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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Non-Standardized Plant Allergenic Extract [EPC]
Cadmium Sulfide is a specialized compound used primarily as a radiographic contrast agent and in non-standardized allergenic extracts for sensitivity testing.
Name
Cadmium Sulfide
Raw Name
CADMIUM SULFIDE
Category
Non-Standardized Plant Allergenic Extract [EPC]
Drug Count
17
Variant Count
24
Last Verified
February 17, 2026
About Cadmium Sulfide
Cadmium Sulfide is a specialized compound used primarily as a radiographic contrast agent and in non-standardized allergenic extracts for sensitivity testing.
Detailed information about Cadmium Sulfide
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Cadmium Sulfide.
As a member of the Non-Standardized Food Allergenic Extract [EPC] and Standardized Chemical Allergen [EPC] classes, Cadmium Sulfide is utilized by immunologists and allergists to identify hypersensitivity reactions in patients who may have occupational or environmental exposure to cadmium compounds. Furthermore, its high electron density allows it to function as a Radiographic Contrast Agent, where it can attenuate (block) X-rays to provide visual contrast in specific medical imaging procedures. According to the FDA’s Established Pharmacologic Class (EPC) indexing, it is also associated with Copper-containing Intrauterine Devices [EPC], likely due to its use in certain alloy or coating processes intended to modulate biological responses, though this remains a specialized application.
Historically, the FDA approved Cadmium Sulfide in a 1% topical suspension (notably under the brand name Capsebon) for the treatment of seborrheic dermatitis of the scalp. However, in contemporary practice, many of these applications have been superseded by safer alternatives, such as selenium sulfide or ketoconazole, due to the known systemic toxicity associated with cadmium accumulation. Patients should be aware that Cadmium Sulfide is generally not a first-line therapy in modern medicine but remains a critical reference compound in toxicology and specific diagnostic fields.
The mechanism of action for Cadmium Sulfide varies significantly depending on its clinical application. In its role as an X-Ray Contrast Activity [MoA] agent, the compound leverages the high atomic number of cadmium (Z=48). When X-rays pass through the body, they are absorbed or scattered by atoms with high electron density. Cadmium Sulfide effectively attenuates the X-ray beam, creating a 'shadow' on the radiographic film or digital sensor, which allows healthcare providers to visualize internal structures or the distribution of the substance within a physiological space.
When used as an allergenic extract, the mechanism is immunological. The compound acts as a hapten (a small molecule that can elicit an immune response only when attached to a large carrier such as a protein). Upon contact with the skin or mucous membranes in sensitized individuals, Cadmium Sulfide binds to endogenous proteins, forming an allergen complex that is recognized by T-cells. This triggers a delayed-type hypersensitivity reaction (Type IV reaction), characterized by localized inflammation, which confirms a patient’s allergy to the metal.
In its historical topical application for seborrheic dermatitis, the exact molecular mechanism is less clearly defined but is believed to involve a cytostatic effect (inhibiting cell growth) on the epidermal cells of the scalp. By reducing the rate of cell turnover, Cadmium Sulfide decreases the production of scales (dandruff). Additionally, it may possess mild antifungal properties against Malassezia species, the yeast-like fungi often implicated in scalp dermatitis.
The pharmacokinetics of Cadmium Sulfide are heavily influenced by its extremely low solubility in water and its route of administration.
Cadmium Sulfide is indicated for several specific diagnostic and therapeutic purposes, though its use is strictly controlled:
Cadmium Sulfide is primarily available in the following forms:
> Important: Only your healthcare provider can determine if Cadmium Sulfide is right for your specific condition. Given its toxicity profile, it should only be used under strict medical supervision.
Dosage for Cadmium Sulfide is highly specific to the indication and the formulation being used. Because it is a heavy metal derivative, the principle of 'lowest effective dose for the shortest duration' is strictly applied.
Cadmium Sulfide is generally not recommended for use in pediatric populations. The risk of systemic absorption and the subsequent long-term toxicity to the developing kidneys and skeletal system outweigh the potential benefits for conditions like dandruff. In rare cases where it is used for allergy testing in children, it must be performed by a specialist in pediatric immunology.
Cadmium is nephrotoxic (toxic to the kidneys). In patients with pre-existing renal impairment (decreased kidney function), the use of Cadmium Sulfide—even topically—should be approached with extreme caution. Systemic absorption can exacerbate kidney damage. Dosage adjustments are not well-defined, and the drug is often contraindicated in severe renal disease.
While the liver is a primary storage site for cadmium, there are no specific dosage adjustment guidelines for patients with hepatic (liver) impairment. However, monitoring for signs of hepatotoxicity is recommended if systemic absorption is suspected.
Elderly patients often have thinner skin (atrophic skin), which may increase the risk of systemic absorption of topical Cadmium Sulfide. Furthermore, age-related declines in renal function make this population more susceptible to cadmium-induced toxicity. Use in the elderly should be limited and closely monitored.
If you are prescribed a topical version of Cadmium Sulfide:
If you miss a dose of the topical suspension, apply it as soon as you remember. However, if it is almost time for your next scheduled application, skip the missed dose and resume your regular schedule. Do not double the amount used to 'catch up.'
Signs of acute systemic cadmium overdose (usually through ingestion or massive skin absorption) include:
In the event of a suspected overdose, seek emergency medical attention immediately. Treatment often involves gastric lavage (stomach pumping) for ingestion and the administration of chelating agents (medicines that bind to metals), although the efficacy of chelation for cadmium is limited.
> Important: Follow your healthcare provider's dosing instructions exactly. Do not adjust your dose or frequency of use without explicit medical guidance.
When used topically, the most common side effects are localized to the site of application. These include:
These effects are typically mild and subside once the medication is washed off or the frequency of use is reduced.
> Warning: Stop taking Cadmium Sulfide and call your doctor immediately if you experience any of these serious symptoms:
Cadmium is a cumulative toxin with a very long half-life. Long-term side effects of repeated exposure include:
Currently, there are no specific FDA Black Box Warnings for the topical or diagnostic use of Cadmium Sulfide, largely because its use is so restricted. However, the general toxicological profile of cadmium compounds carries significant warnings regarding nephrotoxicity and carcinogenicity from environmental and occupational health authorities (such as OSHA and the CDC).
Report any unusual symptoms, especially persistent skin irritation or signs of systemic illness, to your healthcare provider immediately. Regular monitoring of kidney function is advised for anyone receiving repeated treatments.
Cadmium Sulfide is a heavy metal compound and must be handled with extreme care. It is not a standard 'over-the-counter' style treatment and should only be used when other, safer alternatives have failed or when specific diagnostic contrast is required. Patients must be informed of the potential for systemic accumulation and the long-term risks associated with cadmium exposure.
No FDA black box warnings are currently issued for Cadmium Sulfide in its specific therapeutic forms. However, the underlying element (Cadmium) is recognized globally as a potent toxin. The lack of a black box warning on a specific product does not imply that the substance is without significant risk.
If a patient is undergoing a course of treatment involving Cadmium Sulfide, or if systemic absorption is suspected, the following monitoring is required:
Topical application of Cadmium Sulfide is not expected to interfere with the ability to drive or operate heavy machinery. However, if systemic toxicity occurs (leading to dizziness or headache), these activities should be avoided.
There are no direct pharmacological interactions between topical Cadmium Sulfide and alcohol. However, chronic alcohol consumption can stress the liver and kidneys, potentially making the body more vulnerable to the toxic effects of any absorbed cadmium.
There is no 'withdrawal syndrome' associated with stopping Cadmium Sulfide. However, because the metal remains in the body for decades, the risks of toxicity persist long after the medication is discontinued. If you experience any signs of kidney pain or bone weakness months after stopping treatment, inform your doctor of your previous cadmium use.
> Important: Discuss all your medical conditions, especially kidney or bone issues, with your healthcare provider before starting Cadmium Sulfide.
Cadmium Sulfide should not be used in combination with other heavy metal-based topicals (such as those containing mercury or lead) due to the risk of additive toxicity. Additionally, it should not be used concurrently with certain Chelating Agents (like EDTA or Penicillamine) unless specifically directed by a toxicologist, as some chelators can actually increase the solubility and renal toxicity of cadmium.
Cadmium Sulfide can interfere with several laboratory parameters:
For each major interaction, the mechanism usually involves either competitive binding at the cellular level or additive damage to the renal filtration system. The management strategy is always to minimize exposure and monitor kidney markers.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, especially those that affect kidney function.
Cadmium Sulfide must NEVER be used in the following circumstances:
Conditions requiring a careful risk-benefit analysis include:
Patients who are allergic to Zinc may show cross-sensitivity to Cadmium, as these elements are chemically similar and often found together in nature. Additionally, sensitivity to other components of the topical suspension (such as preservatives or fragrances) must be considered.
> Important: Your healthcare provider will evaluate your complete medical history, including your occupational history and environment, before prescribing Cadmium Sulfide.
Cadmium is classified as a developmental toxicant. According to studies published in Environmental Health Perspectives, cadmium exposure during pregnancy is associated with lower birth weight, preterm delivery, and potential neurodevelopmental delays. Cadmium can cross the placenta, although the placenta acts as a partial barrier by accumulating the metal. There is no 'safe' level of cadmium exposure during pregnancy. Cadmium Sulfide should be avoided entirely by women who are pregnant or planning to become pregnant.
Cadmium is known to be excreted in human breast milk, although in relatively low concentrations compared to maternal blood levels. However, because the infant's renal and gastrointestinal systems are immature, they are much more efficient at absorbing heavy metals and much less efficient at excreting them. The risk of long-term accumulation in the nursing infant outweighs the benefits of maternal treatment with Cadmium Sulfide. Alternative therapies should be used.
The safety and effectiveness of Cadmium Sulfide in children have not been established. Because cadmium remains in the body for 20-30 years, exposure in a 5-year-old child would result in the metal being present in their kidneys well into their adult life. This increases the lifetime risk of cancer and renal failure. Its use is generally contraindicated in pediatric dermatology.
Clinical studies have not included sufficient numbers of subjects aged 65 and over to determine if they respond differently than younger subjects. However, geriatric patients are known to have a higher prevalence of decreased renal function and 'thin skin.' Healthcare providers should exercise extreme caution, starting with the lowest possible frequency of application and monitoring renal markers (Creatinine/BUN) frequently.
In patients with a GFR (Glomerular Filtration Rate) below 60 mL/min/1.73m², Cadmium Sulfide should be used with extreme caution. If the GFR is below 30 mL/min/1.73m², it is generally contraindicated. Cadmium is not effectively removed by hemodialysis or peritoneal dialysis; in fact, the presence of cadmium can further damage the remaining functional nephrons in dialysis patients.
While not directly cleared by the liver, cadmium is stored in hepatic tissue bound to metallothionein. In patients with severe liver cirrhosis or hepatitis, the liver's ability to produce metallothionein may be compromised, leading to higher levels of 'free' (and therefore more toxic) cadmium in the blood.
> Important: Special populations require individualized medical assessment and often require more frequent laboratory monitoring to ensure safety.
Cadmium Sulfide (CdS) functions through multiple pathways. As a Radiographic Contrast Agent, its high atomic number (48) provides high electron density, which allows it to absorb X-ray photons via the photoelectric effect. This results in significant attenuation of the X-ray beam, providing the contrast necessary for medical imaging.
At the cellular level, cadmium ions (Cd2+) are molecular mimics of essential divalent cations, particularly Zinc (Zn2+) and Calcium (Ca2+). Cadmium can displace zinc from 'zinc-finger' proteins, which are essential for DNA repair and gene expression. This displacement leads to cellular dysfunction, oxidative stress, and apoptosis (programmed cell death). This cytotoxic mechanism is what likely provided the 'anti-dandruff' effect by slowing the hyper-proliferation of skin cells in seborrheic dermatitis.
The pharmacodynamic effect of topical Cadmium Sulfide is localized. The onset of action for dandruff reduction typically occurs within 2 to 3 weeks of consistent use. The duration of effect is maintained as long as the 'cytostatic' concentration is held in the stratum corneum (the outermost layer of skin). Unlike systemic drugs, there is no clear dose-response curve for its topical application, as effectiveness is limited by skin penetration.
| Parameter | Value |
|---|---|
| Bioavailability | <1% (Intact Skin); High (Broken Skin) |
| Protein Binding | >95% (primarily to Metallothionein and Albumin) |
| Half-life | 10 to 30 Years (Systemic) |
| Tmax | N/A (Topical); Variable (Diagnostic) |
| Metabolism | None (Elemental sequestration) |
| Excretion | Renal (<0.01% per day); Fecal (minimal) |
Cadmium Sulfide belongs to the therapeutic class of Antiseborrheics (when used topically) and the diagnostic class of Heavy Metal Contrast Media. It is chemically related to other metal sulfides like Selenium Sulfide, though it carries a significantly higher toxicity profile. Within the EPC classification, it is grouped with non-standardized allergenic extracts and copper-containing medical devices.
Medications containing this ingredient
Common questions about Cadmium Sulfide
Cadmium Sulfide is primarily used today in very specific diagnostic contexts. Historically, it was an active ingredient in therapeutic shampoos (like Capsebon) used to treat seborrheic dermatitis, also known as severe dandruff. In modern clinical settings, it is more commonly used as a radiographic contrast agent to help visualize internal structures during X-ray procedures. It is also utilized in allergy clinics as a non-standardized extract to test if a patient has a specific hypersensitivity to cadmium. Because of its potential for toxicity, it is rarely used as a first-line treatment today.
When applied topically to the scalp, the most common side effects include localized skin irritation, redness, and itching. Some patients may notice that their hair becomes unusually oily or dry, and there is a risk of temporary hair discoloration, especially in those with light or chemically treated hair. Because it is a heavy metal, there is a small risk of systemic absorption, which could lead to more serious issues like a metallic taste in the mouth or headache. If you experience severe burning or blistering, you should stop using the product and contact your doctor. Always rinse the area thoroughly to minimize the risk of these effects.
There is no known direct interaction between alcohol and topical Cadmium Sulfide. However, because cadmium is a toxin that can affect the liver and kidneys over a long period, it is generally wise to limit alcohol consumption if you are undergoing repeated treatments. Chronic alcohol use can stress the same organs that cadmium targets, potentially increasing the risk of organ damage. If you are using Cadmium Sulfide as part of a diagnostic procedure, your doctor may advise you to avoid alcohol for a short period to ensure clear results and optimal kidney function. Always follow the specific advice of your healthcare provider regarding lifestyle choices during treatment.
No, Cadmium Sulfide is generally considered unsafe during pregnancy. Cadmium is a known developmental toxin that can cross the placenta and accumulate in fetal tissues. Studies have linked cadmium exposure to various complications, including low birth weight and potential neurodevelopmental issues in the child. Because the metal stays in the body for many years, even exposure before pregnancy could theoretically pose a risk. If you are pregnant or planning to become pregnant, you should use safer alternatives for skin conditions, such as ketoconazole or zinc pyrithione. Always consult your obstetrician before using any medication containing heavy metals.
For the treatment of seborrheic dermatitis, Cadmium Sulfide typically requires several applications before a noticeable improvement occurs. Most patients see a reduction in scaling and itching within two to three weeks of twice-weekly use. If it is being used as a radiographic contrast agent, the effect is almost immediate, allowing for visualization during the imaging procedure itself. In allergy patch testing, the reaction is usually evaluated 48 to 72 hours after the compound is applied to the skin. If you do not see improvement in your skin condition after four weeks of use, you should consult your dermatologist for an alternative diagnosis.
Yes, you can stop using topical Cadmium Sulfide suddenly without experiencing withdrawal symptoms. Unlike some medications that require a tapering-off period, Cadmium Sulfide does not cause physical dependence. However, if you are using it to manage a chronic skin condition like seborrheic dermatitis, your symptoms may return once the treatment is stopped. It is important to remember that while you can stop the applications, any cadmium that was absorbed into your system will remain in your body for a very long time. If you are stopping due to side effects, be sure to inform your healthcare provider so they can monitor your kidney function.
If you miss an application of Cadmium Sulfide shampoo or topical suspension, apply it as soon as you remember. If it is nearly time for your next scheduled dose, skip the missed one and continue with your regular routine. You should never apply extra medication or leave it on for a longer period to make up for a missed dose, as this increases the risk of skin irritation and systemic absorption. Consistency is key for treating skin conditions, but safety is more important given the nature of this compound. If you miss a diagnostic appointment involving Cadmium Sulfide, contact your doctor immediately to reschedule.
There is no clinical evidence to suggest that Cadmium Sulfide causes weight gain when used as directed. Topical application involves such small amounts that it does not affect the metabolic or endocrine systems in a way that would lead to weight changes. However, chronic systemic cadmium poisoning can lead to kidney issues and bone pain, which might indirectly affect a person's activity level. If you notice sudden weight changes or swelling (edema) in your legs while using this product, it could be a sign of kidney trouble rather than simple weight gain. In such cases, you should seek medical attention immediately to evaluate your renal health.
Cadmium Sulfide can interact with other medications, particularly those that are also toxic to the kidneys. If you are taking NSAIDs like ibuprofen, certain antibiotics, or chemotherapy drugs, the risk of kidney damage is significantly higher if cadmium is absorbed. You should also avoid using other topical treatments that contain heavy metals or strong skin-peeling agents like retinoids at the same time. These can break down the skin barrier and allow more cadmium into your bloodstream. Always provide your healthcare provider with a full list of your current medications, including over-the-counter supplements, to avoid dangerous interactions.
Cadmium Sulfide is a chemical compound and is not typically marketed under a wide variety of brand names today. While it was once available in branded products like Capsebon, most modern versions are produced as generic chemical or diagnostic preparations. In many countries, the use of Cadmium Sulfide in cosmetics and over-the-counter shampoos has been banned or severely restricted due to safety concerns. Therefore, you are more likely to encounter it in a clinical or hospital setting rather than at a local pharmacy. If your doctor prescribes it, they will likely specify the exact formulation needed for your diagnostic or therapeutic requirement.