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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Non-Standardized Feather Allergenic Extract [EPC]
Gallus Gallus Feather is a non-standardized allergenic extract used primarily for the diagnosis and treatment of Type I hypersensitivity to chicken feathers, often associated with bird-egg syndrome.
Name
Gallus Gallus Feather
Raw Name
GALLUS GALLUS FEATHER
Category
Non-Standardized Feather Allergenic Extract [EPC]
Drug Count
7
Variant Count
8
Last Verified
February 17, 2026
About Gallus Gallus Feather
Gallus Gallus Feather is a non-standardized allergenic extract used primarily for the diagnosis and treatment of Type I hypersensitivity to chicken feathers, often associated with bird-egg syndrome.
Detailed information about Gallus Gallus Feather
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Gallus Gallus Feather.
According to the FDA-approved labeling for allergenic extracts, these products are indicated for patients who exhibit symptoms of allergic rhinitis (hay fever), allergic conjunctivitis (eye allergies), or allergic asthma when exposed to feather-derived aeroallergens. The use of Gallus Gallus Feather is particularly relevant in the context of 'bird-egg syndrome,' a clinical phenomenon where patients develop respiratory allergies to bird feathers and subsequently develop food allergies to egg yolks due to cross-reactive serum albumins.
The mechanism of action for Gallus Gallus Feather differs depending on whether it is being used for diagnosis or treatment. At the molecular level, the extract contains specific antigens—most notably serum albumin (Gal d 5)—that are recognized by the immune system of sensitized individuals.
Diagnostic Mechanism: When the extract is introduced into the skin during a skin prick test, it interacts with specific Immunoglobulin E (IgE) antibodies bound to the surface of mast cells (immune cells that release histamine). If the patient is sensitized, the allergens cross-link the IgE molecules, triggering mast cell degranulation. This release of histamine and other inflammatory mediators results in a 'wheal and flare' reaction (a raised bump and redness), which allows the healthcare provider to confirm the presence of a Type I hypersensitivity.
Therapeutic Mechanism (Immunotherapy): When used in immunotherapy, Gallus Gallus Feather works by inducing immunological tolerance. Repeated, escalating doses of the allergen shift the immune response from a Th2-dominated profile (associated with allergy and IgE production) to a Th1-dominated profile. This process involves the induction of regulatory T cells (Tregs) and the production of 'blocking antibodies' known as IgG4. Over time, this reduces the sensitivity of mast cells and basophils, leading to a significant reduction in clinical symptoms upon natural exposure to chicken feathers.
Unlike traditional small-molecule drugs, the pharmacokinetics of allergenic extracts like Gallus Gallus Feather are not characterized by traditional absorption, distribution, metabolism, and excretion (ADME) studies. Because these are biological proteins intended for local or subcutaneous administration, their 'movement' through the body is managed by the lymphatic system.
Gallus Gallus Feather is primarily used in two clinical scenarios:
Gallus Gallus Feather is typically available in the following forms:
> Important: Only your healthcare provider can determine if Gallus Gallus Feather is right for your specific condition. Testing and treatment must be conducted under the supervision of a qualified allergist or immunologist.
Dosage for Gallus Gallus Feather is highly individualized and is never based on a 'one size fits all' approach. Because the extract is non-standardized, potency is often expressed in Weight/Volume (W/V) ratios or Protein Nitrogen Units (PNU).
For skin prick testing, a single drop of the concentrated extract (typically 1:10 or 1:20 W/V) is applied to the skin. For intradermal testing, a much more dilute solution (often 1:1000 to 1:100 W/V) is injected into the dermis (the second layer of skin).
Immunotherapy follows a two-phase schedule:
Gallus Gallus Feather is generally considered safe for use in children; however, the decision to start immunotherapy in children under the age of 5 must be made carefully by a specialist. Dosing schedules for children are similar to those for adults but may involve more cautious increments during the build-up phase to monitor for systemic reactions.
No specific dosage adjustments are required for patients with kidney disease, as the extract is not cleared through the kidneys in a manner that would lead to toxicity. However, the patient's overall health must be stable before administration.
There are no known requirements for dose adjustment in patients with liver impairment.
Elderly patients (over 65) require careful assessment of their cardiovascular status. If an elderly patient has significant heart disease, they may be at higher risk if a systemic reaction occurs, as they may not tolerate the emergency use of epinephrine.
Gallus Gallus Feather extracts are administered exclusively by healthcare professionals in a clinical setting.
In the context of immunotherapy, consistency is vital. If a dose is missed during the build-up phase, the next dose may need to be reduced or the previous dose repeated to ensure safety. If a maintenance dose is missed by more than a few weeks, the allergist will determine a 'step-back' dose to prevent an adverse reaction when resuming treatment.
An 'overdose' in the context of allergenic extracts usually refers to the administration of a dose higher than the patient's current tolerance level. This can lead to a systemic allergic reaction or anaphylaxis.
Immediate administration of epinephrine (EpiPen) is the first-line treatment. Patients are typically required to remain in the clinic for at least 30 minutes after any injection to monitor for these signs.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or skip appointments without medical guidance.
The most frequent side effects associated with Gallus Gallus Feather extracts are local reactions at the site of administration. These are expected and usually indicate that the immune system is responding to the allergen.
While rare, systemic reactions can be life-threatening. These require immediate medical intervention.
> Warning: Stop taking Gallus Gallus Feather and call your doctor immediately if you experience any of these:
Long-term use of Gallus Gallus Feather in immunotherapy is generally well-tolerated. There is no evidence that it causes autoimmune diseases or chronic organ damage. The primary 'long-term' effect is the desired modulation of the immune system. However, some patients may develop a persistent sensitivity that requires a longer duration of maintenance therapy than the standard five years.
Gallus Gallus Feather, like all allergenic extracts, carries a significant warning regarding the risk of anaphylaxis.
Report any unusual symptoms to your healthcare provider immediately. Even a 'mild' systemic reaction (like itching palms) should be reported, as it may precede a more severe reaction in future doses.
Gallus Gallus Feather extract is a potent biological substance. It is not a medication you take at home; it must be administered in a facility equipped with emergency resuscitation equipment, including oxygen, intravenous fluids, and injectable epinephrine.
No FDA black box warnings are currently listed specifically for the 'Gallus Gallus Feather' name itself in the same way as high-risk pharmaceuticals, but it falls under the General Boxed Warning for Allergenic Extracts. This warning emphasizes that allergenic extracts are intended for use only by physicians experienced in administering these agents and that they can cause severe anaphylactic shock. Patients must be informed of the risks and monitored closely.
The primary risk is an IgE-mediated systemic reaction. This risk is highest during the build-up phase of immunotherapy or when switching to a new vial of extract (even if it is the same concentration), due to variations in non-standardized biological products.
Patients with asthma must have their condition well-controlled before receiving an injection. If a patient is experiencing an asthma flare-up or has a reduced Peak Expiratory Flow (PEF) on the day of the appointment, the injection should be deferred. Uncontrolled asthma is the single greatest risk factor for a fatal reaction to immunotherapy.
Patients with pre-existing heart disease (e.g., coronary artery disease, arrhythmias) are at higher risk if a systemic reaction occurs. The physiological stress of anaphylaxis, combined with the potential need for high-dose epinephrine, can strain the heart.
Most patients can drive themselves to and from their appointments. However, if a patient experiences a systemic reaction or receives epinephrine, they should not drive and should be monitored for several hours as a 'biphasic reaction' (a second wave of symptoms) can occur.
While there is no direct chemical interaction between alcohol and Gallus Gallus Feather, alcohol consumption can increase blood flow to the skin and potentially accelerate the absorption of the allergen, increasing the risk of a reaction. It is advised to avoid alcohol for several hours before and after an injection.
Discontinuing Gallus Gallus Feather immunotherapy does not require a tapering schedule. However, stopping prematurely will likely result in the return of allergy symptoms, as the immune system has not fully developed long-term tolerance.
> Important: Discuss all your medical conditions, especially respiratory and heart issues, with your healthcare provider before starting Gallus Gallus Feather.
There are no drugs that are strictly 'contraindicated' in the sense of a chemical incompatibility, but certain drugs make the use of Gallus Gallus Feather unacceptably dangerous:
There are no well-documented interactions with herbal supplements like St. John's Wort or Ginkgo Biloba; however, any supplement that has 'blood-thinning' properties or affects heart rate should be disclosed to the allergist.
Gallus Gallus Feather does not typically interfere with standard blood chemistry or hematology tests. However, it will directly affect:
For each major interaction, the mechanism usually involves either a pharmacodynamic interference with the body's emergency response systems or a masking of the diagnostic markers. Management always involves a thorough pre-treatment screening by the physician.
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including over-the-counter eye drops and nasal sprays.
Conditions where Gallus Gallus Feather must NEVER be used for immunotherapy include:
Conditions requiring careful risk-benefit analysis include:
Patients sensitive to Gallus Gallus Feather may also react to:
> Important: Your healthcare provider will evaluate your complete medical history and current health status before prescribing Gallus Gallus Feather.
Gallus Gallus Feather is classified as FDA Pregnancy Category C. This means that animal reproduction studies have not been conducted, and it is not known whether the extract can cause fetal harm. The primary concern during pregnancy is not the extract itself, but the potential for a systemic reaction (anaphylaxis) in the mother. If the mother's blood pressure drops or she experiences respiratory distress, it can lead to decreased oxygen delivery to the fetus, potentially causing fetal distress or death. Most allergists will continue maintenance doses during pregnancy but will not increase the dose or start a new patient on the therapy.
It is not known whether allergenic proteins from Gallus Gallus Feather are excreted in human milk. However, since these are large proteins that are processed locally by the immune system, it is highly unlikely that they would reach the milk in a form that would affect a nursing infant. Breastfeeding is generally not considered a contraindication for receiving allergy shots.
Allergy testing and immunotherapy with Gallus Gallus Feather are common in the pediatric population. Children as young as 3 or 4 can be tested, but immunotherapy is usually reserved for children who are old enough to communicate their symptoms (typically age 5 and older). Studies have shown that early immunotherapy can potentially prevent the 'allergic march'—the progression from allergic rhinitis to asthma.
Patients over the age of 65 may be at higher risk for complications. The decision to use Gallus Gallus Feather in this population must account for:
There are no specific guidelines for renal impairment. Since the extract is not a systemic drug cleared by the kidneys, standard dosing is typically used. However, if the patient is on dialysis, the timing of the injection should be discussed with the nephrologist.
Liver disease does not affect the processing of allergenic extracts. No dose adjustments are required for patients with various Child-Pugh classifications, provided they are otherwise hemodynamically stable.
> Important: Special populations require individualized medical assessment and often a more cautious approach to dosing and monitoring.
Gallus Gallus Feather contains several antigenic proteins, most notably Gal d 5 (Chicken Serum Albumin). In sensitized individuals, these proteins act as allergens.
| Parameter | Value |
|---|---|
| Bioavailability | N/A (Subcutaneous/Local) |
| Protein Binding | N/A (Biological Extract) |
| Half-life | Variable (Local tissue residence) |
| Tmax | 1-2 hours (Systemic absorption of small amounts) |
| Metabolism | Proteolysis by immune cells |
| Excretion | Minimal (Metabolic breakdown) |
Gallus Gallus Feather is classified as an Allergenic Extract. It belongs to the broader category of 'Biologicals' and the specific EPC (Established Pharmacologic Class) of Non-Standardized Feather Allergenic Extract. It is related to other avian extracts such as Duck Feather and Goose Feather extracts.
Common questions about Gallus Gallus Feather
Gallus Gallus Feather is primarily used by allergists to diagnose and treat allergies to chicken feathers and dander. For diagnosis, it is used in skin prick tests to see if a patient develops a localized allergic reaction. For treatment, it is used in allergen immunotherapy (allergy shots) to gradually desensitize the patient's immune system. This is particularly helpful for people with bird-egg syndrome or those who have respiratory symptoms when near birds or feather bedding. It is not used to treat the symptoms of an active allergy attack, but rather to prevent future reactions.
The most common side effects are localized to the area where the extract was injected or applied. Patients frequently experience redness, itching, and a small raised bump (wheal) at the site, which usually disappears within a few hours. Some people may develop a 'large local reaction,' where the swelling extends several inches across the arm. Systemic side effects like tiredness or mild nasal congestion can also occur but are less frequent. Because it is an allergen, there is always a small risk of a severe reaction, which is why it is only given in a doctor's office.
It is generally recommended to avoid alcohol for several hours before and after receiving an injection of Gallus Gallus Feather. Alcohol causes vasodilation, which means it widens your blood vessels and increases blood flow to the skin. This could potentially cause the allergen to be absorbed more quickly into your system, increasing the risk of a systemic allergic reaction. Additionally, alcohol can mask the early symptoms of an allergic reaction, making it harder for you or your doctor to identify a problem. Always follow the specific lifestyle advice provided by your immunology clinic.
Gallus Gallus Feather is generally not started during pregnancy because of the risk of anaphylaxis, which could be dangerous for both the mother and the baby. However, if a woman is already on a stable maintenance dose of immunotherapy and becomes pregnant, many doctors will continue the treatment at that same dose. The main concern is that a severe allergic reaction could cause a drop in blood pressure, reducing the oxygen supply to the fetus. You must inform your allergist immediately if you are pregnant or planning to become pregnant. They will perform a careful risk-benefit analysis for your specific case.
When used for diagnosis, Gallus Gallus Feather works almost immediately, with results visible within 15 to 20 minutes of a skin test. However, when used as a treatment (immunotherapy), it takes much longer to see a clinical benefit. Most patients begin to notice a reduction in their allergy symptoms during the first 3 to 6 months of the build-up phase. The full therapeutic effect is typically reached after about a year of consistent maintenance injections. For long-lasting results that continue even after the shots are stopped, a full course of 3 to 5 years is usually required.
Yes, you can stop Gallus Gallus Feather immunotherapy suddenly without experiencing physical withdrawal symptoms like you might with some other medications. However, stopping the treatment before the recommended 3-to-5-year course is finished usually means your allergy symptoms will eventually return. The immune system requires long-term, consistent exposure to the allergen to maintain its 'tolerance.' If you need to stop treatment due to side effects or lifestyle changes, discuss it with your doctor first. They can help you understand how stopping will affect your long-term allergy management.
If you miss an appointment for your Gallus Gallus Feather allergy shot, you should contact your allergist's office as soon as possible to reschedule. Do not simply wait until your next scheduled visit. Depending on how long it has been since your last shot, your doctor may need to adjust your dose. If you are in the build-up phase, missing a dose often requires 'stepping back' to a lower concentration to ensure safety. Consistency is the most important factor in making immunotherapy successful and safe, so try to stick to your schedule as closely as possible.
There is no scientific evidence to suggest that Gallus Gallus Feather allergenic extracts cause weight gain. Unlike systemic corticosteroids (like prednisone), which are sometimes used to treat severe allergies and can cause weight changes, allergenic extracts are biological proteins that work locally on the immune system. They do not affect your metabolism, appetite, or fat distribution. If you notice weight changes while undergoing immunotherapy, it is likely due to other factors, such as changes in your activity level, diet, or other medications you may be taking.
Gallus Gallus Feather can be taken alongside many common medications, but there are important exceptions. You must tell your doctor if you are taking beta-blockers, as these can make an allergic reaction much harder to treat. Other drugs like ACE inhibitors, MAOIs, and tricyclic antidepressants can also interact with the way your body handles an allergic reaction or the emergency medicine (epinephrine) used to treat it. Antihistamines won't make the shots dangerous, but they will interfere with the accuracy of skin testing, so they must be stopped several days before a test.
The concept of 'generic' vs. 'brand name' is a bit different for allergenic extracts like Gallus Gallus Feather. These products are biological extracts produced by several different specialized laboratories (such as ALK, Greer, or HollisterStier). While they all contain chicken feather proteins, they are 'non-standardized,' meaning the exact concentration of specific proteins can vary between manufacturers. Therefore, they are not considered interchangeable generics in the same way a generic ibuprofen tablet is. Your allergist will usually stick with one manufacturer's product for your entire course of treatment to ensure consistency.