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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Non-Standardized Food Allergenic Extract [EPC]
Lactuca Virosa Whole is a non-standardized plant allergenic extract used primarily in the diagnosis and treatment of hypersensitivity to wild lettuce and related species within the Asteraceae family.
Name
Lactuca Virosa Whole
Raw Name
LACTUCA VIROSA WHOLE
Category
Non-Standardized Food Allergenic Extract [EPC]
Drug Count
3
Variant Count
3
Last Verified
February 17, 2026
About Lactuca Virosa Whole
Lactuca Virosa Whole is a non-standardized plant allergenic extract used primarily in the diagnosis and treatment of hypersensitivity to wild lettuce and related species within the Asteraceae family.
Detailed information about Lactuca Virosa Whole
References used for this content
This page is for informational purposes only and does not replace medical advice. Consult a qualified healthcare professional before using any medication containing Lactuca Virosa Whole.
Lactuca Virosa has a long history in traditional botanical medicine, where it was often referred to as 'opium lettuce' due to the sedative properties of its milky latex (lactucarium). However, it is critical to note that the FDA-approved clinical use of the 'Whole' extract is strictly limited to the field of allergy and immunology. The extract is used in skin prick testing (SPT) and subcutaneous immunotherapy (SCIT) for patients who demonstrate clinical sensitivity to the plant or its pollen. According to the FDA’s Center for Biologics Evaluation and Research (CBER), these extracts are derived from the whole plant to ensure a broad spectrum of potential allergens are represented, including proteins found in the leaves, stems, and reproductive structures.
When used as an allergenic extract, Lactuca Virosa Whole functions through the principles of immunology rather than traditional systemic pharmacology. For diagnostic purposes, when the extract is introduced into the skin via a prick or puncture, it interacts with specific IgE antibodies bound to the surface of mast cells. If the patient is sensitized to Lactuca Virosa, the allergens in the extract cross-link these IgE molecules, triggering mast cell degranulation. This release of inflammatory mediators—most notably histamine, leukotrienes, and prostaglandins—results in a localized 'wheal and flare' reaction (a raised bump surrounded by redness). This reaction allows the healthcare provider to confirm a Type I hypersensitivity.
In the context of immunotherapy (allergy shots), the mechanism involves the gradual induction of 'desensitization' or 'tolerance.' By administering increasing doses of the Lactuca Virosa Whole extract over time, the immune system undergoes several key changes:
As a biological allergenic extract consisting of complex proteins and polysaccharides, Lactuca Virosa Whole does not follow the standard ADME (Absorption, Distribution, Metabolism, and Excretion) path of small-molecule drugs.
Lactuca Virosa Whole is indicated for:
Lactuca Virosa Whole is typically available in the following formats:
> Important: Only your healthcare provider can determine if Lactuca Virosa Whole is right for your specific condition. The use of non-standardized extracts requires specialized training in allergy and immunology to ensure safety and efficacy.
Dosage for Lactuca Virosa Whole is highly individualized and must be determined by an allergist based on the patient's sensitivity levels. There is no 'standard' dose due to the non-standardized nature of the extract.
For skin prick testing (SPT), a single drop of the 1:10 or 1:20 w/v extract is applied to the skin (usually the forearm or back), followed by a puncture through the drop. A positive control (histamine) and negative control (saline/glycerin) are used concurrently. Results are read after 15 to 20 minutes.
Immunotherapy consists of two phases:
Lactuca Virosa Whole allergenic extracts are used in children; however, the starting dose may be even more conservative than in adults. Clinical studies suggest that immunotherapy is generally safe for children aged 5 and older. Use in children under age 5 requires careful risk-benefit analysis due to the difficulty of managing potential systemic reactions in very young patients.
No specific dosage adjustments are provided for renal impairment, as the systemic load of the extract is extremely low. However, patients with severe renal disease may be at higher risk if systemic anaphylaxis occurs.
No dosage adjustments are required for hepatic impairment.
Caution is advised in elderly patients, particularly those with underlying cardiovascular disease. The ability to tolerate a systemic reaction or the administration of emergency epinephrine may be compromised in this population.
In immunotherapy, if a dose is missed, the next dose may need to be reduced depending on the length of the delay.
An overdose of Lactuca Virosa Whole extract (giving too much allergen) can lead to a severe systemic reaction or anaphylaxis.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose without medical guidance. The precision of the dose is critical to preventing life-threatening allergic reactions.
Most patients undergoing testing or treatment with Lactuca Virosa Whole will experience localized reactions. These are generally considered expected and manageable.
> Warning: Stop taking Lactuca Virosa Whole and call your doctor immediately if you experience any of these. These symptoms may indicate the onset of anaphylaxis, a life-threatening emergency.
There are no known long-term 'toxic' side effects of Lactuca Virosa Whole extracts, as they are biological proteins. However, the primary long-term risk is the development of new sensitivities or the exacerbation of existing asthma if the immunotherapy is not managed correctly. Over several years, the desired long-term effect is a permanent reduction in allergic sensitivity.
While Lactuca Virosa Whole specifically may not have a unique black box warning, the entire class of allergenic extracts carries a standard FDA-mandated warning regarding the risk of severe systemic reactions.
Report any unusual symptoms to your healthcare provider immediately. Even a 'mild' systemic reaction (like itchy palms) can be a precursor to a more severe event.
Lactuca Virosa Whole is intended only for use by individuals with a confirmed clinical history of allergy. It is not a general-purpose medication and should never be self-administered. Because it contains active allergens, the primary safety concern is the induction of an allergic response that exceeds the body's ability to compensate.
No specific FDA black box warning exists uniquely for Lactuca virosa, but it falls under the general warning for all Non-Standardized Allergenic Extracts. This warning emphasizes that these products are not interchangeable with standardized extracts and that the risk of anaphylaxis is ever-present. Physicians must ensure that the patient is not currently experiencing an asthma flare-up before administering an injection, as this significantly increases the risk of a fatal reaction.
Lactuca Virosa Whole generally does not cause impairment. However, if a patient experiences a systemic reaction or receives epinephrine, they should not drive or operate machinery until they have been cleared by a medical professional and are fully recovered from the event.
While there is no direct chemical interaction between alcohol and Lactuca Virosa Whole, alcohol consumption can increase peripheral vasodilation. This may theoretically increase the rate of allergen absorption or worsen the symptoms of an allergic reaction. It is generally advised to avoid alcohol for several hours before and after an allergy injection.
If immunotherapy is discontinued, there is no 'withdrawal' syndrome. However, the patient's allergic symptoms will likely return to their baseline level over time. If a patient experiences a severe systemic reaction, the healthcare provider may decide to discontinue the treatment permanently.
> Important: Discuss all your medical conditions, especially respiratory or heart issues, with your healthcare provider before starting Lactuca Virosa Whole.
There are no absolute drug-drug contraindications that prevent the use of Lactuca Virosa Whole, but certain combinations make its use extremely dangerous:
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, especially those for blood pressure or allergies.
Lactuca Virosa Whole must NEVER be used in the following circumstances:
Patients who are allergic to Lactuca Virosa Whole are highly likely to be cross-sensitive to other members of the Compositae/Asteraceae family. This includes:
> Important: Your healthcare provider will evaluate your complete medical history and current respiratory health before prescribing or administering Lactuca Virosa Whole.
Lactuca Virosa Whole is categorized as Pregnancy Category C. There are no adequate and well-controlled studies in pregnant women. The primary risk during pregnancy is not the extract itself, but the potential for maternal anaphylaxis. Anaphylaxis can lead to maternal hypotension, which in turn causes placental hypoperfusion and fetal hypoxia (lack of oxygen to the baby).
It is not known whether the allergenic components of Lactuca Virosa Whole are excreted in human milk. However, since these are large proteins and the amount administered is very small, it is unlikely to affect the nursing infant. The decision to continue immunotherapy while breastfeeding should be made based on the mother's clinical need.
Allergenic extracts are widely used in the pediatric population. Clinical guidelines from the AAAAI suggest that children as young as 5 years old can safely undergo immunotherapy. For children under 5, the risk of a systemic reaction is harder to manage because the child may not be able to articulate early symptoms like an 'itchy throat' or 'impending doom.' Dosing must be extremely cautious in children with comorbid asthma.
In patients over 65, the use of Lactuca Virosa Whole requires careful screening for cardiovascular disease. The elderly are more likely to be taking medications (like beta-blockers) that complicate the treatment of an allergic reaction. Additionally, the immune system's ability to develop tolerance (immunosenescence) may be reduced in older age, potentially making the treatment less effective.
No specific studies have been conducted in patients with renal impairment. Because the extract is biological and administered in minute quantities, no dose adjustment is typically required. However, clinicians should monitor these patients closely for systemic stability.
There are no known issues with using allergenic extracts in patients with liver disease. The metabolism of these proteins is handled by general cellular proteases rather than the hepatic CYP450 system.
> Important: Special populations require individualized medical assessment. Always inform your allergist if you are pregnant, planning to become pregnant, or have underlying heart or lung conditions.
Lactuca Virosa Whole acts as an exogenous antigen. In diagnostic use, it facilitates the Type I Hypersensitivity reaction by binding to IgE on mast cells. In therapeutic use, it induces immunological tolerance. This is achieved by increasing the production of T-regulatory (Treg) cells, which secrete IL-10 and TGF-beta. These cytokines suppress the allergic Th2 response. Furthermore, the extract stimulates B-cells to produce IgG4, which acts as a 'blocking antibody' by intercepting the allergen before it can reach the IgE on mast cells.
| Parameter | Value |
|---|---|
| Bioavailability | N/A (Subcutaneous/Epicutaneous) |
| Protein Binding | Primarily binds to IgE and IgG antibodies |
| Half-life | Local tissue half-life: 2–48 hours |
| Tmax | 15–30 minutes (systemic absorption peak) |
| Metabolism | Proteolysis by extracellular enzymes |
| Excretion | Renal (as small peptide fragments) |
Lactuca Virosa Whole belongs to the class of Allergenic Extracts. It is specifically a non-standardized plant extract. Related medications include extracts for Ragweed (Ambrosia artemisiifolia), Mugwort (Artemisia vulgaris), and various grass pollens.
Common questions about Lactuca Virosa Whole
Lactuca Virosa Whole is primarily used as an allergenic extract for the diagnosis and treatment of allergies to wild lettuce and related plants. In a clinical setting, an allergist uses it to perform skin prick tests to see if a patient has an IgE-mediated sensitivity. If a sensitivity is confirmed, the extract can be used in 'allergy shots' (immunotherapy) to help the body build up a tolerance to the plant. This process involves giving the patient gradually increasing amounts of the extract over several months or years. It is not used for general pain relief or sedation in standardized medical practice.
The most common side effects are localized reactions at the site of the skin test or injection. These include redness, itching, and a raised bump known as a wheal, which typically appears within minutes. Some patients may also experience larger areas of swelling or 'late-phase' reactions that appear several hours later. These local reactions are usually mild and can be managed with cold compresses or over-the-counter antihistamines. However, any local reaction larger than the palm of your hand should be reported to your doctor.
It is generally recommended to avoid alcohol on the days you receive an injection of Lactuca Virosa Whole. Alcohol can cause blood vessels to dilate and may increase the rate at which the allergen is absorbed into your bloodstream, potentially increasing the risk of a systemic reaction. Furthermore, alcohol can mask the early symptoms of an allergic reaction or make them more difficult to treat. Always wait at least several hours after your injection before consuming alcohol. Discuss your lifestyle habits with your allergist for specific safety timing.
Lactuca Virosa Whole is generally not started during pregnancy because of the risk of anaphylaxis, which can be dangerous for both the mother and the developing fetus. However, if a woman is already on a stable maintenance dose of allergy shots and becomes pregnant, her doctor may decide to continue the treatment. The main concern is ensuring the mother does not have a severe reaction that could cut off oxygen to the baby. If you are undergoing immunotherapy and find out you are pregnant, notify your allergist immediately to discuss a safety plan.
When used for immunotherapy, Lactuca Virosa Whole is a long-term treatment and does not provide immediate relief. Most patients begin to notice a reduction in their allergy symptoms during the 'maintenance phase,' which usually occurs 6 to 12 months after starting the injections. For the best results, the treatment must be continued for 3 to 5 years to 'train' the immune system permanently. If you do not see improvement after a year of maintenance, your doctor may re-evaluate the treatment plan. Consistency is key to the success of this therapy.
Yes, you can stop taking Lactuca Virosa Whole injections suddenly without experiencing physical withdrawal symptoms, as it is not an addictive medication. However, stopping the treatment before the recommended 3-to-5-year course is finished will likely result in the return of your allergy symptoms. If you miss multiple doses, you cannot simply restart at the same level; your doctor will need to reduce the dose for safety. Always talk to your allergist before deciding to discontinue your immunotherapy. They can help you weigh the pros and cons of stopping early.
If you miss a scheduled allergy injection, contact your allergist's office as soon as possible to reschedule. Missing a dose can increase the risk of a reaction when you receive your next injection, especially if too much time has passed. Depending on how many weeks have been missed, your doctor may need to repeat the previous dose or even reduce the dose significantly to ensure your safety. Never try to 'double up' on doses to make up for a missed one. Your healthcare provider will determine the safest way to get you back on schedule.
There is no clinical evidence to suggest that Lactuca Virosa Whole allergenic extracts cause weight gain. The extract consists of small amounts of proteins and does not contain hormones or metabolic-altering chemicals that typically lead to weight changes. If you experience weight gain while on immunotherapy, it is likely due to other factors such as lifestyle changes or other medications you may be taking, such as oral steroids for asthma. Consult your primary care physician if you have concerns about unexplained weight changes. This medication is focused solely on the immune system.
Lactuca Virosa Whole can be taken with many medications, but some interactions are very important. Antihistamines will interfere with skin testing, so they must be stopped several days before a diagnostic test. More importantly, blood pressure medications called beta-blockers can make it very difficult to treat a severe allergic reaction if one occurs. You must provide your allergist with a complete list of all medications you are taking, including herbal supplements. This allows them to adjust your treatment plan to minimize the risk of dangerous drug interactions.
The concept of 'generic' vs. 'brand name' is slightly different for allergenic extracts. Lactuca Virosa Whole is a biological product produced by various specialized laboratories (such as Greer or HollisterStier). While different companies may produce the extract, they are all considered 'non-standardized extracts' rather than generics in the traditional sense. These products are not usually interchangeable, and allergists prefer to keep a patient on an extract from the same manufacturer throughout their treatment. Your insurance may cover the extract regardless of the specific laboratory that produced it.