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Prevalence of herbal and traditional medicine in Ethiopia: a systematic review and meta-analysis of 20-year studies

Systematic Reviews volume 12, Article number: 232 (2023) Cite this article

Abstract

Background

The widely accepted prevalence of traditional medicine (TM) in Ethiopia was about 80 %, of which 95 % were sourced from plants. The purpose of this study was to update knowledge of the prevalence of herbal medicine or TM in Ethiopia and describe the characteristics of the population mostly relying on herbal medicine or TM to inform health policy-makers.

Methods

PubMed, Google Scholar, Hinari, Scopus, and the Directory of Open Access Journals (DOAJ) were searched. The methodological quality of each included study was assessed using the quality assessment checklist for prevalence studies. Meta-analysis was conducted using STATA version 17, and the heterogeneity between studies was assessed using I2 test statistics based on the random effect model. Forest and funnel plots were used to present the data. Subgroup analysis was done by the study population, region, and setting.

Results

Thirty-six studies with a total of 16,288 participants met the inclusion criteria. Meta-analysis of the study revealed that the prevalence of herbal medicine use in Ethiopia is 46 % (95 % CI, 37–54 %), with significant heterogeneity among the studies (I2 = 99.19 %). Egger’s test for publication bias of herbal medicine use revealed significant results (Egger, P = 0.002) which indicates possible missing of small sample size studies. The prevalence of TM use in Ethiopia is 65 % (95 % CI, 52–77 %) with significant heterogeneity among the studies (I2 = 99.18 %). Egger’s test for publication bias of TM use revealed non-significant results (Egger, P = 0.275). The subgroup analysis by the study setting and the region revealed variability amongst the studies. Community-based studies and Oromia National Regional State showed higher prevalence. By population type, a higher prevalence of TM use was observed amongst children and lowest amongst malaria suspects.

Conclusions

The current study revealed that TM/herbal medicine utilization remained an important source of primary healthcare in Ethiopia. In comparison to the commonly reported prevalence of TM/herbal medicine, there is a considerable decline in TM/herbal medicine prevalence. High TM/herbal medicine use tendency during pregnancy necessitates safety studies to optimize the utilization.

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Background

The World Health Organization (WHO) defines traditional medicine (TM) as “the sum total of the knowledge, skill, and practices based on the theories, beliefs, and experiences indigenous to different cultures, whether explicable or not, used in the maintenance of health as well as in the prevention, diagnosis, improvement or treatment of physical and mental illness” [1]. For a number of reasons, TM is highly valued and widely used around the world. The TM/herbal medicines with strong scientific evidence on their safety profiles, sufficient efficacy, and quality contribute to the goal of ensuring that all people have access to standard health care. This made TM/herbal medicines highly valued assets [1, 2].

Herbal medicine according to WHO is a practice which includes herbs, herbal materials, herbal preparations, and finished herbal products, that contain active ingredients parts of plants, or other plant materials, or combinations [3]. It encompasses the combination of practices of indigenous systems of medicine and several therapeutic experiences of many previous generations [4]. Main plant parts used in herbal medicine include leaves, stems, flowers, roots, and seeds [5]. Herbal medicines are asserted to cure diabetes, jaundice, hypertension, tuberculosis, mental disorders, Acquired Immunodeficiency Syndrome (AIDS), cancer, skin diseases, and many other infectious diseases [4].

The use of medicinal plants as a fundamental component of the African traditional healthcare system is the oldest with a long track record and is widely acknowledged among all therapeutic systems. In many parts of rural Africa, traditional healers prescribing medicinal plants are the most easily accessible and affordable health resource available to the local community and at times the only treatment modality that exists [6]. The TM in Africa is holistic involving both the body and the mind and traditional healers offer information, counseling, and treatment to patients and their families in a personal manner [6]. Patients’ preference, the low ratio of medical doctors to the total population, and the lack of effective modern medical treatment for some ailments in Africa are additional factors for the wider practice of traditional medicines.

According to the WHO, 70–80 % of Africans today depend either totally or partially on TM [1]. Traditional medicine is widely practiced in Ethiopia. It is used to treat diverse forms of human diseases including cancer, hypertension, diabetes, bacterial infections, parasitic infections, and many more [7,8,9,10,11]. Over 80 % of the Ethiopian population also relies on TM according to a report as old as 1986 [12], and more than 95% of the preparations are made from plant origin [13]. This represents the majority of the rural population and sectors of the urban population where there is little or no access to modern health care [14].

The recent study in 2016 by the WHO’s Study on Global Ageing and Adult Health (SAGE) revealed that the widely accepted notion that 80 % of Africans and Asians rely on TM stands no more [15]. For instance, it was <3 % in Ghana and <2 % in South Africa, which is much less than what previous reports claimed [15]. The present systematic review and meta-analysis aimed to update knowledge of the prevalence of TM/herbal medicine in Ethiopia. In addition, it aims to point out the characteristics of the population mostly relying on TM/herbal medicine to inform health policy-makers to harness its potential contribution to health, wellness, and people-centered healthcare and promote safe and effective use through the regulation of products, practices, and practitioners as indicated in the WHO TM strategy 2014–2023 [1].

Materials and methods

Search strategy

Published and unpublished research papers (e.g., MSc/PhD thesis) reporting the prevalence of TM/herbal medicine in different settings: during pregnancy, for infants (children), for adults, in urban settings, and in rural settings even involving health professionals at the institution or community level were included. The search domains included Google Scholar, local university repositories—for unpublished research, international abstracting, and indexing databases such as SCOPUS, PubMed, Hinari, ScienceDirect, Web of Science, EBSCO, and Directory of Open Access Journals (DOAJ).

In designing the search strategy, participants, intervention, comparator, and outcome (PICO) were used. The participants of this study were the Ethiopian population. The intervention is TM including herbal medicine. Since this is the prevalence comparator, the outcome was not used in designing the search term.

The key terms/phrases used for searching were Ethiopia, plants, medicinal plants, traditional medicine, traditional knowledge, herbs, indigenous knowledge, folk medicine, ethnobotany, ethnopharmacology, ethnomedicine, medico-cultural, prevalence, proportion, and use rate. Based on the information above, the following search terms were applied in different databases. (1) Traditional medicine OR medicinal plant* OR herb* OR indigenous knowledge OR traditional knowledge OR folk medicine OR folk remedies OR home remedies OR ethnobotan* OR ethnopharmacolog* OR ethnomedicin* ethnopharmaceutic* OR medico-cultural; (2) Prevalence OR proportion OR Use rate; and (3) Ethiopia*. The search maps used in PubMed were as follows: ((traditional medicine OR medicinal plant* OR herb* OR indigenous knowledge OR traditional knowledge OR folk medicine OR folk remedies OR home remedies OR ethnobotan* OR ethnopharmacolog* OR ethnomedicin* ethnopharmaceutic* OR medico-cultural) AND (prevalence OR proportion OR use rate)) AND (Ethiopia*).

First, the titles and abstracts were screened and then suitable articles were downloaded and examined against the inclusion criteria. Published and unpublished ethnobotanical and ethnomedicinal surveys reporting the prevalence or proportion of the population using herbal medicine or TM in Ethiopia were included. Review articles, historical documents, experimental studies, data lacking information on study areas, prevalence of use, and not reporting information about traditional medicinal plants were excluded.

Risk of bias assessment

The methodological quality of each included study was assessed using the quality assessment tool for prevalence studies developed by Leboueuf-Yde and Lauritsen and then modified by Hoy and colleagues [16, 17]. Graphs of the summary of the risk of bias were developed using RevMan 5.3 (Cochrane Informatics and Knowledge Management Department, London, UK).

Data extraction

Data were extracted using a Microsoft Excel spreadsheet. The characteristics of extracted data in each study include first author name, year of publication, area of study (region), study setting (community or institution-based), number of study participants, response rate, characteristics of study participants (population type), age of study participants, frequency of herbal medicine use, frequency of TM use, and most frequently used herbal medicine.

Data analysis

Statistical analyses were conducted using STATA version 17.0 (StataCorp, LP, College Station, TX). The prevalence was pooled using the MetaProp command in STATA. The heterogeneity of the studies was assessed using the I2 statistic, and significance was declared at I2 > 50 %. Because of significant heterogeneity among the studies, the random-effects model (REM) was used to estimate the pooled prevalence and 95 % CI using the DerSimonian and Laird methods. The Freeman-Turkey double arcsine transformation was used to avoid missing prevalence near or at 0 and 1 from the meta-analysis. Subgroup analysis was done by region, study setting, and population type. The presence of publication bias was tested using Egger’s test. Forest and funnel plots were constructed to display the individual studies and pooled results. The data were computed by Cochrane Collaboration’s software, RevMan 5.3.

Results

Characteristics of included studies

Database and other relevant source searching resulted in 790 articles of which 36 met the inclusion criteria, enrolling a total of 16,288 participants. The included studies published were for 20 years from 2002 to 2022 (Fig. 1).

Fig. 1
figure 1

PRISMA flow diagram depicting studies identified, screened, selected, and included

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Of these studies, 16 were from the Amhara National Regional State; nine from Oromia National Regional State; three from Addis Ababa City Administration; three from Harari Peoples’ National Regional State; two from South Nations, Nationalities and Peoples Regional State; and one each from Southwest Ethiopia National Regional State, Benshangul-Gumuz National Regional State and in health centers from Addis Ababa and Bati, North Central Ethiopia. Twenty of the studies were conducted at institutions such as hospitals and health centers, and the remaining 16 studies were community-based studies. Twelve studies were conducted on pregnant women; nine in the general population, four in parents with children, three among HIV/AIDS patients, two among diabetic patients, two among hypertensive patients, and one each in HIV/AIDS and TB co-infected patients, cancer patients, malaria suspected patients, and among older adults. The general characteristics of included studies; regions where the studies were conducted, population type, the study setting, sample size, response rate, age groups, prevalence of herbal medicine, and TM use; and most frequently used herbal medicines were depicted in Table 1.

Table 1 The characteristics of the included studies
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Quality assessment of the included studies

A low risk of bias was observed in all of the included studies in terms of the source of data collection as all of them were directly collected from the participants. In terms of non-response bias, acceptable case definition, and instrument used, almost all studies have shown a low risk of bias. About half of the included studies have shown a high risk of bias in terms of representing the national population, sampling frame, and random sampling technique. The risk of bias assessment summary and the graph are presented in Fig. 2A and B.

Fig. 2
figure 2

Risk of bias assessment. Risk of bias summary (A). Risk of bias graph (B)

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Prevalence of herbal medicine use in Ethiopia

Meta-analysis of the study revealed that the prevalence of herbal medicine use in Ethiopia is 46 % (95 % CI, 37–54 %), and there was significant heterogeneity among the studies, I2=99.19 % (Fig. 3). Egger’s test for publication bias revealed significant result (Egger, P= 0.002) which indicates possible missing of small sample size studies.

Fig. 3
figure 3

Forest plot depicting the prevalence of herbal medicine use in Ethiopia

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The studies included were significantly heterogeneous as the statistical test revealed; visual inspection of the funnel also revealed the scatted distribution of the prevalence values (Fig. 4).

Fig. 4
figure 4

Funnel plot of prevalence of herbal medicine use distribution effect size estimation

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Subgroup analysis of the study by region revealed that there is heterogeneity among studies as indicated in Table 2. The mixed (Addis Ababa and Bati) showed a higher prevalence of herbal medicine use compared to all other regions while Addis Ababa showed the lowest prevalence. Community-based studies showed a higher prevalence of herbal medicine use compared to institutional-based studies. More studies were conducted among pregnant women, higher prevalence of use of herbal medicine was observed amongst cancer patients and lowest among malaria suspects.

Table 2 Results of subgroup analysis of herbal medicine use prevalence by region, study setting, and population type
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The trends analysis revealed that most of the studies (91.7 %) were conducted between 2014 and 2022. The heterogeneity was visible regardless of the year of the study (Fig. 5).

Fig. 5
figure 5

Trends in herbal medicine use in Ethiopia

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Prevalence of traditional medicine use in Ethiopia

Meta-analysis of the study revealed that the prevalence of TM use in Ethiopia is 65 % (95 % CI, 52–77 %). There was significant heterogeneity among the studies, I2=99.18% (Fig. 6). Egger’s test for publication bias revealed non-significant results (Egger, P=0.275).

Fig. 6
figure 6

Forest plot depicting the prevalence of traditional medicine use in Ethiopia

Full size image

The studies included were significantly heterogeneous as it was for the prevalence of herbal medicine use; visual inspection of the funnel also reveals a scatted distribution of the prevalence values (Fig. 7).

Fig. 7
figure 7

Funnel plot of prevalence of traditional medicine use distribution effect size estimation

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Subgroup analysis of TM use by region revealed that there is variability among studies as indicated in Table 3. Community-based studies showed a higher prevalence of TM use compared to institutional-based studies though non-significant. The Oromia National Regional State showed a higher prevalence of TM use compared to all other regions while Southwest Ethiopia showed the lowest use prevalence. A higher prevalence of TM was observed among children and lowest among malaria suspects.

Table 3 Results of subgroup analysis of traditional medicine prevalence by region, study setting, and population type
Full size table

Trends in traditional medicine use in Ethiopia

Trends analysis revealed that most of the studies were conducted between 2016 and 2022. Heterogeneity is visible regardless of the year of study (Fig. 8).

Fig. 8
figure 8

Trends in traditional medicine use in Ethiopia

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Discussion

The present finding revealed that the prevalence of 65 % (95 CI %, 52–77 %) TM and that of the herbal medicine prevalence of 46 % (95 CI %, 38–56 %) are much less than the previously established prevalence. The long-standing value that 80 % of Ethiopians rely on TM and of which 95 % is sourced from herbal medicine is far from the present truth. Traditional medicine is an integral part of healthcare as an alternative healthcare delivery system especially in low- and middle-income countries encompassing Latin America, Africa, and Asia [1, 54, 55]. In Ethiopia, according to the official population projection of the Central Statistical Agency (CSA) 2019, 79.77 % of the Ethiopian population lives in rural parts of the country [56]. The rural area is characterized by poor infrastructural settings with scarce or no modern facilities to provide primary healthcare. The TM is sometimes the only accessible and affordable alternative primary healthcare among such rural communities [1]. African TM/herbal medicine is used for various human ailments such as cancer, hypertension, HIV, and use during pregnancy follows similar trends to that of Ethiopian TM/herbalism [57,58,59,60].

Among the herbal medicines reported in the present study, there are ubiquitously used herbs as foods or dyes by the general population in daily lives. For instance, Zingiber officinale (Ginger), Ruta chalepensis (Tena Adam), Allium sativa (Garlic), Ocimum lamiifolium (Damakase), Thymus vulgaris (Tosign), Lepidium sativum (Feto), Trigonella foenum-graecum L. (Absh (fenugreek), and Linum usitatissimum (telba (Flax seeds)) are among the reported herbal medicines and further contributed to the increase in the prevalence [61, 62]. These are common dietary supplements/spices and are also commonly used herbs for medicinal purposes.

The trend analysis of the studies revealed that the majority of the studies with proportions of herbal medicine use were conducted between 2014 and 2022, the last 8 years (Table 4). This finding further signifies that the old figures of TM/herbal medicine prevalence needed updating and hence the present finding can be referred to as the current prevalence of TM/herbal medicine in Ethiopia.

The present finding that a lower socio-economic status, unemployment, and rural residence where access to modern health facilities is scarce were associated with high TM/herbal medicine use is in agreement with other reports [63, 64]. The WHO’s study on Global Ageing and Adult Health (SAGE) also determined that the TM prevalence in six populous middle-income countries such as China, Ghana, India, Mexico, Russia, and South Africa is much lower than has previously been reported and those who do make use of TM are more likely to be socio-economically disadvantaged corroborates the present finding [15].

The most regularly cited reasons for TM/herbal medicine use in the present finding disclosed are closeness to residency, cultural acceptability, trust by the general population, ease of access, affordability, and dissatisfaction with modern medicine also supported by other reports elsewhere [15, 63,64,65]. In some high-income countries, the TM usage is reported to be high. For instance, Australia (48 %), Canada (70 %), France (75 %), the UK (51.8 %), and the USA (42%) of the population use TM [66,67,68]. In those countries, unlike the low- and middle-income countries, the reason for high TM usage is due to the assumption that TMs are safer than allopathic medicines [69].

The most frequently cited TM other than herbal medicine included bone setting, use of the spiritual water (“tsebel”), prayer (faith healing), massage, cauterization, traditional birth attendance, and tooth extraction. This finding is in agreement with reports from other African countries [70].

In our report, most of the TM/herbal medicines were used to treat health conditions experienced during pregnancy, malaria, TB, HIV/AIDS, hypertension, cancer, and the like. Among the users, pregnant women are commonly practicing. As pregnant mothers are more likely to risk groups for potential toxicity derived from herbal remedies which eventually affect the fetus, creating awareness of general use and potential risks of herbal remedies need to be addressed through the health policy system [18].

The current study is highly heterogeneous as observed from I2. The source of this heterogeneity could be from the methodological quality, geographic and cultural variations, smallness of the included studies, intrinsic variability in the population, and formal synthesis of comparable data. Moreover, eligible studies included in the current study were from some of the administrative regions in Ethiopia and thus may not comprehensively represent the national TM or herbal medicine use. Therefore, to determine the prevalence of TM or herbal medicine at the national level, the large-scale prospective study which represents all administrative regions and city councils should be considered.

In this study, we have collected, compared, and interrogated the dataset of herbal and TM prevalence using systematic reviews and meta-analysis of currently available evidence. Although the studies included may not be from all over Ethiopia, all published TM or herbal medicine prevalence reporting studies from Ethiopia were thoroughly analyzed. Significant heterogeneity observed may be a reflection of the poor methodological quality of included studies and geographical and cultural variations. In addition, all of the included studies were conducted in small particular localities and non-representative convenient sampling techniques were also employed. Therefore, the limitations of the current study arose inherently from the characteristics of the included studies.

Conclusion

In conclusion, the study revealed that TM/herbal medicine utilization remained an integral source of primary healthcare in Ethiopia. In comparison to the commonly reported prevalence of TM/herbal medicine, there is a considerable decline in TM/herbal medicine prevalence. This might be due to improved access to modern healthcare facilities which could be related to rapid urbanization, slight improvements in rural infrastructures, and public awareness of allopathic medicine. The vast majority who still rely on TM/herbal medicine basically is due to a lack of access to these allopathic medicines with affordable prices. Therefore improving the livelihood of the majority poor and making modern medicines easily accessible with low or affordable prices is highly recommended. The high tendency of TM/herbal medicine use during pregnancy is a finding that is of concern. This calls for urgent regulatory measures from the government and needs to be supported by robust scientific studies for the safety of both the mother and the fetus.

Availability of data and materials

All data generated or analyzed are included in the manuscript.

Abbreviations

CAM:

Complementary and Alternative Medicine

CI:

Confidence Interval

HIV/AIDS:

Human Immunodeficiency Virus/Acquired Immunodeficiency Syndrome

TM:

Traditional Medicine

SNNPR:

Southern Nations, Nationalities and Peoples Region

WHO:

World Health Organization

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Authors and Affiliations

  1. Department of Biology, Hawassa College of Teacher Education, Sidama National Regional State, P. O. Box 115, Hawassa, Ethiopia

    Nigatu Tuasha

  2. School of Laboratory Sciences, College of Medicine and Health Sciences, Hawassa University, P. O. Box 1560, Hawassa, Ethiopia

    Sintayehu Fekadu

  3. School of Pharmacy, College of Medicine and Health Sciences, Hawassa University, P. O. Box 1560, Hawassa, Ethiopia

    Serawit Deyno

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NT conceived and designed the study, curated and extracted the data, and drafted the manuscript. SF extracted the data and conducted the quality and trend analysis. SD conducted the data analysis, interpreted the results, and assess the methodological quality. All authors revised, edited, and approved the final manuscript.

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Tuasha, N., Fekadu, S. & Deyno, S. Prevalence of herbal and traditional medicine in Ethiopia: a systematic review and meta-analysis of 20-year studies. Syst Rev 12, 232 (2023). https://doi.org/10.1186/s13643-023-02398-9

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Keywords

Systematic Reviews

ISSN: 2046-4053