African Journal of Traditional, Complementary and Alternative Medicines, Vol. 8, No. 1, 2011, pp. 45-60
HERBAL REMEDIES AND THEIR ADVERSE EFFECTS IN TEM TRIBE TRADITIONAL MEDICINE IN TOGO
Tchadjobo Tchacondo, Simplice D.
Karou*, Komlan Batawila2 , Amegninou Agban1 , Kawiwou
Ouro-Bang’na1 , Kokou T. Anani1 , Mensavi Gbeassor1 , Comlan de Souza1
1 Centre de Formation et de Recherche sur les Plantes Médicinales (CERFOPLAM), Université de Lomé,
Code Number: tc11008
In Africa, up to 80% of the population relies on herbal concoctions for their primarily health care. In Togo, western Africa, Tem tribe is a population with old knowledge of medicinal plants, however, still very little is known about their medical practices. The present study was conducted to access for the apprehension of adverse effects of traditional remedies by Tem traditional healers (TH). Enquiry was performed by interviews with healers from August to October 2007 in Tchaoudjo prefecture (Togo). The study allowed us to interview 54 TH including 41(75.93%) males and 13(24.07%) females, who cited 102 recipes assumed to have adverse effects. The recipes were used alone to cure several diseases including haemorrhoids (22.55%), female sexual disorders and infertility (21.57%), gastrointestinal disorders (18.63%), and malaria (6.86%). A total of 34 plants belonging to 21 families were cited to be components of the recipes. Euphorbiaceae and Mimosaceae families were the most represented, however, Nauclea latifolia, Khaya senegalensis, Pseudocedrela kotschyi and Xeroderris stuhlmannii were the main components of recipes linked to adverse effects. A total of 20 adverse effects were linked to the administration of theses drugs, and among them; diarrhoea, abdominal pains, polyuria, general weakness and vomiting were the most frequently encountered. These findings were in accordance with several reports of the literature concerning medicinal plants, although they were based on empirical observations. Laboratory screenings are needed to access for the effectiveness as well as the possible toxic effects of the recipes.
Keywords: traditional concoctions, medicinal plants, adverse effects, Togo.
Plants continue to play a key role in health care systems in Africa, indeed up to 80% of people rely on traditional medicine (TM) for their primarily health care (WHO, 2009; Hostettman and Marston 2002). Because of this strong dependence on plants, a large number of studies have been conducted on traditional usage of plants and some often showed scientific rationale or resulted in the isolation of bioactive compounds for direct use in medicine (Castellanos et al., 2009; Karou et al., 2007a,b). However, still very little is known about African traditional medicine when compared to European and Asian systems (Ndhlala et al., 2009). The majority of works have been focussed on laboratory studies using plant extracts prepared by scientists after collecting plant materials themselves. The extractions are made with organic solvents such as chloroform, methanol or ethanol; sometimes they make decoctions in accordance with traditional practices (Akomo et al. 2009; Ouattara et al., 2007; Karou et al., 2006; Olila et al., 2001). The frequent scientific rational behind plants usage have stimulated a worldwide integration of TM with primary health care. However, the prescription and the use of traditional medicine in developing countries are not regulated, the main risk being the misadministration of toxic plants (Fennell et al., 2004). Nowadays, it is evidence that in developing countries people are using traditional concoctions, although very few works have been conducted on these vegetable drugs directly provided by traditional healers (TH); in fact the manufacturing of labelled and packaged herbal concoctions with claims to cure a wide range of diseases is still new in Africa. The recipes and preparations are of TM origin while the packaging and presentations are western; of course they still lack western safety and quality controls (Gertsch, 2009; Ndhlala et al., 2009).
Even modern drugs that pass safety and quality control tests have adverse effects; what about the traditional remedies? Plants commonly used in TM are assumed to be safe but this safety is based on their long usage in the treatment of diseases according to knowledge accumulated over centuries (Fennell et al., 2004). However, many studies demonstrated that some plants used as food or remedies are potentially toxic (Tchacondo et al., 2002, 2007; Maiga et al., 2005). As a consequence, some intoxication after consumption of plant remedies have been reported (Tchacondo et al., 2003a,b; Greenwald et al., 1996). The present study globally aimed to assess the apprehension of adverse effects of traditional remedies by TH. More especially we would like to: i) assess some recipes used to cure several diseases, ii) assess the main averse effects that may be linked to the administration of these products, iii) assess the scientific rationale of theses findings according to the literature.
Central Region is one of the 5 administrative regions of Togo, a western African country. It lies between 0°15’-1°35' north and 8°-9°15' east. The region is made up of 4 prefectures : Tchaoudjo, Tchamaba, Sotouboua, Assoli (Figure 1), and is bordered to the north by Kara Region, to the west by Republic of Ghana, to the East by the Republic of Benin and to the south by Plateaux Region. It consists of a total area of 13,430 sq. km and occupies approximately 23.73% of the total 56 6000 sq. km. land area of Togo mainland. The region belongs to tropical zone with one rainy season from April to October and one dry season from October to March. It receives 1200 to 1500 mm total rainfall annually. The annual temperatures are between 20 and 32°C. The vegetation is essentially constituted of tree and bush savannah with excellent biodiversity of medicinal plants. The present study was carried out in Tchaoudjo prefecture. The prefecture is inhabited by 180,400 people, the main ethnic groups being the Tem people. Islam and animism are the main religions of the inhabitants; and agriculture and trade their principal activities. The prefecture has one Regional Hospital, 32 dispensaries and 3 pharmacies. For data collection, 54 healers were interviewed and the prefecture was divided into 5 districts: the centre with 68.52% TH; the east, 14.82% TH; the west 3.70% TH; the north 11.11% TH and the south 1.85% TH.Figure 1
Direct interviews with TH were performed between August and October 2007 using a semi structured questionnaire, after their informed consent. Each TH was asked to sign a consent form certifying his/her agreement with the form which was edited to explain the importance of the information they would provide. All TH were members of the Study and Research in Applied Traditional Medicine Centre of the Central Region in Togo (CERMETRA-RC). CERMETRA-RC is a non-governmental organisation created in August 2001. The organisation involves traditional healers of four prefectures of the Central Region in Togo. The goals of CEMETRA-RC are the formation and the counselling of TH about the management of patients and the preservation of the environment principally, the protection of vulnerable vegetable species used in traditional medicine. The organisation has a centre where TH follow up their patients and a botanic garden where they grow desired species. The organisation works in collaboration with researchers of University of Lomé. The interviewed TH were from Tchaoudjo prefecture (Figure 1). Questions asked were about the plants used in the preparation of remedies, the method of preparation of the remedies, the diseases the remedies are assumed to cure, the used parts of the plants, details of administration, the dosage and the adverse effects of their remedies. A remedy was included in the study if the TH himself recognised the presence of adverse effects after consumption of his product by patients. When any adverse effect was not shown by patients the products was not included in the study.Plant identification
After interviews, preliminary identification of the plants was done in the field by a botanist. Afterwards, herbarium specimens were prepared and photographs were taken to aid in the confirmation of the identity of the plants. Plant identities were confirmed by comparison with available voucher specimens in the Herbarium of the Botany Department of University of Lomé.Data analysis
MS Excel spread sheets were used to make simple calculations and determine plant frequencies. The Informant consensus factor (ICF) was calculated for each category to identify the agreements of the informants on the reported cures for malaria symptoms. The ICF was calculated as follows: number of use citations in each category (Nuc) minus the number of species used (Ns), and divided by the numbers of use citations in each category minus one (Njoroge and Bussmann, 2007):
Moreover, the fidelity level (Fl) was computed to determine the most important species used by the healers according to (Teklehaymnot, et al., 2007) as follows: frequency of citation of a species for a specific ailment (Fc) divided by the total number of citations of that species (Ft).
In the present study, 54 TH including 41(75.93%) males and 13(24.07%) females freely accepted to answer to our questionaire). Table 1 shows data on the age, the educational level and the occupation of the TH. The ages could be divided in six age groups as indicated in the Table. The median age was 44 years and 60% of TH were between 30 and 50 years old. According to Table 1, the majority of the THs (48.16%) were illiterates, 33.33% were of primary school level and 18.52% of secondary school level. Trade and agriculture were the main activities of the healers; however, the majority of the healers (80.70%) were farmers.Plants materials used in the concoction and formultations
Different parts of the plants were used for the concoctions; these were roots, stems, leaves, barks, fruits (Figure 2). Sometimes the whole plant was used to prepare the recipes. All the portions could be used alone or in association with other parts. In our inquiry, roots (38%) and stems (22%) were the most frequently used. The recipes were essentially in 3 formulations including powders (48%), decoctions (39%) and maceration (13%).
Plants, recipes, and therepeutic indications
A total of 102 recipes assumed to have adverse effects were cited by healers. The recipes were used alone to cure several diseases including haemorrhoids (22.55%), female sexual disorders and infertility (21.57%), gastrointestinal disorders (18.63%), and malaria (6.86%) as indicated in Table 2. Each recipe could be made of a single plant or an association of 2 to 7 different plants at least. Overall, 34 plants were cited to be components of the recipes. The 34 plants belonged to 21 families as indicated in Table 3 which lists the plants and their local names. Euphorbiaceae and Mimosaceae families were the most represented with 4 species each. Melliaceae and Fabaceae were represented by 3 species each. The other families were represented by one or two species.
Number of citations and informant consensus factor
Data collected with healers revealed that a plant species could be used in the treatment of many diseases. According to Table 3, Nauclea latifolia (27 citations), Khaya senegalensis (26 citations), Pseudocedrela kotschyi (14 citations) and Xeroderris stuhlmannii (13 citations) were the most used plants. Thus these plants had low fidelity levels because of their multiple usages. Plants that were cited once were used to treat only one disease such as Lannea kerstingii, Kigelia africana or Maytenus senegalensis had very high fidelity levels (100%). High consensus factors were recorded for haemorrhoids (0.75), female sexual disorders and infertility (0.63) and malaria (0.61). The lowest informant consensus was recorded with gastrointestinal disorders (0.45).
Number of citations and informant consensus factor
In the present study, the interviewed TH freely accepted that some of recipes they use to manage diseases possess adverse effects. This was based on patients’ complaints. According to our results, haemorrhoids, female sexual disorders and infertility, gastrointestinal disorders and malaria were the most cited diseases cured by the recipes, thus the study was focussed on the adverse effects of the recipes used in the treatment of these diseases.
Haemorrhoids: A total of 23 recipes assumed to cure haemorrhoids were found to have adverse effect. All recipes were administrated by oral route except PH-23 which was administrated via rectum in addition to oral route. These recipes were prepared from 17 plants according to Table 4a, b, c. Single plants (Trichilia emetica or Khaya senegalensis) or an association of 2 to 5 plants at least were used to cure haemorrhoids. All the parts of the plants were used in the preparation of the recipes but the roots of plants were the most frequently used parts. The recipes were essentially powders or decoctions. Khaya senegalensis, Nauclea latifolia, Pseudocedrela kotschyi, Trichilia emetica and Vitellaria paradoxa were the major plants used to cure haemorrhoids by being components of 17, 12, 6, 5 and 5 of the 23 recipes respectively (Table 4a, b, c). According to the THs several adverse effects were linked to the administration of their drugs. In the case of haemorrhoids, 17 adverse effects were listed. Among them, diarrhoea polyuria and general weakness accounted for 69.57% (16/23), 60.87% (14/23) and 56.52% (13/23) remedies, respectively.
Female sexual disorders and infertility: The interviewed THs cited 22 recipes based on 20 plants for the treatment of female sexual disorders and infertility (Table 5). As for haemorrhoids, the recipes could be made of single plants or a combination of 2 to 5 different plants. Xeroderris stuhlmannii, Vitellaria paradoxa and Anthocleista djalonensis were used alone to cure female sexual weakness. However, Xeroderris stuhlmannii (11/22), Khaya senegalensis (8/22) and Milletica thonningii (6/22) were the most frequently cited in the concoction of the products. The adverse effects linked to these products were essentially general weakness and polyuria in 59.09% (13/22) and 40.09% (9/22) cases, respectively over the 13 adverse effects cited by TH (Table 4a, b, c). <Malaria: Seven recipes made of 12 plants assumed to cure malaria were linked to adverse effects. No single plant was cited to cure the disease. All the recipes were made of combination of 3 to 5 plants at least. The most frequently cited plants were Nauclea latifolia (5/7), Pseudocedrela kotschyi (5/7), Prosopis africana (4/7) and Trichilia emetica (4/7). Six adverse effects were linked to the administration of the products. Among them polyuria (7/7) and diarrhoea (6/7) were the most cited (Table 7a, b).
The present study aimed to assess traditional recipes used by Tem people to cure several diseases and that are assumed to possess adverse effects. The enquiry allowed us to interview 54 TH who provided us 102 recipes and the diseases they are assumed to cure.
All the products were plant-based remedies; no additional product was used in the concoction of the remedies. But additives such as honey or milk may be added to the preparation for oral administration, principally in the case of bitter remedies to improve taste. A peculiarity with Tem people, indigenous of Togo central region, is that, they have no traditional alcohol drink. Thus no alcohol is added in their preparations, in contrast with Togo southern people who have “Sodabi” distilled from palm wine and the northern people who have “Tchakpalo” and “Tchoukoutou” local beer prepared from sorghum. In addition, as they are mainly Muslims, many Tem TH claimed that they do not accompany their practices with animal sacrifices.
Haemorrhoids, female sexual disorders, infertility, gastrointestinal disorders and malaria were the most cited. These diseases accounted for 66.81% (71/102) of recipes. Haemorrhoid is a disease well known in TM and TH use numerous plants for its management. Cathode campanulas a and Ficus Exasperata in Cameroon (Focho et al., 2009), Achyranthes aspera, Allium cepa, Combretum racemosum and Monodora myristica in Nigeria (Ajibesin et al., 2008), Piliostigma thonningii and Cochlospermum tinctorium in Mali (Togola et al., 2005) Ziziphus spina-christi by Yemenite Jews (Dafni et al., 2005) are the mains examples. Considering the recipes proposed against haemorrhoids by Tem TH, Khaya senegalensis, Nauclea latifolia, Pseudocedrela kotschyi, Trichilia emetica and Vitellaria paradoxa were the most usually used. Among these plants, Trichilia emetica is of common usage with above mentioned plants, this suggests certain similarities in plants usage between Tem TH and other TH.
Many plants have been used in Africa as remedies to regulate the menstrual cycle, enhance fertility and as either abortifacients or antiabortifacients (Steenkamp, 2003). According to our results, Xeroderris stuhlmannii, Khaya senegalensis and Milletica thonningii were the most cited as being a part of recipes proposed against female sexual disorders and infertility by Tem TH. There are very few reports on these plants in this topic; the literature only reports the use of Trichilia emetica in the treatment of such diseases. Thus, in eastern Africa, the root bark decoction is used to make women fecund and in Senegal the leaf decoction is used against blennorrhoea (Burkill, 1997), however these findings need to be confirmed by laboratory screenings. In contrast Nauclea latifolia which is not frequently used by Tem people in the treatment of female sexual disorders and infertility has shown a good in vitro estrogenic activity (Njamen et al., 2008). In addition, Anthocleista djalonensis which is used as single plant in the management of sexual disorders in the present study has been found to exert good antimicrobial activity against non-gonococcal urethritis bacteria (Okoli and Iroegbu, 2004).
The following plants: Nauclea latifolia, Khaya senegalensis and Pseudocedrela kotschyi most cited in the present study as being the components of recipes used in the treatment of stomach-ache or gastrointestinal disorders are well known for their activity against several pathogens responsible for gastroenteritis. Khaya senegalensis for example has a good antimicrobial activity related to its polyphenols contents (Karou et al., 2005). Nauclea latifolia was found to exert antibacterial, anthelminthic, Antiamoebic and spasmolytic activities in laboratory screenings (Onyeyili et al., 2001; Fakae et al., 2000; Tona et al., 2000). The antibacterial and antiparasitic activities of Pseudocedrela kotschyi are also well documented (Kassim et al., 2009; Asase et al., 2008; Ogundiya et al., 2006).
Malaria is the most important parasitic disease that causes major health problem in Africa. In Togo, the disease accounts for up to 15% hospitalisations. Indeed, THs have long experience in the management of the disease. Many Togolese medicinal plants have been screened for the in vitro antiplasmodial activity (Karou et al., 2003; Gbeassor et al., 1989). These screenings often show scientific rational behind plant usage in the management of malaria by Togolese TH. In the present study, Nauclea latifolia, Pseudocedrela kotschyi, Prosopis africana and Trichilia emetica were the most cited in the treatment of malaria. All these plants have been screened with success for their in vitro antimalarial activity. Among these plants, Nauclea latifolia is the best known antimalarial plant according to recorded results (Asase and Oppong-Mensah, 2009). A total of 20 adverse effects linked to the administration of theses drugs were cited. Overall, five adverse effects were common to all these recipes; these were diarrhoea, abdominal pains, polyuria, general weakness and vomiting. Some studies reported that these were the main adverse effects often encountered after consuming vegetable drugs (Togola et al., 2005; Castot et al., 1997; Chan et al, 1994). Indeed, Langasou et al. (1994) reported that gastroenteritis was the main adverse effect linked to the oral administration of plant-based remedies. In addition Greenwald et al. (1996) reported that female with sexual disorders often presented abdominal pains, general weakness and vomiting after treatment with Chinese herbal remedies.
Our results indicated that 5 plants Khaya senegalensis, Nauclea latifolia, Pseudocedrela kotschyi, Trichilia emetica and Posopis africana were the main components of recipes linked to adverse effects. Some of these plants are already known in the literature for their adverse effects. The toxic effects of Khaya senegalensis, particularly the seeds of the plant were earlier reported (Kerharo and Adam, 1974). Maiga et al (2005) reported that diarrhoea and vomiting were the toxic effects of Trichilia emetica, however, these adverse effects could be expected according to literature, since the plant is used as an emetic and a purgative against poisoning in some regions particularly in eastern Africa (Malgras, 1992).
The healers often claim that the adverse effects are generally due to an overdose of the remedy however, the expected effect of the remedy may be diarrhoea, such as in the cases of constipation and intestinal worms. In addition, for intoxication treatment, the patient is supposed to eliminate the poisons by vomiting. According to the healers the adverse effects are generally moderate and should disappear at the end of the treatment. The commonly used remedy against diarrhoea and vomiting is a cold bath; another plant part can be used when the adverse effect is violent and stopping of the treatment is recommended.
The main difficulty of the study was that; sometimes, the same name was attributed to different plants by healers, or that gender (male or female) may be attributed to plants that were from different families. In these two cases, specimens were collected and examined with healers to have a consensus on the local name of the plants. This study showed that collaboration between scientists and TH is possible as they freely accepted to give us their recipes. This may be beneficial for scientists, TH and patients. The study also allowed us to assess the adverse effects linked to the administration of several traditional remedies. An important point of the study is the fact that TH freely accepted that their drugs may have adverse effects; however this is often based on empirical observations. In fact, certain adverse effects such as vomiting could be of nutritional origin or linked to the disease itself. In addition some patients often use modern drugs in association with traditional remedies so the adverse effects could be the results of the interactions of the two drugs. These are data we could not analyse because we had no access to them. We could not also assess the mortality linked to the administration of these remedies. Some of the recipes proposed by TH were in accordance with reports in literature showing similarities in plants usage between Tem TH and other TH in the rest of the world. The study also demonstrated the scientific rational behind plant usage by TH but most of recipes need to be investigated through pharmacological, toxicological and phytochemical studies to ascertain the effectiveness as well as the possible toxic effects.Acknowledgments
The authors gratefully thank the staff of CERMETRA-RC and all the healers who took part in this study.
Appendix 1: TH identity
Appendix 2: Remedies
Copyright 2011 - Afr. J. Trad. CAM
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