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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]
Crataegus Laevigata Whole is a non-standardized plant allergenic extract and nitrate vasodilator used for allergy diagnostics and cardiovascular support. It belongs to the Rosaceae family and is utilized in both clinical immunology and integrative cardiology.
Name
Crataegus Laevigata Whole
Raw Name
CRATAEGUS LAEVIGATA WHOLE
Category
Non-Standardized Plant Allergenic Extract [EPC]
Drug Count
8
Variant Count
8
Last Verified
February 17, 2026
About Crataegus Laevigata Whole
Crataegus Laevigata Whole is a non-standardized plant allergenic extract and nitrate vasodilator used for allergy diagnostics and cardiovascular support. It belongs to the Rosaceae family and is utilized in both clinical immunology and integrative cardiology.
Detailed information about Crataegus Laevigata Whole
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Crataegus Laevigata Whole.
Crataegus Laevigata Whole refers to the comprehensive extract derived from the Midland Hawthorn, a thorny shrub or small tree native to Europe and North Africa. In the clinical landscape, it is classified under the Established Pharmacologic Class (EPC) as a Non-Standardized Plant Allergenic Extract [EPC] and a Nitrate Vasodilator [EPC]. This dual classification reflects its varied utility: first, as a diagnostic tool in allergy medicine to identify hypersensitivity to Rosaceae family pollens, and second, as a therapeutic agent known for its cardiovascular properties.
Crataegus Laevigata Whole belongs to a class of drugs called allergenic extracts when used for diagnostic or desensitization purposes, but it is also recognized as a non-standardized food allergenic extract. Historically, Crataegus species have been used for centuries in traditional medicine, but modern clinical pharmacology has sought to define its role more precisely. The 'Whole' designation implies that the extract is prepared from the entire plant or a combination of its parts (leaves, flowers, and berries), capturing a broad spectrum of phytochemicals including oligomeric proanthocyanidins (OPCs), flavonoids (such as vitexin and hyperoside), and triterpenes.
While many plant extracts are standardized to a specific marker (like 2.2% flavonoids), the 'Non-Standardized' label indicates that the potency is not measured by a specific biological activity or chemical concentration in every batch, which is a critical distinction for healthcare providers when determining dosage and predicting patient response. The FDA has a long history of regulating these extracts under the Center for Biologics Evaluation and Research (CBER), particularly for their use in skin prick testing and subcutaneous immunotherapy (SCIT).
The mechanism of action for Crataegus Laevigata Whole is multifaceted, depending on the route of administration and the clinical intent.
When used as an allergenic extract, Crataegus Laevigata Whole works by eliciting a controlled immune response. For diagnostic purposes (skin testing), the extract is introduced into the epidermis. If the patient has pre-existing IgE antibodies (Immunoglobulin E) specific to the Hawthorn proteins, these antibodies bind to the allergens, causing mast cells to degranulate. This releases histamine and other inflammatory mediators, resulting in a 'wheal and flare' reaction. In the context of immunotherapy, repeated, escalating doses of the extract are administered to shift the immune response from a Th2-mediated (allergic) profile to a Th1-mediated or T-regulatory cell response, inducing clinical tolerance.
As a Nitrate Vasodilator [EPC], the extract exerts significant effects on the vascular endothelium and the myocardium. At the molecular level, Crataegus Laevigata Whole is thought to enhance the release of nitric oxide (NO) from the vascular endothelium. Nitric oxide activates guanylate cyclase, increasing levels of cyclic guanosine monophosphate (cGMP), which leads to smooth muscle relaxation and subsequent vasodilation. This reduces both preload and afterload on the heart. Furthermore, the oligomeric proanthocyanidins in the extract are known to inhibit 3',5'-cyclic adenosine monophosphate (cAMP) phosphodiesterase. By inhibiting this enzyme, the extract increases intracellular cAMP levels, which promotes a positive inotropic effect (increased force of contraction) without a significant increase in oxygen demand.
Understanding the pharmacokinetics of a non-standardized plant extract is complex, as it involves the absorption and metabolism of dozens of distinct chemical constituents.
Crataegus Laevigata Whole is utilized in several clinical contexts, though its primary FDA-recognized roles are diagnostic:
Crataegus Laevigata Whole is available in several preparations, primarily dictated by its use case:
> Important: Only your healthcare provider can determine if Crataegus Laevigata Whole is right for your specific condition. The use of allergenic extracts must be supervised by a specialist trained in emergency allergy management.
Dosage for Crataegus Laevigata Whole varies significantly based on whether it is being used for diagnostic allergy testing, immunotherapy, or cardiovascular support.
For skin prick testing, a single drop of the non-standardized extract (typically at a concentration of 1:20 w/v) is applied to the skin, followed by a puncture. For intradermal testing, 0.02 mL of a much more dilute solution (e.g., 1:1000 w/v) may be injected. These procedures are performed once per diagnostic session.
Immunotherapy involves a 'build-up phase' and a 'maintenance phase':
While not standardized, clinical trials for Hawthorn extracts often use dosages ranging from 160 mg to 900 mg daily, divided into two or three doses. Healthcare providers may start at a lower dose to assess tolerance to the vasodilatory effects.
Crataegus Laevigata Whole is not generally recommended for children under the age of 12 for cardiovascular purposes due to a lack of safety data. For allergy testing and immunotherapy, pediatric use is common but must be strictly managed by a pediatric allergist. Dosing is typically based on sensitivity levels rather than weight, starting with higher dilutions to minimize the risk of systemic reactions.
There are no specific established dosage adjustments for renal impairment; however, because metabolites are excreted renally, healthcare providers should exercise caution. In patients with Stage 4 or 5 chronic kidney disease, lower oral doses may be considered to prevent accumulation of phytochemical metabolites.
As the liver is the primary site for flavonoid glucuronidation, patients with significant hepatic cirrhosis (Child-Pugh Class B or C) should be monitored closely for increased side effects, such as dizziness or hypotension. No formal adjustment guidelines exist for the non-standardized extract.
Elderly patients are more susceptible to the orthostatic hypotensive effects of vasodilators. Healthcare providers often recommend a 'start low, go slow' approach, beginning at the lowest possible oral dose and monitoring blood pressure frequently.
Signs of overdose with Crataegus Laevigata Whole may include:
In the event of a suspected overdose, especially if the patient is fainting or having difficulty breathing, seek emergency medical attention immediately or contact a poison control center.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or stop treatment without medical guidance, as sudden discontinuation of a vasodilator can occasionally cause rebound symptoms.
When used as an allergenic extract for skin testing, the most common side effect is a localized reaction at the site of administration. This includes:
These effects are more frequently associated with the oral use of Crataegus Laevigata Whole as a vasodilator:
> Warning: Stop taking Crataegus Laevigata Whole and call your doctor immediately if you experience any of these.
Long-term use of Crataegus Laevigata Whole is generally well-tolerated in clinical studies lasting up to 2 years. However, potential long-term issues include:
No FDA black box warnings for Crataegus Laevigata Whole. However, it is important to note that the FDA requires all allergenic extracts to carry a general warning regarding the risk of severe systemic reactions, including anaphylaxis, and mandates that they only be administered by trained professionals in facilities equipped with emergency resuscitation equipment (e.g., Epinephrine, oxygen, airway management tools).
Report any unusual symptoms to your healthcare provider. Monitoring for changes in heart rhythm or blood pressure is recommended during the first few weeks of therapy.
Crataegus Laevigata Whole is a potent biological and pharmacological agent. It should never be used without a clear clinical indication and professional supervision. Patients with a known history of severe asthma should be stabilized before undergoing allergy testing with this extract, as they are at a higher risk for severe bronchospasm during the procedure.
No FDA black box warnings for Crataegus Laevigata Whole. However, the class-wide warning for allergenic extracts emphasizes that these products can cause severe life-threatening systemic reactions. Healthcare providers must ensure that patients remain under observation for a minimum of 30 minutes following any injection of the extract.
Crataegus Laevigata Whole may cause dizziness, vertigo, or mild sedation in some patients. Do not drive, operate heavy machinery, or engage in dangerous activities until you know how this medication affects you. This is particularly important during the 'build-up' phase of immunotherapy or when first starting oral vasodilatory doses.
Alcohol is a known vasodilator. Consuming alcohol while taking Crataegus Laevigata Whole can have an additive effect, significantly increasing the risk of hypotension, fainting, and severe headaches. It is strongly advised to limit or avoid alcohol consumption while using this medication.
Do not stop taking Crataegus Laevigata Whole suddenly if you are using it for cardiovascular support. While it does not have a typical 'withdrawal syndrome' like beta-blockers, a sudden cessation of vasodilatory support could lead to a temporary increase in blood pressure or a return of heart failure symptoms. Always consult your doctor for a tapering schedule if discontinuation is necessary.
> Important: Discuss all your medical conditions, especially heart rhythm disorders and asthma, with your healthcare provider before starting Crataegus Laevigata Whole.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking. A complete medication reconciliation is vital to prevent dangerous vasodilatory or immunological interactions.
Crataegus Laevigata Whole must NEVER be used in the following circumstances:
Conditions requiring a careful risk-benefit analysis by a healthcare provider:
Crataegus Laevigata Whole belongs to the Rosaceae family. Patients who have experienced allergic reactions to the following may be cross-sensitive:
> Important: Your healthcare provider will evaluate your complete medical history, including any history of fainting or severe allergies, before prescribing Crataegus Laevigata Whole.
There are no adequate and well-controlled studies of Crataegus Laevigata Whole in pregnant women. Some traditional data suggest that Hawthorn extracts may possess uterine-stimulating properties, which could theoretically increase the risk of preterm labor. In the context of 'Nitrate Vasodilators,' the risk of maternal hypotension could lead to reduced placental perfusion. Use during pregnancy is generally not recommended unless the potential benefit justifies the potential risk to the fetus. If a woman becomes pregnant while on immunotherapy, the dose is typically not increased, but maintenance may be continued under strict supervision.
It is not known whether the constituents of Crataegus Laevigata Whole are excreted in human milk. Because many phytochemicals and proteins have low molecular weights, passage into breast milk is possible. The effect on the nursing infant is unknown. Healthcare providers usually recommend caution and may suggest suspending use while breastfeeding, particularly if the infant has a history of allergies or cardiac issues.
Patients over the age of 65 may be more sensitive to the effects of Crataegus Laevigata Whole.
No specific dosage adjustments are provided in the manufacturer's labeling for Crataegus Laevigata Whole. However, since many of the flavonoid metabolites are excreted via the kidneys, patients with a GFR < 30 mL/min should be monitored for signs of toxicity, such as excessive dizziness or gastrointestinal distress. It is not known if the active components are cleared by hemodialysis.
In patients with hepatic impairment, the metabolism of flavonoids via glucuronidation may be impaired. This could lead to higher systemic levels of the extract. Patients with Child-Pugh Class B or C cirrhosis should be monitored closely for hypotensive effects. Use with caution in patients with active liver disease.
> Important: Special populations require individualized medical assessment. Always inform your specialist if you are pregnant, planning to become pregnant, or are breastfeeding.
Crataegus Laevigata Whole acts through several distinct molecular pathways:
| Parameter | Value |
|---|---|
| Bioavailability | 10% - 25% (highly variable) |
| Protein Binding | >80% (primarily Albumin) |
| Half-life | 2 - 5 hours (major flavonoids) |
| Tmax | 1.5 - 4 hours |
| Metabolism | Hepatic (Phase II Glucuronidation) |
| Excretion | Renal (60%), Fecal (40%) |
Crataegus Laevigata Whole is classified as a Non-Standardized Plant Allergenic Extract and a Nitrate Vasodilator. It shares therapeutic space with other plant-based cardiotonics and nitrate-class medications like Isosorbide, though its mechanism is unique due to its phosphodiesterase-inhibiting properties.
Common questions about Crataegus Laevigata Whole
Crataegus Laevigata Whole is primarily used in two clinical areas: allergy medicine and cardiovascular support. In allergy medicine, it serves as a diagnostic tool for skin testing to identify sensitivities to the Hawthorn plant and is used in immunotherapy (allergy shots) to desensitize patients. In cardiology, it is recognized as a 'Nitrate Vasodilator' and is sometimes used as an adjunctive therapy for mild to moderate heart failure. It helps improve blood flow by relaxing blood vessels and may slightly increase the heart's pumping force. Always use this under the guidance of a healthcare professional, as its 'non-standardized' nature means potency can vary.
The side effects of Crataegus Laevigata Whole depend on how it is administered. When used for allergy skin testing, the most common effects are local redness, itching, and a raised bump at the test site. When taken orally for its vasodilatory effects, common side effects include dizziness, headache, nausea, and palpitations. Some patients may also experience fatigue or sweating as their body adjusts to lower blood pressure. While these are usually mild, any severe dizziness or signs of an allergic reaction should be reported to a doctor immediately.
It is generally advised to avoid or strictly limit alcohol while taking Crataegus Laevigata Whole. Because this extract acts as a nitrate vasodilator, it lowers blood pressure by relaxing the blood vessels. Alcohol also has vasodilatory properties, and combining the two can lead to an additive effect. This significantly increases the risk of a dangerous drop in blood pressure, which can cause fainting, severe headaches, and extreme dizziness. Consult your healthcare provider about your specific risks before consuming alcohol.
The safety of Crataegus Laevigata Whole during pregnancy has not been clearly established through clinical trials. Traditional use suggests that some components of the plant may act as a uterine stimulant, which could potentially pose a risk to the pregnancy. Additionally, its effects on blood pressure could interfere with placental blood flow. Most healthcare providers recommend avoiding its use during pregnancy unless it is deemed absolutely necessary for the mother's health. If you are pregnant or planning to become pregnant, discuss alternative treatments with your doctor.
The onset of action for Crataegus Laevigata Whole varies by its use. For allergy skin testing, a reaction typically appears within 15 to 20 minutes. For its cardiovascular (vasodilatory) effects, patients may notice a slight improvement in symptoms within 1 to 2 hours of an oral dose, but the full therapeutic benefits for heart failure support often take 4 to 8 weeks of consistent use to become apparent. If used for immunotherapy, it can take several months of 'build-up' doses before a patient begins to feel a reduction in their allergy symptoms.
You should not stop taking Crataegus Laevigata Whole suddenly if you are using it for heart-related conditions without first consulting your healthcare provider. While it does not cause a traditional withdrawal syndrome, stopping a vasodilator abruptly can cause your blood pressure to rise quickly or your heart failure symptoms to return. If you are receiving allergy shots (immunotherapy), missing doses or stopping suddenly will halt the desensitization process and may require you to restart at a lower dose for safety. Always follow a medically supervised tapering plan if you need to discontinue the medication.
If you miss an oral dose of Crataegus Laevigata Whole, take it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular routine. Do not take two doses at once to make up for the missed one. If you miss an appointment for an allergy injection, call your allergist's office immediately. Missing an immunotherapy dose may require your doctor to adjust your next dose downward to prevent a systemic allergic reaction when you resume treatment.
There is currently no clinical evidence to suggest that Crataegus Laevigata Whole causes weight gain. Unlike some other cardiovascular medications like certain beta-blockers or steroids, Hawthorn extract does not typically affect metabolism or appetite in a way that leads to weight accumulation. In fact, by improving exercise tolerance in heart failure patients, it may indirectly help with weight management. If you notice sudden weight gain or swelling in your ankles while taking this medication, contact your doctor, as this could be a sign of worsening heart failure rather than a side effect of the drug itself.
Crataegus Laevigata Whole has several important drug interactions that must be managed by a doctor. It should never be taken with PDE5 inhibitors like Sildenafil (Viagra) due to the risk of a fatal drop in blood pressure. It may also interact with Digoxin, blood pressure medications, and blood thinners like Warfarin. Because it is a 'Non-Standardized' extract, its effects on other drugs can be unpredictable. Always provide your healthcare provider with a full list of all prescription drugs, over-the-counter medicines, and herbal supplements you are currently taking.
Crataegus Laevigata Whole is a biological plant extract, and the concept of 'generic' vs. 'brand' works differently than with synthetic chemicals. It is available from various manufacturers of allergenic extracts and as various dietary supplement brands. However, because it is 'Non-Standardized,' products from different manufacturers may have different concentrations of active phytochemicals and are not necessarily interchangeable. For allergy immunotherapy, it is vital to stay with the same manufacturer's extract throughout your treatment course unless your allergist specifically transitions you to a different one.