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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]
Prunella Vulgaris Flower is a non-standardized plant allergenic extract used primarily in the diagnosis and treatment of specific hypersensitivity reactions. It belongs to the class of non-standardized allergenic extracts used in clinical immunology.
Name
Prunella Vulgaris Flower
Raw Name
PRUNELLA VULGARIS FLOWER
Category
Non-Standardized Plant Allergenic Extract [EPC]
Drug Count
7
Variant Count
7
Last Verified
February 17, 2026
About Prunella Vulgaris Flower
Prunella Vulgaris Flower is a non-standardized plant allergenic extract used primarily in the diagnosis and treatment of specific hypersensitivity reactions. It belongs to the class of non-standardized allergenic extracts used in clinical immunology.
Detailed information about Prunella Vulgaris Flower
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Prunella Vulgaris Flower.
Prunella Vulgaris Flower, commonly known as Self-heal or Heal-all, is a perennial herb in the Lamiaceae (mint) family. In a clinical and pharmacological context, Prunella Vulgaris Flower is classified as a Non-Standardized Plant Allergenic Extract [EPC]. Unlike standardized extracts, which have a potency measured by a specific biological activity or a defined quantity of a major allergen (such as Bioequivalent Allergy Units), non-standardized extracts like Prunella Vulgaris are prepared according to traditional methods where the potency is not precisely quantified against a reference standard.
This extract is primarily utilized by allergists and immunologists for the purpose of diagnostic skin testing (to identify Type I hypersensitivity) and, in specific clinical scenarios, as part of allergen immunotherapy (desensitization). The use of Prunella Vulgaris in clinical medicine is governed by the FDA’s Center for Biologics Evaluation and Research (CBER), as these substances are considered biological products rather than simple small-molecule drugs. Historically, plant extracts have been used for decades in the field of allergy, with their regulatory framework evolving from the Biologics Control Act of 1902 to modern-day safety standards.
At the molecular level, Prunella Vulgaris Flower extract works by eliciting an immunological response in sensitized individuals. When the extract is introduced into the skin (via the percutaneous or intradermal route), the allergenic proteins within the flower extract encounter specific Immunoglobulin E (IgE) antibodies that are bound to the surface of mast cells and basophils.
If the patient is sensitized to Prunella Vulgaris, the allergens cross-link these IgE molecules, triggering a process called degranulation. During degranulation, mast cells release potent inflammatory mediators, most notably histamine, leukotrienes, and prostaglandins. This biochemical cascade results in localized vasodilation (widening of blood vessels) and increased capillary permeability, which manifests clinically as the 'wheal and flare' reaction—a raised, itchy bump surrounded by redness. This reaction is the hallmark of a positive diagnostic test for allergy. In the context of immunotherapy, repeated exposure to gradually increasing doses of the extract is thought to shift the immune response from a Th2-dominated (allergic) profile to a Th1-dominated or T-regulatory (Treg) profile, inducing the production of IgG4 'blocking' antibodies.
Prunella Vulgaris Flower extract is indicated for:
Off-label, some practitioners may use the extract in research settings to study the cross-reactivity between different members of the Lamiaceae family, though this is not a standard clinical indication.
Prunella Vulgaris Flower extract is typically available in the following forms:
> Important: Only your healthcare provider can determine if Prunella Vulgaris Flower is right for your specific condition. The administration of allergenic extracts must be performed under the supervision of a physician trained in the management of anaphylaxis.
Dosage for Prunella Vulgaris Flower extract is highly individualized and depends entirely on the patient's level of sensitivity as determined by clinical history and skin test results.
Prunella Vulgaris Flower extract may be used in children, but extreme caution is required. Dosing follows the same weight/volume principles as adult dosing but must be adjusted based on the child's smaller skin surface area for testing and potentially higher sensitivity. Safety and efficacy in children under the age of 5 have not been extensively established, and the risk-benefit ratio must be carefully considered by a pediatric allergist.
No specific dosage adjustments are typically required for renal impairment, as the systemic protein load is minimal. However, patients with severe renal disease may have altered skin reactivity.
No specific adjustments are required. The metabolism of these proteins is not primarily dependent on hepatic CYP450 enzymes.
Elderly patients may exhibit reduced skin reactivity (false negatives) due to age-related changes in skin turgor and mast cell density. Lower starting doses in immunotherapy are often recommended due to the higher prevalence of comorbid cardiovascular conditions in this population.
This medication is never self-administered. It must be administered by a healthcare professional in a clinical setting equipped with emergency resuscitation equipment.
In immunotherapy, if a dose is missed, the next dose may need to be reduced depending on how much time has passed. If the interval exceeds the recommended schedule by more than one week, the physician may revert to a previous lower dose to prevent an adverse reaction.
An overdose of allergenic extract can lead to severe systemic reactions, including generalized urticaria, angioedema, bronchospasm, and anaphylactic shock.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance.
The most frequent side effects associated with Prunella Vulgaris Flower extract are localized to the site of administration.
> Warning: Stop taking Prunella Vulgaris Flower and call your doctor immediately if you experience any of these.
With prolonged immunotherapy, some patients may develop 'serum sickness-like' symptoms, including joint pain and fever, although this is extremely rare with modern extracts. There is also a theoretical risk of developing new sensitivities to other components in the extract, though the clinical goal is the opposite (tolerance).
While non-standardized extracts may not always carry a formal 'Black Box' in the same format as tablets, the FDA-approved labeling for all allergenic extracts contains a Boxed Warning regarding the risk of severe systemic reactions.
Summary of Warning: Prunella Vulgaris Flower extract can cause severe life-threatening systemic reactions, including anaphylaxis. Patients must be observed for at least 30 minutes after administration in a facility equipped with emergency supplies, including epinephrine. Patients with unstable asthma are at increased risk for severe reactions.
Report any unusual symptoms to your healthcare provider.
Prunella Vulgaris Flower extract is intended for use only by physicians who are experienced in the administration of allergenic extracts and the management of allergic emergencies. Because of the risk of systemic reactions, patients must remain in the doctor's office for a minimum of 30 minutes following any injection or skin test.
No FDA black box warnings for Prunella Vulgaris Flower specifically exist in the same way they do for high-risk pharmaceuticals like opioids, but the class-wide Boxed Warning for Allergenic Extracts is applicable. It emphasizes that these products can cause anaphylaxis and should only be used in settings where emergency resuscitation is immediately available. It also notes that the potency of non-standardized extracts can vary between lots, increasing the risk of reaction when switching vials.
Generally, Prunella Vulgaris Flower extract does not interfere with the ability to drive. However, if a patient experiences a systemic reaction or receives epinephrine, they should not drive until cleared by a physician.
Alcohol should be avoided on the day of an injection or skin test. Alcohol can cause vasodilation, which may potentially increase the rate of allergen absorption and exacerbate a systemic reaction.
Immunotherapy with Prunella Vulgaris Flower is usually discontinued if the patient fails to show clinical improvement after 12-24 months of maintenance therapy, or if the patient experiences repeated severe systemic reactions that cannot be managed by dose adjustment.
> Important: Discuss all your medical conditions with your healthcare provider before starting Prunella Vulgaris Flower.
There are no direct food interactions with Prunella Vulgaris Flower extract. However, patients should avoid heavy meals immediately before or after an injection to ensure that any gastrointestinal symptoms of anaphylaxis (like nausea) are not confused with simple indigestion.
Prunella Vulgaris Flower extract does not interfere with standard blood chemistry or hematology tests. However, it will directly affect the results of:
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking.
Patients allergic to Prunella Vulgaris Flower may show cross-sensitivity to other members of the Lamiaceae family, including:
> Important: Your healthcare provider will evaluate your complete medical history before prescribing Prunella Vulgaris Flower.
Prunella Vulgaris Flower extract is classified as Pregnancy Category C. There are no adequate and well-controlled studies in pregnant women. Animal reproduction studies have not been conducted. The primary concern during pregnancy is the risk of a systemic allergic reaction (anaphylaxis) in the mother, which can lead to a sudden drop in blood pressure and uterine hypoperfusion, potentially causing fetal distress or death. Most allergists recommend against starting new immunotherapy during pregnancy but may continue maintenance doses if the patient is stable and the benefit outweighs the risk.
It is not known whether the allergenic proteins from Prunella Vulgaris Flower extract are excreted in human milk. Because many proteins are digested in the infant's gut, the risk to a nursing infant is considered low. However, the decision to continue immunotherapy while breastfeeding should be made in consultation with a healthcare provider, considering the mother's need for treatment.
As noted, the safety and efficacy of allergenic extracts in children under age 5 have not been established. In older children, the extract is generally safe when administered by a specialist. Children may be more prone to large local reactions, and their inability to clearly communicate early symptoms of a systemic reaction (like an 'itchy throat') requires extra vigilance from the clinical staff.
Clinical studies of Prunella Vulgaris Flower extract did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. In general, dose selection for an elderly patient should be cautious, usually starting at the low end of the dosing range, reflecting the greater frequency of decreased cardiac function and concomitant drug therapy (especially beta-blockers or ACE inhibitors).
No specific studies have been conducted in patients with renal impairment. Since the extract consists of proteins that are naturally degraded into amino acids, renal clearance of the intact allergen is not a major pathway. However, uremia in severe renal failure can suppress skin reactivity, potentially leading to false-negative diagnostic tests.
No studies have been conducted in patients with hepatic impairment. Hepatic metabolism is not a primary route of elimination for allergenic extracts, so dose adjustments based on Child-Pugh classification are not standard.
> Important: Special populations require individualized medical assessment.
Prunella Vulgaris Flower extract acts as an exogenous antigen. In diagnostic use, it facilitates the Type I Hypersensitivity Reaction. Upon contact with the skin's mast cells, the allergens in the extract (which include various proteins and glycoproteins) bind to specific IgE antibodies. This binding causes the IgE receptors (FcεRI) to aggregate, triggering a signal transduction pathway involving tyrosine kinases. This results in the release of pre-formed mediators like histamine and the synthesis of new mediators like leukotriene C4. These substances act on H1 receptors on vascular smooth muscle and endothelial cells, causing the characteristic wheal (edema) and flare (erythema).
In immunotherapy, the mechanism is complex and involves 'immune deviation.' It induces the production of T-regulatory cells that secrete IL-10 and TGF-beta, which suppress the allergic Th2 response. It also promotes the production of IgG4, which acts as a 'blocking antibody' by competing with IgE for allergen binding, thereby preventing mast cell degranulation.
| Parameter | Value |
|---|---|
| Bioavailability | <1% (Percutaneous); ~100% (Subcutaneous injection) |
| Protein Binding | N/A (Biological extract) |
| Half-life | Variable (Proteins degraded within hours/days) |
| Tmax | 15-20 minutes (Skin reaction) |
| Metabolism | Proteolysis by tissue and plasma proteases |
| Excretion | Renal (as amino acids/peptides) |
The extract is a complex mixture. Key chemical constituents of the Prunella vulgaris flower include Rosmarinic acid, Ursolic acid, Oleanolic acid, and various polysaccharides and tannins. The molecular weight of the allergenic proteins typically ranges from 10 kDa to 70 kDa. It is soluble in aqueous buffers and stabilized in 50% glycerin.
Prunella Vulgaris Flower belongs to the Non-Standardized Plant Allergenic Extract [EPC] class. Related medications include other non-standardized extracts like Goldenrod, Dandelion, and various tree or grass pollens.
Common questions about Prunella Vulgaris Flower
In a medical context, Prunella Vulgaris Flower extract is primarily used as a diagnostic tool to identify if a person has an allergy to this specific plant. It is used in skin prick tests where a small amount of the extract is introduced to the skin to see if a 'wheal and flare' reaction occurs. Additionally, it may be used in allergen immunotherapy, commonly known as allergy shots, to help desensitize a patient to the allergen over time. This treatment is intended for patients with allergic rhinitis, conjunctivitis, or asthma triggered by this plant. It is not used to treat acute allergic reactions but rather to diagnose and provide long-term prevention.
The most common side effects are localized to the area where the extract was applied or injected. These include redness, itching, and a raised bump known as a wheal, which typically appear within minutes and resolve within an hour or two. During immunotherapy, some patients may also experience larger areas of swelling or tenderness at the injection site that can last for a day or two. Systemic side effects like sneezing or a mild headache are less common but can occur. Because it is an allergen, there is always a small risk of a more severe reaction, which is why it is only administered in a doctor's office. Always report any significant swelling or spreading hives to your healthcare provider.
It is generally advised to avoid alcohol on the days you receive a Prunella Vulgaris Flower skin test or immunotherapy injection. Alcohol can cause your blood vessels to dilate, which might speed up the absorption of the allergen into your bloodstream and potentially increase the risk or severity of an allergic reaction. Furthermore, alcohol can mask the early symptoms of a systemic reaction, such as flushing or lightheadedness, making it harder for you or your doctor to recognize an emergency. To ensure the highest level of safety, refrain from alcohol consumption for at least 24 hours around your appointment. Discuss your lifestyle habits with your allergist for personalized guidance.
Prunella Vulgaris Flower extract is classified as Pregnancy Category C, meaning there is limited data on its safety in human pregnancy. The main concern is not that the extract itself causes birth defects, but that a severe allergic reaction (anaphylaxis) in the mother could deprive the fetus of oxygen. Most allergists will not start a new course of allergy shots during pregnancy because the risk of a reaction is highest during the 'build-up' phase. However, if a woman is already on a stable maintenance dose and is tolerating it well, the doctor may choose to continue the treatment. You must inform your doctor immediately if you become pregnant while receiving these extracts.
For diagnostic purposes, the extract works very quickly, with results appearing on the skin within 15 to 20 minutes. For immunotherapy (allergy shots), the process is much slower and requires significant patience. Most patients begin to feel an improvement in their allergy symptoms after 6 to 12 months of consistent weekly injections as they reach their maintenance dose. However, the full benefit and long-term protection usually require a total treatment course of 3 to 5 years. If no improvement is seen after a year of maintenance therapy, your doctor may re-evaluate the treatment plan. Consistency is key to the success of this therapy.
Yes, you can stop taking Prunella Vulgaris Flower extract injections at any time without experiencing physical withdrawal symptoms, as it is not an addictive substance. However, stopping immunotherapy prematurely will likely result in the return of your allergy symptoms over time, as your immune system has not been fully desensitized. If you are stopping because of side effects, it is crucial to discuss this with your allergist, as they may be able to adjust the dose instead. If you stop for a period and then wish to restart, you cannot simply resume at your previous dose; you will likely need to start back at a much lower dose for safety. Always consult your healthcare provider before changing your treatment schedule.
If you miss an appointment for your Prunella Vulgaris Flower immunotherapy injection, contact your allergist's office as soon as possible to reschedule. Missing a single dose usually isn't a problem, but the timing of your next dose may need to be adjusted. If too much time passes between injections (usually more than a week or two past your scheduled date), your doctor may need to reduce the dose for your next injection to ensure you don't have an adverse reaction. You should never try to 'double up' on doses to make up for a missed one. Regularity is vital for the immune system to properly develop tolerance to the allergen.
There is no clinical evidence to suggest that Prunella Vulgaris Flower extract causes weight gain. Unlike certain medications like oral corticosteroids (e.g., prednisone) which are often used to treat allergies and can cause weight changes, allergenic extracts are proteins that work specifically on the immune system and do not affect metabolism or appetite. If you experience weight gain while undergoing allergy treatment, it is more likely related to other medications you may be taking or other lifestyle factors. You should discuss any unexpected weight changes with your primary care physician to identify the underlying cause. Your allergist can also review your full medication list with you.
Prunella Vulgaris Flower extract can interact with several types of medications, some of which make the treatment more dangerous. For example, beta-blockers (used for blood pressure) can make an allergic reaction much harder to treat. Other drugs, like antihistamines, antidepressants, and even some heartburn medications, can interfere with the accuracy of skin tests by hiding the allergic response. It is absolutely essential that you provide your allergist with a complete list of every medication, supplement, and herbal product you use. Your doctor will advise you on which medications need to be paused before testing and which are safe to continue during immunotherapy.
The concept of 'generic' vs. 'brand name' is slightly different for allergenic extracts than for standard pills. Prunella Vulgaris Flower extract is a biological product produced by several different specialized laboratories (such as GREER or ALK-Abello). While they all contain the same basic plant proteins, they are 'non-standardized,' meaning the exact potency can vary slightly between different manufacturers. Therefore, they are not considered interchangeable in the same way generic Ibuprofen is. If your doctor switches you from one manufacturer's extract to another, they will often reduce the dose initially to ensure your safety during the transition.