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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Brand Name
Cinnabaris
Generic Name
Cinnabaris
Active Ingredient
Mercuric SulfideCategory
Non-Standardized Food Allergenic Extract [EPC]
Variants
7
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 200 [hp_C]/1 | PELLET | ORAL | 37662-0326 |
| 1 [hp_M]/1 | PELLET | ORAL | 37662-0328 |
| 12 [hp_C]/1 | PELLET | ORAL | 37662-0323 |
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Cinnabaris, you must consult a qualified healthcare professional.
| 30 [hp_C]/1 | PELLET | ORAL | 37662-0324 |
| 100 [hp_C]/1 | PELLET | ORAL | 37662-0325 |
| 500 [hp_C]/1 | PELLET | ORAL | 37662-0327 |
| 6 [hp_C]/1 | PELLET | ORAL | 37662-0322 |
Detailed information about Cinnabaris
Mercuric Sulfide is a chemical compound primarily utilized as a standardized chemical allergen for diagnostic patch testing. It belongs to the class of Standardized Chemical Allergens and is used to identify hypersensitivity to mercury-containing substances.
In clinical diagnostic settings, the dosage of Mercuric Sulfide is standardized based on the surface area of the skin being tested. For the T.R.U.E. TEST system, the standard dose is 0.50 mg per square centimeter (mg/cm²) of Mercuric Sulfide. This is delivered via a specialized polyester patch that ensures consistent delivery of the allergen to the skin surface.
If a healthcare provider is using a manual patch testing method (Finn Chambers), they typically use a 1% concentration of Mercuric Sulfide in white petrolatum. A small amount (approximately 20 microliters) is applied to the chamber, which is then taped to the patient's back. The goal is not to achieve a systemic therapeutic effect but to elicit a localized skin reaction in sensitized individuals.
Mercuric Sulfide patch testing is generally not recommended for very young children unless a strong clinical suspicion of mercury allergy exists. For older children and adolescents (typically aged 6 and older), the dosage is the same as the adult dosage (0.50 mg/cm²). However, healthcare providers must exercise caution, as pediatric skin is thinner and may be more prone to irritant reactions or increased absorption. The decision to perform patch testing in children must be based on a careful risk-benefit analysis by a pediatric dermatologist or allergist.
No specific dose adjustments are required for patients with renal impairment when Mercuric Sulfide is used topically for patch testing, as systemic absorption is minimal. However, in patients with severe end-stage renal disease, clinicians should be aware that any absorbed mercury may be excreted more slowly.
Hepatic impairment does not affect the use of Mercuric Sulfide in patch testing, as the liver is not involved in the processing of topically applied mercuric salts.
Elderly patients may have thinner skin (atrophic skin), which can increase the risk of both irritant reactions and slightly higher absorption. Healthcare providers may choose to monitor the test site more closely in patients over the age of 65.
Mercuric Sulfide is not 'taken' in the traditional sense. It is applied by a healthcare professional during a diagnostic procedure. The process involves:
Since Mercuric Sulfide is administered as a single diagnostic application by a clinician, 'missed doses' do not occur in the same way as daily medications. However, if a patient misses their appointment for patch removal or reading, the diagnostic value of the test is significantly compromised. If a patch falls off prematurely, the patient should contact their doctor immediately and should not attempt to reattach it themselves unless specifically instructed.
An 'overdose' of Mercuric Sulfide during a patch test is extremely rare and would likely only occur if multiple patches were applied or if the substance was accidentally ingested.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or attempt to perform patch testing at home without medical guidance.
Because Mercuric Sulfide is used to intentionally provoke an immune response in sensitized individuals, 'side effects' at the site of application are expected in those with an allergy. Common reactions include:
Mercuric Sulfide is intended exclusively for diagnostic use by healthcare professionals. It must never be ingested, inhaled, or applied to large areas of the body. The primary safety concern with Mercuric Sulfide is its potential to cause both localized severe allergic reactions and, in extreme cases of misuse, systemic mercury poisoning. Patients must inform their doctor if they have a history of severe reactions to mercury (such as from dental work or broken thermometers) before undergoing testing.
No FDA black box warnings for Mercuric Sulfide. It is categorized as a diagnostic allergen rather than a therapeutic drug, which changes the regulatory framework for its labeling. However, it is subject to the general warnings regarding heavy metal exposure.
While Mercuric Sulfide is applied topically, certain substances can completely invalidate the test results or increase risks:
Mercuric Sulfide must NEVER be used in the following circumstances:
Conditions requiring careful risk-benefit analysis include:
Mercuric Sulfide is generally avoided during pregnancy. While the amount of mercury in a single diagnostic patch test (0.50 mg/cm²) is very small, mercury is a known potent neurotoxin. Elemental and methylmercury can cross the placental barrier and affect the developing fetal nervous system. According to the FDA's general principles for allergens, diagnostic testing should only be performed during pregnancy if the information is essential for the immediate management of the patient and cannot wait until after delivery. Most dermatologists categorize it as Category C (risk cannot be ruled out).
There is limited data on the passage of mercury into breast milk following a topical patch test. However, because the systemic absorption from a standardized patch is so low, it is unlikely to pose a significant risk to a nursing infant. Nevertheless, clinicians often recommend delaying elective diagnostic procedures to avoid any unnecessary exposure to heavy metals during the breastfeeding period.
Mercuric Sulfide is not approved for use in infants or very young children. In older children (ages 6-17), it is used to diagnose contact dermatitis, often related to dental materials or school-related chemical exposures. Clinical studies have shown that children can develop strong sensitivities to mercury. However, because pediatric skin is more permeable, the risk of an irritant reaction is higher. Providers must ensure the child can comply with the requirement to keep the patch dry for 48 hours.
Mercuric Sulfide acts as a diagnostic allergen by functioning as a hapten. At the molecular level, the mercuric ion (Hg2+) released from the sulfide compound interacts with the thiol (-SH) groups of cysteine residues in skin proteins. This covalent bonding creates a neoantigen. This antigen is recognized by the immune system's surveillance cells, specifically Langerhans cells, which utilize Major Histocompatibility Complex (MHC) Class II molecules to present the mercury-protein fragments to CD4+ T-helper cells. In a sensitized individual, this triggers a Type IV hypersensitivity reaction, characterized by the infiltration of T-cells and macrophages into the skin, leading to local inflammation.
The pharmacodynamics of Mercuric Sulfide are localized to the area of application. The dose-response relationship is such that a concentration of 1% (or 0.50 mg/cm²) is sufficient to trigger a reaction in most sensitized individuals without causing excessive irritation in non-sensitized people. The time to onset is typically 48 hours for the initial inflammatory response, but the peak effect (maximal redness and induration) often occurs at 72 to 96 hours. Tolerance does not develop because the substance is used for one-time diagnostic purposes.
Common questions about Cinnabaris
Mercuric Sulfide is primarily used as a diagnostic tool in the form of a skin patch test to identify mercury allergies. When a person has chronic skin rashes or other symptoms that suggest a sensitivity to mercury, a healthcare provider applies a small, controlled amount of Mercuric Sulfide to the skin. If the patient is allergic, a localized reaction like redness or itching will appear within two to four days. This helps doctors determine if the patient needs to avoid dental amalgams, certain industrial chemicals, or specific consumer products. It is an essential component of comprehensive allergy testing kits used by dermatologists worldwide.
The most common side effects are localized to the area where the patch was applied and include redness, itching, and small raised bumps. These symptoms are actually the 'intended' effect in an allergic person, as they indicate a positive test result. Some patients may also experience temporary skin darkening or a small blister at the site. These local reactions typically begin to fade within a few days after the patch is removed. If the itching is severe, your doctor may recommend a mild topical steroid after the final test reading has been completed.
While there is no direct chemical interaction between alcohol and Mercuric Sulfide, it is generally advised to avoid heavy alcohol consumption during the 4-day patch testing period. Alcohol can cause blood vessels in the skin to dilate, which might increase redness and itching at the test site. This can make it difficult for your doctor to distinguish between a true allergic reaction and general skin flushing. To ensure the most accurate diagnostic result, it is best to remain as healthy as possible and avoid substances that affect skin blood flow. Always follow the specific instructions provided by your allergy specialist.
Mercuric Sulfide patch testing is typically avoided during pregnancy as a precautionary measure. Mercury is a heavy metal that can cross the placenta and potentially affect the developing baby's nervous system. Although the amount used in a patch test is extremely small and very little is absorbed into the bloodstream, most diagnostic tests that are not urgent are postponed until after delivery. If you are pregnant or planning to become pregnant, you must inform your doctor before undergoing any allergy testing. They will help you weigh the necessity of the test against the potential risks.
As a diagnostic tool, Mercuric Sulfide works over a period of 48 to 96 hours. Because it triggers a 'delayed-type' hypersensitivity reaction, the results are not immediate. The patch must remain on the skin for the first 48 hours, during which time the immune system processes the allergen. Your doctor will usually perform a first reading when the patch is removed at 48 hours and a final, more definitive reading at 72 to 96 hours. Some reactions can even take up to a week to fully appear, so it is important to report any late-developing rashes to your physician.
Since Mercuric Sulfide is applied as a one-time diagnostic patch by a professional, there is no 'stopping' it in the way you would stop a daily pill. If you experience a severe reaction while the patch is on your skin, you should contact your doctor immediately. They may instruct you to remove the patch and wash the area. Once the patch is removed, the exposure to the allergen ends. There are no withdrawal symptoms or tapering requirements associated with this diagnostic procedure, but the site should be monitored until the skin returns to its normal appearance.
In the context of patch testing, a 'missed dose' usually means missing the appointment for the application or the scheduled reading of the results. If you miss the application, you simply need to reschedule. However, if you miss the appointment to have the results read at 48 or 96 hours, the test may be invalid and might need to be repeated at a later date. The timing of the readings is critical for an accurate diagnosis. If the patch falls off at home, do not try to tape it back on; instead, call your doctor's office for instructions.
There is no evidence to suggest that a diagnostic patch test of Mercuric Sulfide causes weight gain. The amount of the substance used is very small and is applied only to the surface of the skin for a short period. Weight gain is typically associated with systemic medications taken over a long period, such as oral steroids or certain antidepressants. If you notice sudden weight changes or swelling, it is likely due to another cause, and you should discuss it with your healthcare provider to determine the underlying reason.
Mercuric Sulfide can be used while taking most internal medications, but there are important exceptions. Systemic immunosuppressants like prednisone or certain chemotherapy drugs can 'hide' an allergy by preventing the skin from reacting, leading to a false-negative result. Similarly, you should not use steroid creams on the area of the back being tested. Most other medications for blood pressure, heart health, or diabetes do not interfere with the test. Always provide your doctor with a full list of your current medications before the patch test begins.
Mercuric Sulfide itself is a basic chemical compound and is not a branded drug in the traditional sense. However, it is sold as part of standardized diagnostic kits like the T.R.U.E. TEST, which is a proprietary product. There are other manufacturers that produce standardized mercury allergens for patch testing, which could be considered 'generic' versions of the allergen. These are only available to healthcare professionals and are not sold directly to consumers. Your insurance coverage will depend on the specific diagnostic procedure code used by your doctor rather than the brand of the allergen.
Other drugs with the same active ingredient (Mercuric Sulfide)
While Mercuric Sulfide patch tests are generally safe, serious reactions can occur.
> Warning: Stop taking Mercuric Sulfide (remove the patch if instructed by a professional) and call your doctor immediately if you experience any of these:
When used correctly as a one-time diagnostic tool, Mercuric Sulfide does not have long-term side effects. However, chronic exposure to Mercuric Sulfide (such as through occupational hazards or traditional medicines) can lead to:
No FDA black box warnings exist for Mercuric Sulfide when used as a standardized diagnostic allergen. However, the FDA maintains strict regulations on the concentration of mercury in all medical and cosmetic products due to its potential for cumulative toxicity.
Report any unusual symptoms to your healthcare provider. If you suspect you are having a severe allergic reaction, seek emergency medical care.
For a standard diagnostic test, no blood work is typically required. However, the healthcare provider must perform:
Mercuric Sulfide patch testing does not typically interfere with the ability to drive or operate machinery. However, if the patch is applied in a way that restricts movement or if the patient experiences significant discomfort or a rare systemic reaction, they should exercise caution.
There are no direct interactions between alcohol and the Mercuric Sulfide patch test. However, alcohol can cause vasodilation (widening of blood vessels), which might increase skin redness and itching, potentially making the test results harder to interpret. It is best to avoid heavy alcohol consumption during the 96-hour testing window.
If a patient experiences severe pain, burning, or signs of a systemic reaction, the patch should be removed immediately. There is no 'tapering' required as this is not a long-term medication. Once the patch is removed and the area is cleaned, the exposure ends.
> Important: Discuss all your medical conditions with your healthcare provider before starting Mercuric Sulfide testing, especially if you have a history of kidney disease or neurological disorders.
For each major interaction, the mechanism is typically pharmacodynamic (affecting how the body responds to the allergen) rather than pharmacokinetic (affecting how the drug is moved through the body). The management strategy is almost always the temporary discontinuation of the interacting substance prior to the diagnostic procedure.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, especially any creams or ointments used on your skin.
Patients who react to Mercuric Sulfide may also show cross-sensitivity to:
> Important: Your healthcare provider will evaluate your complete medical history, including any previous reactions to dental work or vaccines, before prescribing a Mercuric Sulfide patch test.
In patients over 65, the skin undergoes physiological changes, including thinning of the dermis and reduced vascularity. This can lead to:
In patients with chronic kidney disease (CKD), the body's ability to excrete heavy metals is diminished. While the dose in a patch test is sub-toxic, clinicians should exercise caution in patients with Stage 4 or 5 CKD. If multiple mercury-containing patches are used, monitoring for systemic levels might be considered in extreme cases, though this is not standard practice.
Hepatic impairment (liver disease) does not significantly alter the safety profile of topically applied Mercuric Sulfide, as the liver is not the primary organ for mercury clearance or the site of its diagnostic action.
> Important: Special populations require individualized medical assessment. Always inform your doctor if you are pregnant, planning to become pregnant, or have underlying organ dysfunction.
| Parameter | Value |
|---|---|
| Bioavailability | <1% (Topical/Intact Skin) |
| Protein Binding | >99% (to skin and plasma proteins) |
| Half-life | 30-60 days (Systemic Mercury) |
| Tmax | 48-72 hours (Local skin concentration) |
| Metabolism | Non-enzymatic; Redox reactions |
| Excretion | Renal (Urine) and Fecal |
Mercuric Sulfide is classified as a Standardized Chemical Allergen [EPC]. It is grouped with other diagnostic allergens such as Nickel Sulfate, Potassium Dichromate, and Cobalt Chloride. These agents are distinct from therapeutic drugs as their 'efficacy' is measured by their ability to accurately elicit a known allergic response for diagnostic purposes.