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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Non-Standardized Pollen Allergenic Extract [EPC]
Salix Nigra Pollen is a non-standardized allergenic extract used for the diagnosis and treatment of type I hypersensitivity to Black Willow pollen. It is primarily administered via subcutaneous immunotherapy to desensitize patients with allergic rhinitis or asthma.
Name
Salix Nigra Pollen
Raw Name
SALIX NIGRA POLLEN
Category
Non-Standardized Pollen Allergenic Extract [EPC]
Drug Count
26
Variant Count
28
Last Verified
February 17, 2026
About Salix Nigra Pollen
Salix Nigra Pollen is a non-standardized allergenic extract used for the diagnosis and treatment of type I hypersensitivity to Black Willow pollen. It is primarily administered via subcutaneous immunotherapy to desensitize patients with allergic rhinitis or asthma.
Detailed information about Salix Nigra Pollen
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Salix Nigra Pollen.
Salix Nigra Pollen, derived from the Black Willow tree, is a biological substance used in the field of allergology and clinical immunology. It belongs to a pharmacological class known as Non-Standardized Pollen Allergenic Extracts [EPC]. These extracts are complex mixtures of proteins, glycoproteins, and polysaccharides harvested from the male catkins of the Salix nigra species. In clinical practice, Salix Nigra Pollen is utilized for two primary purposes: the diagnostic identification of specific IgE-mediated allergies (through skin prick testing) and the therapeutic desensitization of allergic individuals (through allergen immunotherapy).
According to the FDA-approved labeling for allergenic extracts, these products are indicated for patients whose symptoms are not adequately controlled by environmental avoidance or conventional pharmacotherapy, such as antihistamines and intranasal corticosteroids. The Black Willow is a deciduous tree native to North America, and its pollen is a significant aeroallergen during the spring months. Patients sensitized to this pollen may experience seasonal allergic rhinitis (hay fever), allergic conjunctivitis (eye inflammation), and allergic asthma.
Salix Nigra Pollen works by modulating the patient's immune system. In an allergic individual, the immune system mistakenly identifies the proteins in the willow pollen as harmful invaders, leading to the production of Specific Immunoglobulin E (sIgE) antibodies. Upon subsequent exposure, these antibodies trigger mast cells and basophils to release inflammatory mediators like histamine, leukotrienes, and cytokines, resulting in typical allergy symptoms.
When administered as immunotherapy (allergy shots), Salix Nigra Pollen is introduced to the body in gradually increasing doses. This process, known as hyposensitization, aims to shift the immune response from a Th2-dominated profile (which promotes allergy) to a Th1-dominated or regulatory T-cell (Treg) profile. Over time, this results in the production of 'blocking antibodies' (IgG4), which intercept the allergen before it can bind to IgE on mast cells. Furthermore, it induces long-term immunological tolerance by reducing the recruitment of eosinophils and mast cells to the mucosal surfaces of the nose and lungs.
Unlike traditional small-molecule drugs, the pharmacokinetics of allergenic extracts like Salix Nigra Pollen are not characterized by traditional absorption, distribution, metabolism, and excretion (ADME) studies. Because these are complex biological mixtures, their movement through the body is analyzed via immunological markers.
Salix Nigra Pollen is FDA-approved for the following indications:
Off-label, some clinicians may use these extracts in cluster or rush immunotherapy protocols to achieve maintenance doses more quickly, though this requires intensive monitoring due to increased systemic risk.
Salix Nigra Pollen is typically available in the following forms:
> Important: Only your healthcare provider can determine if Salix Nigra Pollen is right for your specific condition. Immunotherapy should only be administered by clinicians trained in the management of anaphylaxis.
Dosage for Salix Nigra Pollen is highly individualized and must be determined by an allergist based on the patient's sensitivity levels. There is no 'standard' dose because it is a non-standardized extract.
Typically, the build-up phase starts with a very dilute solution (e.g., 1:100,000 W/V or 1:10,000 W/V). Injections are given once or twice weekly. The dose is increased by 0.05 mL to 0.10 mL at each visit until the 'Maintenance Dose' is reached. A typical maintenance dose ranges from 0.2 mL to 0.5 mL of a 1:20 W/V or 1:10 W/V concentration.
Once the maintenance dose is reached, the interval between injections is increased to every 2 to 4 weeks. This phase usually lasts 3 to 5 years to ensure long-term desensitization.
Salix Nigra Pollen is generally considered safe for pediatric use in children over the age of 5. Dosing follows the same weight/volume progression as adults, but clinicians often use more conservative increments in highly sensitive children. It is generally not recommended for children under 5 years of age because they may have difficulty communicating the early symptoms of a systemic reaction.
No dosage adjustments are formally required for renal impairment, as the extract is not cleared via the kidneys. However, the patient's overall health and ability to tolerate a systemic reaction must be considered.
No dosage adjustments are required for hepatic impairment.
Elderly patients (over 65) require careful evaluation. The risk of immunotherapy-related complications is higher if the patient has underlying cardiovascular disease or is taking medications like beta-blockers, which can complicate the treatment of anaphylaxis.
Salix Nigra Pollen extracts are for subcutaneous injection only. They must never be injected intravenously.
If a dose is missed during the build-up phase, the next dose may need to be reduced depending on how much time has passed.
An 'overdose' in the context of allergenic extracts usually refers to an accidental administration of a concentration higher than the patient's current tolerance level. This can lead to severe systemic reactions or anaphylaxis.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or frequency without medical guidance.
Most patients undergoing immunotherapy with Salix Nigra Pollen will experience local reactions at the site of injection. These are generally considered part of the therapeutic process but must be monitored.
These side effects may indicate that the dose is approaching the patient's limit of tolerance:
> Warning: Stop taking Salix Nigra Pollen and call your doctor immediately if you experience any of these symptoms of anaphylaxis:
There are no known long-term 'toxic' effects of Salix Nigra Pollen extracts on organs like the liver or kidneys. The primary long-term consideration is the potential for 'delayed' local reactions, which appear 6 to 24 hours after an injection. While uncomfortable, these are usually not dangerous but should be reported to the allergist so the next dose can be adjusted.
Report any unusual symptoms to your healthcare provider. Even a mild reaction like itchy palms or a metallic taste in the mouth can be a precursor to a serious event.
Salix Nigra Pollen is a potent biological agent. Its safety depends entirely on correct administration and patient selection. It is not a 'cure' in the traditional sense but a long-term disease-modifying therapy. Patients must be committed to the schedule, as irregular dosing significantly increases the risk of adverse events.
No FDA black box warnings for Salix Nigra Pollen specifically, but it falls under the General Boxed Warning for Allergenic Extracts. This warning emphasizes that these products can cause severe anaphylaxis and must only be administered by physicians who are exceptionally well-versed in the management of life-threatening allergic emergencies. The warning also notes that patients with severe, unstable, or steroid-dependent asthma are at the highest risk for death following a systemic reaction.
Salix Nigra Pollen does not typically cause sedation. However, if a patient experiences a systemic reaction or receives epinephrine, they should not drive or operate machinery until cleared by a physician.
There is no direct chemical interaction between alcohol and Salix Nigra Pollen. However, alcohol consumption can increase peripheral vasodilation, which may theoretically accelerate the absorption of the allergen or mask the early symptoms of a reaction. Patients are generally advised to avoid alcohol for several hours before and after their injection.
If a patient experiences a life-threatening reaction, the risks of continuing Salix Nigra Pollen immunotherapy usually outweigh the benefits. In such cases, the therapy is discontinued. If therapy is stopped for several months, it cannot be resumed at the previous dose; the patient must be re-tested and restart the build-up phase.
> Important: Discuss all your medical conditions with your healthcare provider before starting Salix Nigra Pollen.
While there are few absolute contraindications for drug combinations, the following are highly discouraged:
There are no known direct food-drug interactions with Salix Nigra Pollen. However, patients with 'Oral Allergy Syndrome' (OAS) may experience cross-reactivity. People allergic to Willow pollen may occasionally react to certain raw fruits or vegetables, though this is more common with Birch pollen. Avoiding heavy or spicy meals immediately after an injection is a common-sense precaution to prevent confusing GI distress with an allergic reaction.
There is limited data on herbal interactions. However, supplements that have 'anti-inflammatory' or 'immune-boosting' claims (like Echinacea or high-dose Astragalus) should be used with caution, as they may theoretically interfere with the immune-modulating goals of the extract.
Salix Nigra Pollen will directly affect the results of:
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, especially if you have been prescribed new heart or blood pressure medication.
Salix Nigra Pollen must NEVER be used in the following circumstances:
These conditions require a careful risk-benefit analysis by the allergist:
Salix Nigra (Black Willow) belongs to the Salicaceae family. Patients sensitized to Black Willow may show cross-reactivity with other species of Willow (Salix alba, Salix viminalis) and, to a lesser extent, Poplar and Aspen trees (Populus species). This is due to shared proteins like 'Sal n 1'. If a patient is highly sensitive to one member of the Salicaceae family, they should be tested cautiously with others.
> Important: Your healthcare provider will evaluate your complete medical history, including your lung function and current medications, before prescribing Salix Nigra Pollen.
According to the American Academy of Allergy, Asthma & Immunology (AAAAI), allergen immunotherapy should not be started during pregnancy. This is because the risk of a systemic reaction (and the resulting fetal hypoxia or uterine contractions) outweighs the benefit of starting treatment. However, if a woman is already on a stable maintenance dose and is tolerating it well, the therapy may be continued during pregnancy at the same or a slightly reduced dose. Dosage should never be increased during pregnancy.
Salix Nigra Pollen extracts are not known to pass into breast milk in any significant way. The proteins are broken down at the injection site. Breastfeeding is generally considered safe during immunotherapy. However, the mother should be aware that if she experiences anaphylaxis, the medications used to treat it (like high-dose antihistamines) could temporarily affect milk supply.
As noted, Salix Nigra Pollen is indicated for children aged 5 and older. The efficacy of SCIT in children is well-documented, often preventing the 'allergic march' (the progression from rhinitis to asthma). Clinicians must ensure the child is old enough to sit still for the injection and can describe symptoms like 'itchy throat' or 'tight chest'.
In patients over 65, the decision to use Salix Nigra Pollen must be individualized. Older adults are more likely to have comorbid conditions (COPD, Coronary Artery Disease) that make a systemic reaction more dangerous. Furthermore, the immune system's ability to develop tolerance (immunosenescence) may be reduced, potentially making the treatment less effective than in younger patients.
There is no specific data regarding Salix Nigra Pollen in patients with renal failure. Since the extract is composed of proteins that are metabolized locally and systemically by proteases, renal function does not typically impact the dosing or safety of the product.
Liver function does not affect the metabolism of allergenic extracts. No dosage adjustments are necessary for patients with hepatitis or cirrhosis, provided they are otherwise stable enough to tolerate potential systemic reactions.
> Important: Special populations require individualized medical assessment. Pregnant women or those planning to become pregnant should notify their allergist immediately.
Salix Nigra Pollen acts as an immunomodulator. Its primary molecular mechanism involves the induction of peripheral T-cell tolerance. During the course of therapy, there is a marked increase in the production of Interleukin-10 (IL-10) and Transforming Growth Factor-beta (TGF-β) by regulatory T-cells. These cytokines suppress the Th2 response, which is responsible for IgE production and eosinophil activation. Additionally, the extract induces B-cells to switch from producing IgE to producing IgG4. IgG4 acts as a 'blocking antibody' that competes with IgE for allergen binding sites, preventing the cross-linking of IgE on the surface of mast cells and thus inhibiting the release of histamine.
The pharmacodynamic effect of Salix Nigra Pollen is delayed. While skin reactivity may decrease within months, the full disease-modifying effect (reduction in symptoms and medication use) typically takes 6 to 12 months of consistent treatment. The duration of effect can last for several years after the 3-to-5-year course is completed, a phenomenon known as 'sustained clinical remission'.
| Parameter | Value |
|---|---|
| Bioavailability | N/A (Subcutaneous administration) |
| Protein Binding | N/A (Proteins are processed by APCs) |
| Half-life | Hours (for proteins) to Weeks (for immunological effect) |
| Tmax | 20-30 minutes (for local absorption) |
| Metabolism | Proteolytic degradation |
| Excretion | Not renally excreted |
Salix Nigra Pollen is classified as a Non-Standardized Pollen Allergenic Extract. Unlike 'Standardized' extracts (like Grass or Ragweed), which have their potency measured in Bioequivalent Allergy Units (BAU), non-standardized extracts are labeled by Weight/Volume (W/V) or Protein Nitrogen Units (PNU). This means that the biological activity may vary slightly between different manufactured lots.
Common questions about Salix Nigra Pollen
Salix Nigra Pollen is primarily used as an allergenic extract for the diagnosis and treatment of allergies to the Black Willow tree. In diagnostic settings, it is used in skin prick tests to identify if a patient has specific IgE antibodies to this pollen. In therapeutic settings, it is used in allergen immunotherapy, commonly known as allergy shots. The goal of this treatment is to gradually desensitize the patient's immune system to the pollen, thereby reducing symptoms of hay fever and allergic asthma. It is typically reserved for patients who do not find sufficient relief from standard allergy medications or those who wish to address the underlying cause of their allergies.
The most common side effects are local reactions at the site of the subcutaneous injection. These include redness, itching, and swelling (a wheal) that usually appears within minutes and resolves within a few hours. Some patients may also experience 'late-phase' local reactions, where the swelling appears 6 to 24 hours later. Systemic side effects, though less common, can include sneezing, watery eyes, or hives. Because the extract contains the very substance the patient is allergic to, there is always a small risk of a severe allergic reaction called anaphylaxis. For this reason, all injections must be given in a doctor's office with a mandatory 30-minute observation period.
There is no known chemical interaction between alcohol and Salix Nigra Pollen extracts. However, healthcare providers generally advise against consuming alcohol for several hours before and after an allergy injection. Alcohol can cause blood vessels to dilate (expand), which might theoretically speed up the absorption of the allergen into the bloodstream, increasing the risk of a systemic reaction. Additionally, being under the influence of alcohol could make it difficult for a patient to recognize or report the early, subtle symptoms of an allergic reaction, such as an itchy throat or lightheadedness. It is best to remain sober during the hours surrounding your appointment for maximum safety.
The safety of Salix Nigra Pollen during pregnancy depends on whether the patient is starting or continuing therapy. Medical guidelines generally recommend against starting new allergy immunotherapy during pregnancy because of the risk of anaphylaxis, which can deprive the fetus of oxygen. However, if a patient is already on a stable maintenance dose and has not had significant reactions, most allergists agree that the treatment can be safely continued. The dose is usually kept the same or reduced slightly, but it is never increased while the patient is pregnant. Always inform your allergist immediately if you become pregnant so they can adjust your treatment plan accordingly.
Allergen immunotherapy with Salix Nigra Pollen is a long-term commitment and does not provide immediate relief. Most patients begin to notice a reduction in their allergy symptoms and a decreased need for rescue medications after 6 to 12 months of consistent treatment. The 'build-up' phase, where doses are increased weekly, usually takes 3 to 6 months. Once the 'maintenance' dose is reached, the immune system begins to develop significant tolerance. For the most effective and long-lasting results, the treatment is typically continued for 3 to 5 years. Stopping treatment too early may result in the return of allergy symptoms.
Yes, you can stop taking Salix Nigra Pollen injections at any time without experiencing 'withdrawal' symptoms like those associated with some other medications. However, stopping the injections will halt the process of immune desensitization. If you stop during the build-up phase, your allergy symptoms will likely remain unchanged. If you stop after several years of maintenance, you may have achieved some level of permanent tolerance, but stopping too soon increases the likelihood that your allergies will eventually return. If you need to stop due to a move or financial reasons, discuss a 'tapering' or 'maintenance' plan with your doctor first.
If you miss a dose of Salix Nigra Pollen, you should contact your allergist's office to reschedule as soon as possible. The protocol for a missed dose depends on how long it has been since your last injection. If you are only a few days late, you may be able to continue with your scheduled dose increase. However, if you have missed several weeks, your doctor will likely need to reduce your next dose to ensure safety, as your body's tolerance may have slightly decreased. If a significant amount of time has passed (usually over 4-6 weeks), you might need to restart from a much lower concentration to avoid a systemic reaction.
There is no clinical evidence to suggest that Salix Nigra Pollen allergenic extracts cause weight gain. Unlike oral corticosteroids (like prednisone), which are known to affect metabolism and appetite, allergenic extracts are proteins that work locally and through the immune system. They do not contain hormones or calories that would contribute to weight changes. If you experience weight gain while undergoing immunotherapy, it is likely due to other factors, such as lifestyle changes or other medications you may be taking. Always discuss any unexpected physical changes with your healthcare provider.
Salix Nigra Pollen can be taken alongside most common medications, including standard allergy pills and nasal sprays. However, there are critical exceptions. You must inform your doctor if you are taking beta-blockers (often prescribed for high blood pressure, heart conditions, or migraines), as these can make it very difficult to treat a severe allergic reaction. Other medications of concern include MAO inhibitors and certain antidepressants. While you can continue taking your regular allergy medications, your doctor may ask you to keep your regimen consistent so they can accurately judge how well the immunotherapy is working.
The concept of 'generic' vs. 'brand name' is different for allergenic extracts than for standard pills. Salix Nigra Pollen is a biological product produced by several different specialized laboratories (such as ALK, Greer, or Jubilant HollisterStier). While the 'active ingredient' is the same—pollen from the Salix nigra tree—each manufacturer's extract may have slight differences in protein concentration and stabilizers. Your allergist will typically stick with one manufacturer for your specific treatment course to ensure consistency in your dosing. These are regulated by the FDA as biological products rather than simple generic drugs.