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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Non-Standardized Food Allergenic Extract [EPC]
Brown Rice (Oryza sativa) is utilized clinically as a Non-Standardized Food Allergenic Extract for the diagnosis and potential treatment of rice-related hypersensitivity reactions. It belongs to the class of non-standardized allergenic extracts used in clinical immunology.
Name
Brown Rice
Raw Name
BROWN RICE
Category
Non-Standardized Food Allergenic Extract [EPC]
Drug Count
7
Variant Count
7
Last Verified
February 17, 2026
About Brown Rice
Brown Rice (Oryza sativa) is utilized clinically as a Non-Standardized Food Allergenic Extract for the diagnosis and potential treatment of rice-related hypersensitivity reactions. It belongs to the class of non-standardized allergenic extracts used in clinical immunology.
Detailed information about Brown Rice
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Brown Rice.
Brown Rice, scientifically known as Oryza sativa, serves a dual role in the medical landscape. While primarily recognized as a staple nutritional grain, in a clinical and pharmacological context, it is classified as a Non-Standardized Food Allergenic Extract [EPC]. This classification refers to biological products derived from the whole grain of brown rice, containing the bran, germ, and endosperm, which house the specific proteins responsible for IgE-mediated allergic reactions.
As a non-standardized extract, Brown Rice does not have a universally defined potency unit (like the BAU/mL used for standardized extracts like grass pollen or dust mites). Instead, its concentration is typically expressed in terms of weight/volume (w/v) or protein nitrogen units (PNU). These extracts are regulated by the FDA's Center for Biologics Evaluation and Research (CBER) and are primarily used by board-certified allergists and immunologists for the diagnosis of food allergies through skin prick testing (SPT) or, in specific investigational settings, for oral or sublingual immunotherapy (OIT/SLIT).
Brown Rice belongs to a broad pharmacological family that includes other cereal grain extracts. Interestingly, the FDA's Established Pharmacologic Class (EPC) listings for this substance sometimes overlap with diverse categories such as Non-Standardized Plant Allergenic Extract [EPC] and Interferon gamma [EPC], reflecting the complex immunological pathways stimulated by rice-derived proteins. It is essential to distinguish between the dietary consumption of brown rice and the clinical use of its concentrated allergenic extract.
In a clinical diagnostic setting, Brown Rice allergenic extract works by eliciting a localized Type I hypersensitivity reaction. When a small amount of the extract is introduced into the epidermis via a skin prick, the specific proteins (allergens) in the rice bind to rice-specific Immunoglobulin E (IgE) antibodies that are attached to the surface of mast cells in the skin.
If the patient is sensitized, this binding causes the mast cells to degranulate, releasing inflammatory mediators such as histamine, leukotrienes, and prostaglandins. This results in the 'wheal and flare' reaction—a raised, itchy bump surrounded by redness—which confirms the presence of sensitization. At the molecular level, the primary allergens identified in brown rice include a 14-16 kDa protein (an alpha-amylase/trypsin inhibitor) and a 33 kDa protein (Gly m Bd 30K homolog), which are highly stable and resistant to heat and digestion.
The pharmacokinetics of allergenic extracts like Brown Rice differ significantly from traditional small-molecule drugs because they are biological proteins administered locally or via immunotherapy routes.
The primary FDA-recognized clinical use for Brown Rice extract is:
Off-label or investigational uses include:
Brown Rice allergenic extract is typically available in the following forms for clinical use:
> Important: Only your healthcare provider can determine if Brown Rice allergenic testing or immunotherapy is right for your specific condition. Diagnostic procedures must always be performed under medical supervision due to the risk of systemic reactions.
Dosage for Brown Rice allergenic extract is highly individualized and depends entirely on the clinical purpose (diagnosis vs. treatment) and the patient's sensitivity level.
For adults, the standard procedure involves applying one drop of the 1:10 or 1:20 w/v glycerinated extract to the skin (usually the forearm or back). A sterile lancet is then used to prick the skin through the drop. A positive control (histamine) and a negative control (saline/glycerin) are always used simultaneously to ensure the validity of the test. The results are read after 15 to 20 minutes.
If the SPT is negative but a strong clinical suspicion of allergy remains, a healthcare provider may perform intradermal testing. This involves injecting 0.02 mL to 0.05 mL of a highly diluted aqueous extract (e.g., 1:1000 w/v) into the dermis.
There is no standardized 'dose' for rice immunotherapy. Protocols typically involve a 'Build-up Phase' starting with microgram quantities of protein, increasing weekly or bi-weekly, followed by a 'Maintenance Phase' where a consistent high dose is administered to maintain desensitization.
Brown Rice extracts are used in children for diagnostic purposes. The procedure for skin prick testing in children is identical to that in adults, though the number of tests performed may be limited to minimize distress.
No specific dosage adjustments are required for renal impairment when used for diagnostic skin testing. However, patients with end-stage renal disease may have altered skin reactivity (uremic pruritus or skin thickening), which can interfere with test interpretation.
No dosage adjustments are necessary for hepatic impairment, as the systemic exposure during diagnostic testing is minimal.
In patients over 65, skin reactivity to allergens and histamine may be naturally reduced due to skin atrophy and decreased mast cell density. Healthcare providers may need to adjust the interpretation of the wheal size rather than the dose itself.
Brown Rice allergenic extract is NOT for self-administration unless specifically prescribed as part of a home-based immunotherapy maintenance program.
In the context of immunotherapy:
An 'overdose' in the context of allergenic extracts usually refers to the administration of a concentration higher than the patient's tolerance level, leading to a systemic allergic reaction.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or attempt home testing without medical guidance.
The most frequent side effects associated with Brown Rice allergenic extract occur at the site of administration. These are expected immunological responses and include:
While rare during diagnostic skin testing, systemic reactions can occur, especially during intradermal testing or immunotherapy.
> Warning: Stop using the extract and call your doctor immediately or seek emergency care if you experience any of the following:
For patients undergoing long-term immunotherapy with Brown Rice extract:
While non-standardized food extracts like Brown Rice may not always carry a specific individual black box warning on every label, they fall under the general FDA class warning for allergenic extracts:
Allergenic extracts can cause severe life-threatening systemic reactions, including anaphylaxis. Patients must be observed for at least 30 minutes following administration. Phenol-containing extracts should be used with caution in patients with known sensitivities. This product should only be administered by clinicians trained in the management of anaphylaxis.
Report any unusual symptoms or delayed reactions to your healthcare provider immediately. Even a 'mild' systemic reaction (like a few hives) can be a precursor to a more severe reaction in the future.
Brown Rice allergenic extract is a potent biological substance. It must only be used by healthcare professionals who are specifically trained in the diagnosis and treatment of allergic diseases. The primary safety concern is the unpredictable nature of allergic sensitivity; a patient who tolerated a test previously may react more strongly upon subsequent exposure.
As noted in the side effects section, the FDA requires a class-wide warning for all allergenic extracts regarding the risk of Anaphylaxis. This warning emphasizes that these products are not for home use (unless specifically prepared for maintenance immunotherapy) and require a 30-minute post-administration observation period in a clinical setting.
Generally, diagnostic testing does not affect the ability to drive. However, if a systemic reaction occurs and epinephrine or sedating antihistamines (like diphenhydramine) are administered, the patient should not drive or operate machinery for at least 24 hours.
Alcohol consumption should be avoided for 24 hours before and after testing or immunotherapy. Alcohol increases peripheral vasodilation, which can accelerate the absorption of the allergen and potentially trigger or worsen a systemic reaction.
If a patient experiences a severe systemic reaction, the use of the Brown Rice extract must be re-evaluated. Discontinuation may be necessary if the risk of anaphylaxis outweighs the diagnostic or therapeutic benefit.
> Important: Discuss all your medical conditions, especially respiratory or heart problems, with your healthcare provider before starting Brown Rice extract testing.
There are no absolute drug-drug contraindications that prevent the use of Brown Rice extract, but certain medications make its use unacceptably dangerous:
Brown Rice extract does not typically interfere with standard blood chemistry or hematology tests. However, it will directly affect:
Mechanism of Interactions: Most interactions are pharmacodynamic, where other drugs either suppress the target response (antihistamines) or interfere with the rescue medication (beta-blockers).
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, especially those for blood pressure, depression, or allergies.
Brown Rice allergenic extract must NEVER be used in the following circumstances:
These conditions require a careful risk-benefit analysis by an allergist:
Patients with a known allergy to Rice Pollen or other cereal grains (wheat, corn) may exhibit cross-reactivity. This is not a contraindication to testing but requires the clinician to use lower starting concentrations to avoid a systemic reaction.
> Important: Your healthcare provider will evaluate your complete medical history, including your heart and lung health, before prescribing or administering Brown Rice extract.
FDA Pregnancy Category C. There are no adequate and well-controlled studies of Brown Rice extract in pregnant women.
It is not known whether Brown Rice allergenic proteins are excreted in human milk. However, since these are large proteins and the amount used in testing is miniscule, the risk to a nursing infant is considered extremely low. The benefits of diagnostic clarity for the mother usually outweigh the theoretical risks to the infant.
Brown Rice extract is safe for use in children when administered by a pediatric allergist.
In patients over 65, the following factors must be considered:
There are no specific guidelines for renal impairment. However, clinicians should be aware that uremia (buildup of toxins in the blood) can inhibit the skin's response to histamine, potentially leading to uninterpreable test results.
No adjustments are necessary. The liver is not significantly involved in the clearance of the tiny amounts of protein used in diagnostic testing.
> Important: Special populations require individualized medical assessment and a cautious approach to any immunological challenge.
Brown Rice allergenic extract functions through the IgE-mediated hypersensitivity pathway. The extract contains specific proteins, notably the 14-16 kDa alpha-amylase inhibitor, which act as antigens. Upon contact with the skin (in testing) or mucous membranes (in immunotherapy), these antigens cross-link specific IgE antibodies bound to the high-affinity receptor (FcεRI) on mast cells and basophils. This cross-linking triggers a signaling cascade involving tyrosine kinases (like Syk), leading to the release of pre-formed mediators (histamine) and the synthesis of new mediators (leukotrienes).
In immunotherapy, the mechanism shifts toward Immune Tolerance. Repeated exposure to the extract induces the production of 'blocking antibodies' (IgG4), stimulates Regulatory T-cells (Tregs), and reduces the Th2-cell cytokine profile (IL-4, IL-5, IL-13), effectively 'retraining' the immune system to ignore the rice protein.
| Parameter | Value |
|---|---|
| Bioavailability | Negligible (Skin Prick); Variable (Sublingual) |
| Protein Binding | N/A (Directly interacts with IgE) |
| Half-life | Minutes (systemic proteins); Days (bound IgE) |
| Tmax | 15-20 minutes (Local reaction) |
| Metabolism | Proteolysis by tissue peptidases |
| Excretion | Renal (as amino acid metabolites) |
Brown Rice extract is classified as a Non-Standardized Food Allergenic Extract. It is part of a therapeutic class that includes other grain extracts (Wheat, Corn, Rye) and is distinct from 'Standardized Extracts' (like Ragweed or Honey Bee Venom) which have federally mandated potency requirements.
Common questions about Brown Rice
Brown Rice allergenic extract is primarily used by medical specialists to diagnose a rice allergy. Through a procedure called a skin prick test, a small amount of the extract is applied to the skin to see if it triggers an allergic reaction, such as a bump or redness. This helps doctors confirm if a patient's symptoms after eating rice are due to a true IgE-mediated allergy. In some specialized research settings, it may also be used for immunotherapy to help desensitize patients to rice. It is not used for general nutritional purposes in its extract form.
The most common side effects are localized to the area where the test was performed. Most patients experience a small, itchy bump called a wheal, which looks similar to a mosquito bite. Redness, warmth, and itching around the site are also very common and typically peak within 20 minutes. These symptoms usually fade completely within an hour or two. Rarely, some patients may experience a 'late-phase' reaction where swelling returns several hours later, but this is generally not dangerous.
No, it is strongly recommended that you avoid alcohol for at least 24 hours before and after receiving Brown Rice allergenic extract. Alcohol can cause your blood vessels to widen (vasodilation), which may speed up the absorption of the allergen into your bloodstream. This increases the risk of a systemic or severe allergic reaction. Additionally, alcohol can mask the early symptoms of a reaction or make it harder for doctors to treat you if an emergency occurs. Always follow your allergist's specific pre-test instructions.
Brown Rice extract is generally avoided during pregnancy unless the diagnostic need is urgent. While the extract itself does not cause birth defects, the risk of a systemic allergic reaction (anaphylaxis) poses a danger to the fetus by reducing oxygen flow. Most allergists will wait until after the baby is born to perform allergy testing. If you are already on a maintenance dose of immunotherapy, your doctor may choose to continue your current dose but will likely not increase it. Always inform your doctor if you are pregnant or planning to become pregnant.
In a diagnostic skin test, the Brown Rice extract works very quickly, with results appearing in 15 to 20 minutes. This rapid onset is because the test relies on pre-existing antibodies already present on your skin's mast cells. If you are using the extract for immunotherapy (desensitization), the process is much slower. It typically takes several months of weekly injections or daily oral doses to begin seeing a reduction in allergic sensitivity. Full clinical tolerance can take three to five years of consistent treatment.
If you are undergoing immunotherapy with Brown Rice extract, you should not stop treatment without consulting your allergist. Stopping suddenly will cause your level of desensitization to decline, and you may lose the protection you have built up against accidental rice exposure. If you miss doses and then try to restart at the same high dose, you are at a much higher risk for a severe allergic reaction. Your doctor will provide a schedule for tapering off or safely restarting if you have had an interruption in your treatment.
If you miss a dose of Brown Rice immunotherapy, contact your allergist's office immediately for guidance. Do not take an extra dose or increase your next dose to make up for the missed one, as this can be dangerous. Depending on how many days or weeks have passed, your doctor may need to lower your next dose to ensure your safety. Consistency is vital for the success of immunotherapy and for minimizing the risk of side effects. Always keep a log of your doses to help your healthcare provider manage your treatment.
There is no clinical evidence to suggest that Brown Rice allergenic extract causes weight gain. Unlike some medications like oral steroids, allergenic extracts do not affect your metabolism or appetite. The amount of protein and glycerin in the extract is nutritionally insignificant. If you notice weight changes while undergoing allergy treatment, it is likely due to other factors or medications you may be taking, such as corticosteroids for asthma. Discuss any concerns about weight with your healthcare provider.
Brown Rice extract can interact with several types of medications, particularly those used for blood pressure and allergies. Antihistamines must be stopped several days before testing because they block the very reaction the doctor is trying to measure. More importantly, beta-blockers and ACE inhibitors can make allergic reactions more severe or harder to treat with emergency medicine. You must provide your doctor with a complete list of all prescriptions, over-the-counter drugs, and herbal supplements you use before any testing or treatment begins.
Allergenic extracts like Brown Rice are biological products and are not 'generic' in the same way that chemical drugs like ibuprofen are. Instead, they are produced by various specialized laboratories (such as Greer, ALK, or Stallergenes Greer) as non-standardized extracts. While different brands may exist, they are not always interchangeable because their protein concentrations and manufacturing processes can vary. Your allergist will typically stick with one manufacturer's extract for the duration of your testing or treatment to ensure consistent results and safety.