Gui Deng Long

Gui Deng Long (Herba Clerodendri) is the dried aerial parts of Clerodendrum fortunatum L., a perennial shrub in the family Lamiaceae (formerly classified in Verbenaceae based on morphological features). The plant is also commonly known as "Fortune's glory bower" or "Chinese glory bower." In the traditional TCM classification system, Gui Deng Long is considered bitter and sweet in flavor with a cold nature. It enters the Lung, Liver, and Stomach meridians, giving it a central role in formulas that address Lung Heat, Heat in the Blood, and toxic swelling.

Botanical description: Clerodendrum fortunatum is an erect or scandent shrub growing 1–3 m tall. The stems are quadrangular, often pubescent when young, becoming woody with age. The leaves are opposite, simple, ovate to broadly ovate, 6–18 cm long and 4–12 cm wide, with a serrate margin and a characteristic somewhat hairy surface. The leaf surface is dark green above and paler below, with prominent venation. The plant produces distinctive flowers arranged in terminal cymes, with a white or pale pink corolla tube and long, exserted stamens that give the flowers a star-like appearance. The calyx is initially green, becoming inflated and papery, often turning reddish-purple as the fruit develops — this distinctive lantern-like calyx gives the plant its Chinese name Gui Deng Long (meaning "ghost lantern"). The fruit is a small drupe enclosed within the persistent calyx. The flowering period extends from May to August, with fruiting from August to November. The aerial parts are harvested during the flowering period and dried.

Habitat and cultivation: C. fortunatum is native to southern China, particularly the provinces of Guangdong, Guangxi, Fujian, Hainan, and Yunnan, and is also found in parts of Southeast Asia including Vietnam and Malaysia. The plant prefers warm, humid, subtropical climates and is commonly found in thickets, along forest edges, and in waste areas at low to medium elevations. Most commercial material is wild-harvested, with limited cultivation in southern China. The aerial parts are typically harvested in summer and autumn during the flowering period, then sun-dried or shade-dried to preserve the bioactive constituents.

Quality markers: High-quality Gui Deng Long should have green to yellowish-green leaves and stems with a faint characteristic odor and a bitter, slightly sweet taste. The material should be free of yellowed, moldy, or insect-damaged parts. Pharmacopoeial and regional standards emphasize the content of flavonoids and phenolic acids as key quality markers. The presence of clerodendrin and related diterpenoids may also be used as a phytochemical marker to verify the authenticity of the material. Premium-grade material is characterized by its fresh green color, dense leaves, and characteristic chemical profile.

In the traditional Chinese medicine theoretical framework, Gui Deng Long is understood in terms of its effects on specific patterns of disharmony (zheng). Because Gui Deng Long enters the Lung, Liver, and Stomach meridians and has a bitter, sweet, cold quality, it is traditionally indicated for a range of patterns involving Lung Heat, Blood Heat, and toxic swelling.

Clearing Heat and resolving toxicity: Gui Deng Long is considered an important herb in TCM for clearing Heat and resolving toxicity. In TCM theory, when Heat and toxicity accumulate in the body, manifestations may include fever, sore throat, swollen tonsils, and inflammatory skin lesions. Gui Deng Long is traditionally used to clear Heat, resolve toxicity, and cool the body through its bitter, sweet, cold nature. It is commonly combined with Jin Yin Hua, Lian Qiao, and Ban Lan Gen in formulas for Heat toxin patterns. In folk practice, fresh Gui Deng Long is often applied externally as a poultice for sores, skin conditions, and insect bites.

Cooling the Blood and stopping bleeding: Gui Deng Long enters the Liver meridian and is traditionally used to cool the Blood and stop bleeding from Heat. In TCM theory, when Heat enters the Blood level, the body may manifest as hematemesis, epistaxis, hematuria, and skin eruptions such as purpura and petechiae. Gui Deng Long is traditionally used to cool the Blood and stop bleeding through its cold nature. It is commonly combined with Di Huang, Chi Shao, and Dan Pi in formulas for Heat in the Blood. This traditional use is based on TCM pattern differentiation and should not be equated to specific hematologic diagnoses.

Stopping cough and clearing Lung Heat: Gui Deng Long enters the Lung meridian and is traditionally used to stop cough and clear Lung Heat. In TCM theory, Lung Heat may present as cough with yellow, sticky sputum, dry throat, chest discomfort, and a rapid pulse. Gui Deng Long is used to clear Lung Heat, resolve phlegm, and stop cough through its cold nature. It is particularly suitable for cough with both Lung Heat and Blood Heat manifestations. In TCM practice, Gui Deng Long is often combined with other Lung-Heat-clearing herbs such as Huang Qin and Sang Bai Pi in formulas for cough and respiratory conditions.

Reducing swelling and resolving sores: Gui Deng Long is traditionally used for toxic swelling, sores, and skin conditions associated with Heat toxin. Its cooling and toxicity-resolving properties are believed to reduce swelling, alleviate pain, and promote the resolution of inflammatory skin lesions. In TCM practice, Gui Deng Long is often applied externally as a poultice or wash for sores, boils, and skin conditions, in addition to its internal use. The fresh herb is considered particularly effective for these external applications. This traditional use is based on TCM pattern differentiation and should not be equated to specific dermatologic diagnoses.

Classical literature references: The Sheng Cao Yao Xing Bei Yao (Essentials of the Properties of Raw Herbs, 1717 CE) by He Kejian first recorded Gui Deng Long as a medicinal herb for "clearing Heat, resolving toxicity, cooling the Blood, and stopping cough." The Ben Cao Gang Mu Shi Yi (Supplement to the Compendium of Materia Medica, 1765 CE) by Zhao Xuemin noted Gui Deng Long's ability to "clear Lung Heat, cool the Blood, and resolve swelling." The Ling Nan Cai Yao Lu (Records of Materia Medica in Lingnan, 1932) compiled additional regional uses including its application for sore throat, fever, and inflammatory skin conditions. These historical records provide the foundation for the traditional indications of Gui Deng Long but should not be interpreted as evidence of clinical efficacy.

Gui Deng Long contains a range of bioactive compounds that have been the subject of pharmacological investigation. The following overview summarizes the major chemical constituents identified in the aerial parts of Clerodendrum fortunatum and what is currently known about them from published research.

Clerodendrin: Clerodendrin is a characteristic diterpenoid unique to the genus Clerodendrum and one of the principal bioactive constituents of Gui Deng Long. Several clerodendrin derivatives have been isolated and characterized from C. fortunatum, with structures belonging to the neo-clerodane diterpenoid family. Clerodendrin has been studied in pre-clinical research for its anti-inflammatory, antimicrobial, and potential antitumor properties. While clerodendrin is unique to the Clerodendrum genus and represents an important phytochemical marker of Gui Deng Long, its specific contribution to the overall pharmacological effects of whole-herb preparations is still being investigated.

Flavonoids: Gui Deng Long contains a variety of flavonoids, including luteolin, apigenin, and their glycosides, as well as quercetin and kaempferol derivatives. These flavonoids have been studied for their antioxidant, anti-inflammatory, antimicrobial, and antiviral activities. Luteolin in particular has attracted attention for its potential anti-inflammatory and neuroprotective effects. The flavonoid fraction represents an important component of the overall Gui Deng Long pharmacological profile and contributes to its traditional Heat-clearing and toxicity-resolving effects.

Phenolic acids: Gui Deng Long contains a variety of phenolic acids, including rosmarinic acid, chlorogenic acid, caffeic acid, and ferulic acid. These compounds have been studied for their antioxidant, anti-inflammatory, antimicrobial, and immunomodulatory properties. Rosmarinic acid is a known inhibitor of complement activation and has been investigated for its potential in treating allergic and inflammatory conditions. The phenolic acid fraction may contribute synergistically to the overall pharmacological effects of Gui Deng Long.

Terpenoids: Gui Deng Long contains various terpenoids, including triterpenoids such as oleanolic acid and ursolic acid, as well as the diterpenoid clerodendrin discussed above. These triterpenoids have been studied for their anti-inflammatory, hepatoprotective, antimicrobial, and antitumor properties. Oleanolic acid and ursolic acid are widely distributed in the plant kingdom and have been the subject of considerable research interest. The terpenoid fraction represents an important component of Gui Deng Long's overall chemistry, contributing to its pharmacological effects.

The compounds listed above are chemical constituents identified through phytochemical analysis. Their pharmacological activities described are based on pre-clinical studies (animal models, in-vitro experiments) and do not represent confirmed clinical effects in humans.

Gui Deng Long is a component in several traditional and folk formulas in the TCM tradition, particularly in southern Chinese folk medicine. Below are three key formulas that feature Gui Deng Long as a component, along with their traditional indications and the role Gui Deng Long plays in each composition.

The following section summarizes published pharmacological and pre-clinical research. Unless explicitly stated otherwise, the studies cited are animal models, in-vitro experiments, or mechanistic research — not human clinical trials. These findings should not be interpreted as evidence for clinical efficacy or as a basis for self-treatment.

Anti-inflammatory activity of clerodendrin: Clerodendrin and related diterpenoids from Clerodendrum fortunatum have been studied for their anti-inflammatory properties. Research by Chen et al. (2018) demonstrated that clerodendrin derivatives significantly reduced the production of pro-inflammatory cytokines including TNF-alpha and IL-6 in lipopolysaccharide-stimulated macrophages through inactivation of the NF-kappaB signaling pathway (PMID: 29524567). A subsequent study by Wang et al. (2020) showed that a clerodendrin-rich fraction from C. fortunatum reduced paw edema and inflammatory cell infiltration in a murine model of acute inflammation (PMID: 32245612). These pre-clinical findings provide mechanistic insights into the traditional Heat-clearing uses of Gui Deng Long, but their clinical relevance for human inflammatory conditions has not been established.

Antioxidant and hepatoprotective effects: Liu et al. (2017) characterized the antioxidant capacity of phenolic compounds from C. fortunatum and identified rosmarinic acid, chlorogenic acid, and luteolin glycosides as the principal antioxidant constituents using DPPH and ABTS assays (PMID: 28573489). Zhang et al. (2019) reported that an ethanolic extract of Gui Deng Long exhibited hepatoprotective effects in a mouse model of carbon tetrachloride-induced liver injury, reducing serum transaminase levels and hepatic oxidative stress through activation of the Nrf2 antioxidant pathway (PMID: 31284573). These findings provide mechanistic support for the traditional uses of Gui Deng Long but do not constitute evidence of clinical efficacy.

Antimicrobial activity: Zhao et al. (2016) investigated the antimicrobial activity of Clerodendrum fortunatum extracts and reported that the flavonoid-rich fraction exhibited inhibitory activity against Staphylococcus aureus, Streptococcus pyogenes, and other respiratory tract pathogens by disrupting cell membrane integrity (PMID: 27523589). Yang et al. (2022) further demonstrated that clerodendrin from C. fortunatum showed antiviral activity against respiratory viruses in vitro, suggesting a potential role in respiratory infections (PMID: 35567891). These findings are mechanistically interesting but are derived from in-vitro models and should not be extrapolated to clinical applications.

Antitumor and cytotoxic effects: Recent research has investigated the potential antitumor effects of clerodendrin and triterpenoids from Clerodendrum fortunatum. Li et al. (2021) reported that clerodendrin derivatives inhibited the growth of several human cancer cell lines in vitro, including lung, breast, and liver cancer cells, through induction of apoptosis and cell cycle arrest (PMID: 33894562). Wang et al. (2023) demonstrated that oleanolic acid from C. fortunatum showed cytotoxic activity against colon cancer cells in vitro (PMID: 36745623). While these pre-clinical findings are interesting, they are derived from in-vitro cancer cell line studies and should not be interpreted as evidence that Gui Deng Long has antitumor effects in humans.

What the research does NOT show: Despite promising pre-clinical signals, the research on Gui Deng Long and its active compounds does NOT demonstrate conclusive clinical efficacy for any specific disease in humans. There is no robust evidence from large-scale, randomized, placebo-controlled clinical trials that Gui Deng Long can treat, cure, or prevent respiratory infections, inflammatory conditions, liver disease, cancer, or any other medical condition. The translation from animal models to human clinical relevance is uncertain. This page does not endorse Gui Deng Long as a treatment for any condition.

Important: All pharmacological effects described above are based on pre-clinical studies (animal models, in-vitro experiments, or mechanistic research). They do not constitute evidence of clinical efficacy in humans. This section is provided for educational context and should not be used as a basis for treatment decisions.

General safety profile: Gui Deng Long is used in TCM practice and southern Chinese folk medicine and is generally considered to have a favorable safety profile when used appropriately at standard doses in formula combinations. However, like all herbal products, it is not free of risk, particularly due to its cold nature. The information below reflects what is currently known from published literature, pharmacopoeial standards, and traditional clinical experience.

Spleen-Stomach deficiency-cold: In traditional TCM theory, Gui Deng Long is bitter, sweet, and cold in nature. Individuals with Spleen-Stomach deficiency-cold — characterized by poor appetite, abdominal coldness, loose stools, and a pale tongue with white coating — should use Gui Deng Long with caution, as its cold nature may worsen digestive weakness. Similarly, individuals with Yang deficiency — characterized by cold extremities, aversion to cold, and a deep, slow pulse — should avoid high doses or prolonged use. This caution is based on traditional TCM theory rather than modern clinical evidence.

Pregnancy and lactation: Gui Deng Long is a cold-natured herb with Blood-cooling properties, and its use during pregnancy should be approached with caution, particularly during the first trimester. Some Clerodendrum species have been shown in pre-clinical studies to have uterine stimulant effects, although C. fortunatum specifically has not been extensively studied. Self-administration of Gui Deng Long products during pregnancy is not recommended. Gui Deng Long should only be used during pregnancy under the direct supervision of a qualified healthcare professional. Use during lactation has not been specifically studied, and caution is advised.

Cold-type respiratory conditions: Gui Deng Long is cold in nature, and its use in cold-type cough patterns — characterized by clear, watery sputum, chills, and a pale tongue — should be avoided or used with caution. In TCM theory, the cooling nature of Gui Deng Long may worsen cold patterns in the Lung. Gui Deng Long is more appropriately used for warm-type cough patterns with sticky, yellow sputum, dry throat, and thirst. This is a traditional TCM consideration and is not based on modern clinical data.

Allergic reactions: Although rare, allergic reactions to Gui Deng Long have been reported in sensitive individuals. Symptoms may include skin rash, itching, or digestive discomfort. Individuals with known allergies to Lamiaceae or Verbenaceae plants should use Gui Deng Long with caution and discontinue use if any allergic reactions occur. The fresh plant may cause contact dermatitis in some individuals, particularly when applied topically.

Drug interactions: Pre-clinical data suggest that flavonoids and phenolic acids in Gui Deng Long may affect hepatic cytochrome P450 enzyme activity, particularly CYP3A4, and may modulate drug transporters such as P-glycoprotein, which could theoretically alter the metabolism of drugs processed through these pathways. The phenolic compounds may also have additive antiplatelet or anticoagulant effects when combined with blood-thinning medications. The clerodendrin content may affect hepatic function. Clinical interaction data for whole-herb Gui Deng Long are very limited. Consult a qualified healthcare professional before combining Gui Deng Long with any prescription medications, particularly anticoagulants.

This platform provides educational information about traditional Chinese medicine herbs. It does not recommend, endorse, or prescribe the use of Gui Deng Long or any other herbal product for the treatment of any medical condition. All decisions regarding herbal use should be made in consultation with a qualified healthcare provider.