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Medical Disclaimer: This information is for educational purposes only and is not a substitute for professional medical advice.
Standardized Chemical Allergen [EPC]
Lactuca Virosa, commonly known as Wild Lettuce, is utilized in clinical settings primarily as a standardized chemical allergen and plant extract. It belongs to the Asteraceae family and is recognized for its sesquiterpene lactone content, which contributes to its pharmacological profile.
Name
Lactuca Virosa
Raw Name
LACTUCA VIROSA
Category
Standardized Chemical Allergen [EPC]
Drug Count
12
Variant Count
20
Last Verified
February 17, 2026
About Lactuca Virosa
Lactuca Virosa, commonly known as Wild Lettuce, is utilized in clinical settings primarily as a standardized chemical allergen and plant extract. It belongs to the Asteraceae family and is recognized for its sesquiterpene lactone content, which contributes to its pharmacological profile.
Detailed information about Lactuca Virosa
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.
Lactuca Virosa, colloquially referred to as 'Wild Lettuce' or 'Bitter Lettuce,' is a biennial plant belonging to the Asteraceae family. In the context of modern clinical pharmacology, Lactuca Virosa is primarily classified as a Standardized Chemical Allergen [EPC], a Non-Standardized Plant Allergenic Extract [EPC], and a Non-Standardized Food Allergenic Extract [EPC]. While it has a long-standing history in traditional ethnobotanical practices, its contemporary medical utility is largely centered around diagnostic immunology and the identification of Type I hypersensitivity reactions. The plant is native to central and southern Europe but has become naturalized in many parts of North America and Australia.
From a pharmacological perspective, Lactuca Virosa belongs to a class of substances that contain potent sesquiterpene lactones, specifically lactucin and lactucopicrin. These compounds are found within the milky latex (lactucarium) that exudes from the plant when it is injured. Historically, this substance was dubbed 'lettuce opium' due to its purported sedative and analgesic properties, although it contains no actual opiates. The FDA monitors the use of allergenic extracts derived from Lactuca Virosa to ensure they meet specific safety and potency standards for diagnostic testing. Patients should understand that while the term 'allergen' is used, in a clinical setting, this refers to its use in identifying patients who may have sensitivities to this or related plant species.
The mechanism of action for Lactuca Virosa depends heavily on its application. When used as a Standardized Chemical Allergen, it works by eliciting a controlled immunological response. In diagnostic skin testing (such as the skin prick test), the extract is introduced into the epidermis. If the patient has pre-existing IgE antibodies specific to the proteins or chemicals in Lactuca Virosa, a localized inflammatory cascade is triggered. This involves the degranulation of mast cells and the release of histamine and other mediators, resulting in a 'wheal and flare' reaction. This allows healthcare providers to confirm a diagnosis of environmental or occupational allergy.
At a molecular level, the primary active constituents, lactucin and lactucopicrin, have been studied for their effects on the central nervous system. Research suggests these compounds may act as adenosine receptor agonists or potentially modulate pathways involved in antinociception (pain relief). Unlike traditional opioids that target mu-opioid receptors, the sesquiterpene lactones in Lactuca Virosa appear to exert their effects through non-narcotic pathways, although the exact molecular targets in humans remain a subject of ongoing clinical investigation.
The pharmacokinetics of Lactuca Virosa are not as extensively documented as synthetic pharmaceuticals, particularly when used as a localized allergenic extract. However, when systemic exposure occurs, the following parameters are generally observed:
The primary FDA-recognized and clinical uses for Lactuca Virosa include:
Lactuca Virosa is available in several specialized forms, primarily for diagnostic or homeopathic use:
> Important: Only your healthcare provider can determine if Lactuca Virosa is right for your specific condition. Diagnostic use must be performed by a qualified allergist or immunologist.
It is important to note that Lactuca Virosa is classified under several Established Pharmacologic Classes (EPC). These include its role as a plant and food allergenic extract. Interestingly, in some regulatory databases, it is cross-referenced with 'Copper-containing Intrauterine Device [EPC]'; however, this is typically a result of database mapping for standardized allergen testing kits that may include various metal and plant allergens. Patients should focus on its primary role as a botanical allergen unless otherwise specified by a specialist.
Dosage for Lactuca Virosa is not standardized in the same way as conventional medications like ibuprofen or lisinopril. Its use is highly dependent on the form and the intent of the administration.
For diagnostic skin testing, the dosage is measured in Protein Nitrogen Units (PNU) or weight/volume (w/v) concentrations. A typical skin prick test involves the application of a single drop of a 1:10 or 1:20 w/v extract to the skin, followed by a superficial puncture. The concentration is determined by the allergist based on the patient's sensitivity history.
In homeopathic medicine, doses are highly diluted (e.g., 3 to 5 pellets of a 30C dilution). In traditional herbal preparations, which are not recommended by clinical pharmacologists due to lack of standardization, historical doses of 'lactucarium' ranged from 100 mg to 500 mg. However, these doses are not validated for safety in 2026 clinical standards.
Lactuca Virosa is generally not approved for systemic use in pediatric populations. For diagnostic allergy testing in children, the procedure is similar to adults but requires extreme caution. The concentration of the extract may be further diluted to minimize the risk of a systemic allergic reaction (anaphylaxis). Pediatric testing should only be conducted in facilities equipped with emergency resuscitation equipment.
There are no specific dosage adjustment guidelines for Lactuca Virosa extracts in patients with kidney disease, as systemic absorption during skin testing is minimal. However, for any systemic exposure, reduced renal clearance may theoretically prolong the presence of metabolites.
Patients with significant liver dysfunction should be monitored closely if systemic exposure occurs, as the metabolism of sesquiterpene lactones occurs primarily in the liver. There are no established dose-adjustment scales (e.g., Child-Pugh) for this substance.
Geriatric patients may have increased skin fragility, which can affect the interpretation of skin prick tests. Additionally, the sedative effects of systemic Lactuca Virosa may be more pronounced in the elderly, increasing the risk of falls or cognitive impairment.
Since Lactuca Virosa is typically administered on an as-needed basis for diagnostic purposes or in acute homeopathic settings, 'missing a dose' is generally not a clinical concern. If you miss a scheduled allergy testing appointment, contact your immunologist to reschedule. Do not attempt to 'double up' on any herbal preparations.
Signs of systemic overdose from Lactuca Virosa (particularly the concentrated latex) include:
In the event of a suspected overdose, especially if accidental ingestion occurs, contact a Poison Control Center immediately or seek emergency medical care. Treatment is primarily supportive, focusing on maintaining airway patency and cardiac monitoring.
> Important: Follow your healthcare provider's dosing instructions. Do not adjust your dose or use non-standardized herbal products without medical guidance.
When used as a diagnostic allergen, the most common side effects are localized to the site of administration:
If ingested systemically (herbal/traditional use), common side effects include:
> Warning: Stop using any form of Lactuca Virosa and call your doctor immediately if you experience any of these.
There is limited clinical data on the long-term use of Lactuca Virosa. However, chronic exposure to sesquiterpene lactones can lead to Sensitization. This means that over time, a person may become increasingly allergic to the plant, leading to more severe reactions upon subsequent exposures. There is also a theoretical risk of chronic lethargy and potential hepatotoxicity if large amounts of non-standardized extracts are consumed over months or years.
No FDA black box warnings for Lactuca Virosa. Unlike many potent pharmaceuticals, Lactuca Virosa does not currently carry a boxed warning. However, this does not imply that the substance is without risk; it reflects its primary use as a diagnostic tool rather than a chronic therapeutic agent.
Report any unusual symptoms or persistent side effects to your healthcare provider. You may also report side effects to the FDA at 1-800-FDA-1088.
Lactuca Virosa should be handled with care, particularly by individuals with known allergies to the Asteraceae/Compositae family (e.g., ragweed, daisies, marigolds, or chrysanthemums). The primary safety concern is the potential for severe allergic reactions. Furthermore, because it possesses sedative properties, it should never be combined with other CNS depressants without explicit medical supervision.
No FDA black box warnings for Lactuca Virosa.
There is a significant risk of cross-reactivity. If you are allergic to common weeds or flowers in the sunflower family, you are at a higher risk of a severe reaction to Lactuca Virosa. Diagnostic testing should always be performed in a clinical setting where epinephrine and oxygen are readily available.
Lactuca Virosa contains compounds that may exert mild anticholinergic activity. This can be dangerous for patients with:
While not directly linked to suicidality, the sedative and potentially hallucinogenic effects of high-dose Lactuca Virosa can exacerbate underlying psychiatric conditions or cause significant mood alterations. Patients with a history of depression or psychosis should use extreme caution.
For patients undergoing diagnostic testing with Lactuca Virosa extracts, monitoring requirements include:
Lactuca Virosa can cause significant somnolence (sleepiness) and blurred vision. Do not drive, operate heavy machinery, or engage in hazardous activities until you know how this substance affects you. The sedative effect may last for several hours after exposure.
Alcohol significantly potentiates the sedative effects of Lactuca Virosa. Combining the two can lead to profound respiratory depression, extreme dizziness, and an increased risk of accidents. It is strongly advised to avoid alcohol while using any systemic form of this substance.
For diagnostic use, there is no 'discontinuation' protocol. For those using homeopathic or herbal preparations, there is no known withdrawal syndrome; however, it is recommended to taper off any sedative substance to avoid 'rebound' insomnia or anxiety. Always consult your doctor before stopping a treatment regimen.
> Important: Discuss all your medical conditions, especially any history of allergies or glaucoma, with your healthcare provider before starting Lactuca Virosa.
CNS Depressants (Strong): Medications such as sodium oxybate or high-dose barbiturates should never be used with systemic Lactuca Virosa. The combination can lead to life-threatening respiratory depression and coma.
Most interactions with Lactuca Virosa are pharmacodynamic, meaning the drugs act on the same systems (like the CNS) to produce an additive effect. Some interactions may be pharmacokinetic, where one substance interferes with the liver enzymes (CYP450) responsible for breaking down the other.
If you must use a medication that interacts with Lactuca Virosa, your doctor may recommend:
> Important: Tell your doctor about ALL medications, supplements, and herbal products you are taking, including over-the-counter cold medicines.
Lactuca Virosa must NEVER be used in the following circumstances:
Healthcare providers will perform a careful risk-benefit analysis in patients with:
Patients should be aware of cross-sensitivity with the following:
If you have had a reaction to any of these herbal products, you are likely to have a reaction to Lactuca Virosa.
> Important: Your healthcare provider will evaluate your complete medical history, including any history of eye pain or urinary issues, before prescribing or using Lactuca Virosa.
There are no adequate and well-controlled studies of Lactuca Virosa in pregnant women. Animal reproduction studies have not been conducted. It is unknown whether the sesquiterpene lactones can cross the placenta or cause fetal harm. Due to its potential effects on the central nervous system and the lack of safety data, the use of Lactuca Virosa (especially systemic forms) is not recommended during pregnancy. Diagnostic testing should be postponed until after delivery unless the information is critical for managing a severe allergic condition.
It is not known whether the constituents of Lactuca Virosa are excreted in human milk. Many low-molecular-weight lipophilic compounds do pass into breast milk. Because of the potential for sedation in the nursing infant, breastfeeding mothers should avoid using this substance. If a mother must undergo diagnostic testing, she should discuss with her doctor whether to 'pump and dump' for a period of 24 hours following the test.
Safety and effectiveness in pediatric patients have not been established. Children may be more sensitive to the anticholinergic and sedative effects of Wild Lettuce. In particular, the risk of accidental ingestion of concentrated extracts or tinctures poses a significant poisoning hazard. Diagnostic use in children must be strictly supervised by a pediatric allergist.
Clinical studies of Lactuca Virosa did not include sufficient numbers of subjects aged 65 and over to determine whether they respond differently from younger subjects. However, geriatric patients are generally more susceptible to:
Dosage for elderly patients should be approached with extreme caution, starting at the lowest possible concentration for diagnostic tests.
In patients with a GFR (Glomerular Filtration Rate) below 30 mL/min, the excretion of Lactuca Virosa metabolites may be significantly delayed. While not a contraindication for a single skin test, chronic or systemic use should be avoided in this population. It is not known if Lactuca Virosa is dialyzable.
Since the liver is the presumed site of metabolism for sesquiterpene lactones, patients with cirrhosis or hepatitis (Child-Pugh Class B or C) may experience prolonged and intensified effects. Close monitoring of liver enzymes is recommended if systemic exposure occurs.
> Important: Special populations require individualized medical assessment. Always inform your doctor if you are pregnant, planning to become pregnant, or are currently breastfeeding.
Lactuca Virosa exerts its effects through a complex interplay of secondary metabolites. The primary active compounds are lactucin, lactucopicrin, and 11β,13-dihydrolactucin. These are sesquiterpene lactones of the guaianolide type.
| Parameter | Value |
|---|---|
| Bioavailability | Variable (Estimated 20-40% oral) |
| Protein Binding | Unknown (Predicted Moderate) |
| Half-life | 2–5 hours (Estimated) |
| Tmax | 1–2 hours |
| Metabolism | Hepatic (Phase I & II) |
| Excretion | Renal (>70%), Fecal (<30%) |
Lactuca Virosa is classified as a Standardized Chemical Allergen. It is grouped with other botanical allergens like Ambrosia artemisiifolia (Ragweed) and Artemisia vulgaris (Mugwort). Within the therapeutic landscape, it is considered a diagnostic aid rather than a primary treatment modality.
Medications containing this ingredient
Common questions about Lactuca Virosa
In modern clinical practice, Lactuca Virosa is primarily used as a standardized allergenic extract for diagnostic purposes, such as skin prick testing to identify plant allergies. Historically, it was used in traditional medicine as a mild sedative and pain reliever, often called 'wild lettuce' or 'lettuce opium.' However, it is not FDA-approved for treating pain, anxiety, or insomnia, and its use for these conditions is considered off-label and lacks rigorous scientific validation. Most healthcare providers use it strictly within the field of immunology to help patients manage environmental sensitivities. Always consult a specialist before using any form of this plant for therapeutic reasons.
The most common side effects of Lactuca Virosa depend on how it is administered. When used in allergy testing, patients frequently experience localized itching, redness, and a raised bump (wheal) at the site of the skin prick. If taken systemically as an herbal supplement, common side effects include significant drowsiness, a bitter taste in the mouth, and mild dizziness. Some individuals may also experience dry mouth or slightly blurred vision due to its mild anticholinergic properties. These effects are usually temporary but can be bothersome; if they persist, you should contact your healthcare provider immediately.
No, you should strictly avoid drinking alcohol while using any systemic form of Lactuca Virosa. Both alcohol and the active compounds in Wild Lettuce (lactucin and lactucopicrin) act as central nervous system depressants. When taken together, they can cause an additive effect that leads to dangerous levels of sedation, respiratory depression, and impaired motor skills. This combination significantly increases the risk of accidents, falls, and severe lethargy. Even small amounts of alcohol can interact poorly with this substance, so it is best to wait until the herb has completely left your system before consuming alcohol.
Lactuca Virosa is generally not recommended for use during pregnancy because there is insufficient clinical data to confirm its safety for the developing fetus. There are no formal FDA pregnancy category ratings for this botanical, and its potential to cross the placenta or affect fetal development is unknown. Because it can cause sedation and has mild anticholinergic effects, it could theoretically interfere with maternal or fetal well-being. Pregnant women should avoid herbal preparations of Wild Lettuce and should only undergo diagnostic allergy testing if their doctor determines the benefits clearly outweigh the risks. Always discuss any supplements or diagnostic tests with your obstetrician.
The time it takes for Lactuca Virosa to work depends on the intended effect. For diagnostic allergy testing, a skin reaction (if the patient is allergic) typically appears within 15 to 20 minutes of the skin prick. If used systemically in an herbal or homeopathic form for its sedative properties, the effects are usually felt within 30 to 60 minutes after ingestion. The peak effect generally occurs around 1 to 2 hours after administration. Because the onset of sedation can be unpredictable, you should not engage in activities requiring alertness immediately after taking it.
Yes, you can generally stop taking Lactuca Virosa suddenly, as it is not known to cause physical dependence or a traditional withdrawal syndrome when used occasionally. However, if you have been using it regularly for its sedative effects, stopping abruptly might lead to a temporary return of insomnia or mild anxiety. It is always a good practice to consult with a healthcare professional before discontinuing any supplement you have used long-term. For diagnostic uses, there is no concern with stopping, as it is typically a one-time or infrequent procedure. Your doctor can help you transition to more standardized treatments if needed.
If you miss a dose of Lactuca Virosa, you should simply skip the missed dose and return to your regular schedule if you are using it under a provider's guidance. Do not take two doses at once to make up for the one you missed, as this can increase the risk of side effects like extreme sleepiness or dry mouth. Since this substance is often used on an as-needed basis rather than for chronic disease management, a missed dose is rarely a cause for clinical concern. If you miss an appointment for diagnostic allergy testing, simply call your doctor's office to reschedule. Always follow the specific instructions provided by your healthcare team.
There is currently no clinical evidence to suggest that Lactuca Virosa causes weight gain. It is not known to affect metabolic rate, insulin sensitivity, or appetite in a way that would lead to significant changes in body weight. Most side effects are related to the central nervous system (like sedation) or the immune system (like allergic reactions). If you notice unexplained weight changes while using any new supplement, it is important to discuss this with your doctor, as it may be related to an underlying condition or an interaction with another medication. Maintaining a balanced diet and exercise remains the primary way to manage weight.
Lactuca Virosa can interact with several types of medications, particularly those that also cause sedation. You should be especially cautious if you are taking benzodiazepines, sleep aids, opioid pain relievers, or certain antidepressants, as the combination can lead to excessive drowsiness and impaired coordination. Additionally, because it may have mild anticholinergic effects, it could interact with medications for overactive bladder or glaucoma. It is vital to provide your healthcare provider with a complete list of all prescriptions, over-the-counter drugs, and herbal supplements you are taking to ensure there are no dangerous interactions. Your pharmacist can also help check for potential drug-herb conflicts.
Lactuca Virosa is a natural botanical substance, so the term 'generic' does not apply in the same way it does to synthetic drugs like atorvastatin. However, it is available from many different manufacturers as a non-branded herbal supplement, tincture, or homeopathic remedy. For diagnostic use, various laboratory supply companies produce standardized extracts. While these products contain the same active ingredient, they are not always interchangeable because the concentration and purity can vary significantly between brands. For medical purposes, it is best to use a product that has been recommended or provided by a licensed healthcare professional to ensure quality and safety.