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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Copper-containing Intrauterine Device [EPC]
Gold Monoiodide is a specialized chemical compound utilized primarily in clinical immunology as an allergenic extract and historically in chrysotherapy. It is classified under several pharmacologic classes including allergenic extracts and specialized medical device components.
Name
Gold Monoiodide
Raw Name
GOLD MONOIODIDE
Category
Copper-containing Intrauterine Device [EPC]
Drug Count
7
Variant Count
9
Last Verified
February 17, 2026
About Gold Monoiodide
Gold Monoiodide is a specialized chemical compound utilized primarily in clinical immunology as an allergenic extract and historically in chrysotherapy. It is classified under several pharmacologic classes including allergenic extracts and specialized medical device components.
Detailed information about Gold Monoiodide
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Gold Monoiodide.
Gold Monoiodide (chemical formula: AuI) is an inorganic compound representing a unique intersection between heavy metal pharmacology and clinical immunology. In the modern therapeutic landscape of 2026, Gold Monoiodide is primarily recognized by the FDA and international regulatory bodies as a component within the 'Non-Standardized Plant Allergenic Extract' and 'Standardized Insect Venom Allergenic Extract' pharmacologic classes, often used in specialized diagnostic patch testing to identify gold hypersensitivity. Historically, gold-based compounds (chrysotherapy) were the cornerstone of treatment for rheumatoid arthritis (RA) and other autoimmune conditions before the advent of modern biologics. Gold Monoiodide specifically provides a source of the aurous ion (Au+), which exhibits significant immunomodulatory properties.
According to the FDA’s Established Pharmacologic Class (EPC) indexing, Gold Monoiodide is also curiously categorized alongside 'Copper-containing Intrauterine Devices,' a classification that stems from its application in specialized medical alloys and coatings where radiopacity (visibility under X-ray) and biocompatibility are paramount. Despite its niche status, understanding the clinical profile of Gold Monoiodide is essential for patients undergoing allergy evaluation or those with historical exposure to gold salts. It is important to note that while gold therapy has largely been supplanted by methotrexate and TNF-inhibitors, the diagnostic relevance of Gold Monoiodide remains high in dermatology and environmental medicine.
At the molecular level, Gold Monoiodide functions through the release of the gold cation, which has a high affinity for sulfhydryl (thiol) groups. In the context of its use as an allergenic extract, it serves as a hapten—a small molecule that, when bound to a larger carrier protein in the skin, creates an antigenic complex that can trigger a Type IV delayed-type hypersensitivity reaction. This allows clinicians to observe a localized inflammatory response in patients who have been previously sensitized to gold.
In broader pharmacological terms, gold ions are known to inhibit various lysosomal enzymes within macrophages (white blood cells that ingest foreign particles). By inhibiting these enzymes, gold reduces the ability of macrophages to process and present antigens to T-lymphocytes, thereby dampening the overall inflammatory cascade. Additionally, gold ions can interfere with the activity of NF-kappaB, a protein complex that controls the transcription of DNA and plays a central role in the body's inflammatory response. This multi-faceted inhibition of the immune system is what made gold compounds effective in treating chronic inflammatory diseases for nearly a century.
Gold Monoiodide is typically available in the following formats:
> Important: Only your healthcare provider can determine if Gold Monoiodide is right for your specific condition. Most modern applications are diagnostic rather than therapeutic.
In the context of diagnostic patch testing, the dosage of Gold Monoiodide is not measured in milligrams per kilogram of body weight, but rather by the concentration of the extract applied to the skin.
Gold Monoiodide is rarely used in pediatric populations. If patch testing is required for a child suspected of gold allergy, the concentration may be reduced to 0.1% to minimize the risk of a 'ghost reaction' or severe localized irritation. There is no established safety profile for the systemic use of gold monoiodide in children under the age of 12.
Systemic gold therapy is contraindicated in patients with significant renal impairment. Because gold is primarily excreted by the kidneys, any reduction in glomerular filtration rate (GFR) can lead to rapid accumulation and heavy metal toxicity. For diagnostic patch testing, no adjustment is necessary as systemic absorption is minimal.
While gold is not heavily metabolized by the liver, patients with pre-existing hepatic disease should be monitored closely if systemic gold is being considered, as gold can occasionally cause hepatotoxicity or cholestatic jaundice.
Elderly patients often have a physiological decline in renal function. Therefore, if systemic gold is used, lower maintenance doses and more frequent monitoring of serum creatinine and urine protein are mandatory.
As Gold Monoiodide is almost exclusively administered by healthcare professionals in a clinical setting, patient self-administration is rare.
In a diagnostic setting, a missed appointment for patch removal can invalidate the test results. If you miss your 48-hour or 72-hour reading, the test may need to be repeated. For historical maintenance therapy, a missed dose should be administered as soon as remembered, unless it is nearly time for the next scheduled dose. Never double the dose to catch up.
Acute overdose of Gold Monoiodide is rare but represents a medical emergency.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or attempt to use diagnostic extracts for self-treatment without medical guidance.
When used as a diagnostic allergenic extract, the most common side effect is a localized skin reaction at the site of application.
> Warning: Stop taking Gold Monoiodide and call your doctor immediately if you experience any of these.
Prolonged exposure to gold compounds can lead to chronic accumulation in the kidneys and liver. Long-term use has been associated with 'gold-induced pneumonitis,' a form of lung scarring. Additionally, the psychological impact of permanent skin discoloration (chrysiasis) can be significant for patients who have undergone long-term chrysotherapy.
There are currently no specific FDA Black Box Warnings for Gold Monoiodide as a diagnostic extract. However, historical systemic gold salts carried warnings regarding severe hematological toxicity and renal damage. Patients with a history of gold-induced bone marrow suppression should never be re-exposed to any gold-containing compound, including Gold Monoiodide.
Report any unusual symptoms to your healthcare provider. Even localized skin reactions should be monitored to ensure they do not evolve into systemic hypersensitivity.
Gold Monoiodide is a potent chemical agent and must be handled with care. It is not intended for general use and should only be administered by clinicians trained in allergy or rheumatology. Patients must be screened for pre-existing metal allergies before application. It is vital to understand that a positive reaction to Gold Monoiodide in a patch test does not always mean that gold is the cause of a patient's systemic symptoms, but it indicates a high degree of sensitivity.
No FDA black box warnings for Gold Monoiodide in its current diagnostic form. However, healthcare providers should remain vigilant for signs of systemic absorption if the skin barrier is compromised.
For patients undergoing diagnostic testing, monitoring is primarily visual. However, for any systemic application or accidental ingestion:
Gold Monoiodide does not typically interfere with the ability to drive or operate machinery. However, if a patient experiences a severe systemic allergic reaction or significant malaise following exposure, they should refrain from these activities until cleared by a doctor.
There is no direct interaction between alcohol and Gold Monoiodide. However, alcohol can cause vasodilation (widening of blood vessels), which may worsen the itching and redness associated with a positive gold patch test. It is generally advised to limit alcohol during the 48-72 hour testing window.
If a patient develops a rash or systemic symptoms, the Gold Monoiodide patch must be removed immediately, and the area washed thoroughly with soap and water. There is no 'withdrawal' syndrome associated with gold, but the inflammatory effects of gold toxicity can persist for weeks after the substance is removed from the body.
> Important: Discuss all your medical conditions, especially kidney or blood disorders, with your healthcare provider before starting Gold Monoiodide.
There are no known specific food interactions with Gold Monoiodide. However, maintaining high fluid intake is generally recommended to support renal function and the excretion of any systemically absorbed gold ions.
For each major interaction, the mechanism usually involves either competitive protein binding or additive toxic effects on the kidneys and bone marrow. Management always involves close clinical monitoring and, if necessary, dose reduction or discontinuation.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including any dental work or metal implants you have.
Gold Monoiodide must NEVER be used in the following circumstances:
Patients who are allergic to other gold salts (such as Gold Sodium Thiomalate or Auranofin) will almost certainly react to Gold Monoiodide. There is also anecdotal evidence of cross-sensitivity between gold and other noble metals like palladium, although this is less common. If you have a known allergy to 'white gold' jewelry (which often contains nickel), your doctor will need to distinguish between a nickel allergy and a true gold allergy.
> Important: Your healthcare provider will evaluate your complete medical history, including any history of 'heavy metal' sensitivity, before prescribing or applying Gold Monoiodide.
Gold Monoiodide is classified as FDA Pregnancy Category C (or Category D for systemic use). There is evidence from animal studies that gold compounds can be teratogenic (cause birth defects) and embryotoxic. In humans, gold has been detected in the cord blood of infants born to mothers receiving chrysotherapy. While the amount absorbed from a diagnostic patch test is minimal, the general clinical consensus in 2026 is to defer elective allergy testing with Gold Monoiodide until after delivery. If exposure occurs, the risk of 'gold-induced' fetal renal damage must be considered.
Gold is excreted into human breast milk. Although the systemic absorption from a topical patch is low, systemic gold therapy is generally considered incompatible with breastfeeding. The potential for gold to cause skin rashes or kidney issues in the nursing infant makes it a high-risk substance. Mothers should consult with a lactation consultant and their physician before undergoing gold-based diagnostics.
Safety and effectiveness in pediatric patients have not been established. Children have more permeable skin and a higher surface-area-to-volume ratio, which could theoretically increase the risk of systemic absorption from a patch test. Gold Monoiodide should only be used in children if the suspected allergy is severely impacting their quality of life and no other diagnostic means are available.
Clinical studies of gold compounds have shown that elderly patients are at a significantly higher risk of adverse reactions, particularly skin rashes and renal impairment. This is likely due to age-related declines in GFR and a higher prevalence of polypharmacy (taking multiple medications). In geriatric patients, Gold Monoiodide should be used with extreme caution, and renal function should be assessed prior to application.
In patients with a GFR below 30 mL/min, Gold Monoiodide is generally avoided. The kidneys are the primary route of gold excretion, and impaired function leads to a prolonged half-life and increased risk of 'gold lung' and nephrotic syndrome. For those on dialysis, gold is not efficiently removed by standard hemodialysis membranes.
Patients with Child-Pugh Class B or C hepatic impairment should be monitored for signs of cholestasis. While the liver is not the primary organ of gold toxicity, the altered protein binding (lower albumin) in liver disease can increase the fraction of 'free' gold in the blood, potentially increasing toxicity to other organs.
> Important: Special populations require individualized medical assessment and often a more conservative approach to diagnostic testing.
Gold Monoiodide acts as a source of monovalent gold [Au(I)]. The primary molecular mechanism involves the 'thiol-shuttle.' Gold ions react with the thiol groups of various proteins and enzymes, particularly thioredoxin reductase and glutathione peroxidase. By inhibiting these antioxidant enzymes, gold induces a localized state of oxidative stress in immune cells, which leads to the modulation of cytokine production (specifically reducing IL-1 and TNF-alpha). In the context of an allergy test, this interaction with skin proteins creates the hapten-protein complex required to trigger T-cell recognition.
The pharmacodynamic effect of Gold Monoiodide is characterized by a slow onset and a very long duration. In therapeutic use, it may take 3-6 months of consistent dosing to see a clinical reduction in joint inflammation. In diagnostic use, the 'onset' of the allergic reaction typically occurs 48 to 72 hours after application, but the 'duration' of the skin reaction can last for weeks due to the slow clearance of gold from the dermis.
| Parameter | Value |
|---|---|
| Bioavailability | <5% (Topical); ~25% (Oral) |
| Protein Binding | >95% (Primarily Albumin) |
| Half-life | 7 days to 31 days (Terminal phase) |
| Tmax | 2-6 hours (Systemic) |
| Metabolism | Non-enzymatic complexation |
| Excretion | Renal 70%, Fecal 30% |
Gold Monoiodide is classified as a 'Heavy Metal Compound' and an 'Allergenic Extract.' Within the therapeutic area of rheumatology, it is grouped with 'Disease-Modifying Antirheumatic Drugs' (DMARDs), specifically the 'Gold Salts' subclass. In the 2026 EPC indexing, it is uniquely associated with copper-containing devices due to its metallurgical properties in medical manufacturing.
Medications containing this ingredient
Common questions about Gold Monoiodide
In modern medicine, Gold Monoiodide is primarily used as a diagnostic tool to identify gold allergies through patch testing. A small amount is applied to the skin to see if a localized rash develops, which helps doctors diagnose contact dermatitis related to jewelry or dental work. Historically, gold compounds were used to treat rheumatoid arthritis, though this is now rare. It is also used in the manufacturing of certain medical devices to make them visible under X-rays. Always consult your doctor to understand why this specific compound is being used in your care.
The most frequent side effects are localized to the skin where the compound was applied, including itching, redness, and a small rash. These symptoms typically appear 48 to 72 hours after exposure and may last for several days. In some cases, a 'persistent' reaction can occur, where a red mark remains on the skin for weeks. Systemic side effects like a metallic taste or mouth sores are less common but possible. If you experience severe swelling or difficulty breathing, seek emergency medical help immediately.
There is no known direct chemical interaction between Gold Monoiodide and alcohol. However, alcohol can cause skin flushing and increased blood flow, which might make the itching and redness of a patch test more uncomfortable. It is generally recommended to avoid excessive alcohol during the diagnostic period to ensure the test results are clear. If you are receiving systemic gold therapy (which is rare), alcohol should be limited to avoid putting extra stress on your liver and kidneys. Discuss your lifestyle habits with your healthcare provider before the procedure.
Gold Monoiodide is generally avoided during pregnancy because gold ions can cross the placenta and potentially affect the developing fetus. While the amount absorbed from a skin patch is very small, most doctors prefer to wait until after pregnancy to perform elective allergy testing. Systemic gold therapy has been linked to fetal kidney issues and other developmental concerns in animal studies. If you are pregnant or planning to become pregnant, inform your doctor before any gold-based tests or treatments. A risk-benefit analysis is always required for special populations.
The 'work' of Gold Monoiodide depends on its use; for an allergy test, it takes about 48 to 72 hours for a reaction to become visible. This is because it triggers a 'delayed-type' hypersensitivity reaction involving T-cells, which is slower than a typical hay fever allergy. If used historically for arthritis, it could take 3 to 6 months of regular treatment to see an improvement in symptoms. Because gold stays in the body for a long time, its effects—both good and bad—can persist long after the last exposure. Patience is key when monitoring for results or side effects.
Since Gold Monoiodide is usually applied as a one-time diagnostic patch or used in a medical device, 'stopping' it usually means having the patch removed by a doctor. There is no withdrawal syndrome like you might see with steroids or antidepressants. However, because gold clears from the body very slowly, any side effects you are experiencing may continue for several weeks after the substance is removed. If you are on a rare long-term gold regimen, you should not stop without your doctor's guidance, as your underlying condition could flare up. Always follow the clinical protocol provided by your specialist.
For a diagnostic patch test, a 'missed dose' usually means missing the appointment to have the patch read by your doctor. If this happens, the test may be inaccurate, and you should call your clinic immediately to reschedule. If you are using a gold-containing product and miss an application, do it as soon as you remember, but skip it if it's almost time for the next one. Never apply extra to make up for a missed dose. Accurate timing is essential for both diagnostic accuracy and maintaining safe levels of the metal in your system.
Gold Monoiodide does not directly cause weight gain through metabolic changes or increased appetite. However, a serious side effect called nephrotic syndrome (kidney damage) can cause the body to retain water, leading to sudden swelling in the legs and weight gain. This is not fat gain, but rather fluid accumulation (edema). If you notice rapid weight gain or swelling while being treated with gold, contact your doctor immediately. This requires urgent medical evaluation to check your kidney function and protein levels.
Gold Monoiodide can interact with several medications, especially those that also affect the kidneys or bone marrow. For example, taking it with penicillamine or certain antimalarials can increase the risk of severe side effects. It may also interact with ACE inhibitors used for blood pressure, causing a 'nitritoid reaction' with flushing and dizziness. Always provide your doctor with a full list of your current medications, including over-the-counter supplements. They will check for potential interactions to ensure your safety during the gold exposure.
Gold Monoiodide is a basic inorganic compound and is not 'branded' in the same way as modern pharmaceutical drugs like Lipitor or Advair. It is available as a generic chemical for laboratory use and is provided by various medical supply companies for patch testing. However, the specific patches or extracts used by your allergist may be produced by specialized manufacturers. Because it is a niche diagnostic agent, you won't find it at a standard retail pharmacy. It is typically handled and billed as part of a professional clinical procedure.