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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]
Cytisus Scoparius Flowering Top is a non-standardized plant allergenic extract and nitrate vasodilator used primarily in allergy immunotherapy and historically for cardiovascular support. It belongs to the class of non-standardized plant allergenic extracts.
Name
Cytisus Scoparius Flowering Top
Raw Name
CYTISUS SCOPARIUS FLOWERING TOP
Category
Non-Standardized Plant Allergenic Extract [EPC]
Drug Count
7
Variant Count
7
Last Verified
February 17, 2026
About Cytisus Scoparius Flowering Top
Cytisus Scoparius Flowering Top is a non-standardized plant allergenic extract and nitrate vasodilator used primarily in allergy immunotherapy and historically for cardiovascular support. It belongs to the class of non-standardized plant allergenic extracts.
Detailed information about Cytisus Scoparius Flowering Top
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Cytisus Scoparius Flowering Top.
Cytisus Scoparius Flowering Top, commonly known as Scotch Broom, is a botanical substance derived from the perennial shrub Cytisus scoparius. In the realm of modern clinical pharmacology, it is primarily classified as a Non-Standardized Plant Allergenic Extract [EPC]. This classification indicates that the extract is used for the diagnosis and treatment of allergic diseases, specifically those triggered by exposure to the pollen or proteins found within the flowering tops of the plant. Additionally, it carries the Established Pharmacologic Class (EPC) designations of Standardized Chemical Allergen, Non-Standardized Food Allergenic Extract, and Nitrate Vasodilator, reflecting a complex phytochemical profile that has both immunological and cardiovascular implications.
Historically, Cytisus scoparius has been utilized in traditional medicine for its diuretic and cathartic properties. However, its inclusion in contemporary drug databases like DailyMed and the FDA's Structured Product Labeling (SPL) system focuses on its role as an allergen. As an allergenic extract, it is designed to help the immune system develop tolerance through a process known as immunotherapy (allergy shots). By exposing the patient to gradually increasing amounts of the allergen, the healthcare provider aims to reduce the severity of allergic rhinitis (hay fever) or allergic asthma symptoms.
It is important to note that while the plant contains alkaloids such as sparteine, which have historically been investigated for their effects on heart rhythm and uterine contractions, the modern FDA-listed uses are largely centered on its allergenic properties. The FDA approval history for non-standardized extracts is unique; many of these substances were grandfathered into use or approved based on long-standing clinical practice rather than the rigorous Phase III clinical trials required for new molecular entities. Patients should understand that 'non-standardized' means the potency is not measured by a federally mandated bioassay, but rather by the weight/volume (w/v) of the extraction process.
The mechanism of action for Cytisus Scoparius Flowering Top depends entirely on its clinical application. When used as an Allergenic Extract, the mechanism is immunological. The extract contains specific proteins (antigens) that, in sensitive individuals, trigger the production of Immunoglobulin E (IgE) antibodies. During immunotherapy, the administration of these antigens induces a shift in the immune response from a Th2-dominated profile (which promotes allergy) to a Th1-dominated profile. This leads to the production of 'blocking antibodies' (IgG4), which intercept the allergen before it can bind to IgE on mast cells, thereby preventing the release of histamine and other inflammatory mediators.
From a Nitrate Vasodilator and cardiovascular perspective, the plant contains sparteine and other quinolizidine alkaloids. Sparteine acts as a Class Ia antiarrhythmic agent (similar to quinidine). It works by blocking sodium channels in the heart's cell membranes, which slows the conduction of electrical impulses and increases the refractory period (the time during which a heart cell cannot be re-stimulated). This can help stabilize certain types of irregular heartbeats. Furthermore, the presence of certain phytochemicals may promote the release of nitric oxide or act directly on vascular smooth muscle to cause vasodilation (widening of blood vessels), which reduces peripheral resistance and lowers blood pressure.
The pharmacokinetics of Cytisus Scoparius Flowering Top are complex because it is a multi-component botanical extract rather than a single purified chemical.
> Important: Only your healthcare provider can determine if Cytisus Scoparius Flowering Top is right for your specific condition. The use of allergenic extracts must be supervised by a physician trained in the management of anaphylaxis.
Dosage for Cytisus Scoparius Flowering Top must be highly individualized based on the patient's sensitivity level and clinical response. There is no 'one-size-fits-all' dose for allergenic extracts.
Cytisus Scoparius Flowering Top extracts can be used in children, but extreme caution is required. Pediatric dosing follows the same escalation principles as adult dosing, but the starting dose may be even lower depending on the child's allergic history. Clinical studies have shown that immunotherapy is generally effective in children aged 5 and older. It is rarely recommended for children under the age of 5 due to the difficulty of communicating symptoms of an impending systemic reaction.
Because the alkaloids in Cytisus scoparius (like sparteine) are primarily excreted by the kidneys, patients with significant renal impairment (decreased kidney function) may require lower doses or more frequent monitoring. However, for standard allergenic immunotherapy, systemic levels are usually low enough that renal adjustment is not standard, though clinical judgment is required.
There are no specific guidelines for hepatic (liver) impairment regarding allergenic extracts. However, if the patient is taking the extract for its nitrate vasodilator or alkaloid properties, liver function should be monitored as the CYP2D6 pathway is involved in metabolism.
Elderly patients may be more sensitive to the cardiovascular effects of the alkaloids. Furthermore, the use of beta-blockers (common in the elderly) is a relative contraindication for immunotherapy because they can make anaphylaxis more difficult to treat.
If a dose of immunotherapy is missed, do not double the next dose. If the interval since the last injection is too long (usually more than 7-14 days beyond the scheduled date), the healthcare provider may need to reduce the dose for safety to avoid a 're-start' reaction. Contact your allergist immediately if you miss an appointment.
An overdose of Cytisus Scoparius Flowering Top extract can lead to severe systemic allergic reactions (anaphylaxis) or alkaloid toxicity.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance.
Most patients undergoing immunotherapy with Cytisus Scoparius Flowering Top will experience local reactions at the site of the injection. These are generally considered normal and expected.
> Warning: Stop taking Cytisus Scoparius Flowering Top and call your doctor immediately if you experience any of these.
With prolonged use of allergenic extracts (3-5 years), the most common long-term effect is the desired desensitization. However, some patients may develop 'delayed local reactions' where the swelling at the injection site doesn't appear until 6-12 hours later. There is no evidence that long-term use of these extracts causes organ damage or cancer. However, the cardiovascular effects of the alkaloids, if used chronically in non-allergenic forms, could theoretically lead to changes in heart rhythm or vascular tone.
Allergenic extracts, including Cytisus Scoparius Flowering Top, can cause severe, life-threatening systemic reactions, including anaphylaxis. This product should only be administered by physicians who are experienced in the treatment of allergic diseases and the management of anaphylaxis. Patients with unstable asthma are at a higher risk for severe reactions. Patients must be observed for at least 30 minutes following administration. Epinephrine must be immediately available. Some patients taking beta-blockers may be resistant to the effects of epinephrine.
Report any unusual symptoms to your healthcare provider.
Cytisus Scoparius Flowering Top is a potent biological product. It must never be used at home or self-administered by the patient. The risk of a systemic reaction is always present, even if the patient has tolerated previous injections without issue. Patients should be in good health at the time of the injection; if you have a fever, respiratory infection, or an active asthma flare-up, your injection should be postponed.
No FDA black box warnings for Cytisus Scoparius Flowering Top specifically as a standalone drug, but it falls under the General Class Warning for Allergenic Extracts. This warning emphasizes that these products can cause anaphylaxis and must be administered in a specialized clinical setting. The warning also highlights that patients with severe or poorly controlled asthma are at increased risk for fatal reactions.
Most patients can drive after their 30-minute observation period. However, if you experience dizziness, fatigue, or 'brain fog' after your injection, you should avoid driving or operating heavy machinery until these symptoms resolve.
Alcohol can increase peripheral vasodilation and may theoretically increase the rate of absorption of the extract from the injection site. It is generally recommended to avoid alcohol for several hours before and after your allergy injection to minimize the risk of a systemic reaction.
If you decide to stop immunotherapy, you should discuss this with your doctor. Stopping suddenly does not cause a 'withdrawal syndrome' in the traditional sense, but your allergy symptoms will likely return to their baseline severity over time. If treatment is interrupted for more than a few weeks, it cannot be resumed at the previous dose level due to the loss of tolerance.
> Important: Discuss all your medical conditions with your healthcare provider before starting Cytisus Scoparius Flowering Top.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking.
Patients allergic to Scotch Broom may also show cross-sensitivity to other members of the Fabaceae (legume) family, such as Gorse (Ulex europaeus) or certain types of clover. If you have known allergies to many different types of beans or legumes, inform your allergist before starting treatment.
> Important: Your healthcare provider will evaluate your complete medical history before prescribing Cytisus Scoparius Flowering Top.
Pregnancy Category C. There are no adequate and well-controlled studies of Cytisus Scoparius Flowering Top in pregnant women. However, the alkaloid sparteine is known to have oxytocic effects, meaning it can cause the uterus to contract. Historically, sparteine was used to induce labor. Therefore, systemic absorption of this extract poses a risk of premature labor or miscarriage. Immunotherapy should only be continued during pregnancy if the benefit clearly outweighs the risk, and the dose should generally not be increased during this time.
It is not known whether the allergenic proteins or the alkaloids from Cytisus scoparius are excreted in human milk. Because many drugs are excreted in milk and the potential for serious adverse reactions in nursing infants exists, caution should be exercised. Most allergists consider maintenance immunotherapy to be safe during breastfeeding, but a risk-benefit discussion is necessary.
Safety and effectiveness in children below the age of 5 have not been established. In children 5 and older, the extract is used similarly to adults. Special care must be taken to monitor for 'behavioral' signs of an allergic reaction in children, such as irritability or sudden quietness, as they may not be able to describe 'throat tightness' or 'dizziness.'
Clinical studies of allergenic extracts generally do not include sufficient numbers of subjects aged 65 and over to determine if they respond differently than younger subjects. In elderly patients, the presence of co-morbidities like coronary artery disease or COPD increases the risk associated with both the extract's alkaloids and the potential for anaphylaxis. Dosing should be approached conservatively.
As the kidneys are the primary route for the elimination of sparteine (70-90%), patients with chronic kidney disease (CKD) should be monitored for signs of alkaloid toxicity. While the amount of alkaloid in a standard allergy injection is small, cumulative effects or high-dose immunotherapy could theoretically lead to issues in those with GFR < 30 mL/min.
No specific dose adjustments are provided for patients with liver disease. However, since the CYP2D6 pathway is the secondary route of metabolism, patients with severe cirrhosis should be monitored for prolonged effects of the nitrate vasodilator or antiarrhythmic components.
> Important: Special populations require individualized medical assessment.
Cytisus Scoparius Flowering Top acts through two distinct pathways:
| Parameter | Value |
|---|---|
| Bioavailability | ~30% (Oral sparteine); Variable (SC injection) |
| Protein Binding | ~15-20% |
| Half-life | 2.1 - 4.4 hours (Sparteine) |
| Tmax | 1 - 2 hours |
| Metabolism | Hepatic (CYP2D6) |
| Excretion | Renal (70-90% unchanged) |
Cytisus Scoparius Flowering Top is classified as a Non-Standardized Plant Allergenic Extract. It is grouped with other allergenic extracts like Ragweed, Timothy Grass, and Oak. Its secondary classification as a Nitrate Vasodilator puts it in the same functional category as Nitroglycerin, although its mechanism (via alkaloids) is distinct from traditional organic nitrates.
Common questions about Cytisus Scoparius Flowering Top
Cytisus Scoparius Flowering Top, or Scotch Broom, is primarily used as an allergenic extract for the diagnosis and treatment of allergies. In a clinical setting, it is used in skin tests to identify if a patient is allergic to the plant's pollen and in 'allergy shots' (immunotherapy) to help patients build tolerance. By receiving gradually increasing doses, the immune system learns to stop overreacting to the allergen, reducing symptoms like sneezing, itchy eyes, and asthma flares. It also has historical uses as a nitrate vasodilator for certain heart conditions due to its alkaloid content. However, its most common modern application is in the field of allergy and immunology.
The most common side effects are local reactions at the site of the injection, which occur in over 90% of patients at some point during treatment. These include redness, swelling, itching, and warmth in the arm where the shot was given. These reactions are usually mild and disappear within 24 hours. Some patients may also experience a temporary increase in their typical allergy symptoms, such as sneezing or a stuffy nose, shortly after the injection. Fatigue and a mild headache are also frequently reported. While these are common, they are generally not dangerous and can be managed with over-the-counter relievers if approved by your doctor.
It is generally advised to avoid alcohol on the days you receive an injection of Cytisus Scoparius Flowering Top. Alcohol causes your blood vessels to dilate (expand), which can speed up the absorption of the extract from the injection site into your bloodstream. This rapid absorption increases the risk of a systemic allergic reaction or anaphylaxis. Furthermore, alcohol can make it harder for you to notice early warning signs of a reaction, such as dizziness or flushing. To ensure maximum safety during your immunotherapy, stay hydrated with water and avoid alcoholic beverages for at least 24 hours around your appointment.
Cytisus Scoparius Flowering Top is generally not recommended for initiation during pregnancy. The plant contains an alkaloid called sparteine, which is known to cause uterine contractions and was historically used to induce labor. This poses a significant risk of premature birth or miscarriage if systemic absorption occurs. Furthermore, if a pregnant woman has a severe allergic reaction (anaphylaxis) to the injection, the resulting drop in blood pressure can deprive the fetus of oxygen. While doctors may continue maintenance doses for women who were already on the therapy before becoming pregnant, starting the treatment while pregnant is typically avoided.
Immunotherapy with Cytisus Scoparius Flowering Top is a long-term commitment and does not provide immediate relief like an antihistamine pill. Most patients begin to notice a decrease in their allergy symptoms during the 'maintenance phase,' which usually starts 3 to 6 months after beginning the injections. Significant improvement is typically seen after one full year of treatment. For the most effective and long-lasting results, a full course of 3 to 5 years is generally recommended. If you do not see any improvement after 12 months of maintenance therapy, your allergist may re-evaluate the treatment plan.
Yes, you can stop taking Cytisus Scoparius Flowering Top injections without experiencing withdrawal symptoms, as it is not an addictive substance. However, stopping treatment before the recommended 3-to-5-year course is finished usually means your allergies will eventually return to their original severity. If you miss several doses due to illness or travel, you cannot simply resume at your previous dose because your body may have lost some of its tolerance, increasing the risk of a reaction. Always consult your allergist before stopping, as they can help you weigh the pros and cons of ending treatment early.
If you miss a scheduled allergy shot, contact your allergist's office as soon as possible to reschedule. Do not attempt to 'make up' the dose by taking more the next time. The safety of immunotherapy depends on a strict schedule of gradually increasing exposure. If too much time passes between injections (usually more than 10-14 days), your doctor may need to reduce your next dose or even step back several levels in your build-up schedule to ensure your safety. Consistency is key to the success of the treatment, so try to keep your appointments as regular as possible.
There is no clinical evidence to suggest that Cytisus Scoparius Flowering Top allergenic extracts cause weight gain. Unlike oral corticosteroids (like prednisone), which are sometimes used for severe allergies and are well-known for causing weight changes, allergenic extracts work on the immune system without affecting your metabolism or appetite. If you experience unexpected weight gain while on this treatment, it is likely due to other factors, such as lifestyle changes or other medications you may be taking. You should discuss any significant changes in your weight with your primary care physician.
Cytisus Scoparius Flowering Top can interact with several types of medications, some quite seriously. The most important interaction is with beta-blockers (used for heart rhythm and blood pressure), which can make it very difficult to treat a severe allergic reaction. It can also interact with MAO inhibitors and certain antidepressants. Because the extract contains alkaloids that affect the heart, it should be used cautiously with other heart medications like digoxin. Always provide your allergist with a complete and updated list of all medications, including herbal supplements, to ensure that your treatment is safe and effective.
The concept of 'generic' vs. 'brand name' is slightly different for allergenic extracts than for standard pills. Most Cytisus Scoparius Flowering Top extracts are produced by specialized biological laboratories (such as Greer, ALK, or HollisterStier) and are considered 'non-standardized' biological products. While there may be different manufacturers, they are not typically referred to as generics. Instead, they are referred to by their common name and their concentration (w/v). Your allergist will select a high-quality extract from a reputable supplier, and the specific brand usually does not change the effectiveness of the treatment.