Calotropis gigantea

Calotropis gigantea (Giant Milkweed / Crown Flower)

1. Identity and Botanical Classification

Nomenclature and Taxonomy

Calotropis gigantea (L.) R. Br., commonly known as giant milkweed, is a member of the Apocynaceae (formerly Asclepiadaceae) family of latex-producing plants. It is well known in traditional medicine by the common name "milkweed," and has been used in Unani, Ayurvedic, and Siddha systems of medicine for many years. In Ayurvedic classical literature, it is referred to as Arka, and in Sanskrit as Sweta Arka (white Arka). In Hindi, it is called "Madar" and is also known as the "Crown Flower." Other regional and common designations include Biduri in Indonesia.

Geographic Distribution and Botanical Description

Calotropis gigantea Linn. is a perennial shrub native to South and Southeast Asia, where its stems, leaves, fruits, and latex are used to treat a wide range of ailments. Commonly referred to as "milkweed," this plant is native to China, Malaysia, and India and is found practically everywhere in the world. It is indigenous to Bangladesh, India, and Thailand in South and Southeast Asia.

It is a huge, gregarious shrub with many branches and young branches covered in white, cottony hairs. This plant features clusters of white or lavender waxy blossoms, an oval-shaped, light green leaf, and a milky stem. It has milky latex throughout all of its plant parts.

In Ayurveda, the plant drug Arka has been equated with three botanical sources: Calotropis procera, Calotropis gigantea, and Calotropis acia. Although these two species are closely related and share many phytochemical and pharmacological features, they are pharmacologically distinct. Between the two species of plants, Calotropis procera is considered the most poisonous, as it possesses the highest amounts of cardiac glycosides, mainly in the latex and roots, although C. gigantea should still not be regarded as safe since it can lead to serious cardiotoxicity.

Plant Parts Used and Preparation Forms

A variety of illnesses may be treated with the help of this plant's parts, including its roots, bark, latex, leaves, and flowers. Each part contains a distinct phytochemical profile and is traditionally prepared and used differently:

• Root bark contains β-amyrin, giganteol, isogiganteol, and cardenolides.
• Flowers contain α- and β-calotropeol, amyrin, glycosides, mudarin, and asclepine.
• Leaves contain sapogenins, calotropin, uscharin, calotoxin, alkaloids, and mudarin.
• Latex contains calotoxin, calactin, calotropin, uscharin, α- and β-calotropol, and calcium oxalate.
• Seeds contain palmitic acid, oleic acid, linoleic acid, linolenic acid, stigmasterol, and phytosterol.

Preparations reported in the scientific literature include ethanolic extracts, aqueous extracts, chloroform extracts, methanol extracts, ethyl acetate fractions, and ointments formulated with powdered plant material. Plant parts such as roots, root bark, flowers, fresh leaves, and inspissated juice were widely used in formulations along with other plants and minerals.

Latex and root are the major parts used internally. The latex of Arka has been profoundly used in 115 formulations indicated for pyrexia (Jvara) and skin disorders (Kushtha).

2. Traditional and Historical Use

Ayurveda (India)

Though Calotropis gigantea is chiefly found in wastelands, its wide usage for various ailments dates back to the 10th century in India. Reports from the Traditional Knowledge Digital Library are evident that it has been used in Indian systems of medicine like Ayurveda, Siddha, and Unani formulations.

Both plants have therapeutic value and are ingredients in various Ayurvedic formulations referred to in classical texts like the Charak Samhita and Sushruta Samhita. In Ayurveda it is used for ailments such as leprosy, pruritis, piles, worm infestation, cough, and splenic, abdominal, and nervous disorders.

Traditionally, the powdered root is used to treat bronchitis, asthma, leprosy, eczema, and elephantiasis, while the latex is used to treat vertigo, baldness, hair loss, toothache, intermittent fevers, rheumatoid/joint swellings, and paralysis.

Being a plant enlisted under the poisonous group of drugs in classical Ayurveda, the internal application of Arka is not practiced randomly, and a single comprehensive account of its internal applications in classical formulations is not easily available. A critical review of 60 classical Ayurvedic texts dealing with treatises, compendia, and books of Rasashastra identified 547 internal applications across almost 48 texts.

The Ayurvedic preparation Swarnabhasma, which contains Calotropis gigantea, is extensively used by Ayurvedic physicians for treatment of diabetes mellitus, bronchial asthma, rheumatoid arthritis, and nervous disorders.

Siddha and Unani Systems

In Siddha medicine, it is used for treating diseases of vatam and kapam, poisonings from rat and snake bite, leprosy, convulsions, swelling in joints, worm infestations, skin diseases, and dyspnoea. In Unani medicine, it is used to treat piles, aches, worms, skin diseases, paralysis, asthma, and dropsy.

Cultural and Ritual Uses

Flowers of Calotropis gigantea are offered to the Hindu gods Shiva, Ganesha, and Hanuman. The flowers are long lasting, and in Thailand they are used in floral arrangements.

Traditional External Applications

Ancient peoples used the C. gigantea latex for various activities, including anti-inflammation and stopping bleeding from fresh incisions. The leaf extract was mixed with rock salt and oils for earaches, and freshly heated leaves were used for rheumatic aches. Scabies was treated by applying warm root juice heated with coconut oil.

In the Siddha, Unani, and Ayurvedic systems, the plant is known as toxic, highlighting its dual nature as a potent and hazardous herb despite its numerous health benefits.

3. Key Constituents and Active Compounds

Cardenolides (Cardiac Glycosides)

Phytochemical analyses have identified 98 metabolites in C. gigantea, with cardenolides such as calotropin, calotoxin, and uscharin being especially abundant. These molecules exhibit potent bioactivity.

Known cardenolides produced by Calotropis gigantea include calactin, calotoxin, calotropin, frugoside, and gofruside. Cardenolides are C23 steroids with a butenolide ring at C-17, and are synthesized in plants from mevalonic acid via phytosterol and pregnane intermediates.

Sixteen cardiac glycosides, including five previously undescribed compounds, have been extracted and purified from whole plants of Calotropis gigantea; spectroscopic data and electronic circular dichroism (ECD) analyses were used to determine their structures. Notably, calogiganin C is the first naturally occurring example of a cardenolide containing a 7-membered lactone in ring A.

Calotropin is identified as a highly potent cardenolide that has a similar chemical structure to cardiac glycosides such as digoxin and digitoxin.

Other Phytochemical Classes

Phytochemical constituents of the plant responsible for its pharmacological activities include alkaloids, triterpenoids, flavonoids, saponins, steroids, alcohol, fatty acids, esters of calotropeols, glycosides, and proteases. Bioactive constituents confirmed in leaf extracts include alkaloids, saponins, tannins, flavonoids, terpenoids, cardiac glycosides, and quinones.

A wide range of isolated compounds include alkaloids, tannins, resins, flavonoids, terpenoids, cardiac glycosides, and specific chemical entities such as giganteol, α- and β-calotropeol, β-amyrin, and isogiganteol.

The presence of high amounts of bioactive compounds, which include tannins, flavonoids, triterpenoids, and steroids in the latex, has long been recognized. Peptides and proteins such as peroxidases, peptidases, protease inhibitors, osmotins, lysozymes, and chitinases are all well-studied enzymes associated with the defense system of Calotropis plants against herbivores and diseases.

Secondary metabolite UHPLC-MS characterization indicates the tentative presence of 17 different phytocompounds in leaf extracts, mostly derivatives of sesquiterpene, alkaloids, and flavonoids.

Mechanisms of Action of Key Constituents

Calotropin inhibits the Na⁺/K⁺-ATPase at its alpha-subunit, which causes a rise in intracellular calcium levels and the breakdown of ion homeostasis in cancer cells as one of its main modes of action.

While cardenolides have previously been used as clinical drugs for congestive heart failure, they have recently been found to selectively inhibit cancer cells through the induction of apoptosis via complex cell signal transduction pathways associated with the Na⁺/K⁺-ATPase.

Research on colon cancer cells has identified calotropin as an anticancer agent that inhibits the Wnt signalling pathway by decreasing nuclear and cytosolic β-catenin in a dose-dependent manner, leading to degradation of β-catenin. Other mechanisms reported for the anticancer effect of constituents of Calotropis extract in colorectal cancer cells include inhibition of the Wnt signaling pathway, downregulation of cyclin-dependent kinase-4 expression, and dephosphorylation of Akt, which induces autophagy and senescence in cancer cells.

The proteins of Calotropis gigantea have been shown to suppress breast tumor growth through suppression of the NF-κB pathway.

Poisonous cardenolides cause serious cardiac failure by blocking the Na⁺/K⁺-ATPase pump, which interferes with ion transport across cell membranes.

Calotropin also acts as a procoagulant, aiding in the blood clotting process during wound formation, and can additionally hydrolyze blood clots, promoting smoother blood circulation in the wound area.

4. Scientific Evidence by Area of Use

4.1 Anticancer Activity

Evidence level: Predominantly preclinical (in vitro and in vivo animal models). No human clinical trials published.

A number of cardenolides, such as uscharin, calactin, calotropin, and calotoxin, have been isolated from this plant and shown to exhibit anticancer activity. Calotropin is a cardiac glycoside derived from Calotropis gigantea that has demonstrated anti-proliferative effects against various types of cancer cells, including lung, breast, prostate, leukemia, and colon.

In Vitro Studies (Cell Lines): The cytotoxic activities of sixteen isolated cardenolides were evaluated against A172, U251, AGS, PANC-1, HepG2, HCT116, and NCI-H226 cell lines. Four of these compounds exhibited potent growth inhibitory activity. Notably, uscharidin and calotropin showed pronounced cytotoxicities at low nanomolar concentrations against A172 and U251 (glioblastoma) cells, and cell death mechanism studies showed that these two compounds induced G2/M cell cycle arrest.

Colon Cancer: The anticancer activity of C. gigantea stem bark extract, both alone and in combination with 5-fluorouracil (5-FU), was evaluated in colorectal cancer (CRC) cells. A crude ethanolic extract was prepared from dry, powdered C. gigantea bark using 95% ethanol and partitioned to obtain dichloromethane, ethyl acetate, and water fractions. A combination of 5-FU and the dichloromethane fraction of the C. gigantea stem bark extract exhibited enhanced potency in the induction of apoptosis in HCT116 cells, and lower toxicity in normal human fibroblast cells, compared with either agent used alone, suggesting potential for use in combination with chemotherapeutic regimens.

Breast Cancer: A study examined the effect of Calotropis gigantea methanolic extract (CGME) on growth and apoptosis in the human breast carcinoma cell line (MCF-7). Treatment with CGME caused the accumulation of phosphatidylserine on the cell membrane, recruitment of poly-caspases, DNA fragmentation, and enhanced transcription of pro-apoptotic gene expression in human breast carcinoma cells.

Oral Cancer: Calotropin, obtained from Calotropis gigantea, was investigated for anti-cancer properties against HSC-3 oral squamous cancer cells. Flow cytometry analysis revealed that calotropin induced G0/G1 phase cell cycle arrest and apoptosis in HSC-3 cells. Calotropin also displayed inhibitory properties against aerobic glycolysis, and migration and invasion assays indicated its ability to reduce the migratory and invasive capacity of HSC-3 cells.

However, as of multiple literature reviews, no clinical trials had been reported on the plant in humans, representing a major limitation in translating these preclinical results.

4.2 Anti-inflammatory Activity

Evidence level: Preclinical (animal models and in vitro). No human clinical data.

The methanolic extract of C. gigantea leaves has been reported to possess strong anti-inflammatory and antioxidant activities. Herbal remedies based on C. gigantea have been explored for potential use in chronic inflammatory illnesses such as rheumatoid arthritis and leprosy. Pharmacological studies using rodent models of inflammation have substantiated ethnomedical claims, but no controlled human trials have been published.

Alkaloids present in C. gigantea possess antibacterial properties, which can disrupt the formation of bacterial cell layers, and also exhibit analgesic and astringent properties capable of alleviating pain in the wound area.

4.3 Wound Healing

Evidence level: Animal models (in vivo, rats). No published human clinical trials.

To investigate wound healing activity of Calotropis gigantea root bark in rats, Wistar albino rats weighing between 180 and 200 g were topically treated with extract formulated in ointment by using simple ointment BP as base, with 5% (w/w) ointment applied once daily in excision wound models.

Topical application of Calotropis gigantea in the excision wound model increased the percentage of wound contraction. Scar area and epithelization time were decreased. The ethanolic extract was given orally at doses of 100, 200, and 400 mg/kg in incision and dead space wound healing models; in these models, breaking strength of wounds and hydroxyproline content were increased. The authors concluded that C. gigantea accelerated wound healing in rats and thus supports its traditional use.

A separate study using the ethanolic extract of leaves reported significant improvement in wound healing in both excision and incision wound models at doses of 0.5% w/w (p < 0.001) and 2.0% w/w (p < 0.01) on the 16th day.

C. gigantea has demonstrated ability to enhance wound healing through mechanisms including astringency, antibacterial activity, promotion of haemostasis, facilitation of collagen synthesis, enhancement of re-epithelialization, and stimulation of cell proliferation via its phytochemical constituents. However, due to the scarcity of recent human studies, the plant's true clinical efficacy in wound healing remains unclear.

C. gigantea flower extract contains flavonoids that play a role in enhancing collagen survival, preventing cell damage, promoting DNA synthesis, and preventing wound infections. The extract also contains alkaloids that stimulate proliferation agents and collagen production, and saponins that increase tensile strength.

4.4 Antimicrobial Activity

Evidence level: In vitro only. No human clinical data.

Methanol, ethyl acetate, and aqueous fractions of C. gigantea leaf extracts showed maximum inhibition of antibacterial activity against all Gram-positive and Gram-negative strains tested, while antifungal activity was also observed across all fractions against all fungal strains tested, showing promising inhibition.

The latex of C. gigantea has been shown to have wound healing effects in rats comparable to those of nitrofurazone, and the extract contains high content of glycosides, flavonoids, phenolic, and triterpenoid compounds with antimicrobial and antioxidant properties.

4.5 Antidiabetic / Hypoglycemic Activity

Evidence level: Animal models (rodents). No human clinical trials.

To evaluate the hypoglycemic and anti-diabetic activity of Calotropis gigantea, chloroform extracts of leaves and flowers were tested in normal rats and in streptozotocin-induced diabetic rats at doses of 10, 20, and 50 mg/kg orally.

The leaf and flower extracts were effective in lowering serum glucose levels in normal rats. Improvement in oral glucose tolerance was also registered. Administration of leaf and flower extracts to streptozotocin-induced diabetic rats showed a significant reduction in serum glucose levels. The authors concluded that chloroform extracts of Calotropis gigantea leaves and flowers have significant anti-diabetic activity.

Administration of chloroform extracts of C. gigantea leaf and flower to streptozotocin-induced diabetic rats at doses of 10, 20, and 50 mg/kg orally for 27 days led to a significant decrease in lipid peroxidation, serum liver enzyme levels, alkaline phosphatase, cholesterol, and triglyceride levels, while superoxide dismutase and catalase levels were significantly increased.

With respect to mechanism, speculative pathways include increased glucose uptake or partial mediation through suppression of gluconeogenic enzymes such as glucose-6-phosphatase, though the precise mechanism(s), site(s) of activity, and active constituent(s) remain to be determined.

4.6 Analgesic Activity

Evidence level: Animal models (mice and rats). No human clinical data.

The alcoholic extract of the flowers of Calotropis gigantea was administered orally and explored for its analgesic activity in chemical and thermal models in mice. In the acetic acid-induced writhing test, an inhibition of 20.97% and 43.0% in the number of writhes was observed at the doses of 250 and 500 mg/kg, respectively. In the hot plate method, the paw licking time was delayed. The analgesic effect was observed after 30 min of dose administration and reached its maximum after 90 min.

In a study assessing the analgesic potential of dry latex (DL) from C. gigantea, DL at a dose of 415 mg/kg against acetic acid-induced writhing was found more pronounced in effect than an oral dose of aspirin (100 mg/kg). In the tail-flick model, DL at 830 mg/kg caused negligible analgesia comparable to aspirin.

4.7 Antioxidant Activity

Evidence level: In vitro and animal models. No human clinical data.

All tested extracts of C. gigantea leaves contained significant amounts of total phenolics and total flavonoids. DPPH (free radical scavenging) activity was maximum in the methanolic aqueous fraction, followed by n-hexane, ethyl acetate, chloroform, and n-butanol fractions. The ethanolic leaf extract also exhibited considerable inhibitory effects on tyrosinase (81.72 mg KAE/g extract), while showing weak inhibition of other tested enzymes.

4.8 Anticonvulsant Activity

Evidence level: In vivo animal studies. Ethnopharmacological documentation from traditional healers.

An infusion of flowers was reported for the prevention of seizures in three different communities of traditional healers in India. Leaves, crushed roots, and stems of Calotropis gigantea were assessed in in vivo models of epilepsy (PTZ and MES), with phenytoin used as control. A decrease in the number and duration of seizures, and an increase in latency of seizures, was observed. No toxicity was observed at the doses used in the study, and overall the evidence presents in vivo evidence of anticonvulsant activity.

4.9 Antidiarrheal Activity

Evidence level: Animal studies only.

Plant extracts at 200 and 400 mg/kg IP significantly (p < 0.001) suppressed weight and volume of intestinal content in a manner similar to atropine (3 mg/kg IP), and there were significant decreases in faecal output and frequency of droppings compared to control rats. The roots of Calotropis gigantea have been used in leprosy, eczema, syphilis, elephantiasis, ulceration, antidiarrhoeal conditions, and cough in the Indian system of traditional medicine.

5. Body Systems and Health Areas Associated with Calotropis gigantea

The plant is reported as effective in treating skin, digestive, respiratory, circulatory, and neurological disorders, and was used to treat fevers, elephantiasis, nausea, vomiting, and diarrhea. Pharmacological studies have shown that the active ingredients in C. gigantea exhibit a wide range of effects, including analgesic, anthelmintic, astringent, anti-inflammatory, wound-healing, sedative, anti-asthmatic, antimicrobial, antioxidant, procoagulant, hepatoprotective, hypoglycemic, and abortifacient activities.

• Integumentary / Dermatological: Wound healing, leprosy, scabies, skin disorders, eczema, hair loss. Latex is utilized to treat different types of skin disorders.
• Oncology (experimental): Calotropis gigantea produces specialized secondary metabolites known as cardenolides, which have anticancer and antimalarial properties.
• Endocrine/Metabolic: Hypoglycemic effects studied in animal models of diabetes.
• Musculoskeletal: Traditional use in joint swellings, rheumatism, arthritis.
• Respiratory: Traditional use in asthma, bronchitis, dyspnoea.
• Gastrointestinal: Antidiarrheal, purgative, anti-bilious uses. The milky juice of Calotropis gigantea has been reported as a violent purgative and gastrointestinal irritant and used for inducing abortion.
• Neurological: Traditional use in paralysis, convulsions; in vivo anticonvulsant evidence.
• Hepatic: Traditional and experimental hepatoprotective evidence in animal models.

6. Dosage Forms and Reported Doses

No standardized pharmaceutical dosage has been established for Calotropis gigantea, and the following doses derive exclusively from experimental studies in animal models or from traditional formulation records. No human clinical dose-ranging studies have been published.

• Anti-diabetic activity (rodent studies): Chloroform extract of Calotropis gigantea leaf and flower at 10, 20, and 50 mg/kg, orally.
• Wound healing — oral (rodent studies): Ethanolic extract given orally at doses of 100, 200, and 400 mg/kg in incision and dead space wound healing models.
• Wound healing — topical (rodent studies): Significant improvement in wound healing observed at doses of 0.5% w/w (p < 0.001) and 2.0% w/w (p < 0.01) on the 16th day of application.
• Analgesic — alcoholic flower extract (murine studies): Alcoholic extract of flowers of Calotropis gigantea administered orally; inhibition of writhing observed at 250 and 500 mg/kg in mice.
• Analgesic — dry latex (murine studies): Dry latex at a dose of 415 mg/kg had more pronounced effect on acetic acid-induced writhing than oral aspirin (100 mg/kg); at 830 mg/kg, negligible analgesia was observed in the tail-flick model.
• Antidiarrheal (rodent studies): Extracts at 200 and 400 mg/kg IP significantly suppressed intestinal content.
• Anti-cancer (in vitro): MCF-7 breast cancer cells were treated with CGME at concentrations of 0, 5, 10, 20, 40, and 60 μg/ml for 24 hours. Calotropin showed potent cytotoxicity at an IC₅₀ of 15 ng/ml.

7. Safety Considerations

Inherent Toxicity of the Whole Plant

All parts of the plant are toxic; there are many case reports of gastrointestinal, cutaneous, and ocular toxicity with Calotropis. The plant contains cardenolide glycosides that have digoxin-like effects and can cause severe cardiotoxicity.

Although C. gigantea exhibits diverse pharmacological activities, its safety profile requires careful evaluation, particularly because many of its major constituents are cardenolides, compounds known for their narrow therapeutic window and significant risk of cardiotoxicity.

Cardiac Toxicity

All parts of the plant are toxic, with multiple case reports of gastrointestinal, cutaneous, and ocular toxicity. The plant contains cardenolide glycosides with digoxin-like effects and can cause severe cardiotoxicity. A case report documents a patient who developed cardiovascular collapse after oral ingestion and cutaneous application of Calotropis following treatment by a traditional healer for a snake bite.

A study in rats and sheep has shown that Calotropis ingestion is associated with cardiotoxicity. Sheep developed tachycardia and arrhythmias within 4 hours of ingestion of the leaves.

The same study on rats given escalating doses of Calotropis latex revealed that rats given 1 ml/kg of latex expired within 2 hours of ingestion, and necropsy of these animal models showed sub-endocardial hemorrhages, multifocal coagulation, and necrosis of cardiac muscle fibers.

Cutaneous and Ocular Toxicity

Animal model research has shown that consuming Calotropis gigantea extracts can cause tissue damage, arrhythmias, and cardiotoxicity. Eye and cutaneous toxicity have been linked to latex exposure. Accidental eye exposure to Calotropis latex occurs frequently, especially among people who work in flower farming.

Gastrointestinal Effects

Ingestion of latex usually leads to quick irritation of the mucous membranes, while ingestion of leaves or flowers is more likely to cause systemic effects, particularly cardiotoxicity, in a delayed manner.

Abortifacient / Reproductive Effects

The milky juice of Calotropis gigantea has been reported as a violent purgative and gastrointestinal irritant and used historically for inducing abortion. Pregnancy-interrupting properties have been identified among its pharmacological activities.

Narrow Therapeutic Window and Drug Interaction Risk

Because calotropin has a similar chemical structure to cardiac glycosides such as digoxin and digitoxin, there is an implied risk of pharmacodynamic interaction with any co-administered cardioactive medications. The digoxin-like mechanism of cardenolides means that any preparation of C. gigantea is likely to carry risks analogous to digitalis toxicity, including effects on heart rate and rhythm. Many of its major constituents are cardenolides, compounds known for their narrow therapeutic window and significant risk of cardiotoxicity.

Hemolytic Potential

Results of phytopharmacological investigation indicate that organic fractions of C. gigantea exhibited reduced hemolytic activity in the tested conditions, suggesting an enhanced medicinal potential and decreased toxicity of extracts compared to crude plant material. Nevertheless, hemolytic risk has been identified as a potential toxicological endpoint requiring evaluation.

Absence of Clinical Safety Data

As of the most recent literature, there are no published randomized controlled trials or systematic pharmacovigilance datasets establishing safe human doses of any standardized Calotropis gigantea extract. To assess the safety and effectiveness of medications based on Calotropis gigantea for use in humans, additional study is necessary to clarify the underlying mechanisms of action. More studies into its pharmacological characteristics may lead to the creation of innovative medications and efficient treatments for a range of illnesses.

References

• Advances in Calotropis gigantea Linn.: from phytochemistry and biological activities to diverse applications — ScienceDirect (2026)
• Phytochemistry and Pharmacology of Calotropis gigantea — An update | Indian Journal of Biochemistry and Biophysics (IJBB)
• An updated pharmacological insight into calotropin as a potential therapeutic agent in cancer — PMC (Front Pharmacol. 2023)
• Calotropis gigantea stem bark extract induced apoptosis related to ROS and ATP production in colon cancer cells — PMC / PLOS ONE (2021)
• Cytotoxic cardenolides from Calotropis gigantea — PubMed (Phytochemistry, 2021)
• Unveiling the anti-cancer mechanisms of calotropin: Insights into cell growth inhibition, cell cycle arrest, and metabolic regulation in HSC-3 cells — PMC
• The Calotropis Gigantea Methanolic Extract Induces Apoptosis in Human Breast Carcinoma Cells — PMC (2019)
• Genome Assembly and Annotation of the Medicinal Plant Calotropis gigantea, a Producer of Anticancer and Antimalarial Cardenolides — PMC (2018)
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• Wound healing activity of Calotropis gigantea root bark in rats — PubMed (J Ethnopharmacol, 2009)
• Hypoglycemic Effect of Calotropis gigantea Linn. Leaves and Flowers in Streptozotocin-Induced Diabetic Rats — PMC (Oman Med J, 2011)
• Free Radical Scavenging Activity of Calotropis gigantea on Streptozotocin-Induced Diabetic Rats — PMC (Indian J Pharm Sci, 2009)
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• Calotropis gigantea — an overview | ScienceDirect Topics
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• Calotropis gigantea — Wikipedia