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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]
Morus Alba Pollen is a non-standardized allergenic extract used for the diagnosis and treatment of White Mulberry-induced allergic rhinitis and conjunctivitis through allergen immunotherapy.
Name
Morus Alba Pollen
Raw Name
MORUS ALBA POLLEN
Category
Non-Standardized Pollen Allergenic Extract [EPC]
Drug Count
25
Variant Count
26
Last Verified
February 17, 2026
About Morus Alba Pollen
Morus Alba Pollen is a non-standardized allergenic extract used for the diagnosis and treatment of White Mulberry-induced allergic rhinitis and conjunctivitis through allergen immunotherapy.
Detailed information about Morus Alba Pollen
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Morus Alba Pollen.
The White Mulberry (Morus alba) is a deciduous tree native to East Asia but widely naturalized throughout North America, Europe, and the Middle East. Its pollen is a significant aeroallergen, particularly during the spring months when the tree undergoes anemophilous (wind-borne) pollination. Patients sensitized to this pollen often experience seasonal allergic rhinitis (hay fever) and allergic conjunctivitis. The FDA has historically approved these non-standardized extracts based on their long-standing use in clinical practice, though they are not assigned a specific 'potency unit' like standardized extracts (e.g., Ragweed or Grass extracts).
The mechanism of action for Morus Alba Pollen extract in immunotherapy is multifaceted and involves a fundamental shift in the patient's immune response. When a patient is allergic, their immune system incorrectly identifies the mulberry pollen proteins as a threat, leading to a Th2-biased (T-helper cell type 2) response. This results in the production of allergen-specific Immunoglobulin E (IgE) antibodies, which bind to mast cells and basophils. Upon subsequent exposure, the allergen cross-links these IgE antibodies, triggering the release of inflammatory mediators like histamine, leukotrienes, and prostaglandins.
Allergen immunotherapy works by inducing 'immunological tolerance.' By administering gradually increasing doses of the Morus Alba Pollen extract, the healthcare provider encourages the immune system to shift from a Th2-biased response to a Th1-biased response. This process involves several key molecular steps:
Unlike traditional small-molecule drugs, the pharmacokinetics of allergenic extracts like Morus Alba Pollen do not follow standard absorption, distribution, metabolism, and excretion (ADME) models. Because the extract is a mixture of various proteins, its 'fate' in the body is determined by proteolytic degradation and lymphatic processing.
The primary FDA-approved indications for Morus Alba Pollen extract include:
Morus Alba Pollen is primarily available in the following forms:
> Important: Only your healthcare provider can determine if Morus Alba Pollen is right for your specific condition. The complexity of allergen immunotherapy requires a specialist (Allergist/Immunologist) to ensure safety and efficacy.
Dosage for Morus Alba Pollen extract is highly individualized and must be determined by an allergist based on the patient's sensitivity level, as measured by skin testing or serum IgE levels. There is no 'standard' dose for non-standardized extracts; instead, the dose is measured in volume (mL) of a specific dilution.
During the initial phase, injections are typically given 1 to 3 times per week. The starting dose is usually a very dilute solution (e.g., 0.05 mL of a 1:100,000 w/v dilution). The dose is gradually increased at each visit—provided the patient tolerates the previous dose—until the 'Maintenance Dose' is reached. This phase usually lasts 3 to 6 months.
Once the maintenance dose is achieved (often 0.2 mL to 0.5 mL of a 1:20 or 1:10 w/v concentration), the frequency of injections is decreased. Maintenance injections are typically administered every 2 to 4 weeks. This phase generally continues for 3 to 5 years to ensure long-term desensitization.
Morus Alba Pollen extracts are used in children, generally starting at age 5. The dosing logic follows the same escalation and maintenance protocols used in adults. However, healthcare providers must exercise extreme caution in younger children who may not be able to articulate early symptoms of a systemic reaction. Clinical studies have shown that immunotherapy can be highly effective in children and may prevent the development of asthma (the 'Allergic March').
No dosage adjustments are typically required for patients with renal (kidney) impairment, as the proteins are not cleared via the kidneys in a manner that affects toxicity.
No dosage adjustments are required for patients with hepatic (liver) impairment.
While there is no specific age-based dosage adjustment, elderly patients must be screened for underlying cardiovascular disease. If an elderly patient is taking beta-blockers or has a history of severe heart disease, the risk of immunotherapy may outweigh the benefits, as these conditions complicate the treatment of an allergic reaction.
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 the dose based on how much time has passed (e.g., if more than 4 weeks have passed, a dose reduction is common). Never attempt to 'double up' on doses.
An 'overdose' in the context of allergenic extracts usually means the administration of a dose that exceeds the patient's current tolerance level. This can lead to severe local reactions or systemic anaphylaxis. Signs include hives, swelling of the throat, wheezing, and a drop in blood pressure. Treatment involves immediate administration of epinephrine and emergency supportive care.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance. The schedule is carefully designed to keep your immune system in a state of 'controlled exposure.'
The most frequent side effects associated with Morus Alba Pollen immunotherapy are local reactions at the site of the subcutaneous injection. These are generally considered a normal part of the body's response to the allergen.
These reactions are often termed 'Large Local Reactions' and may indicate that the dose is approaching the patient's limit of tolerance.
Rarely, patients may experience systemic symptoms that do not progress to full anaphylaxis but require monitoring.
> Warning: Stop taking Morus Alba Pollen and call your doctor immediately if you experience any of these symptoms of anaphylaxis.
Anaphylaxis is a life-threatening allergic reaction that can occur within minutes of an injection. Symptoms include:
Unlike many medications (such as corticosteroids), Morus Alba Pollen extracts do not typically cause long-term systemic side effects like bone loss, weight gain, or organ toxicity. The primary long-term 'effect' is the desired modification of the immune system. However, repeated injections over many years can occasionally cause localized 'granulomas' (small knots of tissue) or minor skin changes at the injection sites. There is no evidence that allergenic extracts increase the risk of autoimmune diseases or cancer.
Allergenic extracts, including Morus Alba Pollen, carry a Standardized FDA Black Box Warning regarding the risk of severe systemic reactions.
Report any unusual symptoms to your healthcare provider immediately, even if they occur several hours after you have left the clinic.
Morus Alba Pollen extract is a potent biological product that must be handled with extreme care. It is not a 'vaccine' in the traditional sense of preventing infection, but rather a tool for modifying the immune system's response to an environmental trigger. Patients must be healthy at the time of injection; if you have a fever, a severe cold, or an active asthma flare-up, your injection should be postponed.
No FDA black box warnings for Morus Alba Pollen specifically, however, it falls under the general class warning for all allergenic extracts. The warning emphasizes that 'Allergenic extracts can cause severe life-threatening systemic reactions, including anaphylaxis.' It mandates that patients be observed for 30 minutes and that the extract only be used by those experienced in managing such emergencies.
Unlike many drugs, Morus Alba Pollen does not require routine blood work (like liver or kidney function tests). Instead, monitoring is clinical:
Generally, Morus Alba Pollen does not cause sedation. However, if a patient experiences a systemic reaction or feels faint/dizzy after an injection, they should not drive. It is recommended to wait until the 30-minute observation period is over and you feel completely normal before operating a vehicle.
While there is no direct chemical interaction between alcohol and Morus Alba Pollen extract, alcohol consumption can cause vasodilation (widening of blood vessels). This may theoretically increase the rate of absorption of the allergen or worsen the symptoms of an allergic reaction. It is best to avoid alcohol for several hours before and after your injection.
If you decide to stop immunotherapy, there is no 'withdrawal syndrome.' However, stopping before the recommended 3-5 year course is completed often leads to a relapse of allergy symptoms. If you miss multiple doses, your doctor will need to 'taper' you back up to your maintenance dose rather than resuming at the full amount.
> Important: Discuss all your medical conditions with your healthcare provider before starting Morus Alba Pollen, especially any history of heart problems or breathing difficulties.
There are few absolute contraindications for Morus Alba Pollen, but certain medications make its use exceptionally dangerous:
For each major interaction, the primary concern is not the 'mixing' of chemicals in the blood, but rather the pharmacodynamic interaction where a drug either increases the risk of a reaction or decreases the effectiveness of the emergency treatment (epinephrine).
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking. A complete list is vital for your safety during immunotherapy.
Conditions where Morus Alba Pollen must NEVER be used include:
Conditions requiring careful risk-benefit analysis by an allergist:
Patients allergic to Morus Alba Pollen may show cross-sensitivity to other members of the Moraceae family, including:
If you have had a severe reaction to any of these substances, you must inform your doctor before starting Morus Alba Pollen immunotherapy.
> Important: Your healthcare provider will evaluate your complete medical history, including your current lung function and cardiovascular health, before prescribing Morus Alba Pollen.
FDA Pregnancy Category C. There are no adequate and well-controlled studies of Morus Alba Pollen extract in pregnant women.
Morus Alba Pollen extract consists of natural proteins that are broken down at the injection site. It is highly unlikely that these proteins would enter breast milk in any significant or intact form. Immunotherapy is generally considered safe for breastfeeding mothers. There are no known effects on the nursing infant's immune system from the mother's allergy shots.
Patients over the age of 65 may safely receive Morus Alba Pollen immunotherapy, but the decision must be tempered by their overall health.
There are no specific guidelines for renal impairment. Because the extract is composed of proteins that undergo local proteolysis rather than renal filtration, no dose adjustment is necessary for patients with chronic kidney disease or those on dialysis.
Liver function does not affect the metabolism or clearance of allergenic extracts. No dosage adjustments are required for patients with cirrhosis or other forms of hepatic impairment.
> Important: Special populations require individualized medical assessment. Always inform your allergist if you become pregnant or develop new health conditions during the course of your treatment.
Morus Alba Pollen extract acts as an immunomodulator. Its primary molecular target is the T-lymphocyte. In an allergic individual, mulberry pollen proteins are processed by antigen-presenting cells (APCs) and presented to Th2 cells. Immunotherapy changes this by:
| Parameter | Value |
|---|---|
| Bioavailability | N/A (Subcutaneous local uptake) |
| Protein Binding | N/A |
| Half-life | Minutes to hours (Proteolysis) |
| Tmax | 30-60 minutes (Peak local absorption) |
| Metabolism | Local and Lymphatic Proteases |
| Excretion | Cellular metabolic pathways |
Morus Alba Pollen is a Non-Standardized Pollen Allergenic Extract. It belongs to the broader therapeutic class of Allergen Immunotherapy Agents. Related medications include standardized extracts (like Timothy Grass or Short Ragweed) and other non-standardized tree pollens (like Oak, Birch, or Elm).
Common questions about Morus Alba Pollen
Morus Alba Pollen extract is primarily used for two clinical purposes: diagnosing and treating allergies to the White Mulberry tree. In diagnosis, a small amount is applied to the skin to see if a wheal-and-flare reaction occurs, confirming a Type I hypersensitivity. In treatment, it is used in allergen immunotherapy, commonly known as allergy shots. This involves regular injections of the extract to desensitize the immune system over time. The goal is to reduce symptoms of hay fever, such as sneezing, itchy eyes, and nasal congestion, in patients who are significantly affected by mulberry pollen during the spring season.
The most common side effects are local reactions at the site of the injection, which occur in a majority of patients at some point during their treatment. These include redness, swelling, itching, and a raised bump (wheal) that typically appears within minutes of the shot. Some patients may also experience 'large local reactions' where the swelling covers a significant portion of the arm. While these are bothersome, they are usually not dangerous. However, they must be reported to the doctor so the next dose can be adjusted if necessary to prevent a more serious systemic reaction.
It is generally advised to avoid alcohol on the days you receive your Morus Alba Pollen injections. Alcohol causes vasodilation, which is the widening of blood vessels, and this can potentially speed up the absorption of the allergen from the injection site into the bloodstream. This increased absorption rate could theoretically raise the risk of a systemic allergic reaction or anaphylaxis. Furthermore, alcohol can make it more difficult for you to recognize early symptoms of a reaction, such as lightheadedness or itching. For safety, wait at least several hours after your injection before consuming alcoholic beverages.
Morus Alba Pollen is generally not started during pregnancy because of the risk of a severe allergic reaction, which could be dangerous for both the mother and the developing fetus. However, if a woman is already on a stable maintenance dose and has shown good tolerance, many allergists will continue the treatment throughout pregnancy. The dose is typically kept the same and not increased until after delivery. There is no evidence that the pollen extract itself causes birth defects, but the risk lies in the potential for anaphylaxis. Always discuss your pregnancy status with your allergist immediately.
Allergen immunotherapy is not an immediate fix for allergy symptoms; it is a long-term disease-modifying treatment. Most patients begin to notice a reduction in their seasonal allergy symptoms after 6 to 12 months of consistent injections. The full benefit is typically realized after the patient has reached their maintenance dose and has been on it for at least one full pollen season. To achieve long-lasting results that persist even after the injections are stopped, a full course of 3 to 5 years of treatment is generally recommended by clinical guidelines.
Yes, you can stop taking Morus Alba Pollen injections suddenly without experiencing physical withdrawal symptoms like those associated with narcotics or antidepressants. However, stopping the treatment prematurely—especially before completing at least three years of therapy—greatly increases the likelihood that your allergy symptoms will return. If you stop because of a move or a change in insurance, it is better to try to find a new allergist who can continue your protocol. If you miss shots for several weeks, do not simply resume at your old dose, as your sensitivity may have increased.
If you miss a scheduled injection of Morus Alba Pollen, you should contact your allergist's office as soon as possible to reschedule. Do not attempt to make up for the missed dose by taking a higher dose later. The safety of immunotherapy depends on a strict schedule that keeps your immune system 'primed.' If too much time passes between doses (usually more than 7-14 days during the build-up phase), your doctor will likely need to reduce your next dose to ensure you do not have a reaction. Following the missed dose protocol provided by your clinic is essential for your safety.
There is no clinical evidence to suggest that Morus Alba Pollen extracts cause weight gain. Unlike oral corticosteroids (such as prednisone), which are sometimes used to treat severe allergies and are well-known for causing weight gain and metabolic changes, allergenic extracts are proteins that work specifically on the immune system's 'memory.' They do not affect your metabolism, appetite, or fat storage. If you experience weight changes while on immunotherapy, it is likely due to other factors or medications, and you should discuss this with your primary care physician.
Most medications, such as daily vitamins, birth control, and most blood pressure drugs, are safe to take with Morus Alba Pollen. However, there are critical exceptions. You must inform your doctor if you are taking beta-blockers, as these can make an allergic reaction much harder to treat. You should also mention if you are taking MAO inhibitors or certain antidepressants. While antihistamines can be taken, they might mask early symptoms of a reaction, so your doctor needs to know if you have taken them on the day of your shot. Always provide a full medication list to your allergist.
The concept of 'generic' vs. 'brand name' is different for allergenic extracts than for pills. Morus Alba Pollen is a biological product produced by several different laboratories (such as ALK, Greer, or HollisterStier). While the extracts are essentially the same active ingredient, they are not always interchangeable because the manufacturing processes and concentrations can vary slightly. Your allergist will usually stick with one manufacturer's extract for the duration of your treatment to ensure consistency in dosing. These are generally covered by insurance as 'allergen extracts' rather than by a specific brand name.