According to the FDA (2024), Anas Platyrhynchos Feather is classified as a non-standardized allergenic extract, meaning its potency is determined by weight/volume rather than biological units.
A study in the Journal of Allergy and Clinical Immunology (2022) noted that feather extracts often contain cross-reactive proteins with other avian species like geese and chickens.
The AAAAI (2023) guidelines state that patients must be observed for a minimum of 30 minutes following any allergenic extract injection to manage potential anaphylaxis.
Data from DailyMed (2024) indicates that glycerinated extracts of Anas Platyrhynchos Feather are preferred for percutaneous testing due to increased protein stability.
Research published in the Annals of Allergy, Asthma & Immunology (2021) suggests that bird-feather immunotherapy can significantly reduce the need for rescue inhalers in asthmatic patients.
The World Allergy Organization (WAO, 2023) highlights that uncontrolled asthma is the leading risk factor for fatal reactions during allergenic extract administration.
According to NIH PubChem data, the primary allergenic proteins in duck feathers include keratins and various serum albumins that may cross-react with duck meat.
Clinical trials cited by the European Academy of Allergy and Clinical Immunology (EAACI, 2024) show that a 3-year course of SCIT can provide symptom relief for up to 7 years post-discontinuation.
This page is for informational purposes only and does not replace medical advice. Before using any prescription or over-the-counter medication for Animal Antigens, you must consult a qualified healthcare professional.
Clinical Information
Detailed information about Animal Antigens
ℹ️Overview
Anas Platyrhynchos Feather is a non-standardized allergenic extract derived from Mallard duck feathers, utilized primarily in the diagnosis and immunotherapy of bird-related allergic sensitivities.
💊Usage & Dosage
Adult Dosage
Dosage for Anas Platyrhynchos Feather is highly individualized and is determined by the patient's level of sensitivity, which is assessed via skin testing. There is no 'standard' dose for all patients.
Diagnostic Dosing
Skin Prick Test (Percutaneous): Typically performed using a concentration of 1:10 or 1:20 w/v. A single drop is applied to the skin, and the skin is pricked through the drop.
Intradermal Test: If the prick test is negative, an intradermal injection of 0.02 to 0.05 mL of a much more dilute solution (e.g., 1:1000 w/v or 1:100 w/v) may be administered.
Therapeutic Dosing (Immunotherapy)
Immunotherapy is divided into two distinct phases:
1Build-up Phase: This phase involves weekly or bi-weekly injections. The starting dose is usually very low (e.g., 0.05 mL of a 1:10,000 w/v dilution). The dose is gradually increased every 1–2 weeks based on the patient's tolerance.
2Maintenance Phase: Once the 'top dose' or 'maintenance dose' is reached (often 0.5 mL of a 1:10 or 1:20 w/v solution), the frequency of injections is decreased to once every 2–4 weeks. This phase typically lasts 3 to 5 years.
Pediatric Dosage
Anas Platyrhynchos Feather is used in pediatric populations, as allergies often manifest in childhood. However, the safety and efficacy in children under the age of 5 have not been extensively established in large-scale clinical trials. For children over 5, the dosing logic remains the same as for adults—based on individual sensitivity and reaction to the build-up phase. Pediatric patients must be monitored even more closely for signs of systemic reactions, as they may have more difficulty communicating early symptoms of anaphylaxis.
Dosage Adjustments
Renal Impairment
No specific dosage adjustments are typically required for patients with renal impairment, as the proteins are metabolized proteolytically. However, the patient's overall health and ability to tolerate a systemic reaction must be considered.
Hepatic Impairment
No specific adjustments are required for hepatic impairment. The liver is not the primary site of clearance for these protein-based extracts.
Elderly Patients
Caution is advised in elderly patients. The primary concern is the presence of underlying cardiovascular disease. If an elderly patient experiences a severe systemic reaction (anaphylaxis), the use of epinephrine may place additional strain on the heart. Healthcare providers will perform a risk-benefit analysis before starting immunotherapy in patients over 65.
How to Take Anas Platyrhynchos Feather
Administration: This medication is NEVER self-administered. It must be given by a healthcare professional in a clinical setting equipped to handle anaphylaxis.
Observation: Patients MUST remain in the clinic for at least 30 minutes following an injection. Most fatal reactions to allergenic extracts occur within this window.
Site of Injection: Subcutaneous tissue of the outer aspect of the upper arm. The site should be rotated between arms for each visit.
Storage: Extracts must be stored in a refrigerator at 2°C to 8°C (36°F to 46°F). They must not be frozen.
Missed Dose
In immunotherapy, consistency is vital. If a dose is missed during the build-up phase, the next dose may need to be reduced to ensure safety. If a dose is missed during the maintenance phase, the healthcare provider will decide whether to repeat the last dose or reduce it, depending on how much time has passed (e.g., if more than 4 weeks have passed since the last maintenance shot).
Overdose
An 'overdose' in this context refers to an injection of an allergen concentration higher than what the patient can tolerate. This can lead to a severe systemic reaction or anaphylaxis.
Signs of Overdose/Systemic Reaction:
Generalized flushing or itching
Hives (urticaria)
Swelling of the throat or tongue
Wheezing or difficulty breathing
Rapid drop in blood pressure (hypotension)
Emergency Measures:
Immediate administration of Epinephrine (1:1000) intramuscularly.
Application of a tourniquet above the injection site to slow absorption.
Administration of antihistamines and corticosteroids.
Emergency transport to a hospital if symptoms do not resolve immediately.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance. Never attempt to administer this extract at home.
⚠️Side Effects
Common Side Effects (>1 in 10)
Local reactions are the most frequent side effects associated with Anas Platyrhynchos Feather extracts. These occur at the site of the skin test or immunotherapy injection.
Local Erythema (Redness): A red area around the injection site is expected. This usually appears within minutes and may last for several hours.
Local Edema (Swelling): A 'wheal' or 'lump' at the site. If the swelling is larger than a silver dollar (approx. 3-5 cm), it is considered a 'large local reaction.'
Pruritus (Itching): Intense itching at the injection site is very common and typically subsides within 24 hours.
Tenderness: The area may feel bruised or sore to the touch for a day or two.
🔴Warnings
Important Safety Information
Anas Platyrhynchos Feather extract is a potent biological substance that must be handled with extreme caution. It is intended for use only by physicians who are experienced in the diagnosis and treatment of allergic diseases. The most critical safety point is that this extract can induce anaphylaxis at any time, even in patients who have previously tolerated the same dose.
Black Box Warnings
No FDA black box warnings specifically for Anas Platyrhynchos Feather exist as a standalone product, but it is subject to the general warnings for all allergenic extracts. These warnings emphasize that the product should only be administered in settings where emergency equipment (oxygen, epinephrine, IV fluids) is immediately available and by staff trained in emergency resuscitation.
Major Precautions
Anaphylaxis Risk: This is the primary concern. Patients must be educated on the signs of anaphylaxis and the importance of the 30-minute waiting period.
🔄Interactions
Contraindicated Combinations (Do Not Use Together)
There are few absolute contraindications for drug combinations, but the following are highly discouraged:
Non-Selective Beta-Blockers: Drugs like propranolol or nadolol. These drugs prevent epinephrine from working effectively. If a patient on these drugs has anaphylaxis from the duck feather extract, standard emergency treatment may fail, leading to a fatal outcome.
Serious Interactions (Monitor Closely)
Selective Beta-Blockers: (e.g., Atenolol, Metoprolol). While slightly less risky than non-selective ones, they still pose a significant threat during anaphylaxis treatment.
ACE Inhibitors: (e.g., Lisinopril, Enalapril). Some evidence suggests that ACE inhibitors may increase the risk of more severe systemic reactions or interfere with the body's natural compensatory mechanisms during an allergic reaction.
🚫Contraindications
Absolute Contraindications
Anas Platyrhynchos Feather must NEVER be used in the following circumstances:
1Severe, Uncontrolled Asthma: Patients whose asthma is not well-managed with standard medications are at an unacceptably high risk of a fatal bronchial reaction following an allergen injection.
2Recent Myocardial Infarction (Heart Attack): Within the last 3-6 months. The heart must be stable enough to handle the potential stress of anaphylaxis and epinephrine.
3History of Severe Anaphylaxis to this Specific Extract: If a patient has already had a near-fatal reaction to duck feather extract, the risks of continuing immunotherapy usually outweigh the benefits.
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👥Special Populations
Pregnancy
FDA Pregnancy Category: Not formally assigned, but generally handled with caution.
Risk Summary: The primary risk to the fetus is maternal anaphylaxis, which can lead to a sudden drop in blood pressure and oxygen delivery to the placenta.
Clinical Practice: Allergists typically do not start new immunotherapy (the build-up phase) during pregnancy. However, if a woman is already on a maintenance dose and is tolerating it well, the injections are usually continued at that same dose. The dose is not increased during pregnancy.
Breastfeeding
Anas Platyrhynchos Feather extracts are not known to pass into breast milk in any significant way. The proteins are broken down at the injection site and in the lymphatic system. Breastfeeding is generally considered safe for women receiving allergy shots. There are no known adverse effects on the nursing infant.
🧬Pharmacology
Mechanism of Action
Anas Platyrhynchos Feather extract acts as an immunomodulator. In the diagnostic phase, it acts as an antigen that cross-links IgE on the surface of mast cells. In the therapeutic phase, it works by inducing 'desensitization' or 'tolerance.' This involves the induction of regulatory T cells (Tregs) that secrete IL-10, which suppresses the Th2-driven allergic response. It also promotes a 'class switch' in B cells from producing IgE to producing IgG4, which acts as a 'blocking antibody.'
Pharmacodynamics
Onset of Action: For skin testing, the onset is 15–20 minutes. For immunotherapy, clinical improvement may not be noticed for 3–6 months, with maximum benefit often taking 12–24 months.
Duration of Effect: The diagnostic wheal-and-flare typically resolves within 2–4 hours. The therapeutic effect of a completed 3-5 year course of immunotherapy can last for many years, or even a lifetime, after the injections are stopped.
Frequently Asked Questions
Common questions about Animal Antigens
What is Anas Platyrhynchos Feather used for?
Anas Platyrhynchos Feather extract is primarily used for the diagnosis and treatment of allergies to Mallard duck feathers. Healthcare providers use it in skin prick tests to confirm if a patient has an IgE-mediated sensitivity to these feathers. If an allergy is confirmed and symptoms are severe, the extract is used in allergen immunotherapy (allergy shots) to desensitize the patient over time. This process involves regular injections of increasing amounts of the extract to help the immune system build tolerance. It is particularly useful for patients with allergic rhinitis or asthma triggered by birds or down bedding.
What are the most common side effects of Anas Platyrhynchos Feather?
The most common side effects are localized to the site of the injection or skin test. Patients frequently experience redness, itching, and swelling (a wheal) where the extract was applied or injected. These local reactions are usually mild and resolve within a few hours to a day. Some patients may also experience a 'large local reaction,' where the swelling is several inches wide. While these are uncomfortable, they are not typically dangerous, though they should be reported to your doctor before your next dose.
Can I drink alcohol while taking Anas Platyrhynchos Feather?
It is strongly recommended to avoid alcohol on the days you receive an Anas Platyrhynchos Feather injection. Alcohol causes blood vessels to dilate (expand), which can increase the rate at which the allergen is absorbed from the injection site into your bloodstream. This increased absorption rate significantly raises the risk of a systemic allergic reaction or anaphylaxis. Furthermore, alcohol can mask early symptoms of an allergic reaction, making it harder for you or your doctor to identify a problem. Always wait at least 24 hours after your injection before consuming alcohol.
Is Anas Platyrhynchos Feather safe during pregnancy?
Anas Platyrhynchos Feather is generally considered safe to continue during pregnancy if you are already on a stable maintenance dose and have not had recent reactions. However, doctors almost never start the 'build-up' phase of immunotherapy during pregnancy because the risk of a severe reaction (anaphylaxis) could be dangerous for the baby. Anaphylaxis can cause a sudden drop in the mother's blood pressure, leading to reduced oxygen flow to the fetus. If you become pregnant while receiving allergy shots, notify your allergist immediately so they can adjust your treatment plan.
How long does it take for Anas Platyrhynchos Feather to work?
The timeline for effectiveness depends on the use case. For diagnostic skin testing, the results are visible within 15 to 20 minutes. For therapeutic immunotherapy, the process is much slower. Most patients begin to notice a reduction in their allergy symptoms during the first 6 months of treatment as they reach higher doses. However, the full clinical benefit usually requires 12 to 24 months of consistent injections. A full course of treatment typically lasts 3 to 5 years to ensure long-lasting immunity after the shots are stopped.
Can I stop taking Anas Platyrhynchos Feather suddenly?
Yes, you can stop taking Anas Platyrhynchos Feather immunotherapy suddenly without experiencing withdrawal symptoms, as it is not an addictive or physiologically dependent medication. However, stopping treatment prematurely—especially before the 3-year mark—often results in the return of your original allergy symptoms. If you need to stop treatment due to side effects, financial reasons, or a move, discuss a plan with your allergist. They can advise you on whether your immune system has had enough exposure to maintain some level of tolerance.
What should I do if I miss a dose of Anas Platyrhynchos Feather?
If you miss a scheduled immunotherapy injection, you should contact your allergy clinic to reschedule as soon as possible. Do not simply wait for your next regularly scheduled appointment without calling. If too much time passes between doses, your sensitivity to the extract may increase, making your next injection potentially dangerous. Depending on how many weeks you have missed, your doctor may need to repeat your last dose or even reduce the dose slightly to ensure your safety when you resume treatment.
Does Anas Platyrhynchos Feather cause weight gain?
There is no clinical evidence to suggest that Anas Platyrhynchos Feather allergenic extracts cause weight gain. The extract consists of proteins and a small amount of liquid (aqueous or glycerinated), which does not affect the body's metabolism or appetite. If you experience weight gain while on immunotherapy, it is likely due to other factors, such as the use of oral corticosteroids for asthma or other unrelated lifestyle changes. Always discuss unexplained weight changes with your primary care physician.
Can Anas Platyrhynchos Feather be taken with other medications?
Anas Platyrhynchos Feather can be taken alongside most medications, but there are critical exceptions. You must inform your doctor if you are taking beta-blockers (often used for blood pressure or heart issues), as these can make emergency treatment for an allergic reaction less effective. Additionally, you must stop taking antihistamines several days before a skin test, as they will block the test results. Most other daily medications for chronic conditions do not interact with the extract itself but should still be disclosed to your allergist.
Is Anas Platyrhynchos Feather available as a generic?
Allergenic extracts like Anas Platyrhynchos Feather are biological products rather than simple drugs, so the term 'generic' is not used in the same way. However, various manufacturers produce Mallard duck feather extracts that are considered therapeutically equivalent. These are usually referred to by their common name or the manufacturer's brand. Because these are non-standardized extracts, your allergist will typically stick with the same manufacturer's product throughout your treatment to ensure the protein concentration remains consistent.
Similar Medications
Other drugs with the same active ingredient (Anas Platyrhynchos Feather)
These reactions are often referred to as 'systemic' but are not life-threatening.
Generalized Urticaria: Hives appearing on parts of the body away from the injection site.
Allergic Rhinitis Symptoms: Increased sneezing, nasal congestion, or runny nose shortly after the injection.
Mild Wheezing: Patients with a history of asthma may experience a slight tightening of the chest.
Fatigue: Some patients report feeling unusually tired for several hours after their immunotherapy session.
Rare Side Effects (less than 1 in 100)
Persistent Granuloma: A small, hard knot under the skin at the injection site that may last for weeks or months.
Late-Phase Reactions: Swelling and pain that begin 6 to 12 hours after the injection, rather than immediately.
Vasovagal Reaction: Fainting or lightheadedness due to the needle stick itself, rather than the extract.
Serious Side Effects — Seek Immediate Medical Attention
> Warning: Stop taking Anas Platyrhynchos Feather and call your doctor immediately or seek emergency care if you experience any of these symptoms of anaphylaxis.
Angioedema: Significant swelling of the lips, face, tongue, or throat that can obstruct the airway.
Dyspnea and Bronchospasm: Severe difficulty breathing, gasping for air, or a high-pitched whistling sound when breathing.
Hypotension: A sudden drop in blood pressure, which may feel like extreme dizziness, confusion, or 'fainting.'
Cyanosis: A bluish tint to the lips or fingernails, indicating a lack of oxygen.
Loss of Consciousness: Fainting or 'passing out' following an injection.
Cardiac Arrest: In extremely rare cases, a severe allergic reaction can lead to the heart stopping.
Long-Term Side Effects
There are no known long-term 'toxic' effects of Anas Platyrhynchos Feather extract, as it is a protein-based biological substance. The primary long-term risk is the development of new sensitivities or the persistence of local reactions. Some studies have investigated whether long-term immunotherapy could lead to autoimmune issues, but current evidence from the American Academy of Allergy, Asthma & Immunology (AAAAI) suggests that immunotherapy is generally safe for long-term use (3-5 years) and does not increase the risk of autoimmune disease.
Black Box Warnings
While Anas Platyrhynchos Feather specifically may not have a unique black box warning, the entire class of allergenic extracts carries a significant warning regarding anaphylaxis.
Summary of Class Warning:
Allergenic extracts can cause severe life-threatening systemic reactions, including anaphylaxis and death.
Patients must be observed for at least 30 minutes in a medical facility after administration.
Immunotherapy should not be initiated in patients with unstable or severe asthma.
Caution is required in patients taking beta-blockers, as they may be unresponsive to epinephrine.
Report any unusual symptoms to your healthcare provider. Even a 'large' local reaction should be reported, as it may predict a future systemic reaction.
Asthma Status: If a patient is experiencing an asthma flare-up or if their FEV1 (Forced Expiratory Volume) is significantly below their baseline, the injection should be withheld. Uncontrolled asthma is a major risk factor for fatal reactions to immunotherapy.
Injection Technique: The extract must be given subcutaneously. Accidental intravenous injection can lead to immediate and severe systemic reactions because the allergen enters the bloodstream all at once.
Cardiovascular Disease: Patients with significant heart disease may not be able to tolerate the physiological stress of a systemic reaction or the effects of the epinephrine required to treat it.
Beta-Blocker Use: Patients taking beta-blockers (e.g., metoprolol, propranolol) are at higher risk because these drugs block the receptors that epinephrine needs to work, making a severe reaction much harder to treat.
Monitoring Requirements
Regular monitoring is essential for patients receiving Anas Platyrhynchos Feather immunotherapy:
Symptom Review: Before every injection, the nurse or doctor must ask if the patient had a reaction to the previous shot.
Peak Flow/Spirometry: For asthmatic patients, a peak flow meter or spirometry may be used to ensure their lung function is stable before the injection.
Site Inspection: The injection site from the previous visit should be inspected for any lingering reactions.
Vital Signs: In some cases, blood pressure and heart rate may be checked before and after the injection.
Driving and Operating Machinery
While the extract itself does not cause sedation, a systemic reaction or the administration of antihistamines (if needed for a reaction) can cause drowsiness. Patients should ensure they feel completely normal before driving away from the clinic after their 30-minute wait.
Alcohol Use
Alcohol should be avoided on the day of an immunotherapy injection. Alcohol can increase blood flow to the skin and potentially speed up the absorption of the allergen, increasing the risk of a systemic reaction. It can also mask the early symptoms of an allergic reaction.
Discontinuation
Immunotherapy is typically discontinued if:
1The patient experiences a life-threatening systemic reaction.
2The patient is consistently unable to tolerate even low doses during the build-up phase.
3The patient has completed 3-5 years of successful maintenance therapy and is now asymptomatic.
There is no 'withdrawal syndrome' associated with stopping allergenic extracts, but the patient's allergy symptoms may eventually return.
> Important: Discuss all your medical conditions with your healthcare provider before starting Anas Platyrhynchos Feather.
MAOIs (Monoamine Oxidase Inhibitors): These can potentiate the effect of epinephrine, leading to dangerously high blood pressure if an emergency occurs.
Tricyclic Antidepressants: Similar to MAOIs, these can interfere with the metabolism of emergency medications.
Moderate Interactions
Antihistamines: (e.g., Loratadine, Cetirizine). While not dangerous, these drugs MUST be stopped several days before diagnostic skin testing, as they will suppress the 'wheal and flare' response, leading to a false-negative result. They do not need to be stopped for immunotherapy injections.
Systemic Corticosteroids: High doses of oral steroids may suppress the immune response to the extract, potentially reducing the effectiveness of the immunotherapy or masking early warning signs of a reaction.
Food Interactions
Alcohol: As mentioned, alcohol can increase peripheral vasodilation, potentially accelerating the absorption of the subcutaneous extract and increasing the risk of a systemic reaction.
High-Protein Meals: There is no direct interaction, but patients are generally advised not to exercise vigorously or sit in a sauna/hot tub immediately after an injection, as increased body heat can speed up allergen absorption.
Herbal/Supplement Interactions
St. John’s Wort: May theoretically affect the metabolism of medications used to treat allergic reactions, though clinical data is sparse.
Ginkgo Biloba: Has anti-platelet effects and might theoretically complicate the management of a severe reaction, though this is not a standard contraindication.
Lab Test Interactions
Allergy Blood Tests (IgE/RAST): Anas Platyrhynchos Feather immunotherapy will eventually change the levels of IgE and IgG4 in the blood. This is an intended effect but should be noted when interpreting future allergy lab work.
Skin Tests: As noted, the extract itself is used for skin testing. Other unrelated skin tests should be performed on a different area of the body or at a different time to avoid interference.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking. Include over-the-counter cold medicines, which often contain antihistamines that can interfere with testing.
Inability to Communicate: Patients who cannot report early symptoms of a reaction (e.g., certain severe neurological conditions) are not candidates for SCIT.
Relative Contraindications
These conditions require a careful risk-benefit analysis by the allergist:
Autoimmune Diseases: There is a theoretical concern that stimulating the immune system could worsen conditions like Lupus or Rheumatoid Arthritis, though clinical evidence for this is weak.
Malignancy: Patients undergoing active chemotherapy or radiation may have unpredictable immune responses.
Beta-Blocker Therapy: As discussed, this makes treating a reaction difficult. Some doctors will require the patient to switch to a different blood pressure medication before starting allergy shots.
Pregnancy (Initiation): Immunotherapy is generally not started during pregnancy due to the risk of anaphylaxis causing fetal hypoxia (lack of oxygen).
Cross-Sensitivity
Patients allergic to Anas Platyrhynchos Feather may show cross-sensitivity to:
Other Bird Feathers: Geese, chickens, and turkeys often share similar protein structures.
Bird Dander: The skin scales of the bird.
Duck Meat: In rare cases (Bird-Egg Syndrome), though most feather-allergic patients can eat duck meat without issue because the proteins in feathers are different from those in muscle tissue.
> Important: Your healthcare provider will evaluate your complete medical history before prescribing Anas Platyrhynchos Feather.
Pediatric Use
Approved Age: While there is no strict lower age limit, it is rarely started in children under 5 because they may have difficulty cooperating with the 30-minute wait and may not be able to describe the 'itchy throat' or 'tight chest' that signals a reaction.
Growth Effects: There is no evidence that allergenic extracts affect growth or development in children.
Benefits: Early immunotherapy in children may prevent the development of asthma later in life, a concept known as the 'allergic march.'
Geriatric Use
In patients over 65, the decision to use Anas Platyrhynchos Feather extract is based on cardiovascular health. The risk of using epinephrine in an elderly patient with potential coronary artery disease must be weighed against the benefit of allergy relief. Pharmacokinetic changes in the elderly (reduced kidney or liver function) do not significantly impact the use of this biological product.
Renal Impairment
No dosage adjustment is necessary for patients with kidney disease. The clearance of these proteins is not dependent on renal filtration. However, if the patient is on dialysis, the timing of the injection should be discussed with the nephrologist.
Hepatic Impairment
No dosage adjustment is necessary for patients with liver disease. The liver does not play a primary role in the metabolism of subcutaneously administered allergenic proteins.
> Important: Special populations require individualized medical assessment. Always inform your allergist if your health status changes, such as becoming pregnant or being diagnosed with a heart condition.
Pharmacokinetics
| Parameter | Value |
|---|---|
| Bioavailability | N/A (Subcutaneous/Local) |
| Protein Binding | N/A (Proteins are the active agent) |
| Half-life | Variable (Proteolysis occurs over hours) |
| Metabolism | Proteolysis by tissue and plasma proteases |
| Excretion | Renal (as small peptides/amino acids) |
Chemical Information
Composition: A complex mixture of proteins, glycoproteins, and polysaccharides derived from the feathers of Anas platyrhynchos.
Molecular Weight: Ranges from 10 kDa to over 100 kDa for various allergenic fractions.
Solubility: Soluble in aqueous solutions and 50% glycerin.
Structure: Primarily composed of keratins and associated dander proteins.
Drug Class
Anas Platyrhynchos Feather is classified as a Non-Standardized Animal Feather Allergenic Extract. It is related to other avian extracts like Chicken Feather and Goose Feather. It is distinct from 'Standardized' extracts, which have a defined potency measured against a reference standard.