The monograph of crud drug or monograph of Andrographispaniculata(kalomegh)

Plant: Andrographispaniculata(kalomegh)

The  Monograph  Is  given  below:-

·         Definition:Andrographispaniculata  is a medicinal plant which consists of the dried areal plant of HerbaAndrographidis.

·         Synonym: Justiciapaniculata.Justicialatebrosa, .paniculataBurm.

·         Common Name(s): Kalmegh (Hindi), Kalmegha (Snaskrit), Chuanxinlian (Chinese), Kalupnath , Kirayat (Hindi), Mahatita (King of Bitters), Alui , Bhunimba , Bhui-neem , Yavatikta (Sanskrit), Sam biloto (Malay)

·         geographical distribution:Andrographispaniculata is an important medicinal plant and widely used around the world. It belongs to the family Acanthaceae. A.Paniculata is used as a traditional herbal medicine in Bangladesh, China, Hong Kong, India, Pakistan, Philippines, Malaysia, Indonesia, and Thailand  andalso native to Taiwan, Mainland China, and India. It is also commonly found in the tropical and subtropical Asia, Southeast Asia, and some other countries including Cambodia, Caribbean islands, Indonesia, Laos, Malaysia, Myanmar, Sri Lanka, Thailand, and Vietnam . This plant is also found in different phytogeographical and edaphic zones of China, America, West Indies, and Christmas Island.and is ethnobotanically used for the treatment of snake bite, bug bite, diabetes, dysentery, fever, and malaria. In the Unani and Ayurvedic medicine is one of the mostly used medicinal plants . In recent times, commercial preparations of this plant extracts are also used in certain countries. However, the preparations yet need to be standardized for their better efficacy.

plant material of interest:
general appearance:

·         Mixture of broken, crisp, mainly dark green lanceolate leaves and quadrangular stems; capsule fruit and small flowers occasionally found (1, 3). Stem texture fragile, easily broken; leaves simple, petiole short or nearly sessile, lanceolate or ovate-lanceolate, with acuminate apex and cuneate-decurrent base, lamina crumpled and easily broken.

·         Microscopic characteristics:

·         Leaf upper epidermis: stomata absent, glandular trichomes present, unicellular and multicellular trichomes rare, cystoliths fairly large; lithocysts large (27– 30mm thick, 96–210mm long and up to 49mm wide); columnar palisade cells; collenchyma in midrib beneath epidermis; parenchyma cells spongy; vascular bundles of lignified xylem in the upper part and lignified phloem in the lower part; spiral, scalariform and reticulate vessels. Leaf lower epidermis: a layer of wavy-walled cells; stomata diacytic; trichomes up to 36mm in diameter and 180 mm long, and cystoliths present. Stem: epidermis has glandular and non-glandular trichomes. Collenchyma dense at the corners of stems; parenchyma contains chloroplastids. Endodermis composed of a layer of thick-walled cells. Wood with spiral, scalariform and pitted xylem vessels; pith composed of large parenchyma cells. Small acicular crystals of calcium oxalate occur in the pith and cortical cells of stem and leaf (1–3, 8).

·         organoleptic properties:

·         Odour: slight, characteristic; taste: intensely bitter (1–3, 9)

·         Powered plant material Leaf fragments in surface view show upper epidermis with underlying palisade and cystoliths, lower epidermis with underlying palisade cells with stomata, cystoliths and glandular trichomes. Leaf fragments in sectional view show upper epidermis with palisade cells, spongy parenchyma cells, vascular bundles; and lower epidermis with bundles of xylem associated with fibres; fragments of spiral, scalariform, reticulate and pitted vessels; fragments of epidermal cells from midrib; fragments of parenchyma cells in transverse and longitudinal sections. Bundles of fibres. Fragments of epidermal cells from stem with stomata, cystoliths and glandular trichomes. Scattered cystoliths; scattered unicellular and multicellular trichomes, mostly from epidermal cells in fruit walls; scattered glandular trichomes from bundles of fibres in fruit wall; scattered pollen grains (1).

·         General identity tests
Macroscopic and microscopic examinations, chemical tests, and thin-layer chromatography for the presence of diterpene lactones (1–3). HerbaAndrographidis

·         Purity tests

·          Microbiological

·          Tests for specific microorganisms and microbial contamination limits are as described in the WHO guidelines on quality control methods for medicinal plants (12).

 Chemical

·         Not less than 6% of total diterpene lactones, calculated as andrographolide (1, 3).

·         Foreign organic matter

·         Not more than 2% (1, 3).

·         Acid-insoluble ash

·          Not more than 2% (1, 3).

·         Water-soluble extractive

·          Not less than 18% (1, 3).

·         Alcohol-soluble extractive

·          Not less than 13% using 85% ethanol (1, 3).

·         Loss on drying

·         Not more than 10% (1).

·         Pesticide residues

·          The recommended maximum limit of aldrin and dieldrin is not more than 0.05mg/kg (13). For other pesticides, see the European pharmacopoeia (13), and the WHO guidelines on quality control methods for medicinal plants (12) and pesticide residues (14).

·         Heavy metals

·          For maximum limits and analysis of heavy metals, consult the WHO guidelines on quality control methods for medicinal plants (12).

·         Radioactive residues

·          Where applicable, consult the WHO guidelines on quality control methods for medicinal plants (12) for the analysis of radioactive isotopes.

·         Other purity tests

·         Total ash test to be established in accordance with national requirements. WHO monographs on selected medicinal plants 14

·         Chemical assays

·          Chemical and thin-layer chromatography methods are used for qualitative analysis of andrographolidediterpene lactones (1, 2). Titrimetric (1) and high-performance liquid chromatography (15) methods are available for quantitative analysis of total diterpene lactones.

·         Major chemical constituents

·          The major constituents are diterpene lactones (free and in glycosidic forms) including andrographolide, deoxyandrographolide, 11,12-didehydro-14-deoxyandrographolide, neoandrographolide, andrographiside, deoxyandrographiside and andropanoside (1, 3, 6, 7, 9, 16). The structures of andrographolide and related diterpene lactones are presented below.

·          Medicinal uses

·         Uses supported by clinical data

·          Prophylaxis and symptomatic treatment of upper respiratory infections, such as the common cold and uncomplicated sinusitis (17–19), bronchitis (6, 9) and pharyngotonsillitis (20), lower urinary tract infections (21) and acute diarrhoea (22, 23).

·         Uses described in pharmacopoeias and in traditional systems of medicine

·         Treatment of bacillary dysentery, bronchitis, carbuncles, colitis, coughs, dyspepsia, fevers, hepatitis, malaria, mouth ulcers, sores, tuberculosis and venomous snake bites (1, 2, 6, 7, 10, 16, 24–27).

·         Uses described in folk medicinenot supported by experimental or clinical data

·         Treatment of colic, otitis media, vaginitis, pelvic inflammatory disease, chickenpox, eczema and burns (6, 7).

·         Pharmacology

·          Experimental pharmacology

·         Antibacterial activity

·         An ethanol extract of the leaves inhibited the growth in vitro of Escherichia coli and Staphylococcus aureus (28). A 50% methanol extract of the leaves inhibited growth in vitro of Proteus vulgaris (29). However, no in vitro antibacterial activity was observed when dried powder from the aerial parts was tested against E. coli, Staphylococcus aureus, Salmonella typhi or Shigella species (30).

·         Anti-human immunodeficiency virus (HIV) activity

·          Aqueous extracts of the leaves inhibited HIV-1 infection and replication in the lymphoid cell line MOLT-4 (31). A hot aqueous extract of the aerial parts reduced the percentage of HIV antigen-positive H9 cells (32). Dehydroandrographolide inhibited HIV-1 and HIV-1 (UCD123) infection of H9 cells at 1.6mg/ml and 50mg/ml, respectively, and also inhibited HIV-1 infection of human lymphocytes at 50mg/ml (33). A methanol extract of the leaves suppressed syncytia formation in co-cultures of uninfected and HIV-1-infected MOLT cells (median effective dose [ED50] 70mg/ml) (34).

·         Immunostimulatory activity

·         Intragastric administration of an ethanol extract of the aerial parts (25mg/kg body weight) or purified andrographolides (1mg/kg body weight) to mice stimulated antibody production and the delayed-type hypersensitivity response to sheep red blood cells (35). The extract also stimulated a non-specific immune response in mice, measured by macrophage migration index, phagocytosis of [ 14C]leucine-labelled E. coli, and proliferation of splenic lymphocytes (35). The extract was more effective than either andrographolide or neoandrographolide alone, suggesting that other constituents may be involved in the immunostimulant response (35).

·         Antipyretic activity

·         Intragastric administration of an ethanol extract of the aerial parts (500mg/kg body weight) to rats decreased yeast-induced pyrexia (36). The extract was reported to be as effective as 200mg/kg body weight of aspirin, and no toxicity was observed at doses up to 600mg/kg body weight (36). Intragastric administration of andrographolide (100mg/kg body weight) to mice decreased brewer’s yeast-induced pyrexia (37). Intragastric administration of deoxyandrographolide, andrographolide, neoandrographolide or 11,12-didehydro- 14-deoxyandrographolide (100mg/kg body weight) to mice, rats or rabbits reduced pyrexia induced by 2,4-dinitrophenol or endotoxins (6, 38).

·         Antidiarrhoeal activity

·         HerbaAndrographidis has antidiarrhoeal activity in situ (39, 40). An ethanol, chloroform or 1-butanol extract of the aerial parts (300mg/ml) inhibited the WHO monographs on selected medicinal plants 16E. coli enterotoxin-induced secretory response—which causes a diarrhoeal syndrome—in the rabbit and guinea-pig ileal loop assay (39, 40). However, an aqueous extract of the aerial parts was not active (40). The constituent diterpene lactones, andrographolide and neoandrographolide, exhibited potent antisecretory activity in vivo against E. coli enterotoxin-induced diarrhoea (40). Andrographolide (1mg per loop) was as active as loperamide when tested against heat-labile E. coli enterotoxin-induced diarrhoea and more effective than loperamide when tested against heat-stable E. coli enterotoxin-induced diarrhoea (40). Neoandrographolide (1mg per loop) was as effective as loperamide when tested against heat-labile E. coli enterotoxin-induced diarrhoea and slightly less active than loperamide when tested against heat-stable E. coli enterotoxin-induced diarrhoea (40). The mechanism of action involves inhibition of the intestinal secretory response induced by heat-labile E. coli enterotoxins, which are known to act through the stimulation of adenylatecyclase, and by inhibition of the secretion induced by heat-stable E. coli enterotoxins, which act through the activation of guanylatecyclase (39). Incubation of murine macrophages with andrographolide (1–50mmol/l) inhibited bacterial endotoxin-induced nitrite accumulation in a concentration- and timedependent manner. Western blot analysis demonstrated that andrographolide inhibited the expression of an inducible isoform of nitric oxide synthase linked to endotoxin-induced circulatory shock (41).

Anti-inflammatory activity:

Intragastric administration of deoxyandrographolide, andrographolide, neoandrographolide or 11,12-didehydrodeoxyandrographolide to mice inhibited the increase in cutaneous or peritoneal capillary permeability induced by xylene or acetic acid, and reduced acute exudation in Selyegranulocysts treated with croton oil. 11,12-Didehydrodeoxyandrographolide had the most potent antiinflammatory activity in vivo (6).

Antimalarial activity:

 A 50% ethanol extract of the aerial parts inhibited the growth of Plasmodium berghei both in vitro (100mg/ml) and in mice after intragastric administration (1g/kg body weight) (42). Intragastric administration of a 1-butanol, chloroform or ethanol–water extract of the aerial parts to Mastomysnatalensis inhibited the growth of P. berghei at doses of 1–2g/kg body weight (43). Andrographolide (5mg/kg body weight) and neoandrographolide (2.5mg/kg body weight) were also effective when administered by gastric lavage (43).

Antivenom activity

Intraperitoneal injection of an ethanol extract of the aerial parts (25g/kg body weight) to mice poisoned with cobra venom markedly delayed the occurrence of respiratory failure and death (6, 44). The same extract induced contractions in guinea-pig ileum at concentrations of 2mg/ml. The contractions were HerbaAndrographidis 17enhanced by physostigmine and blocked by atropine, but were unchanged by antihistamines (44). These data suggest that extracts of the aerial parts do not modify the activity of the nicotinic receptors but produce significant muscarinic activity, which accounts for its antivenom effects (6, 44).

Antihepatotoxicactivity :

The aerial parts and their constituent andrographolides have antihepatotoxic activity in vitro and in vivo (45–54). Intraperitoneal administration of a methanol extract of the aerial parts (861.3mg/kg body weight) to mice reduced hepatotoxicity induced by carbon tetrachloride (CCl4), and reversed CCl4-induced histopathological changes in the liver (52). Intraperitoneal administration of andrographolide (100mg/kg body weight) to mice inhibited the CCl4-induced increase in the activity of serum glutamate oxaloacetate transaminase, serum glutamate pyruvate transaminase, alkaline phosphatase, bilirubin and hepatic triglycerides (52). Intraperitoneal administration of a methanol extract of the aerial parts (500mg/kg body weight) to rats also suppressed the CCl4-induced increase in the activity of serum glutamate oxaloacetate transaminase, serum glutamate pyruvate transaminase, alkaline phosphatase and bilirubin (51). Intragastric administration of an aqueous extract of the aerial parts (500mg/kg body weight) to ethanol-treated rats decreased the activity of serum transaminases and suppressed histopathological changes in the liver (49). Andrographolide, the major antihepatotoxic component of the plant, exerted a pronounced protective effect in rats against hepatotoxicity induced by CCl4 (47), Dgalactosamine (54), paracetamol (48) and ethanol (49). Andrographolide was more effective than silymarin, the standard hepatoprotective agent (47, 48).

Clinical pharmacology

The common cold :

HerbaAndrographidis has been used clinically for symptomatic treatment of the common cold and uncomplicated sinusitis, pharyngotonsillitis, pneumonia and bronchitis (6, 17, 18, 20). A placebo-controlled, double-blind clinical trial assessed the efficacy of a standardized extract of the aerial parts (containing 4% andrographolides) for treatment of the common cold in 61 adult patients. A significant reduction (P < 0.0001) in clinical symptoms such as sore throat, tiredness, muscular ache and malaise was observed on day 4 in the group receiving 1200mg extract daily, as compared with the placebo group. No adverse reactions were reported in either group (17). A randomized, placebo-controlled, double-blind pilot trial was conducted to evaluate the efficacy of a standardized extract of the aerial parts (containing 4% andrographolides) on the initial symptoms of the common cold and uncomplicated sinusitis. Fifty adult patients received either 1020mg extract or a placebo daily for 5 days. The results demonstrated that patients in the treated group took less sick leave

than those in the placebo group (0.21 day compared to 0.96 day). Furthermore, 68% of treated patients felt totally recovered, as WHO monographs on selected medicinal plants 18compared with 36% of the placebo group. Also 55% of the treated patients thought that the course of illness was much easier than normal, as compared with 19% of the placebo group (18). A randomized, placebo-controlled, double-blind study evaluated a standardized extract of the aerial parts (containing 4% andrographolides) in the prophylaxis of the common cold in 107 schoolchildren during the winter season. The children received either 200mg extract or a placebo daily for 3 months and were evaluated weekly by a physician. There was no difference in the occurrence of colds between the two groups during the first 2 months of treatment. However, after the third month of treatment, there was a significant difference (P < 0.05) in the occurrence of the common cold in the treated group (30%) as compared with the placebo group (62%) (19). A randomized, double-blind comparison study of 152 adult patients with pharyngotonsillitis evaluated the efficacy of powdered aerial parts (6g daily) and paracetamol (1 capsule of 325mg as needed) for improving symptomatology. Baseline evaluation showed no significant difference between the two groups. The crude drug was as effective as paracetamol in reducing the incidence of sore throat and fever after 3 days of treatment (20). In a study without controls, treatment of patients with a standardized extract of A. paniculata (containing 4% andrographolides) reduced the incidence of fever associated with the common cold. The body temperature of patients treated with the extract was lowered in less than 48 hours after treatment (55). This finding was con- firmed in a later study (17).

Urinary infections

A clinical trial compared the efficacy of HerbaAndrographidis, co-trimoxazole (sulfamethoxazole + trimethoprim) and norfloxacin in the prevention of urinary tract infections after extracorporeal shock wave lithotripsy. Patients received a 5-day course of either HerbaAndrographidis (4 tablets of 250mg, three times daily) or co-trimoxazole (2 tablets of 25mg, twice daily) or norfloxacin (1 tablet of 200mg, twice daily). After 1 month of treatment, urinalysis results of 100 patients demonstrated that pyuria, haematuria and proteinuria were reduced in all treatment groups, and there was no significant difference between the three treatments (21).

Dysentery :

The aerial parts have been used for the treatment of acute bacillary dysentery and enteritis (2, 6, 22, 23). In clinical studies, the combination of andrographolide and neoandrographolide was reported to be more effective than either furazolidine or chloramphenicol in the treatment of bacillary dysentery (6). A randomized, double-blind clinical study of 200 patients compared the efficacy of the powdered aerial parts with tetracycline in the treatment of acute diarrhoea and bacillary dysentery (22, 23). Patients received capsules of either the aerial parts or tetracycline (both 500mg, four times daily) for 3 days. Compared with tetracycline, the aerial parts decreased the diarrhoea (both the freHerbaAndrographidis 19quency and amount of discharge) (22). Furthermore, the aerial parts were more effective in treating diarrhoea resulting from shigellosis than from cholera (22).

Infectious hepatitis:

 Administration of a decoction of the aerial parts to patients with infectious hepatitis was reported to provide symptomatic relief (24).

Contraindications:

HerbaAndrographidis should not be used during pregnancy or lactation. HerbaAndrographidis is contraindicated in cases of known allergy to plants of the Acanthaceae family.

Warnings

 Due to potential anaphylactic reactions, crude extracts of HerbaAndrographidis should not be injected (6, 56).

Precautions :

Drug interactions:

Extracts of HerbaAndrographidis may have a synergistic effect with isoniazid (6).

Carcinogenesis, mutagenesis, impairment of fertility :

HerbaAndrographidis extracts are not mutagenic in vitro (57) and have antimutagenic activity (58). A standardized extract of A. paniculata did not produce reproductive toxicity in male rats after 60 days of intragastric administration of 20–1000mg/kg body weight daily (59). Pregnancy: teratogenic effects See Contraindications.

Pregnancy: non-teratogenic effects:

 In vivo studies in mice and rabbits suggest that HerbaAndrographidis may have abortifacient activity (6, 60). Conversely, no interruption of pregnancy, fetal resorption or decrease in the number of live offspring was observed in pregnant rats after intragastric administration of an extract of the aerial parts at 2g/kg body weight during the first 9 days of gestation (61). Since potential antagonism exists between HerbaAndrographidis and endogenous progesterone, HerbaAndrographidis should not be used during pregnancy (2, 61).
Other precautions :

No information available on general precautions or precautions concerning drug and laboratory test interactions; or paediatric use. Therefore, HerbaAndrographidis should not be administered to children without medical supervision.

Adverse reactions :

Large oral doses of HerbaAndrographidis may cause gastric discomfort, vomiting and loss of appetite (6). These side-effects appear to be due to the bitter taste of andrographolide (6). Anaphylactic reactions may occur if the crude drug extract is injected (6, 56). Two cases of urticaria have been reported (18).

 Dosage forms:

 Crude drug, capsules, tablets and pills (1, 2, 6). Store in a well-closed container, protected from light and moisture.

Posology:

 (Unless otherwise indicated) For pyrexia: a decoction from 3g crude drug, twice daily (1, 5). For the common cold: 1.5–3.0g powdered crude drug three times daily, after meals and at bedtime (1). For diarrhoea: a decoction from 3–9g crude drug as a single dose as needed (1, 5), or two tablets of 500mg four times daily, after meals and at bedtime (5).
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