IngredientsSabadilla is the common name applied to the plant Schoenocaulon officinale (A. Gray), as well as to the insecticidal and medicinal preparations derived from its seeds. The plant carries an extensive synonymy reflecting centuries of botanical reclassification: it has been described under the names Asagraea officinalis Lindley, Veratrum officinale Schlechtendal, Helonias officinalis Don, Veratrum sabadilla Retz, and Sabadilla officinarum Brant. It is a species of flowering plant in the genus Schoenocaulon, native to Mexico, Central America, and Venezuela. It belongs to the family Melanthiaceae and is characterized by its tall, slender stems and narrow leaves.
The genus Schoenocaulon is a North American genus of perennial herbaceous flowering plants ranging from the southern United States to Peru, and is a member of the Melanthiaceae according to the APG III classification system, placed in the tribe Melanthieae. The medicinally and commercially used species, S. officinale, bears the common name Sabadilla (pronunciation: /sab-uh-dil-uh/, IPA: /ΛsΓ¦b ΙΛdΙͺl Ι/), while another common name for the genus is "feathershank." The plant is also historically known by the names cevadilla and caustic barley. Sabadilla is derived from the ripe seeds of Schoenocaulon officinale, a tropical lily plant that grows in Central and South America, and is also sometimes known as cevadilla or caustic barley.
The species with the longest history of use, and the most readily available, is Schoenocaulon officinale. Mexico is the center of Schoenocaulon diversity, with 22 endemic species β some with distributions limited to single mountain ranges. The two species with the widest distributions, S. yucatanense and S. officinale (sabadilla), may have been spread by pre-Columbians who used the seeds as pesticides.
Morphologically, the plant is bulbous and caespitose (growing in tufts), with linear leaves tapering to a point, approximately four feet long, channeled above and carinate (keeled) on the back. The scape is naked, roughly the height of a man, entirely simple, and terminated by a raceme approximately 18 inches long. The perianth is deeply six-parted, spreading, and yellowish-white, with linear, thick, veinless, obtuse segments. Petal and sepal color varies by species, with some shade of green being most common, though maroon, cream, and bright red are also represented across the genus.
The chemical CAS Registry Number assigned to the bulk sabadilla alkaloid mixture (veratrine) is 8051-02-3. The chemical class is categorized as "botanical." The principal alkaloids β veratridine (CAS No. 71-62-5; molecular formula C36H51NO11) and cevadine (CAS No. 62-59-9; molecular formula C32H49NO9) β together constitute the pharmacologically active fraction of the seed.
The commercially and medicinally relevant material is derived exclusively from the seeds of S. officinale. Cevadilla or sabadilla consists of the seeds of Schoenocaulon officinale, a plant found from Mexico to Venezuela. The seeds are dark brown to black, sharply pointed, and about 6 mm long. The seeds have historically been used by pharmacists around the world to prepare delousing solutions and insecticides.
Sabadilla is encountered in several distinct preparation forms:
When sabadilla seeds are aged, heated, or treated with alkali, several insecticidal alkaloids are formed or activated. This property accounts for historical practices of roasting or steeping the seeds before application.
The crushed seeds of Schoenocaulon officinale (earlier Veratrum sabadilla), indigenous to Central America and the northern region of South America, are known as sabadilla powder and were used by the American Indians in pre-Columbian times as an insecticide. Sabadilla was used as an insecticide from the sixteenth century, and especially from 1850 to 1950.
Discovered by native American Indians in northern South and Central America centuries ago, it was used in wounds against vermin. A powder prepared from the dried seeds of Schoenocaulon officinale has historically been used to expel parasitic worms and to kill mites in hair.
In Europe, the powdered seeds became known as pulvis capucinorum, used as a louse powder and vermifuge. The crushed seeds were known as sabadilla powder and were used by the American Indians in pre-Columbian times as an insecticide β for example as louse powder and vermifuge, described as pulvis capucinorum in Europe. The seeds were used by pharmacists around the world to prepare delousing solutions and insecticides, and the plant is still collected and used locally to rid domestic animals of fleas, ticks, lice, and other parasites.
Sabadilla alkaloids occupied a notable place in 19th-century pharmacopoeias and clinical medicine, particularly through the prepared alkaloid mixture known as veratrine.
Cevadilla seeds were used as a vermifuge and to destroy vermin in the hair, but their dangerous drastic and irritating properties eventually caused them to be dismissed from practice. They were principally used in the manufacture of veratrine; and rarely, but with great caution, in some nervous diseases and tapeworm. The dose cited in historical practice was from 5 to 15 grains for the expulsion of tapeworm and other worms. An extract was reported as beneficial in painful rheumatic and neuralgic affections.
The French clinician M. Trousseau documented the use of veratrine (derived from sabadilla alkaloids) in the treatment of acute articular rheumatism in the mid-19th century. In this clinical account, one pill containing one-tenth of a grain of veratrine was given on the first day, two on the second, three on the third, increasing the dose by one pill each day, rarely going beyond six or seven.
Veratrum alkaloids had been used in the 19th century as emetics and cathartics and as the source of an organic caterpillar killer. Among the earliest pharmacological remedies for hypertension were nitrites, thiocyanates, dehydrogenated alkaloids of ergot, pyrogens, and veratrum viride and its extracts. The rational use of certain Veratrum alkaloids in the treatment of hypertension had its scientific origin and pharmacological basis in the observation of von Bezold and Hirt (1867) that veratrine β a mixture of alkaloids from sabadilla seeds β causes a decrease in blood pressure in the mammalian circulation. Von Bezold assumed this to be due to reflex activity originating in the heart.
Veratrum viride was used for more than a century in the form of a tincture, aqueous extract, or powder for the treatment of hypertension or the convulsions of toxemia of pregnancy, though these substances varied greatly in potency, were unstable, and therefore did not attain widespread application in clinical practice.
Sabadilla has been used commercially since the 1970s as a botanical insecticide. Veratrine was notably used against thrips in citrus and avocado farming. Sabadilla dust made from the dried seeds of a South American lily was once widely used by organic gardeners to control squash bugs. The registered use for sabadilla products has been to control sucking insects on citrus and mango.
Sabadilla was incorporated into the homeopathic materia medica, where its crude action of irritating mucous membranes and provoking sneezing was taken as the basis for its application in symptoms resembling hay fever and allergic rhinitis. Historically, indigenous tribes in Mexico and Central America used the seeds as an insecticide due to their high alkaloid content, particularly cevadine and veratridine, which are toxic in their crude form. In homeopathy, the principle of similars led to sabadilla's use in respiratory complaints closely resembling its crude symptom picture.
The crushed seeds of Schoenocaulon officinale are known as sabadilla powder, and the sabadilla alkaloids belong to the ceveratrum group of Veratrum alkaloids, characterized by a C-nor-D-homosteroid skeleton containing 6β8 hydroxyl groups of which at least one is esterified.
The primary alkaloids of sabadilla seeds are:
The main active compounds are veratridine and cevadine, esters of the nontoxic veracevine. Together they represent 0.8% of the commercial powder. The alkaloid preparation contains mainly cevadine and veratridine at a proportion of approximately 2:1.
Sabadilla yields about 0.3 percent veratrine by weight. The seeds also contain veratric acid, cevadic acid, fat, and resin. Being weak bases, the sabadilla alkaloids are soluble at acidic pH.
Sabadilla seeds, when assayed, have been found to yield from 4.25 to 4.35 percent of total alkaloid by some methods, while the yield is usually stated to be only from 1 to 2 percent. The seeds contain 2β4% of a biologically active alkaloid mixture called veratrine. Significant variation in the level of individual alkaloids β particularly veratridine β has been noted between commercial batches despite similar levels of total alkaloids. This has led to recommendations that future formulations should be standardized by levels of individual cevadine and veratridine rather than total alkaloid content.
The dominant, well-established mechanism of action of sabadilla's principal alkaloids is the activation and modification of voltage-gated sodium (NaV) ion channels in excitable tissues β nerve, cardiac muscle, and skeletal muscle.
The vegetal alkaloid toxin veratridine (VTD) is a selective voltage-gated Na+ (NaV) channel activator, widely used as a pharmacological tool in vascular physiology. Veratridine has been used as a potent voltage-gated Na+ channel activator in many excitable tissues, and like the other lipid-soluble neurotoxins batrachotoxin and aconitine, is thought to target the type 2 receptor site (D1-S6) of the Ξ± subunit of the voltage-gated Na+ channel, causing depolarization of the resting membrane potential and repetitive action potential firing.
Veratridine is an important research tool because it selectively increases intracellular Na+ influx by delaying and shifting to more negative potentials the inactivation of voltage-gated Na+ channels. The neurotoxin veratridine inhibits NaV1.5 inactivation, resulting in longer channel opening times and potentially fatal action potential prolongation. VTD is predicted to bind at the channel pore, though alternative binding sites have not been ruled out.
Mutations at residues L409, E417, and I1466 have large effects on VTD binding, while residues deeper in the pore had no effect, consistent with VTD binding at the mouth site. Overall, results suggest a VTD binding site close to the cytoplasmic mouth of the channel pore, which might indicate an allosteric inactivation mechanism for VTD at NaV1.5.
It has been concluded that active ceveratrum alkaloids and cevadine act on the Na channel and share the same receptor within the Na channel. The effects of ceveratrum alkaloids on 22Na+ influx into cultured neuroblastoma cells and their effects on cardiac cells have been studied. The stimulatory effect on 22Na+ influx is inhibited by tetrodotoxin and potentiated by toxin V of Anemonia sulcata, confirming the NaV-channel site of action.
NaV channels expressed in arteries contribute to vascular tone in mouse mesenteric arteries. Research has demonstrated that VTD induces vasorelaxation in mouse cecocolic arteries, a model of resistance artery. VTD-induced vasorelaxation involves the activation of endothelial NO synthase (eNOS), mediated by the increase in intracellular Ca2+ through the NCX Ca2+ entry mode in endothelial cells. This mechanism historically underpinned the attempted use of veratrum alkaloids in hypertension treatment.
Cevadine, veratridine, and related ceveratrum alkaloids have a mode of action that is similar to that of the pyrethrins, in that they activate the voltage-sensitive sodium channels of nerve, heart, and skeletal muscle cell membranes, although the binding site appears to be different. They are insecticides with contact action, and initial effects include paralysis, with death occurring later.
Both veratridine and cevadine are degraded in air and sunlight, which makes them environmentally relatively short-lived. Sabadilla acts as a contact and a stomach poison, and the sabadilla alkaloids (veratridine and cevadine) act on the voltage-sensitive sodium channels of nerve, heart, and skeletal muscle cell membranes, with a mode of action seemingly similar to that of the pyrethrins.
The primary pharmacological target of sabadilla alkaloids is the nervous system via voltage-gated Na+ channels. Sabadilla is a potent neurotoxic insecticide due to the presence of alkaloids such as cevadine and veratridine. When insects come into contact with sabadilla, the alkaloids disrupt the sodium channels within their neurons, leading to paralysis and death. The same channel-level mechanism is relevant in mammalian toxicology.
Symptoms of veratrum alkaloid poisoning include vomiting, nausea, and abdominal pain, followed by cardiovascular effects such as severe bradycardia, hypotension, and in severe cases, cardiac conduction abnormalities and death. Historically, this cardiac depressant action was leveraged therapeutically: protoveratrine (a related veratrum alkaloid) was found to produce a striking fall in blood pressure in both essential and renal hypertension after intravenous administration.
The dust from the seeds can cause eye and nasal irritation. Sabadilla can be severely irritating to skin and mucous membranes, and has a powerful sneeze-inducing effect when inhaled. This potent irritant action on respiratory mucosa β producing copious sneezing, rhinorrhea, and lacrimation β is the observation that underpins the homeopathic use of sabadilla in allergic rhinitis.
Cevadilla seeds were historically used as a vermifuge and to destroy vermin in the hair, but their dangerous drastic and irritating properties caused them to be dismissed from practice. Internal use as a vermifuge was recorded for expulsion of tapeworm (Taenia) and other intestinal worms.
Veratrine is sometimes used externally, as in ointments, in the local treatment of neuralgia and rheumatism. Topical preparations were historically employed for rheumatic and neuralgic pain.
Evidence level: Well-established for specific arthropod pests; supported by controlled laboratory studies and some field data.
Both cevadine and veratridine, the two major components of the insecticidal fraction of sabadilla, are highly toxic to citrus thrips. LC50s of cevadine and veratridine were 18.25 and 29.91 ng/cm2, respectively, whereas veracevine, the parent alkamine, was much less active.
Sabadilla is considered one of the least toxic plant extracts with pesticide activity, considered a contact and stomach poison with minimal residual activity. Its spectrum includes thrips (Thysanoptera), aphids, whiteflies, leafhoppers, squash bugs, and other sucking insects. Sabadilla is a traditional insecticidal preparation used in Central and South America and commercially used since the 1970s. Sabadilla powder prepared from Schoenocaulon officinale contains a mixture of veratridine, cevadine, and other alkaloids, and is effective against thrips.
Environmental persistence is low: both veratridine and cevadine are degraded in air and sunlight, making them environmentally relatively short-lived. However, sabadilla is toxic to bees, which represents a significant non-target species concern.
Evidence level: Weak and preliminary; no rigorous placebo-controlled clinical trials specifically on sabadilla as a homeopathic preparation have been published in high-quality peer-reviewed journals. The broader homeopathic literature for allergic rhinitis is methodologically heterogeneous.
A prospective observational study assessed the clinical utility of Sabadilla officinalis in managing allergic rhinitis in children aged 7 to 12 years. The study was conducted at a homeopathic outpatient department and involved 30 pediatric patients. Clinical symptom severity was measured using the Visual Analogue Scale (VAS) at baseline and during monthly follow-ups over a period of three months. Sabadilla officinalis was prescribed in varying potencies, individualized based on each patient's symptom totality. The authors suggested that Sabadilla officinalis may be a promising therapeutic option for managing allergic rhinitis symptoms in children; however, further randomized controlled trials were recommended. This study is an uncontrolled observational case series and cannot establish efficacy due to the absence of a comparator or placebo arm.
A published case series from the International Journal of Homoeopathic Sciences evaluated homeopathically prepared Sabadilla officinarum 30CH and 200CH in pediatric allergic rhinitis. The case series aimed to evaluate the clinical efficacy of Sabadilla officinalis, prescribed homeopathically, in paediatric cases of allergic rhinitis, assessing three children based on clinical symptomatology and totality of symptoms. This study was able to demonstrate that homeopathically prepared Sabadilla officinarum 30CH and 200CH had a positive inhibitory effect in the treatment of allergic rhinitis. A three-patient case series is classified as very low-quality evidence.
Regarding the broader homeopathic evidence context relevant to sabadilla's primary claimed indication: although there is some evidence that homeopathy may be effective in treating symptoms of seasonal allergic rhinitis (SAR), there is a lack of high-quality clinical trials. The aim of a prospective HOMEOSAR randomized controlled trial was to determine the efficacy of individualized or standardized homeopathic drug treatment compared to placebo regarding rhinitis-related quality of life. In several trials, homeopathy has been implemented in the treatment of allergic rhinitis; however, the evidence of its efficacy remains unclear. The most common homeopathic treatment strategy is individualized classical homeopathy. To date, the only studies that have investigated the efficacy of this treatment strategy for allergic rhinitis have been observational, with a high risk of selection bias, rather than randomized and placebo-controlled.
It should be noted that homeopathic preparations of sabadilla (e.g., 30C, 200C) contain no molecules of the original alkaloid substance. The pharmacological mechanisms described in this article pertain to the crude alkaloids, not to homeopathic dilutions.
Evidence level: Historical clinical data from the mid-20th century; the use of Veratrum alkaloids for hypertension has been abandoned due to toxicity and superior alternatives.
Once used for the pharmacological treatment of hypertension, veratridine nowadays does not have any therapeutic application. Clinical studies were conducted in the late 1940s and 1950s with standardized veratrum preparations (not specifically sabadilla, but related species and alkaloid mixtures). Veratrum viride was used for more than a century in the form of a tincture, aqueous extract, or powder for hypertension or convulsions of toxemia of pregnancy, but these substances varied greatly in potency, were unstable, and therefore did not attain widespread application in clinical practice. The drug class was supplanted by safer antihypertensive agents by the 1960s.
Evidence level: Historical case reports only; no modern clinical trials.
An extract of sabadilla was reported in historical medical literature as beneficial in painful rheumatic and neuralgic affections. Veratrine is sometimes used externally, as in ointments, in the local treatment of neuralgia and rheumatism. No controlled clinical studies evaluating topical sabadilla or veratrine preparations for neuralgia or rheumatic pain are available in the modern scientific literature.
Evidence level: Patent claims only; no peer-reviewed human clinical evidence.
The sabadilla alkaloids are known for their use as insecticides; however, antiviral efficacy has been explored in patent literature. Patent filings have explored extracts of S. officinale in formulations intended to reduce the duration of the common cold, though these are patent claims and do not constitute peer-reviewed clinical evidence. No published randomized controlled trials on sabadilla's antiviral properties in humans were identified.
The dosages reported in historical and contemporary sources vary greatly by intended use and preparation. Modern therapeutic or supplemental dosing in humans is not established by any regulatory body or clinical guideline.
Sabadilla (Schoenocaulon officinale) is highly toxic, containing veratridine, cevadine, and other alkaloids. Purified veratrine alkaloids are quite toxic and are considered on a par with the most toxic synthetic insecticides.
Symptoms of veratrum alkaloid poisoning include vomiting, nausea, and abdominal pain, followed by cardiovascular effects such as severe bradycardia, hypotension, and in severe cases, cardiac conduction abnormalities and death. Clinical studies monitoring the effects of Veratrum alkaloids on blood pressure have exhibited diverse findings. With prompt supportive care, patients usually make a full recovery within the first day.
Veratridine is responsible for acute intoxication that occurs when it is erroneously ingested because it is mistaken for the medicinal herb Gentiana lutea. This is a documented pattern of accidental poisoning in Europe.
Veratrine exhibits moderate acute toxicity via oral and inhalation routes but is classified as non-toxic for dermal exposure. The primary adverse effects observed in studies include body weight changes and neurotoxic signs such as ataxia and reduced motor activity, mostly reversible after cessation of exposure.
Sabadilla can be severely irritating to skin and mucous membranes, and has a powerful sneeze-inducing effect when inhaled. The dust from the seeds can cause eye and nasal irritation.
Cevadine has the highest mammalian toxicity among the major alkaloids, with an LD50 of 5.8 mg/kg peritoneally in mice. Veratrine is a human poison by ingestion, an experimental poison by ingestion and intraperitoneal and subcutaneous routes, and has been identified as an experimental teratogen β the latter designation based on animal experimental data.
The neurotoxin veratridine inhibits NaV1.5 inactivation, resulting in longer channel opening times and potentially fatal action potential prolongation. Exposure to significant quantities of sabadilla alkaloids can induce severe bradycardia and life-threatening cardiac arrhythmias due to persistent sodium channel activation in cardiac tissue.
Sabadilla is toxic to bees. The alkaloids cevadine and veratridine act as nerve poisons and are harmful to pollinator honey bees. They are insecticides with contact action, and initial effects include paralysis. Both veratridine and cevadine are degraded in air and sunlight, which contributes to their relatively low environmental persistence.
A significant element of the risk profile includes strict labeling and application guidelines to prevent accidental exposure to humans and non-target species. These directions specify that handlers wear protective clothing, such as long-sleeved shirts, pants, and gloves, particularly when using emulsifiable concentrate formulations.
The U.S. EPA has conducted human health risk assessments for veratrine (the standardized sabadilla alkaloid extract). Veratrine, previously referred to as sabadilla 10% alkaloid extract or SABA-10, has been assessed for exposure and risk as a proposed new active ingredient. The level of concern (LOC) for inhalation risk assessment is 30, which includes a 10Γ uncertainty factor for intraspecies variation and a 3Γ uncertainty factor for interspecies extrapolation; the 3Γ interspecies uncertainty factor was reduced from 10Γ due to the calculation of human-equivalent concentrations accounting for pharmacokinetic interspecies differences.
The dangerous drastic and irritating properties of cevadilla seeds caused them to be dismissed from medical practice, and they were principally retained for the manufacture of veratrine rather than for direct therapeutic use.
Health conditions that Sabadilla may help support.
Body systems that Sabadilla may help support.
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