Ammonium Bituminosulfonate : Master of Cutaneous Inflammation, Itching, Dermatitis, Eczema & Psoriasis

Ammonium Bituminosulfonate

The dark, sulfonated shale oil with a 140-year history of dermatological use, a complex mixture of over 20 minerals and organic compounds that functions as a potent anti-inflammatory, antiseptic, and tissue-softening agent. Known colloquially as the "drawing salve," this remarkable substance operates through multiple mechanisms including lipoxygenase inhibition, skin barrier modulation, and immune cell regulation, making it an indispensable tool for treating boils, abscesses, eczema, psoriasis, and a wide range of inflammatory skin conditions. Its unique ability to loosen the stratum corneum and facilitate the drainage of pus while simultaneously reducing inflammation exemplifies the sophisticated therapeutic action that can emerge from complex natural mixtures.

1. Overview:

Ammonium bituminosulfonate, commonly known as Ichthammol or Ichthyol, is the ammonium salt of sulfonated shale oil, obtained through the dry distillation of bituminous schists followed by sulfonation and neutralization. Its primary actions are remarkably multifaceted. It inhibits key enzymes of polyenoic fatty acid metabolism, particularly 5-lipoxygenase in human polymorphonuclear neutrophils, leading to decreased release of pro-inflammatory leukotriene B4 . It reduces the number of ATPase-positive epidermal Langerhans cells, modulating cutaneous immune responses and inhibiting contact hypersensitivity . It exerts a concentration-dependent skin-loosening effect by interacting with structural proteins of the epidermis including filaggrin and laminin, which increases skin permeability and facilitates the extraction of pus from deep inflammations . It also exhibits antibacterial and antimycotic properties . It operates as a comprehensive topical therapeutic agent, simultaneously combating infection, reducing inflammation, and physically restructuring the skin to promote healing.

2. Origin & Common Forms:

Ammonium bituminosulfonate is not found in nature but is manufactured from specific mineral deposits. The original source was bituminous schists discovered near Seefeld in Tyrol, Austria. Similar deposits occur in Asia east of Lake Baikal, where the oil is known as stone oil, barakshin, or Asil, and in India where it is sold for remedial purposes as saladjidi .

· Dark Ichthyol (Ammonium Bituminosulfonate DAB): The traditional dark, viscous liquid with a characteristic bituminous odor. It is the most common form used in topical preparations for inflammatory skin diseases, abscesses, and furuncles .

· Pale Ichthyol (Leukichthol): A lighter, purified form with a different profile of activity, also used in dermatological preparations .

· Ointments (Ichtholan, various concentrations): The most common delivery form, available in concentrations ranging from 10% to 50% or higher. These are the classic "drawing salves" used for boils and abscesses .

· Creams: Lighter formulations, often at 1% concentration, used for conditions like eczema and dermatitis .

· Suppositories: Used rectally or vaginally for inflammatory conditions of the pelvic organs including prostatitis, endometritis, and hemorrhoids .

· Suspensions and Solutions: Used for topical application or as ingredients in more complex formulations .

3. Common Supplemental Forms:

Ammonium bituminosulfonate is a pharmaceutical active ingredient, not a dietary supplement. It is found exclusively in topical and rectal dosage forms.

· OTC Ointments and Salves: Widely available over-the-counter for first aid treatment of boils, splinters, and minor skin infections. Products like MG217 First Aid Drawing Salve contain 100 mg per gram of ointment .

· Prescription and Pharmacy-Only Preparations: In some countries, higher strength preparations or those for specific indications (e.g., scalp psoriasis shampoos, eczema creams) may be pharmacy-only or prescription items.

· Combination Products: Often formulated with other active ingredients including levomenthol, zinc oxide, salicylic acid, benzocaine, or carvasept for enhanced effects on specific conditions like anal fissures, internal hemorrhoids, and acne .

4. Natural Origin:

While the final product is manufactured, its origin is geological rather than botanical or animal.

· Source Material: The starting material is bituminous schists, a type of sedimentary rock containing organic matter. These mineral deposits were originally formed from the fossilized remains of marine organisms.

· Discovery: The therapeutic properties were discovered in the 19th century from deposits near Seefeld, Tyrol. The name "Ichthyol" derives from the Greek "ichthys" meaning fish, because fossilized fish remains were found in the shale deposits.

· Precursors: The shale oil contains saturated and unsaturated hydrocarbons, nitrogenous bases, acids, and several thiophene derivatives, as well as traces of some 20 minerals and "zoomelanoidic" acids . These complex organic compounds from ancient marine life form the basis of the final product.

5. Synthetic / Man-made:

The compound is manufactured through an industrial process, not through biosynthesis.

· Process: The manufacturing process was developed in the late 19th century .

1. Dry Distillation: The bituminous schists are subjected to dry distillation, yielding a crude oil.

2. Sulfonation: The distillate is treated with sulfuric acid to introduce sulfonate groups, creating sulfonated shale oil.

3. Neutralization: The sulfonated product is neutralized with ammonia, forming the ammonium salt, ammonium bituminosulfonate.

4. Purification and Standardization: The final product is purified and standardized to meet pharmacopoeial specifications, including minimum ammonia content (at least 2.5%) and sulfur content (at least 10%) .

6. Commercial Production:

· Precursors: Bituminous schists from specific geological deposits.

· Process: The process remains essentially that developed by Schröter in 1885 and Helmers in 1892 . It involves large-scale distillation, sulfonation, neutralization, and quality control. The Ichthyol Gesellschaft Cordes in Hamburg, Germany, has been a traditional manufacturer for over a century .

· Purity & Efficacy: Pharmaceutical grade material meets compendial standards (e.g., DAB, German Pharmacopoeia). Efficacy is well-established through over 140 years of clinical use and modern pharmacological studies. A 2022 study using 3D skin models confirmed the concentration-dependent skin-loosening effect that underlies its traditional use as a drawing salve .

7. Key Considerations:

The Drawing Salve Mechanism Validated by Modern Science. For generations, ammonium bituminosulfonate was known empirically as a "drawing salve" that could bring boils and abscesses to a head and promote drainage. Recent research using advanced 3D skin models has finally elucidated the mechanism behind this folk wisdom. The compound interacts with key structural proteins in the epidermis, particularly filaggrin and laminin, causing a controlled loosening of the skin layers. This increases skin permeability in a concentration-dependent manner, physically facilitating the extraction of pus and the treatment of deep-seated inflammation . This modern validation of a traditional effect exemplifies how complex natural mixtures can have sophisticated, multi-target mechanisms.

8. Structural Similarity:

Ammonium bituminosulfonate is not a single pure compound but a complex mixture. It is the ammonium salt of sulfonated shale oil. Its analysis shows the presence of saturated and unsaturated hydrocarbons, nitrogenous bases, organic acids, and several thiophene derivatives (sulfur-containing heterocyclic compounds) . The sulfonate groups (-SO3-) are key to its water solubility and biological activity. It contains at least 2.5% ammonia and 10% sulfur, along with traces of approximately 20 minerals . Its CAS registry number is 8029-68-3 .

9. Biofriendliness:

· Utilization: Applied topically, it penetrates the stratum corneum and exerts its effects locally within the epidermis and dermis. Its effects on skin structure are concentration-dependent .

· Metabolism and Excretion: As a complex mixture applied topically, it is not systemically absorbed in significant amounts when used as directed. Studies on systemic administration (oral) have been conducted for safety evaluation but do not reflect its intended use .

· Toxicity: Extensive toxicological studies have demonstrated that dark sulfonated shale oil is well-tolerated whether administered for a short period or over a long time. Studies on acute, subacute, and chronic toxicity, as well as local tolerance, and teratogenic, mutagenic, and carcinogenic potential, showed no indications for adverse effects. The therapeutic index for topical administration is greater than 7. These findings align with over 110 years of clinical experience that the drug is well-tolerated by humans .

10. Known Benefits (Clinically Supported):

· Treatment of Abscesses and Furuncles: The classic "drawing salve" effect. It promotes the maturation and drainage of boils and deep skin infections by loosening the epidermis and increasing permeability .

· Anti-inflammatory Action in Eczema and Psoriasis: Inhibits 5-lipoxygenase, reducing leukotriene B4 production, a key mediator of inflammation in these conditions . A shampoo containing Ichthyol has been evaluated for scalp psoriasis .

· Modulation of Cutaneous Immune Response: Reduces the number of ATPase-positive epidermal Langerhans cells, which may contribute to the inhibition of contact hypersensitivity and its effectiveness in inflammatory dermatoses .

· Antibacterial and Antimycotic Effects: Exhibits activity against bacteria and fungi, contributing to its usefulness in infected skin conditions .

· Treatment of Hemorrhoids and Anal Fissures: Used in suppository form, often in combination with other agents, for its anti-inflammatory and antiseptic properties .

· Gynecological and Urological Applications: Historically used in the former Soviet Union for inflammatory conditions of the female genital tract including endometritis, and for prostatitis, gonorrhea, and trichomoniasis, administered via urethral, vaginal, cervical, or rectal routes .

11. Purported Mechanisms:

· 5-Lipoxygenase Inhibition: Inhibits this key enzyme in the arachidonic acid cascade, reducing the production of pro-inflammatory leukotriene B4 from polymorphonuclear neutrophils .

· Lipoxygenase Inhibition (Broad): Also inhibits 15-lipoxygenases from various sources, and prostaglandin endoperoxide synthase, making it a universal inhibitor of lipoxygenase activities relevant to inflammatory dermatoses .

· Inhibition of ATPase on Langerhans Cells: Reduces the number of ATPase-positive epidermal Langerhans cells without affecting Ia-positive cells, suggesting a specific effect on this enzyme on the cell surface, which may regulate cutaneous contact hypersensitivity .

· Skin Loosening via Protein Interaction: Interacts with structural proteins of the epidermis, particularly filaggrin and laminin, in a concentration-dependent manner. This leads to increased skin permeability, facilitating pus extraction and treatment of deep inflammations .

· Keratin Expression Unaffected: Notably, treatment does not influence keratin expression, indicating a specific effect on certain structural proteins while leaving others intact .

12. Other Possible Benefits Under Research:

· Veterinary Medicine: Used as a demulcent, emollient, and antiseptic in veterinary practice .

· Scalp Psoriasis: Formulations including shampoos containing Ichthyol are being evaluated for their efficacy in treating scalp psoriasis .

· Atopic Dermatitis: Its use in dermatology for atopic eczema continues to be a topic of discussion and investigation .

13. Side Effects:

· Minor and Transient (Likely No Worry): Local skin irritation may occur in sensitive individuals. The characteristic bituminous odor can be off-putting to some.

· To Be Cautious About: The complex mixture contains polycyclic aromatic hydrocarbons, a group that includes known carcinogens. While comprehensive toxicological studies on the finished product have shown no evidence of carcinogenic, mutagenic, or teratogenic effects, and over a century of clinical use confirms its safety, concerns have been raised about potential risks from prolonged or extensive use, particularly in gynecological applications where long-term exposure could theoretically increase cancer risk . The weight of evidence supports its safety when used as directed, but it should not be used indiscriminately.

14. Dosing and How to Apply:

· For Boils and Abscesses (Drawing Salve): Apply a thick layer of 20% or higher ointment to the affected area, cover with a bandage, and leave on for several hours or overnight. The preparation may be reapplied as needed until the boil drains .

· For Eczema and Dermatitis: Creams or ointments at lower concentrations (1-10%) are applied to affected areas 1-2 times daily as directed .

· For Hemorrhoids and Anal Fissures: Suppositories are inserted rectally as directed, often at bedtime.

· For Scalp Psoriasis: Shampoos and other scalp preparations are used according to product instructions.

· Duration of Use: For acute conditions like boils, short-term use is typical. For chronic conditions like eczema, use as directed by a healthcare provider.

15. Tips to Optimize Benefits:

· Correct Concentration: Choose the appropriate concentration for the condition. Higher concentrations (20%+) are for drawing out infections; lower concentrations (1-10%) are for general anti-inflammatory effects in eczema and dermatitis.

· Clean the Area: Before application, clean the affected area gently with mild soap and water.

· Protective Bandaging: Covering the application site with a bandage can enhance penetration and protect clothing from staining.

· Warm Compresses: Applying a warm compress before using the drawing salve can help promote drainage.

· Combination Products: For specific conditions, combination products (e.g., with benzocaine for pain, with zinc oxide for skin protection) may offer enhanced benefits .

16. Not to Exceed / Warning / Interactions:

· Drug Interactions: No significant drug interactions are known for topical use.

· Medical Conditions:

· Open Wounds: While used for infected lesions and boils, application to large, open wounds should be under medical supervision.

· Pregnancy and Lactation: Safety has not been definitively established. Use only if clearly needed and under medical advice. The manufacturer of some products advises caution during pregnancy and lactation.

· Surgery: Due to its theoretical effects on inflammation and potential for systemic absorption, it is advisable to discuss its use with a surgeon before any scheduled procedure.

· Carcinogenicity Concerns: While comprehensive toxicological studies have not shown carcinogenic effects , some authors have raised concerns about potential risks from prolonged use, particularly in gynecological applications, due to the presence of polycyclic aromatic hydrocarbons . It should not be used for extended periods without medical supervision.

17. LD50 and Safety:

· Acute Toxicity (LD50): Not typically determined for a complex mixture intended for topical use. Systemic toxicity is not expected with topical application.

· Human Safety: Extensive toxicological studies in animals and over 140 years of human clinical experience confirm that ammonium bituminosulfonate is well-tolerated and safe when used as directed for its approved indications . No evidence of teratogenic, mutagenic, or carcinogenic effects has been found in standard preclinical studies .

18. Consumer Guidance:

· Label Literacy: Look for "Ichthammol," "Ammonium Bituminosulfonate," or "Ichthyol" on the label. The concentration should be clearly stated (e.g., 10%, 20%, 50%). The dosage form (ointment, cream, suppository) should be appropriate for the intended use.

· Quality Assurance: Choose products from reputable pharmaceutical manufacturers. In many countries, these are regulated as OTC drugs and must meet pharmacopoeial standards.

· Manage Expectations: Ammonium bituminosulfonate is a topical therapeutic agent, not a cosmetic or general wellness product. Its benefits are specific to inflammatory skin conditions and infections. It has a characteristic strong, tarry odor that some may find unpleasant. Its effects, particularly the "drawing" action on boils, can be dramatic and satisfying, representing one of the most tangible and venerable interventions in the dermatological pharmacopeia. The fact that modern science is only now beginning to understand the sophisticated mechanisms behind this 19th-century remedy is a testament to the depth of wisdom embedded in traditional pharmaceutical practice.