Phytotheraphy-safety aspects


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Phytotheraphy-safety aspects

  1. 1. Natural Product Radiance, Vol. 8(1), 2009, pp.55-63 General Article Phytotherapy–Safety aspects Annie Shirwaikar1*, Renu Verma1, Richard Lobo1 and Arun Shirwaikar2 1 Department of Pharmacognosy, Manipal College of Pharmaceutical Sciences Manipal University, Manipal-576 104, Karnataka, India 2 Department of Pharmaceutics, Manipal College of Pharmaceutical Sciences Manipal University, Manipal *Correspondent author, E-mail: Received 14 January 2008; Accepted 30 July 2008 Abstract prohibited in unlicensed medicinal Plants have been used since ancient times as medicines for the treatment of a range of products. Other concerns, particularly diseases. In spite of the great advances observed in modern medicine in recent decades, plants still interactions with conventional medicines, make an important contribution to health care. According to the World Health Organization are the consequence of using conventional (WHO), because of poverty and lack of access to modern medicine, about 65-80% of the world’s medicines and herbal products population that are living in developing countries depend essentially on plants for primary health simultaneously and are of no surprise care. Phytotherapeutic agents are herbal preparations consisting of complex mixtures of one or more plants which contain active ingredients, plant parts or plant material in the crude or processed from a scientific viewpoint. Interactions, state. The data existing for most plants to guarantee their quality, efficacy and safety is insufficient. particularly those with medicines, can and The concept that herbal drugs are safe and free from side effects is not always. Plants contain do give rise to serious public health hundreds of constituents, some of which are very toxic namely the most cytotoxic anti-cancer concerns. The potential for herb-drug plant-derived drugs is pyrrolizidine alkaloids, etc. However, the adverse effects of phytotherapeutic interactions has been highlighted by the agents are less as compared with synthetic drugs. Several regulatory models for herbal medicines are currently available including prescription drugs, over-the-counter substances, traditional recognition that the widely used herbal medicines and dietary supplements. Harmonization and improvement in the processes of regulation remedy, St John’s Wort (Hypericum is needed for safety aspects related to phytotherapy. perforatum Linn.), may interact with Keywords: Herbs, Phytotherapy, Herbal safety, Toxic constituents. certain important medicines. These IPC code; Int. cl.8— A61K 36/00 include for example HIV protease inhibitors, oral contraceptives, Introduction medicinal products reflect a growing cyclosporin and warfarin, leading to a loss market, largely unregulated, where many or reduction in the therapeutic effect of Phytotherapeutic agents are of the safety concerns arise due to lack of these prescribed medicines4,5. normally marketed as standardized effective quality controls. Other serious Compared with well-defined preparations in the form of liquid, solid, quality related safety problems include the synthetic drugs, herbal medicines exhibit or viscous preparations and extracts. They deliberate addition of prescription some marked differences: The active are prepared by maceration, percolation medicines and toxic heavy metals to herbal principles of herbal drugs are frequently or distillation (volatile oils). Solid or products1-3. unknown so that standardization, stability extracts are prepared by evaporation of Increased usage and awareness of and quality control, though feasible, may the solvents used in the process of potential safety concerns have identified not be easy. Also the availability and quality extraction of the raw material. hitherto unknown safety problems of raw materials are frequently Phytotherapeutic agents are often associated with some traditional herbal problematic and well-controlled double- administered in a highly concentrated products. Serious liver toxicity associated blind clinical and toxicological studies to form so as to improve their therapeutic with the use of Kava-kava (Piper prove their efficacy and safety are rare. efficacy. However, some secondary methysticum G. Forst.) has been Though the occurrence of undesirable side metabolites present in the plants may reported recently and it has been advised effects seems to be less frequent with produce undesirable side effects. The that the use of Kava-kava should be herbal medicines, well-controlled safety problems emerging with herbal Vol 8(1) January-February 2009 55
  2. 2. General Article randomized clinical trials have revealed hepatotoxicity, may well have been 2. Intrinsically toxic that they may exist 6-8. overlooked by previous generations and phytoconstituents Therefore, there is an urgent it is these types of toxicity that are of most In many cases, the patient may need for the public to have an concern when assessing the safety of be exposed to herbal ingredients which understanding of the risks posed by herbal remedies11,12. are potentially toxic and possess phytotherapy and to ensure that such constituents that may cause adverse drug products are used judiciously. This paper Excessive ingestion: Excessive doses of reactions. Very often the constituents attempts to highlight the safety aspects that Ginseng have been reported to cause responsible for toxicity are unknown should be taken into consideration in agitation, insomnia and raised blood (Table 1). Given below are some phytotherapy. The safety concerns mainly pressure and these have been referred to identified common examples of fall into following five main categories: as abuse of the remedy. Side effects intrinsically toxic phytoconstituents. including mastalgia and vaginal bleeding 1. Self-administration/ have been reported for ginseng following Apiole: The irritant principle present in medication the ingestion of recommended doses. the volatile oil of parsley (Petroselinum Self-administration of any Similarly excessive ingestion of Liquorice crispum) is found responsible for its therapy in preference to conventional has resulted in typical corticosteroid-type abortifacient action. Apiole is also 13,14 treatment may delay a patient seeking side effects of oedema and hypertension . hepatotoxic and liver damage has been qualified advice, or cause a patient to documented as a result of excessive abandon conventional treatment without Hypersensitivity reactions: ingestion of parsley, far exceeding normal first seeking appropriate advice. Toxicity Sesquiterpene lactones are known to dietary consumption over a prolonged due to herbal drugs can also be due to possess allergenic properties. They occur period16. insufficient knowledge about the predominantly in herbs of the Asteraceae H C O 3 CH constituents and the dose of the drug. The family and hypersensitivity reactions have 3 safety of herbal medicinal products is of been reported for Chamomile and other NH 2 particular importance as most of these plants of this family. Cross-sensitivity to O O CH products are self-prescribed and are used other members of this family is well 3 O to treat minor and often chronic recognized. The sesquiterpene lactones conditions. Recent research highlights the present in Feverfew are considered to be Apiole fact that patients are reluctant to tell their the active principles in the herb. It is β -Asarone: Calamus rhizome oil doctors that they are taking herbal unknown whether documented side contains β-asarone as the major products and thus it is probable that effects for Feverfew, such as mouth ulcers component, which has been shown to be adverse reactions to herbal products are and swollen tongue, are also attributable carcinogenic in animal studies. Many under-reported9,10. to this constituents15. other culinary herbs contain low levels of The extensive traditional use of β-asarone in their volatile oils and plants as medicines has enabled those Phototoxic reactions: Furanocoumarins, therefore, the level of β-asarone permitted medicines with acute and obvious signs compounds known to cause phototoxic in foods as flavouring is restricted16. of toxicity to be well recognized and their reactions, are constituents of Parsley OCH 3 use avoided. However, the promise that [Petroselinum crispum (Mill.) Airy- H CO traditional use of a plant for perhaps many Shaw]. Excessive ingestion of Parsley has 3 CH 3 hundreds of years establishes its safety does been associated with the development of not necessarily hold true. The more subtle photosensitive rash, which resolved once 16 and chronic forms of toxicity, such as Parsley consumption ceased . OCH 3 carcinogenicity, mutagenicity and β-Asarone 56 Natural Product Radiance
  3. 3. General Article COOH Estragole: Estragole is a constituent of O use and is permitted only as an ingredient many culinary herbs but is a major of products intended for external use on component of the oils of Fennel and Sweet unbroken skin. NO2 basil (Ocimum basilicum Linn.). O Lectins: Lectins are plant proteins which Estragole has been reported to be possess haemagglutinating and potent carcinogenic in animals and the level of mitogenic properties. Both mistletoe estragole permitted in food products as (Viscum album Linn.) and Pokeroot flavouring is restricted16. (Phytolacca americana Linn.) H 2C contain lectins. Systemic exposure to CH 3 O CH 3 Pokeroot has resulted in haematological O Aristolochic acid aberrations. Mistletoe lectins may also inhibit protein synthesis20. Estragole CH2OCOR Viscotoxins: Viscotoxins are low Safrole: Animal studies involving Safrole, molecular weight constituents of the major component of Chinese sassafras mistletoe (V. album), which possess oil [Cinnamomum camphora cytotoxic and cardiotoxic properties. For (Linn.) Nees & Eberm.] have shown it N many years, mistletoe preparations have to be hepatotoxic and carcinogenic. The Basic nucleus of pyrrolizidine alkaloids been used in Europe for cancer permitted level of Safrole as a flavouring treatment20. Clinical trials carried out with in foods is 0.1mg/kg16. known to injure the liver in humans giving Iscador, a product obtained from the rise to serious liver damage (hepatic veno- naturally fermented plant juice of O occlusive disease). This hepatotoxicity Mistletoe, have concluded that Iscador associated with their consumption is well may exhibit some weak antitumour effects O documented and has been attributed to but should only be used alongside CH 2 the pyrrolizidine alkaloid constituents18, 19. conventional therapy in the long term Safrole Pyrrolizidine alkaloids can be divided into treatment of cancer. Aristolochic acids: These are reported two categories based on their structure, Lignans: The hepatotoxic reactions to occur only in the Aristolochiaceae namely those with an unsaturated nucleus reported for Chaparral (Larrea family. They have been reported in (toxic) and those with a saturated nucleus tridentata J. M. Coult.) have Aristolochia species and appear to (considered non-toxic). A number of been associated with its lignan occur throughout the plant in the roots, herbs currently used in herbal remedies constituents20. stem, herb and fruit. The Aristolochic contain pyrrolizidines; they include Life acids are a series of substituted root (Senecio aureus Linn.), borage nitrophenanthrene carboxylic acids. (Borago officinalis Linn.) and Aristolochic acids have been shown to be Comfrey (Symphytum officinale nephrotoxic, carcinogenic and Linn.). In addition to various animal CH 3 mutagenic17. studies, two cases of human hepatotoxicity associated with the ingestion of comfrey Pyrrolizidine alkaloids: These are have been documented. Following advice present in a number of plant species, of the Committee on Review of Medicines notably Crotalaria Linn. and (CRM), comfrey has been removed from CH 3 Heliotropium Linn. These alkaloids are all licensed products intended for internal Basic lignan nucleus Vol 8(1) January-February 2009 57
  4. 4. General Article Saponins: Pokeroot (P. americana) extremely irritant to all mucosal surfaces. the patients had consumed Apricot kernels also contains irritant saponins which have Cyanogenic glycosides: These are as an Alternative source of amygdalin23. produced severe gastrointestinal irritation present in the kernels of a number of involving intense abdominal cramping fruits including Apricot, Bitter almond, Furanocoumarins: These are found and haematemesis. Systemic exposure to Cherry, Pear and Plum seeds. Gastric predominantly in the family — Apiaceae these saponins has resulted in hypotension hydrolysis of these compounds following (Parsley, Celery), Rutaceae (eg. Bergamot, and tachycardia. In May 1979, the US Herb oral ingestion results in the release of Citrus species), Moraceae and Fabaceae. Trade Association requested that all its hydrogen cyanide (HCN), which is rapidly The furanocoumarins occur as linear and members should stop selling Pokeroot as absorbed from the upper gastrointestinal branched forms. The most commonly a herbal beverage or food because of its tract and lead to respiratory failure. It has reported linear furanocoumarins are toxicity. The saponins found in Pokeroot been estimated that oral doses of 50mg 8-methoxypsoralen, 5-methoxypsoralen include phytolaccagenin and oleanolic of HCN can be fatal, equivalent to about and psoralen itself. The furanocoumarins acid21. 50-60 Apricot kernels 22. However, are phototoxic. Severe phototoxic variation in cyanogenic glycoside content reactions have been reported in humans H 3C COOCH3 of the kernels could reduce or increase following the use of Bergamot oil in the number required for a fatal reaction. topical preparations. H In the early 1980s a substance called In UK a patient developed severe amygdalin, a cyanogenic glycoside, was phototoxicity during oral photo- COOH promoted as a natural non-toxic cure for chemotherapy with psoralen and ultraviolet CH 3 H3C HO cancer. Two near-fatal episodes of HCN A (PUVA) therapy after eating a large quantity CH 3 poisoning have been recorded in which of soup made from Celery and Parsley24-26. H 3C HO CH2OH Phytolaccagenin Prunase Benzaldehyde Amygdalase CH ORR′ CH OR + H2O H2O HCN + CH 3 CN CN Glucose H3C Amygdalin Prunasin H (Where ORR′-genitiobiose) (Where OR’-glucose) COOH CH 3 H3C CH 3 HO H3C CH 3 O CH3 Oleanolic acid Diterpenes: The irritant properties of O O O many diterpenes are well documented. O O O O Queen’s delight (Stillingia sylvatica CH 3 Linn.) contains diterpene esters which are 5-Methoxypsoralen 8-Methoxypsoralen 58 Natural Product Radiance
  5. 5. General Article Table 1 : Some potential toxic constituents of herbal medicines decrease the pharmacological or toxicological effects of either component. Herbal drug Adverse effect/toxicity Toxic constituent Synergistic therapeutic effects may complicate the dosing of long-term Aloe Allergic reactions, headache, increase in menstrual flow Anthraquinones medications28, 29. Arnica Gastroenteritis, dermatitis Anethole Herbal medicines are ubiquitous; Artichoke Allergic contact dermatitis Sesquiterpene the dearth of reports of adverse events and lactones interactions probably reflects a Buchu Gastrointestinal and renal irritation Pulegone combination of under-reporting and the Capsicum Allergic alveolitis Capsaicinoids benign nature of most herbs used. Dandelion Contact allergic reactions Quinones Experimental data in the field of herb-drug interactions are limited, case Elder Nausea, vomiting, diarrhoea Cyanogenic glycosides reports scarce and case series are also rare. This lack of data is also true of drug-drug Garlic Nausea, vomiting, diarrhoea, contact dermatitis Sulphur containing compound interactions; published clinical studies are mainly case reports. Polypharmacy is Ginkgo Gastrointestinal upset, headache Unknown common and to the mixture physicians Ginseng Hypertension, diarrhoea, insomnia, vaginal bleeding, do- prescribe, patients add various over-the- skin eruption, nervousness counter medications, vitamins, herbs and Isapghula Flatulence, abdominal distention, intestinal obstruction do- foods. All ingested substances have the Liquorice Hypertension, hypokelemia, weight gain Glycyrrhizin potential to interact29. Lobelia Nausea, vomiting diarrhoea Lobeline Pharmacodynamic types of Rhubarb Abdominal discomfort, loss of electrolytes, Anthraquinones herb-to-drug interactions are best urine coloured red identified by analyzing the therapeutic Senna Abdominal discomfort, loss of electrolytes, Anthraquinones effect of the herbs and drugs (Table 2). urine coloured red Concurrent use of herbs and drugs with St. John’s wort Allergic reactions Unknown similar therapeutic actions will undoubtedly pose potential risk of herb- to-drug interactions. The increase in 3. Herb interactions vitamins. The interaction may increase or treatment effect interferes with optimal Herbal medicinal products may decrease the effectiveness and/or the side treatment outcome; the desired effect in some cases compromise the efficacy of effects of the drugs. It may also result in a becomes more unpredictable and harder conventional medicines, for example new side effect, that is, a side effect not to obtain with precision. The highest risk through herb-drug interactions, herb-herb seen with the use of any one drug alone27. of clinically-significant interactions occur interactions and herb-food interactions. The possibility of occurrence of between herbs and drugs that have A drug interaction is an interaction a drug interaction increases with the sympathomimetic effects, cardiovascular between a drug and another substance that number of drugs being taken by a patient. effects, diuretic effects, anti-coagulant prevents the drug from performing as Therefore, individuals who take several effects and anti-diabetic effects. Herbs expected. This definition applies to medications are at the great risk for with sympathomimetic effects may interactions of drugs with other drugs interactions. Many medicinal herbs and interfere with anti-hypertensive and (drug-drug interactions), drugs with food pharmaceutical drugs are therapeutic at anti-seizure drugs. The classic example of (drug-food interactions) as well as drugs one dose and toxic at another. Interactions an herb with sympathomimetic effects is with other substances like herbs or between herbs and drugs may increase or Ephedra, which contains ephedrine, Vol 8(1) January-February 2009 59
  6. 6. General Article Table 2 : Herb-drug interactions32 Herb Common uses Interactions with Problems which may occur Ephedra For asthma, cough and to Cardiac glycosides, general anesthesia, Seizures, adverse cardiovascular events, induce weight loss MAO inhibitors, decongestants, stimulants hypertension Garlic To decrease cholesterol and Anticoagulants, Acetaminophen Enhances bleeding, increase sulfation blood clot formation Ginger Nausea Anticoagulants, barbiturates, antihypertensives, Enhances bleeding, CNS depression, cardiac drugs, hypoglycemic drugs hypotension, cardiac arrhythmia, hypoglycemia Ginseng To increase energy and Anticoagulants, stimulants, antihypertensives, Enhances bleeding, tachycardia and reduce stress antidepressants/phenelzine, digoxin, potentiates hypertension, mania, serotonin syndrome the effects of corticosteroids and estrogens Liquorice Peptic ulcers and as Antihypertensives, potentiates the effects of Hypertension, hypokalemia, edema expectorant corticosteroids St. John’s Wort Mild depression, anxiety, Anticoagulants, antidepressants, decreases Enhances bleeding, hastens metabolic seasonal affective disorder the effectiveness of cyclosporine, antiviral drugs, breakdown of drugs, contra-indicated for digoxin, dextrometorphan, prolongs the effects of organ transplant recipients, nausea, vomiting, general anesthetics, MAO inhibitors, Nefazodone headache pseudoephedrine, norephedrine and other anti-coagulant drugs, such as warfarin, to stimulation32 and consumption of St John’s ephedrine alkaloids. Ephedra may interact prolong the bleeding time. Herbs that Wort and aged cheese causes fatal rise in with many other drugs and disease interfere with warfarin include Salviae blood pressure. Cuzzolin et al33 have conditions and should always be used with miltiorrhizae (Danshen) and reported some serious reactions leading caution in patients with hypertension, Angelica sinensis (Oliv.) Diels. The to hospitalization due to drug interaction seizures, diabetes, thyroid conditions, etc. synergistic interaction between herbs and (Table 3) Concomitant use of diuretic herbs and warfarin may be advantageous for the diuretic drugs may have additive or patient as the dosage of both the herbs 4. Quality related safety synergistic effects; hypertension may be and drugs can be reduced without issues/Contaminants more difficult to control and/or compromising clinical effectiveness. The The patient may be at risk of hypotensive episodes may result. The reduction in dosage will also decrease the toxicity as a result of exposure to dosage of herbs and/or drugs must be frequency and severity of side effects of contaminants present in the herbal adjusted to achieve optimal treatment the drugs. Optimal treatment, however, product (Table 4). outcome. Commonly used diuretic herbs is directly dependent on careful titration include Poria cocos, Polypori of the herb and drug, co-operation from Substitution and adulteration: Herbal umbellata Zhu ling and Alismatis the patient and communication between medicines adulterated with other plant orientalis (Sam.) Juzep30- 32. the physicians who prescribe the herbs and materials and even with conventional Herbs with anti-coagulant effects drugs30, 31. medicines cause serious toxicity, e.g. encompass herbs that have blood- Herb-food interaction and their Aristolochia was the most significant activating and blood-stasis-removing risks have also been reported eg. Ginseng+ cause of plant toxicity in the last decade; functions. Such herbs may interfere with tea and coffee caused GIT upset and over inadvertent exposure to Aristolochia 60 Natural Product Radiance
  7. 7. General Article Table 3 : Serious adverse drug reaction leading to hospitalization due to drug interaction as reported by Cuzzolin et al 33 Herbal product Concomitant drug Adverse drug reaction Possible mechanism Green tea Contraceptives Ischemia Cardiovascular effects due to caffeine + increase in caffeine half life by hormones Liquorice - Hypertensive crisis Suppression of rennin-angiotensin-aldosterone axis by glycyrrhetinic acid Liquorice Contraceptives Hypertensive crisis Suppression of rennin-angiotensin-aldosterone axis by glycyrrhetinic acid+ increase in sensitivity to glycyrrhetinic acid by oestrogens Passion flower Benzodiazepines Anaphylactic shock Hypertensive reactions to the herb Propolis - Systemic allergy Hypertensive reactions to Propolis Table 4 : Some adulterants and contaminants ingredients to have aerobic bacteria present at 102-108 colony forming units Type of adulterant and contaminants Examples per gram. Pathogenic organisms including Botanicals (as adulterants) Ailanthus and Phytolacca leaves substituted for Enterobacter, Enterococcus, Belladonna Clostridium, Pseudomonas, Shigella Xanthium leaves for Stramonium and Dandelion for and Streptococcus have been shown to Henbane contaminate herbal ingredients. The Microorganisms (as contaminant) Staphylococcus aureus, Escherichia coli, European Pharmacopoeia gives guidance Salmonella, Shiegella on acceptable microbial limits34. Microbial toxins (as contaminant) Aflatoxin, bacterial endotoxin Fumigation agents (as contaminant) Ethylene oxide, Methyl bromide, Phosphine Pesticides: Herbal ingredients, Toxic metals (as contaminant) Lead, cadmium, mercury, arsenic particularly those grown as cultivated Pesticides (as contaminant) DDT, chlorinated hydrocarbons, organophosphates, crops, may be contaminated by DDT or carbamates, polychlorinated biphenyls other chlorinated hydrocarbons (Aldrin, Chlordane, Endrin, Benzene hexachloride, species in unlicensed herbal medicines has (seventeen cases with twelve fatalities) and Heptachlor, etc.), organophosphates resulted in cases of nephrotoxicity and Japan (ten cases of renal failure). Recently, (Malathion, Parathion, Demeton, carcinogenicity in Europe, China, Japan the FDA has reported two cases of serious Ethion, etc.), carbamates (Zineb, Ziram, and USA. Concerns were first raised about renal disease due to Aristolochia being Thiram etc.) or polychlorinated biphenyls the effects of products containing substituted for Clematis species in a (2, 4-D, 2, 4, 5-T, etc.). Limit tests are aristolochic acids in Belgium where since dietary supplement. necessary for acceptable levels of pesticide 1993 over 100 cases of irreversible contamination of herbal ingredients34. nephropathy have been reported in young Microbial contamination: Aerobic women attending a slimming clinic. The bacteria and fungi are normally present Fumigants: Ethylene oxide, methyl nephrotoxicity was traced to the in plant material and their number may bromide and phosphine have been used inadvertent use of the toxic Aristolochia increase due to faulty growth, harvesting, to control pests, which contaminate fangchi Wu ex Chow & Hwang root storage or processing. Herbal ingredients, herbal ingredients. The use of ethylene in the formulations as a substitute for particularly those with high starch content, oxide as a fumigant with herbal drugs is Stephania tetrandra Moore. Other may be prone to increased microbial no longer permitted in Europe due to cases have been reported in China growth. It is not uncommon for herbal concerns about carcinogenic residues. Vol 8(1) January-February 2009 61
  8. 8. General Article Toxic metals: Lead, cadmium, mercury, uterine contractions. Herbs that contain potential drug-herb interactions and thallium and arsenic have been shown to irritant volatile oils include ground ivy, possible side effects37-39. be contaminants of some herbal juniper, parsley, pennyroyal, sage, pansy ingredients. Limit tests for such toxic and yarrow. Some of these oils contain Conclusion metals may be needed for certain herbal the terpenoid constituent, thujone, which With the global increase in the ingredients. is known to be abortifacient. Pennyroyal use of traditional/complementary and oil also contains the hepatotoxic terpenoidalternative medicines in many parts of Other contaminants: Tests to limit other constituent, pulegone. A case of liver world, policy-makers, health professionals contaminants such as endotoxins, failure in a woman who ingested and the public are wrestling with questions mycotoxins and radionuclides may need pennyroyal oil as an abortifacient has beenabout the safety, quality, availability, to be considered to ensure suitable quality documented. A stimulant or spasmolytic preservation and further development of for medicinal purposes34. action on uterine muscle has been this type of healthcare. Although herbs documented for some herbal ingredients have promising potential and are being 5. Specific patient groups including Blue cohosh, Jamaica increasingly used, many of them are motherwort, Nettle and Raspberry. Some untested and their use is not monitored. may be at risk herbal teas contain laxative herbal As a result, knowledge of their potential ingredients such as senna and cascara. In side-effects is limited. This makes Pregnant/nursing mothers: Few general stimulant laxative preparations areidentification of the safest and most conventional medicines have been not recommended during pregnancy and effective therapies and promotion of their established as safe to take during the use of unstandardized laxative rational use even more difficult. If pregnancy and it is generally recognized preparations is particularly unsuitable35, 36. phytotheraphy is to be promoted as a that no medicine should be taken unless the benefit to the mother outweighs any source of healthcare, efforts must be made Pediatric use: Herbal remedies should to promote its rational use, and possible risk to the foetus. This rule should be used with caution in children and identification of the safest and most also be applied to herbal medicinal medical advice should be sought if in effective therapies will be crucial. products. However, herbal products are doubt. Chamomile is a popular remedy often promoted to the public as being used to treat teething pains in babies. References natural and completely safe alternatives However, Chamomile is known to contain 1. De Smet PAGM, The role of plant derived drugs to conventional medicines35. Many herbs allergenic sesquiterpene lactones and and herbal medicines in healthcare, Drugs, should not be used during pregnancy, or 1997, 54, 801-840. should therefore be used with caution. The when nursing. These include Aloe, administration of herbal teas to children Angelica, Anise, Arnica, Ashwagandha, 2. Blumenthal M, Harvard study estimates needs to be considered carefully and consumers spend $5.1 billion on herbal Cascara, Comfrey, Cubeb, Ephedra, professional advice may be needed35. products? HerbalGram, 1999, 45, 68-74. Feverfew, Gymnema, Juniper, Lemongrass, Licorice, Lobelia, Myrrh, Parsley, Elderly: A recent review has considered 3. Blumenthal M, Herb industry sees mergers, Rhodiola, Sarsaparilla, Senna and Uva acquisitions, and entry by pharmaceutical the evidence available on the use of a Ursi36. giants in 1998, HerbalGram, 1999, 45, number of herbal medicinal products by 67-68. Many herbs are traditionally the elderly people. Whilst the treatments reputed to be abortifacient and for some like St. John’s Wort, Valerian, Ginkgo may 4. MCA Press Releases: Concern over Quality and this reputation can be attributed to their Safety Standards of Traditional Chinese offer considerable benefits for a range of volatile oil component. A number of Medicines, September 2001. conditions, there is need for caution when volatile oils are irritant to the genito- herbal medicinal products are used by the 5. MCA Notifications on Safety of Kava-kava urinary tract if ingested and may induce elderly particularly with regard to products, December 2001-July 2002. 62 Natural Product Radiance
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