulatory policies advise that Ichthammol is considered unlicensed for use in children in some jurisdictions. Regulatory information emphasizes the importance of referring to the specific product label or consulting a healthcare provider.


Q: Are there any specific warning signs or serious side effects to watch out for with Ichthyol?

Official labeling advises to stop use and ask a doctor if redness, irritation, swelling, or pain persists or worsens. While systemic serious adverse reactions are not commonly defined, the pure active ingredient is classified as a significant eye irritant if direct contact occurs.


Q: Can Ichthyol be used at the same time as other topical skin treatments?

There are no mandatory timing separation requirements documented in official regulatory labels for co-administered medicinal products. Patient information from expert sources sometimes describes a place for Ichthammol in a topical care routine, which may involve applying it after another prescribed product.


Q: Is Ichthyol suitable for sensitive skin areas?

Official patient information explicitly warns users to avoid applying the preparation to the eyes. Furthermore, many preparations contain excipients like lanolin (wool fat), and individuals should be aware of known allergies to components in the formulation.


Q: Can Ichthyol be used on broken skin or open wounds?

Patient safety information and official labels state that one should ask a doctor before use if the affected area includes deep puncture wounds or serious burns. Patient information often advises against using the product on severe infections or deep cuts without professional guidance.


Q: How is the potency of Ichthyol measured or standardized?

The quality and consistency of the product are assessed according to pharmaceutical standards, such as those detailed in the European Pharmacopoeia (Ph. Eur.) and the US Pharmacopeia (USP). These standards define the required molecular composition and percentage of the active sulfonated compounds within the preparation.


Q: Is Ichthyol considered a primary treatment or a supportive treatment for skin conditions?

Expert guidelines and patient leaflets describe Ichthammol's role as providing symptomatic relief for inflammation and a place for it in the topical care of chronic conditions. It is frequently noted for its use in supporting other prescribed treatments to help reduce discomfort and itching.


Q: Do different application forms (ointment, cream, solution) of Ichthyol work differently?

Regulatory guidance differentiates formulations based on their composition. For instance, pale Ichthyol is considered more suitable for superficial uses, while dark Ichthyol is sometimes associated with a deeper penetration profile, suggesting functional differences related to the chemical makeup and base of the preparation.


Q: Can Ichthyol be used on the scalp or hair area?

Research and regulatory overviews have evaluated Ichthammol, including its use in shampoo formulations for conditions affecting the scalp, such as scalp psoriasis. The suitability depends on the specific product formulation.

How should Ichthyol be stored and disposed of?

How to Store and Dispose of Ichthyol?

Storing Ichthyol (Ichthammol) correctly is essential for maintaining its stability, as defined by official labeling requirements.

Official Storage Requirements

Condition Requirement
Temperature Store at room temperature and in a cool place, away from heat sources. Do not store above 30°C (86°F).
Environment Keep the container tightly closed and dry. Store away from direct sunlight.
Protection Always store the product in its original container and keep it out of the sight and reach of children.

Disposal Instructions

Unused or expired Ichthyol must be disposed of according to local, regional, and national regulations. To protect the environment, the product should not be discharged into drains or water courses, as it is classified in regulatory data as potentially harmful to aquatic life.

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

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