Fritillary

Fritillary (Fritillaria spp.): A Comprehensive Reference

1. Identity: Botanical Classification, Natural Source, and Common Names

Genus Fritillaria belongs to the monocot family Liliaceae, native to the temperate regions of the northern hemisphere. To date, 165 Fritillaria species have been identified worldwide, found in the temperate zone of the Northern hemisphere. All species of Fritillaria are geophytic perennials and bulbiferous. The bulbs are composed of a few fleshy, farinaceous scales, often covered with a translucent tunic.

The genus encompasses numerous medicinally relevant species, of which the following are most documented in pharmacopeial and scientific sources:

• Fritillaria cirrhosa D. Don — Known in Chinese as Chuan Bei Mu (Sichuan fritillary). Fritillary in the traditional medicinal sense is the processed bulb of Fritillaria cirrhosa, a flowering plant in the Liliaceae family. A perennial temperate herb, it grows in mountain slopes and sub-alpine meadows, usually on open, stony, and moist hillsides. It is traditionally valued as an herbal remedy in Nepal and China, where it grows in the Gansu, Qinghai, Sichuan, Xizang, and Yunnan provinces.
• Fritillaria thunbergii Miq. — Known as Zhe Bei Mu (Thunberg fritillary) in Chinese, Setsubaimo in Japanese, and Jeolpaemo in Korean. It is a perennial herbaceous plant widely cultivated in the south-eastern coastal, south-central, and eastern areas of China, mostly in the provinces of Zhejiang, Jiangsu, Anhui, and Hunan.
• Fritillaria unibracteata Hsiao et K.C. Hsia — One of the primary source plants of the drug "Chuanbeimu." It is a biological resource featured in the Tibetan Plateau of China.
• Fritillaria ussuriensis Maxim. — Native to northeastern China, including Liaoning, Heilongjiang, and Jilin provinces.

Officially, natural Beimu is prepared by utilizing the bulbs of nine distinctive Fritillaria species: Fritillaria unibracteata Hiao et Hsia, Fritillaria thunbergii Miq., Fritillaria cirrhosa D. Don, Fritillaria delavayi Franch, Fritillaria przewalskii Maxim ex Batal, Fritillaria ussuriensis Maxim., Fritillaria pallidiflora Schrenk, Fritillaria walujewii, and Fritillaria hupehensis Hsiao et K. C. Hsia.

According to different origins and treatment symptoms, the Pharmacopoeia of the People's Republic of China includes five types of Fritillaria medicinal materials: Fritillariae Cirrhosae Bulbus (FCB), Fritillariae Thunbergii Bulbus (FTB), Fritillariae Ussuriensis Bulbus (FUB), Fritillariae Pallidiflorae Bulbus (FPB), and Fritillariae Hupehensis Bulbus (FHB).

In Chinese, the drug is collectively called Bei Mu or Pei Mu, and in Japanese Bai-mo. As medicine, fritillary is graded into four categories based on shape and the location in which it was grown: song-pei, lu-pei, ching-pei, and ming-pei.

2. Traditional and Historical Use

2.1 Chinese Medicine

Genus Fritillaria belongs to the monocot family Liliaceae, native to the temperate regions of the northern hemisphere. It has long been considered a source of bioactive pharmaceutical ingredients that have been used in Chinese medicine for thousands of years.

As early as Shennong's Classic of Materia Medica (about 200 A.D.), Chuanbeimu (CBM) has been recorded to be used as medicine for more than 2,000 years. According to historical materials, before the Ming dynasty, FCB and other Fritillaria bulbs such as Fritillariae Thunbergii Bulbus (known as zhebeimu, FTB) were collectively named "Beimu." Beimu was first recorded in "Shen Nong Ben Cao Jing," the earliest monograph of TCM, and has been described as a cough medicine with good throat clearing and detoxification effects.

Until the Ming dynasty, another medical monograph called "Ben Cao Hui Yan" (Nizhumo, 1624, Ming dynasty) summarized the differences between FCB and FTB, indicating that FCB tended to moisten the lung, eliminate phlegm, and relieve cough and asthma, while FTB tended to clear heat and detoxify.

In addition, five classic books, including Ben Cao Zheng Yao (Evidence of Materia Medica, LI Zhongzi, 1673, Qing dynasty), Ben Jing Feng Yuan (Doctrine of Origin, ZHANG Lu, 1695, Qing dynasty), Ben Cao Gang Mu Shi Yi (Supplement to the Compendium of Materia Medica, ZHAO Xuemin, 1765, Qing dynasty), Ben Cao Bian Du (Simple Materia Medica, ZHANG Bingcheng, 1887, Qing dynasty), and Ben Cao Zheng Yi (Merits of Herbal Medicine, ZHANG Shanlei, 1920, Republic of China), specified that the unique actions of FTB were to clear the Lung and calm the Liver, disperse the Lung-Qi to relieve depression, clear the Heart and reduce the heat.

In summary, FTB acts to clear heat, resolve phlegm, relieve cough, remove toxicity, and disperse abscesses and nodules. Various Fritillaria species have been recorded in the Pharmacopoeia of the People's Republic of China (1995, 2000, 2005, 2010, and 2015 editions) and are widely distributed across China.

Practitioners of Chinese medicine believe that fritillary affects the heart and lung meridians, or energy pathways in the body, and use it primarily to treat various lung conditions, including asthma, bronchitis, tuberculosis, and coughs of any type. In the traditional Chinese medical system, the white color of fritillary is thought to indicate its usefulness for ailments of the lungs, which are associated with the color white. Fritillary's medicinal properties are considered bitter, sweet, and mildly cold.

FTB is a significant traditional Chinese herb with bitter and cold properties, entering the Lung and Heart channels. It is generally prescribed as one of the ingredients of herbal formulas, such as Danggui Beimu Kushen Wan (Chinese Angelica, Fritillaria and Flavescent Sophora Pill; DBKW) in traditional and contemporary clinical practice.

FRU is known as the "Holy Medicine for cough," with the effects of clearing heat and moistening the lungs, resolving phlegm, relieving cough and resolving masses, and is widely used in traditional Chinese medicine (TCM) for the treatment of diseases of the respiratory system.

2.2 Use in Other Medical Traditions

The medicinal use of Fritillaria species is also well established in China, the Himalayas (India, Nepal, and Pakistan), Japan, Korea, and Southeast Asia.

Fritillary is a significant component of Ashtavarga (a set of eight medicinal herbs), Chyavanprash, and other Ayurvedic formulations in the Indian medical system. The roots are used for healing wounds and corns in Ayurvedic and Unani medicine. The bulbs of Fritillaria roylei are utilized as decoction or in dried form to cure bronchitis, cough, tumors, asthma, hemoptysis, and insufficiency of milk.

In customary traditions, Fritillaria imperialis has been utilized for the treatment of different diseases like asthma, pharyngitis, bronchitis, cough, struma, haemoptysis, dysuria, and gland tumour.

Locals of Çatak in Turkey use some Fritillaria species in treatment of several diseases, for example wound healing.

2.3 Traditional Preparations

In long-term clinical practice, TCM preparations are usually made into decoctions, powders, pills, and other oral dosage forms. Because the raw bulb is toxic, all medicinal forms are processed. Good quality processed powder is white and has a fine consistency. Small, white, lobed bulbs that have been boiled or steamed and dried may also be available.

3. Key Chemical Constituents and Active Compounds

3.1 Overview of Phytochemistry

Approximately 140 compounds have been isolated from 35 Fritillaria species, and the majority belongs to isosteroidal alkaloids (72.7%), followed by steroidal alkaloids (11.5%) and non-alkaloids (15.8%). Some non-alkaloid constituents containing saponin, terpenoids, steroids, succinic acid, thymidine, and adenosine in different Fritillaria species have also been identified.

A comprehensive phytochemical profile of Fritillariae Thunbergii Bulbus identified 134 chemical constituents, including 26 alkaloids, 29 compounds found in essential oils, 13 diterpenoids, two carbohydrates, two sterols, 18 amino acids, six nucleosides, four nucleobases, four fatty acids, three lignans, and 27 elements.

The study of the chemical constituents of Fritillaria began in 1888 when Fragner isolated imperialine from F. imperialis L. Subsequently, an increasing number of German, Japanese, and Chinese chemists began to participate in this study. In 1955, using the method of selenium dehydrogenation and degradation, researchers determined that the basic skeleton of alkaloids in Fritillaria was metamorphic steroids.

3.2 Principal Alkaloids

The chemical constituents in Bulbus Fritillariae (BF) have been extensively investigated and include alkaloids, steroidal saponins, diterpenes, polysaccharides, and other compounds. The alkaloids are divided into two main structural classes: isosteroidal alkaloids and steroidal alkaloids.

Major isosteroidal alkaloids include:

• Imperialine — One of the most biologically significant alkaloids, consistently identified as a principal active constituent. Among the antitussive, expectorant, and anti-inflammatory bioactive components, imperialine serves the most critical role.
• Peimine (verticine) and peiminine — Isosteroidal alkaloids are major phytochemicals, of which peiminine and peimine are the two principal alkaloid constituents.
• Verticinone — Verticine belongs to a kind of isosterol alkaloid and is a major bioactive constituent of Fritillaria widely used as an antitussive and expectorant.
• Peimisine, isoverticine, hupehenine, ebeiedine, ebeienine, and ebeiedinone — Bioactive isosteroidal alkaloids including verticine, verticinone, isoverticine, imperialine, hupehenine, ebeiedine, ebeienine, and ebeiedinone, along with two nucleosides (thymidine and adenosine), contribute to medicinal activity.
• Chuanbeinone — Identified as a key anti-inflammatory alkaloid.

From Fritillaria ussuriensis bulbs, four steroidal alkaloids — imperialine, peimisine, verticinone, and verticine — were extracted and identified, and showed notable cytotoxic impacts; peimisine and verticinone demonstrated the most critical inhibitory effects.

3.3 Non-Alkaloid Constituents

The chemical constituents that have been isolated and identified in Fritillaria unibracteata include alkaloids, sterols, organic acids and their esters, nucleosides, and volatile oils. The volatile oils in Fritillaria have potent anti-inflammatory, antibacterial, and analgesic effects.

Fritillary preparations always contain saponins, alkaloids, amino acids, flavones, and polysaccharides. Among them, Fritillaria polysaccharides have a variety of biological activities; their anti-inflammatory and anti-aging activities are new study hotspots.

3.4 Biosynthesis

Studies have shown that steroidal alkaloids can be synthesized in plants via both the MVA (mevalonate) and MEP pathways. The MEP pathway is abundant in leaf and stem tissues, while the MVA pathway is abundant in bulbs. The biosynthetic pathways and regulatory mechanisms associated with Fritillaria alkaloids have not been clearly defined.

3.5 Effect of Growing Conditions on Constituent Profile

Differences in the place of origin and growing conditions affect the contents of medicinal plants. Studies have shown that light-emitting diodes affect the steroidal alkaloid contents in fritillaries; red- and infrared-light exposure increases fritillary alkaloid content. Different drying methods also affect alkaloid retention. Investigations showed that the total content of peimine and peiminine was preserved to the maximum with hot air drying at 60°C, while oven drying produced the highest alkaloid content compared with other drying methods.

4. Mechanisms of Action

4.1 Antitussive Mechanisms

The material basis for the antitussive effect includes imperialine, chuanbeinone, verticinone, and verticine isolated from Bulbus Fritillariae Cirrhosae (BFC), which markedly inhibit cough frequency and prolong the latent period of cough in mice caused by ammonia. The specific material basis for the expectorant effect — imperialine, verticinone, and verticine — can significantly increase the output of phenol red in mice trachea in the expectorant test. The specific material basis for the anti-inflammatory effect, imperialine and chuanbeinone, can obviously inhibit ear edema of mice in a dose-dependent manner.

Of these alkaloids, imperialine and isortyline exhibited antitussive effects in a dose-dependent manner.

4.2 Anti-Inflammatory Mechanisms

Verticinone or imperialine, also found in FRC, can dose-dependently inhibit the production of nitric oxide, expression of both nitric oxide synthase and cyclooxygenase-2, and production of pro-inflammatory cytokines such as TNF-α and IL-1β. Results clearly demonstrate that verticinone or imperialine could dose-dependently inhibit nitric oxide production and also suppress inducible nitric oxide synthase and cyclooxygenase-2 expressions.

4.3 Anticancer Mechanisms

Pharmacological research on verticine has reported its valuable benefits in a variety of diseases, especially anticancer effects. Documented pharmacological effects include antitumor, anti-inflammatory, protection against acute lung injury, bronchodilation, inhibition of angiotensin-converting enzyme and acetylcholinesterase, antitussive/expectorant, sedative, and analgesic actions.

Network pharmacological analysis identified PIK3CG, SRC, JAK3, AKT2, and PRKCA as key potential targets of peiminine in lung cancer treatment. Molecular docking results demonstrated strong binding affinities between peiminine and PIK3CG, SRC, and JAK3. In vitro, peiminine inhibited H1299 cell viability and regulated genes involved in the PI3K–Akt pathway (PI3K, AKT, and PTEN) and apoptosis (Bcl-2, Bax), suggesting that it may induce its effects via PI3K–Akt pathway inhibition.

Peimine has been studied for its role in disrupting intracellular calcium homeostasis. At doses of 2.5, 5, and 10 μM, peimine significantly inhibited the growth of prostate cancer cells (DU-145, LNCap, and PC-3), without significant effect on normal prostate cells (RWPE-1). Peimine treatment also inhibited the invasion and migration of PC-3 cells and blocked the epithelial-mesenchymal transition process.

4.4 Acetylcholinesterase (AChE) Inhibition

Compounds including verticine were identified and reported to show AChE inhibitory actions in vitro in the same species of genus Fritillaria. This inhibitory activity may have relevance to the herb's traditional use for respiratory and neurological symptoms, as AChE inhibition can reduce bronchoconstriction and influence neurotransmission.

4.5 Angiotensin-Converting Enzyme (ACE) Inhibition

Inhibition of angiotensin-I-converting enzyme action in a dose-dependent way has been found by in vitro investigation of verticinone, imperialine, and peimisine alkaloids from Bulbus Fritillariae ussuriensis.

4.6 Antifibrotic and Lung-Injury-Protective Mechanisms

By screening 55 active components (mainly alkaloids) of BFC, 172 cross-targets related to asthma were predicted, a protein interaction network was constructed, and 20 core targets, such as STAT3, TNF, EGFR, and HSP90AA1/HSP90AB1, were identified. Functional enrichment analysis showed that BFC affected inflammatory response, immune activation, and hormone sensitivity by regulating NF-κB signal, arachidonic acid metabolism, and calcium ion pathways.

5. Scientific Evidence by Area of Use

5.1 Respiratory Conditions: Cough, Expectorant, and Antitussive Effects

Fritillary preparations are used in traditional Chinese medicines that are often administered in clinical settings, as they have notable effects on cough, bronchitis, pneumonia, lung injury, cancer, and other diseases.

Evidence type and strength: Predominantly animal/in vivo and in vitro; limited robust human clinical trial evidence.

One peer-reviewed study evaluated the antitussive, expectorant, and anti-inflammatory effects of alkaloids imperialine, chuanbeinone, verticinone, and verticine isolated from BFC. The results showed that all the alkaloids significantly inhibited cough frequency and increased latent period of cough in mice induced by ammonia. Additionally, imperialine, verticinone, and verticine markedly enhanced mice's tracheal phenol red output in expectorant evaluation, and imperialine and chuanbeinone significantly inhibited the development of ear edema in a dose-dependent manner in anti-inflammatory assessment.

The alkaloids present in F. cirrhosa can notably increase the excretion of phenol red within the trachea of mice, a method for evaluating expectoration, indicating that F. cirrhosa can relieve cough and reduce phlegm. Moreover, FRC extract increased cough latency and suppressed cough frequency in mice. As an anti-inflammatory compound, FRC extract also prevented the development of ear edema and enhanced the output of phenol red into the trachea of mice. Thus, the pharmacological outcomes of FRC in terms of relieving cough, resolving phlegm, and reversing inflammation have been demonstrated.

Cough treatment using natural products from Fritillaria has significant advantages compared with the usual drugs, such as codeine, and displays less or no side effects. However, this comparative claim is based on preclinical evidence and requires confirmation in rigorous head-to-head human clinical trials.

A drug (a tablet of F. thunbergii flower extract) used for the treatment of cough and phlegm was approved by Chinese drug regulatory authorities. This approval represents regulatory acceptance, though detailed clinical trial data from this approval process are not fully available in the open literature reviewed.

5.2 Anti-Inflammatory Effects

Evidence type and strength: Primarily in vitro and animal model studies; no robust human clinical trials identified.

All four alkaloids, imperialine, imperialine-β-N-oxide, isoverticine, and isoverticine-β-N-oxide isolated from BFC had significantly antitussive, expectorant, and anti-inflammatory effects. These findings are from preclinical models. Alkaloids are the most active constituents acknowledged; however, other constituents like polysaccharides and saponins may have synergistic effects with alkaloids in treating respiratory disease, and the interaction between alkaloids and others remains poorly understood.

5.3 Anticancer and Antitumor Activity

Evidence type and strength: Predominantly in vitro (cell line) and some in vivo (mouse model) studies; no human clinical trial evidence identified in the reviewed literature.

Experimental studies have shown that both BFT and FFT have anticancer activities. Studies have confirmed that BFT has anticancer effects on lung, liver, breast, and other cancers, but only one systematic pharmacological study has been conducted on the therapeutic effects of FFT on lung cancer.

Peiminine and hepatocellular carcinoma: Peiminine reduced the viability of HepG2 (human hepatocellular carcinoma) cells in a time- and dose-dependent manner, with an IC50 of 4.58 μg/mL at 24h. Peiminine significantly increased the percentage of apoptotic cells and the mitochondrial membrane potential dose-dependently in HepG2 cells. It has been reported that peiminine repressed colorectal carcinoma tumor growth by inducing apoptosis and autophagy.

Peiminine and lung cancer: In vitro experiments on human H1299 non-small cell lung cancer (NSCLC) cells assessed peiminine's anti-tumor activity and measured key gene transcription levels. UHPLC-MS/MS analysis revealed that Fritillaria ussuriensis Maxim. from Mudanjiang (Heilongjiang Province) exhibited the highest peiminine content. Peiminine exhibits significant anti-lung cancer potential by targeting key genes such as PIK3CG, SRC, and JAK3, as well as by modulating the PI3K-Akt signaling pathway and apoptosis-related genes. These results lay a foundation for further investigations into peiminine as a potentially effective therapeutic option for treating lung cancer.

Peiminine and gastric cancer: Peimine, a natural product extracted from Fritillaria, has anti-inflammatory, drug resistance reversal, and other pharmacological effects. Results showed that PM significantly reduced the activity of gastric cancer cells, with the most obvious effect in MKN-45 cells. Annexin V-FITC/propidium iodide staining and flow cytometry were used to assess apoptosis, and results showed that PM-induced apoptosis of MKN-45 cells.

Steroidal alkaloids in transplantable tumor models: All tested alkaloids showed significant cytotoxicity, with peimisine inducing G0/G1 phase arrest and increased apoptosis. The results showed that total alkaloids from Fritillaria ussuriensis (TAFU) had significant antitumor activity and low toxicity in vivo. Immunohistochemical examinations showed that TAFU remarkably increased caspase-3 expression and reduced microvessel density (MVD) in tumor tissues of transplantable S180 and LLC tumor models.

Important caveat: All anticancer evidence for Fritillaria alkaloids to date is preclinical (cell culture and animal models). No published human clinical trials on Fritillary's anticancer effects were identified in the peer-reviewed literature reviewed for this article.

5.4 Anti-Asthmatic Effects

Evidence type and strength: In vitro and animal evidence; very limited human clinical data.

Bulbus Fritillariae ussuriensis (BFU), in view of its antiasthmatic, expectorant, and antitussive actions, is utilized as food and orthodox medication, scattered throughout the northeast areas of China, including Liaoning, Heilongjiang, and Jilin areas, and also for treating swollen throat and lung diseases in Chinese medication. Antitussive, expectorant, and antiasthmatic effects of BFU are reported to be present because of its alkaloid content.

5.5 Gastrointestinal Effects

Identified pharmacological effects of Fritillariae Thunbergii Bulbus include antiulcer and anti-diarrhea activities. The pharmacological studies demonstrate that F. thunbergii and its bulbs display anti-ulcer and anti-diarrhea effects, among a wide range of bioactivities. These findings originate from preclinical studies, and human clinical evidence for gastrointestinal indications is lacking.

5.6 Neuroprotective and Analgesic Effects

Pharmacological effects identified for Fritillariae Thunbergii Bulbus also include pain suppression and neuroprotection. The pharmacological studies demonstrate analgesic and neuroprotective effects for F. thunbergii. Again, these are based on preclinical evidence, and human clinical trials establishing efficacy for these indications have not been identified.

5.7 Antioxidant Activity

Modern pharmacological studies indicate that Fritillaria alkaloids also exert antioxidant and antimalarial effects. Valuable pharmacological effects documented for FRC and FRT include antioxidant effects.

5.8 Anti-Thyroid Activity and Regulation of Blood Rheology

Among the 13 pharmacological effects identified for Fritillariae Thunbergii Bulbus were anti-thyroid effects and regulation of blood rheology. These areas represent preliminary preclinical findings with no identified human clinical confirmation.

6. Body Systems and Health Areas Associated with Fritillary

• Respiratory system: Primary historical and scientific focus — cough suppression, mucociliary secretion (expectoration), bronchorelaxation, management of bronchitis, asthma, and pneumonia. F. cirrhosa, F. delavayi, F. wabuensis, and five other species, collectively named "Chuan Bei Mu," have evident ability to treat dry coughs without phlegm and chronic cough due to Yin deficiency.
• Oncological/cellular: Preclinical anticancer activity across multiple cell lines including lung, liver, colorectal, gastric, breast, and prostate cancer models.
• Cardiovascular system: ACE inhibition by key alkaloids; effects on blood pressure and cardiac rhythm (see safety section).
• Gastrointestinal system: Antiulcer and anti-diarrhea properties in preclinical models.
• Nervous system: AChE inhibition and neuroprotective activity in preclinical studies.
• Endocrine system: Anti-thyroid activity documented in preclinical settings.

7. Dosage Forms and Dosages Reported in Sources

The standard dose reported in traditional use ranges from 3–12 grams daily as a decoction (strong tea), or 1–1.5 grams as powder. Pills in equivalent doses are also available, and the herb may also be applied externally as either a powder or cream.

Fritillariae Cirrhosae Bulbus (FCB) is the primary raw material for over 210 Chinese patent medicines, and its annual demand can reach up to 5,000 tons.

Small, white, lobed bulbs that have been boiled or steamed and dried may also be available.

In scientific studies, specific dosages for individual alkaloids used in preclinical work include:

• In prostate cancer cell studies, appropriate doses of peimine (2.5, 5, and 10 μM) significantly inhibited the growth of prostate cancer cells.
• Peiminine in hepatocellular carcinoma (HepG2) cell studies had an IC50 of 4.58 μg/mL at 24 hours.
• Peiminine and sipeimine blocked hERG currents with IC50s of 36.8 ± 2.5 μM and 47.6 ± 9.8 μM respectively, close to that of peimine (26.1 ± 3.5 μM), as measured in patch-clamp studies.

Different drying methods for post-harvest processing affect alkaloid content: total peimine and peiminine content was preserved to the maximum with hot air drying at 60°C for F. thunbergii.

8. Safety Considerations

8.1 Toxicity of Raw Bulbs

Because the raw bulb is toxic, all medicinal forms are processed. Though the Bulbus of Fritillaria is considered of low toxicity, the toxicity has been scarcely researched. More experimental and clinical toxicity studies are needed, with a focus on the estimation of LD50, as well as the adverse effects of FTB at both low and high doses.

8.2 Cardiovascular Effects — hERG Channel Blockade

A particularly important safety signal relates to cardiac ion channels. Research has reported some potential off-target effects of "Bei Mu" due to peimine's blockade of hERG (human Ether-a-go-go-Related Gene) channels. This research investigated the modulatory effects of three major alkaloid analogs of "Bei Mu" and their cooperative effects on hERG channels using manual whole-cell patch-clamp techniques. The hERG channel is a voltage-gated K+ channel that plays an important role in the repolarization and duration of cardiac action potential. The malfunction of the hERG channel by drug blockage can lead to acquired long QT syndrome and life-threatening Torsades de pointes (TdP).

The antagonistic interactions of the three alkaloid analogs affect the overall effects of bioactive alkaloids in Fritillaria herbs. The antagonistic effects may reduce the blockade of hERG currents caused by individual alkaloids and lower the risk of severe cardiac dysfunction.

High-dosage intravenous injections of alkaloids isolated from fritillary produced pupil dilation, tremor, slowing of the heart rate, and lowered blood pressure in human subjects. Animal research has also demonstrated central nervous-system inhibition, including prolonged decrease in blood pressure, stimulation of the heart muscle, and dysfunction of breathing.

8.3 Subchronic Toxicology

In a 90-day subchronic toxicity study using ethanol extract of cultivated Fritillariae Cirrhosae bulbs administered orally to Sprague-Dawley rats, no mortality or clinical signs were observed throughout the experimental and recovery period in any of the groups. Although neutrophils (NEUT) significantly decreased during the drug delivery period (P < 0.05), it was normal in the satellite group. The neutrophil level was within the normal biological range. In consideration of neutrophils being a type of white blood cell, ANC and WBC in treated groups were not significantly changed (P > 0.05). The decrease in neutrophils was not considered an adverse change.

8.4 Pregnancy and Special Populations

Pregnant women should not use fritillary unless under the advice of a practitioner trained in the use of the herb. Formal human safety studies in pregnant or lactating women have not been identified in the peer-reviewed literature covered here.

8.5 Conservation and Authenticity Concerns

A practical safety and efficacy concern relates to adulteration and resource depletion. In 2012, the plants of BFC were classified as precious, rare, and threatened species by the Endangered Species Scientific Commission of China. Indiscriminate harvesting and illegal trade due to high market demand, as well as global warming, have put many species at risk of extinction; ex-situ propagation, artificial cultivation, and in vitro tissue culture are proposed as solutions for mass production and germplasm conservation.

A resource investigation performed in 32 traditional producing regions found that the wild resource of BFC is at the risk of depletion. There is great global demand for wild F. cirrhosa, which is traded in considerable quantities in China, Hong Kong, Taiwan, Canada, Malaysia, Singapore, Korea, and Europe.

8.6 Drug Interactions — Research Gaps

No interactions with standard pharmaceuticals have been described in the literature. Nonetheless, the documented hERG channel blockade by peimine and related alkaloids, ACE-inhibitory activity, and AChE-inhibitory properties suggest theoretical pharmacodynamic interactions with antiarrhythmic agents, antihypertensives, and cholinergic drugs, respectively. Formal pharmacokinetic drug interaction studies in humans have not been identified.

The pharmacological mechanisms of Bulbus of Fritillaria lack depth; the molecular mechanism and the structure-function relationship of alkaloids in Bulbus have been little researched.

9. Regulatory and Pharmacopeial Status

Various Fritillaria species have been recorded in the Pharmacopoeia of the People's Republic of China (1995, 2000, 2005, 2010, and 2015 editions) and are widely distributed across China. FRC and FRT medicines are described as two different entities in the Chinese Pharmacopoeia (Chinese Pharmacopoeia Commission, 2015); however, they share commonalities on a biological basis.

In terms of the China Pharmacopoeia 2020, the bulbs of F. cirrhosa, F. unibracteata, F. przewalskii, F. delavayi, F. wabuensis, and F. taipaiensis are sources of BFC.

Fritillary is not generally available in American health food stores, but processed forms are available at Chinese pharmacies and Asian groceries.

10. Summary of Evidence Strength

The overall body of evidence for fritillary as a medicinal substance can be characterized as follows:

• Antitussive and expectorant activity: The strongest preclinical evidence base. Multiple animal and in vitro studies consistently demonstrate cough suppression, bronchorelaxation, and mucus secretion by imperialine, verticine, verticinone, and related alkaloids. Human clinical evidence is limited. Bulbus Fritillariae (BF) is a Traditional Chinese Medicine treating cough and asthma.
• Anti-inflammatory activity: Consistent in vitro mechanistic evidence via NF-κB, COX-2, and nitric oxide pathway inhibition. Animal model confirmation exists. Human evidence is lacking.
• Anticancer activity: A growing body of in vitro and limited in vivo preclinical data across multiple cancer types. Molecular targets have been identified. No human clinical trials have been published to date for any oncological indication.
• Cardiovascular, neurological, endocrine, and gastrointestinal effects: Preliminary, largely preclinical. Human evidence is absent from the published peer-reviewed literature reviewed here.
• Safety profile: Characterized as of low toxicity in processed form, but formal systematic toxicology — including human LD50 data, long-term toxicity, and drug interaction studies — remains substantially underdeveloped. The hERG channel blockade by key alkaloids is a pharmacologically relevant signal requiring further investigation, particularly at high doses.

The crude herb FTB contains more than 100 chemical constituents in 11 categories with 13 possible pharmacological activities. Included studies revealed that these pharmacological activities may be mainly attributed to the alkaloids isolated from FTB. Its multiple compounds and effects may contribute to novel drug discovery for the management of multiple conditions.

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• The Pharmaceutical Research of Bulbus Fritillariae — Research & Reviews: Journal of Oncology and Immunology
• Biomod2 Modeling for Predicting the Potential Ecological Distribution of Three Fritillaria Species Under Climate Change — Scientific Reports, Nature
• Imperialine and Verticinone from Bulbs of Fritillaria wabuensis — Planta Medica, Thieme
• The Fritillaria Alkaloid Peiminine Acts as a Chemosensitizer to Potentiate Oxaliplatin Efficacy Against Gastric Cancer — ScienceDirect
• UHPLC-Q-Exactive Orbitrap MS/MS-Based Untargeted Metabolomics and Molecular Networking Reveal the Differential Chemical Constituents of the Bulbs and Flowers of Fritillaria thunbergii — PMC