Overview on pharmacovigilance of nephrotoxic herbal medicines used worldwide
Clinical Phytoscience volume 7, Article number: 9 (2021)
There is a growing use of herbal medicines worldwide. Especially in patients with chronic diseases such as kidney disease, when numerous studies have shown a generalized high prevalence [1,2,3,4]. However, there are concerns about herbal medicines and their ability to produce harmful effects. Examples from the literature have clearly shown the association between the use of herbs and kidney disease [5, 6]. The increasing use of herbal medicines has increased the need to monitor their safety. Thus, the approach recommended by the World Health Organization (WHO) was to include herbal medicines in existing national pharmacovigilance systems . The pharmacovigilance of medicinal plants or phytovigilance involved the evaluation of the risks and benefits of phytotherapy. The ultimate goal is to protect patients from herbal harm  . It is essential to develop reliable information on the safety of herbal medicines . Becoming necessary due to risks of toxicity (acute or chronic) or risks of drug interactions (of pharmacokinetic or pharmacodynamic nature), as regards interactions between several associated plants, phytovigilance also represents a legal obligation . Several issues related to how herbal medicines are named, perceived, obtained and used . At international level, the WHO published guidelines on pharmacovigilance of herbal medicines . However it is still a new activity in the majority of countries of Africa. Except in Morocco where a pharmacovigilance program in phytotherapy was created in 2000 . Also the creation of Botanicus and Phytotox . This situation requires knowledge, recognition and monitoring of adverse reactions through pharmacovigilance of herbal medicines activities [12, 13]. In order to show renal sides effects of herbal medicines use and current need to monitor phythovigilance worldwide, systematic research was carried out on PubMed, Science direct and Scopus. Moreover, some accessible databases on pharmacovigilance of herbal medicine or phytovigilance were consulted (Table 1). The aim of this article was to provide an overview of nephrotoxicity associated with the use of herbal medicines.
Materials and methods
Electronic literature searches were conducted in Mai 2020 to identify case reports of nephrotoxicity associated with herbal medicines use in the last two decade. The scientific resources including PubMed, Scopus, and Science direct were searched using key words such as: ‘case report’, ‘Renal side effect’, ‘adverse effects’, ‘Nephrotoxicity’, ‘Risk’, ‘Herbal Medicine’, ‘kidney disease’. The spectrum of herbal induced kidney injuries included kidney stones, nephritis, nephrotic syndrome, necrosis, acute kidney injury, chronic kidney disease, and death. English articles were the primary focus, but some reports in other languages were considered.
Inclusion and exclusion criteria
Eligible studies had to fulfil the following criteria: Included studies were case reports of nephrotoxicity associated to herbs use worldwide between 2000 and 2020.
Exclusion criteria: Case reports were excluded if they involved mushrooms, poisonous plants, self-harm, excessive doses (except vitamins/minerals), drug-herbal interactions and commercial dietary supplement.
Study selection and data extraction
Studies titles retrieved by the search were assessed for inclusion by one reviewer and a sample of excluded titles was checked by a second reviewer: no instances of discrepancy were found. Potentially relevant abstracts and full texts were assessed by two reviewers and any discrepancies resolved through discussion. Data were extracted by one reviewer and checked by a second. The causality was assessed by using Naranjo causality assessment scale , adapted us described in our recent publication .
Description of studies included
The comprehensive search retrieved over 15,303 citations and 47 of them were examined in full text (Fig. 1). Eighty-five percent of the studies were excluded. As a result, 27 eligible studies were included. The key data from these reports are summarized in Table 1.
Adverse effects of herbal medicines and need of phythovigilance
Case reports of renal side effects associated to herbs usage worldwide
In our search, twenty seven case reports of nephrotoxicity related to the consumption of herbs were identified around the world from Southeast Asia, Korea, South and North Africa, Turkey, Tunisia and from Belgium. The renal reactions involved mostly males (18/27 = 66%), between 22 and 68 years old. The characteristics of cases are reported in Table 1.
Various renal syndromes were reported after the use of medicinal plants, including acute tubular necrosis, acute interstitial nephritis, acute kidney injury, and chronic renal failure.
Reports of nephrotoxicity associated with herbal medicines use encompass all forms of renal dysfunction, ranging from acute to chronic renal failure and death.
The herbal medicines most commonly associated with nephrotoxicity were: Dioscorea quinqueloba, Lawsonia inermis, Cassia senna L., Artemisia herba-alba, Chenopodium polyspermum, Cape aloes, Euphorbia paralias, Crataegus orientalis, Colchicum autumnale and Tribulus terrestris.
The causality assessment between consumption of herbal preparation and renal reaction, carried out according to Narranjo method, resulted as certain in four cases, probable in seven cases and as possible in fifteen cases. Other details on adverse reactions are described in Table 1.
Why is Phytovigilance of nephrotoxic herbal medicines important in nephrology?
A phytovigilance system needs to be established in order to assess renal adverse effects caused by herbal medicines. Many recommendations were published to dress this issue; some of them are summarized in Table 2.
The use of traditional herbal medicine is common worldwide. Indeed, up to 80% of the population relied on herbal concoctions for their primarily health care , . Herbal products are preferred because they are natural. In addition, they are considered “safe” and “have fewer side effects” than “synthetic drugs”. On the other hand, plants contain a number of active ingredients that produce a physiological effect in the body . This overview aimed to highlight nephrotoxicity of herbal medicines use in the last two decade. Even rare, reported cases of kidney side effects associated with the use of herbal medicines were very serious worldwide. Indeed we noted twenty seven case reports of nephrotoxicity related to herbal medicines. Another review found that 44 reported cases of nephrotoxicity were associated with herbal or dietary supplements worldwide . Nephrotoxic herbs most reported were:
Henna is a traditional cosmetic agent and is used worldwide, not only as a cosmetic agent but also is applied to the body on lesions in the treatment of seborrheic dermatitis or fungal infections. Different pathologies have been described as caused by henna. For this reason people should be informed about the side-effects of topical henna application and clinicians should be aware of these manifestations . Lawsone (2-hydroxy-1,4 naphthoquinone) is a chemical agent present in henna [4,5,6]. It has been shown to cause severe haemolytic anaemia and renal tubular necrosis in animals . Most reports of henna toxicity have been attributed to adding a synthetic dye para-phenylenediamine (PPD). Indeed unreliable quality can be a problem. In particular, this poses a risk when herbal medicines are contaminated (e.g. with heavy metals) or adulterated (e.g. with prescription drugs) . Another example for herbs contamination nephrotoxicity was ayurvedic supplement from India, which contained high levels of several heavy metals including those of mercury, lead, arsenic and manganese. In fact, previous overview reported that herbal medicinal products were adulterated or contaminated with dust, pollens, insects, rodents, parasites, microbes, fungi, mould, toxins, pesticides, toxic heavy metals and/or prescription drugs. The most severe adverse effects caused by these adulterations were agranulocytosis, meningitis, multi-organ failure, perinatal stroke, arsenic, lead or mercury poisoning, malignancies or carcinomas, hepatic encephalopathy, hepatorenal syndrome, nephrotoxicity, rhabdomyolysis, metabolic acidosis, renal or liver failure, cerebral edema, coma, intracerebral haemorrhage, and death. Adulteration and contamination of herbal medicinal products were most commonly noted for traditional Indian and Chinese remedies, respectively .
Cassia acutifolia and angustifolia plants are widely used as laxatives. The mechanism of renal injury remains debatable. Massive loss of fluid and electrolytes during laxative abuse may cause renal dysfunction. Moreover, a direct cytotoxic effect on the tubular cells may also be involved, as it has been shown that anthraquinone derivatives may be accumulated in the kidneys , .
Crataegus spp. (hawthorn) monopreparations are predominantly used for treating congestive heart failure. Data from the literature indicated that hawthorn is rarely associated with serious adverse events. However, the unsupervised use of this drug can be associated with problems, especially if given with concomitant medications .
Artemisia herba-alba, Artemisia herba-alba Asso (Asteraceae) essential oil contained in majority: cis-chrysanthenyl acetate (25.12%); (2E,3Z) 3,5-heptadienal- 2-ethyliden-6-methyl (8.39%); α-thujone (7.85%); myrtenyl acetate (7.39%); verbenone (7.19%), chrysanthenone (4.98%) .
The Aloe plant is employed as a dietary supplement in a variety of foods and as an ingredient in cosmetic products. The widespread human exposure and its potential toxic and carcinogenic activities raise safety concerns. Chemical analysis revealed that the Aloe plant contained various polysaccharides and phenolic chemicals, notably anthraquinones . Ingestion of Aloe preparations is associated with diarrhea, hypokalemia, pseudomelanosis coli, kidney failure, as well as phototoxicity and hypersensitive reactions .
belonging to the family Dioscoreaceae, the most important identified compound from Dioscorea species is diosgenin .
From the most reported renal adverse effect we noted acute interstitielle nephritis and acute kidney injury; which is similar with other study .
Tripterygium wilfordii’s nephrotoxic power is well known. According to a recent systematic review and meta-analysis on its nephrotoxicity, the incidence rate of nephrotoxicity in Tripterygium wilfordii Hook. F preparations was 5.81% . A single case report of Tripterygium wilfordii hook F’s renal and cardiac toxicity in a 36-yr-old man has been reported. Three days after ingesting thunder god vine extract, the patient presented with profuse nausea, vomiting, diarrhea, leukopenia, renal failure, hypotension, and extensive cardiac abnormalities. The patient died 3 d after presentation from intractable shock. The authors could not differentiate the cause of this patient’s renal dysfunction, postulating that it could have been supplement-induced nephrotoxicity, in conjunction with prolonged shock .
Colchicum autumnale is an herbaceous plant in the liliaceae family. Accidental poisonings by this plant generally result from a botanical confusion, with other edible herbaceous liliaceae; wild leek (Allium polyanthum) or wild garlic (Allium ursinum). This confirms that a simple confusion when identifying a plant deemed edible can have particularly deleterious consequences for patients .
Chinese herbal medicine has been practiced for the prevention, treatment, and cure of diseases for thousands of years. Some of the nephrotoxic components from herbs are aristolochic acids and other plant alkaloids . A recent review has listed case reports of nephrotoxicity due to Chinese herb species containing aristolochic acid . The kidney manifestations of nephrotoxicity associated with Chinese herbal medicine included acute kidney injury, CKD, nephrolithiasis, rhabdomyolysis, Fanconi syndrome, and urothelial carcinoma .
Glycyrrhiza glabra (licorice) Natural licorice is extracted from Glycyrrhiza glabra root containing glycyrrhizin or glycyrrhizic acid in sufficient quantities it affects blood pressure and causes other health issues. Licorice has been involved in the renal disease by inhibiting major renal transport processes needed for filtration, secretion, and absorption . Hence, licorice should be carefully monitored for its use in patients with renal problems .
However, we observed the absence of some much known nephrotoxic plants in the two last decade, it is notably Ephedra species , Tripterygium wilfordii hook F . What shows some phytovigilance that needs to be more increased.
Several reviews have listed a list of nephrotoxic plants and have proposed several recommendations concerning the fight against this use , . Which shows the interest of creating a pharmacovigilance system for these plants particularly for nephrology.
The potential of natural products to cause renal dysfunction is justifiable. It is imperative that the use of natural products be closely monitored in all patients. Healthcare professionals should take an active role in identifying patients using natural products and providing appropriate patient education . Indeed we summarized some published recommendations in this way.
Herbal medicine uses medicinal plants prepared by means of adapted extracting technologies and appropriate pharmacological preparations, purified and standardized in their chemical principles. As with any form of therapy, there are possible side effects, contraindications, pharmacological interactions. It is considered necessary that a basic knowledge of the pharmacological aspects of herbal medicine be included in the regular course of medicine . Plant extracts can have kidney toxicity due to their inherent properties. If they exhibit some degree of toxicity, the risks can be weighed against the benefits and decisions can be made regarding their continued availability, in a manner similar to that currently done for nephrotoxic pharmaceutical agents. Importantly, the inherent properties of the herb are not the only source of kidney problems associated with plants, as plant-drug interactions, errors in dosing and identification, and contaminants in the mixture are all of concern.. Strict controls on the presence of adulterants in herbal medicines, labeling of dosages and contraindications and manufacturing techniques must be maintained to ensure the safety of consumers of medicinal plants .
Herbal medicine seemed to present a real risk for the kidney. Case reports from the literature have clearly shown the association between the use of herbs and the occurrence of nephrotoxicity worldwide. Hence the need to incorporate a phythovigilance system in the nephrology service, especially in Africa and Asia.
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Touiti, N., Houssaini, T.S. & Achour, S. Overview on pharmacovigilance of nephrotoxic herbal medicines used worldwide. Clin Phytosci 7, 9 (2021). https://doi.org/10.1186/s40816-021-00248-6