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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Brand Name
Acidum Oxalicum
Generic Name
Acidum Oxalicum
Active Ingredient
Oxalic AcidCategory
Standardized Chemical Allergen [EPC]
Variants
8
Different strengths and dosage forms
| Strength | Form | Route | NDC |
|---|---|---|---|
| 12 [hp_C]/1 | PELLET | ORAL | 37662-2516 |
| 30 [hp_C]/1 | PELLET | ORAL | 37662-2517 |
| 200 [hp_C]/1 | PELLET | ORAL | 37662-2519 |
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Acidum Oxalicum, you must consult a qualified healthcare professional.
| 100 [hp_C]/1 | PELLET | ORAL | 37662-2518 |
| 1 [hp_M]/1 | PELLET | ORAL | 37662-2521 |
| 1 [hp_Q]/1 | PELLET | ORAL | 37662-2522 |
| 500 [hp_C]/1 | PELLET | ORAL | 37662-2520 |
| 6 [hp_C]/1 | PELLET | ORAL | 37662-2515 |
Detailed information about Acidum Oxalicum
Oxalic Acid is a dicarboxylic acid primarily utilized in clinical settings as a standardized chemical allergen for diagnostic patch testing and as a laboratory reagent.
In the context of diagnostic testing, such as patch testing for chemical allergens, the dosage is not measured in milligrams of systemic intake but rather in concentration percentages. Healthcare providers typically use a standardized concentration (often 1% in petrolatum or aqueous solution) for topical application.
Oxalic Acid is generally not recommended for use in pediatric patients unless specifically required for diagnostic allergy testing under the supervision of a pediatric allergist. There is no established "safe" systemic dose for children, as the substance is considered a toxin when ingested. For diagnostic testing, clinicians may use lower concentrations or smaller application areas to minimize the risk of irritation.
Since Oxalic Acid is primarily excreted by the kidneys, individuals with pre-existing renal impairment are at a significantly higher risk of toxicity if systemic absorption occurs. While topical diagnostic use is generally safe, systemic exposure must be strictly avoided. In patients with chronic kidney disease (CKD), the clearance of metabolic oxalate is reduced, leading to a risk of oxalosis (deposition of calcium oxalate in tissues).
There are no specific dosage adjustments required for topical diagnostic use in patients with hepatic impairment, as the liver is not the primary organ of elimination for this compound.
Elderly patients may have thinner skin (atrophic skin), which can increase the risk of localized irritation or enhanced absorption during patch testing. Healthcare providers should monitor the test site closely for excessive reactions.
Oxalic Acid is NEVER to be taken orally or self-administered. It is used exclusively by healthcare professionals in a clinical setting.
Storage: Clinical preparations should be stored in a cool, dry place, away from direct sunlight, and kept in tightly sealed, corrosion-resistant containers.
In the context of diagnostic testing, a "missed dose" refers to a patch that has fallen off or a missed appointment for a test reading. If the patch is removed prematurely, the test may be invalidated, and the patient should contact their allergist to reschedule. Do not attempt to reapply the patch yourself.
Systemic overdose of Oxalic Acid is a medical emergency. It most commonly occurs through accidental ingestion or industrial exposure.
> Important: Follow your healthcare provider's dosing and application instructions. Do not adjust or attempt to use this substance without direct medical guidance.
When used as a diagnostic allergen, the most common side effects are localized to the site of application. These are generally expected as part of the test's mechanism.
Oxalic Acid is a potent chemical agent and must be handled with extreme caution. In a clinical setting, it is used in highly diluted forms, but the concentrated substance is corrosive. Patients undergoing testing must be informed that the substance is meant for topical diagnostic use only and must never be ingested or applied to broken skin.
No FDA black box warnings for Oxalic Acid. It is regulated primarily as a diagnostic reagent and allergen rather than a systemic therapeutic drug.
Oxalic Acid used as a diagnostic allergen has few systemic drug-drug contraindications, but certain combinations must be avoided to ensure test accuracy:
Oxalic Acid must NEVER be used in the following circumstances:
Oxalic Acid is generally classified as Category C (or equivalent) for pregnancy. This means that adequate and well-controlled studies in pregnant women are lacking. In diagnostic patch testing, the amount of Oxalic Acid used is very small and is applied topically, making significant fetal exposure unlikely. However, because the test induces an inflammatory immune response, many dermatologists recommend delaying elective patch testing until after pregnancy. If testing is deemed essential, it should be performed with the minimum necessary concentration and under close supervision.
It is unknown whether topically applied Oxalic Acid is absorbed in sufficient quantities to be excreted in human milk. Given the low concentrations used in diagnostic testing, the risk to a nursing infant is considered minimal. However, the patch should never be applied to the breast area to prevent direct contact between the infant and the allergen. Mothers should consult with their healthcare provider to weigh the diagnostic benefits against any potential risks.
Oxalic Acid is not frequently used in children. When it is required for the diagnosis of contact dermatitis in pediatric patients, it must be used with caution. Children's skin is thinner and more permeable than adult skin, which increases the risk of irritant reactions. The safety and efficacy of Oxalic Acid as a diagnostic tool in children under the age of 6 have not been extensively established. Pediatric testing should only be conducted by specialists in pediatric dermatology or allergy.
Oxalic Acid ($H_2C_2O_4$) functions as a Standardized Chemical Allergen by acting as a hapten. A hapten is a small molecule that, by itself, cannot elicit an immune response but can do so when bound to a larger carrier protein in the skin. Once this hapten-protein complex forms, it is processed by Langerhans cells (antigen-presenting cells in the skin) and presented to T-lymphocytes. In sensitized individuals, this triggers the release of pro-inflammatory cytokines, leading to the visible redness and swelling of a positive patch test.
On a biochemical level, its primary non-immunological action is Calcium Chelating Activity. The two carboxyl groups of the molecule are positioned such that they can bind to a single calcium ion, forming a very stable, insoluble ring structure known as calcium oxalate. This removes free calcium ions from the environment, which inhibits calcium-dependent enzymes and biological processes, such as the blood coagulation cascade.
The pharmacodynamic effect of Oxalic Acid in a patch test is delayed. The onset of the visible immune response typically occurs 24 to 48 hours after application, with the peak intensity often seen at 72 to 96 hours. The duration of the effect (the skin reaction) can last for several days to weeks depending on the individual's sensitivity. There is no evidence of tolerance development with diagnostic use; in fact, repeated exposure can lead to increased sensitivity (sensitization).
Common questions about Acidum Oxalicum
In clinical medicine, Oxalic Acid is primarily used as a standardized chemical allergen for diagnostic patch testing to identify contact allergies. It is also used as a laboratory reagent in various biochemical assays and as an anticoagulant in specific blood collection tubes due to its ability to bind calcium. It is not used as a medication to treat diseases but rather as a tool for diagnosis and research. Healthcare providers use it in highly controlled concentrations to ensure patient safety during these procedures. It is also a key metabolite studied in the context of kidney stone formation.
The most common side effects are localized to the area where the patch was applied and include redness, itching, and mild irritation. These symptoms usually appear 48 to 72 hours after the test begins and indicate the body's immune response to the substance. In some cases, small raised bumps or a temporary darkening of the skin may occur. Most local reactions fade within a few days after the patch is removed. If severe blistering or intense pain occurs, you should notify your doctor immediately.
While there is no direct chemical interaction between topical Oxalic Acid and alcohol, it is generally recommended to limit alcohol consumption during the 48-96 hour patch testing period. Alcohol can cause blood vessels in the skin to dilate, which might increase redness or itching at the test site and potentially make the results harder to interpret. It is best to maintain a stable lifestyle during the testing window to ensure the most accurate diagnostic outcome. Always follow the specific instructions provided by your allergist or dermatologist.
The safety of Oxalic Acid diagnostic testing during pregnancy has not been fully established, and it is generally classified as a Category C substance. Because the test is elective and involves inducing an inflammatory response, many healthcare providers recommend postponing it until after delivery. While the risk of systemic absorption from a small patch is very low, the theoretical risks to the developing fetus are usually avoided unless the test is medically urgent. If you are pregnant or planning to become pregnant, discuss the risks and benefits with your doctor before proceeding.
Oxalic Acid patch tests are designed to detect delayed-type hypersensitivity, which takes time to develop. A typical reaction is not visible immediately; instead, it usually begins to appear 24 to 48 hours after the patch is applied. Healthcare providers typically perform the first reading at 48 hours and a final reading at 72 or 96 hours. This timeline allows the T-cells in the immune system to recognize the allergen and create a localized inflammatory response. You must keep the area dry and undisturbed during this entire period for the test to be accurate.
You should never stop taking any prescribed medications without first consulting your healthcare provider. However, certain drugs like systemic steroids (prednisone) or topical immunosuppressants can interfere with the results of an Oxalic Acid patch test by suppressing the immune response. Your doctor will provide specific instructions on which medications need to be paused and for how long before the test. Generally, antihistamines do not need to be stopped for patch tests, but it is vital to provide your doctor with a complete list of everything you are taking.
If a diagnostic patch falls off before your scheduled appointment, do not try to reapply it yourself with tape or other adhesives. Contact your healthcare provider's office immediately to inform them, as the timing of the exposure is critical for an accurate reading. Depending on how long the patch was in place, your doctor may be able to proceed with the reading or may need to reschedule the test for a later date. Keep the area clean and avoid scratching the skin where the patch was located.
There is no evidence to suggest that Oxalic Acid, especially when used in small amounts for diagnostic testing, causes weight gain. It is not a hormone or a systemic metabolic medication that would influence body weight. Systemic Oxalic Acid is a toxin found in some foods, but even in that context, it is associated with kidney issues and mineral binding rather than weight changes. If you experience sudden weight changes, it is likely due to another factor and should be discussed with your healthcare provider.
Oxalic Acid is not a medication taken by patients; it is a chemical used by doctors for testing. However, the accuracy of the test can be affected by other medications you are using. Drugs that suppress the immune system, such as corticosteroids or biologics, can cause false-negative results. Additionally, medications that increase skin sensitivity might make an irritant reaction more likely. Always ensure your doctor knows about all your current prescriptions, over-the-counter drugs, and herbal supplements before the testing begins.
Oxalic Acid is a basic chemical compound and is not sold as a branded or generic consumer medication. In the medical field, it is available as a standardized reagent or as part of various allergenic extract kits produced by specialized pharmaceutical companies. These products are regulated by the FDA as biological or diagnostic products. You cannot purchase Oxalic Acid for medical use over the counter, and it should only be administered by trained medical professionals in a clinical environment.
Other drugs with the same active ingredient (Oxalic Acid)
While rare in the context of controlled diagnostic testing, the following symptoms require immediate intervention:
> Warning: Stop the diagnostic process and call your doctor immediately if you experience any signs of a systemic allergic reaction or severe skin pain.
No FDA black box warnings are currently issued for Oxalic Acid when used as a standardized chemical allergen in diagnostic testing. However, it is classified as a hazardous substance for handling and ingestion purposes.
Report any unusual symptoms, especially those occurring away from the test site, to your healthcare provider immediately.
For standard diagnostic patch testing, no systemic lab tests (like blood counts or liver function tests) are typically required. However, the following monitoring is essential:
In cases of suspected systemic exposure or toxicity, clinicians must monitor:
Standard diagnostic use of Oxalic Acid does not typically interfere with the ability to drive or operate machinery. However, if a patient experiences a strong localized reaction that causes significant discomfort or if they feel lightheaded following the procedure, they should avoid these activities until symptoms resolve.
There are no known direct interactions between topical Oxalic Acid and alcohol. However, alcohol can cause vasodilation (widening of blood vessels), which might exacerbate skin redness or itching at the test site. It is generally advisable to avoid excessive alcohol during the 48-96 hour testing window.
In diagnostic testing, "discontinuation" involves the removal of the patch. If a severe reaction occurs before the scheduled 48-hour mark, the patient should remove the patch and wash the area thoroughly with soap and water, then notify their physician.
> Important: Discuss all your medical conditions, especially any history of kidney stones or severe skin sensitivities, with your healthcare provider before starting Oxalic Acid testing.
Oxalic Acid can interfere with several laboratory parameters if present in the sample:
For each major interaction, the mechanism involves either the suppression of the immune system (pharmacodynamic) or the chemical binding of ions (chelation). The management strategy always involves informing the testing clinician of all current medications and supplements.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking before undergoing any diagnostic procedure involving Oxalic Acid.
Patients who are sensitive to Oxalic Acid may also show cross-reactivity to other dicarboxylic acids or certain plant extracts that contain high concentrations of natural oxalates. This includes certain species of Philodendron or Rhubarb. Healthcare providers should consider these relationships when interpreting test results.
> Important: Your healthcare provider will evaluate your complete medical history, including any history of kidney disease or skin disorders, before prescribing or using Oxalic Acid.
In elderly patients, several factors must be considered:
Patients with renal impairment (decreased GFR) are at a higher risk for complications related to oxalate. In healthy individuals, the kidneys efficiently excrete metabolic oxalates. In patients with renal failure, oxalate can accumulate and deposit in tissues (systemic oxalosis), including the heart, joints, and kidneys themselves. While the tiny amount used in a patch test is unlikely to cause systemic issues, these patients should be monitored closely, and the test should be avoided if they have a history of oxalate-related stones or nephrocalcinosis.
Hepatic impairment does not significantly alter the processing of Oxalic Acid, as it is not a primary site for its metabolism or excretion. No specific dosage adjustments for topical diagnostic use are required for patients with liver disease.
> Important: Special populations require individualized medical assessment to ensure that diagnostic procedures are both safe and effective.
| Parameter | Value |
|---|---|
| Bioavailability | <5% (Topical); ~10-15% (Oral, depends on Calcium) |
| Protein Binding | Minimal (as free acid); binds to tissue proteins as hapten |
| Half-life | 1.0 - 3.0 hours (Systemic) |
| Tmax | 1.0 - 2.0 hours (Post-ingestion) |
| Metabolism | Not metabolized; end-product of glyoxylate/ascorbate |
| Excretion | Renal >90%, Fecal <5% |
Oxalic Acid is classified as a Standardized Chemical Allergen [EPC]. Related substances in this diagnostic class include nickel sulfate, potassium dichromate, and formaldehyde. While it shares some chemical properties with other organic acids, its clinical use is distinct due to its specific allergenic and chelating profiles.