Ethnobotanical Study on the Usage of Toxic Plants in Traditional Medicine in the City Center of Tlemcen, Algeria
Traditional medicine has been part of the Algerian culture for decades. In particular, the city of Tlemcen still retains practices based on phytotherapy to the present day, as this kind of medicine fulfills the needs of its followers among the local population. The toxic plants contain diverse natural substances which supplied a lot of medicine in the pharmaceutical industry. In order to explore new medicinal sources among toxic plants, an ethnobotanical study was carried out on the use of these plants by the population, at Emir Abdelkader Square of the city of Tlemcen, a rather busy place with a high number of traditional health practitioners and herbalists. This is a descriptive and transversal study aimed at estimating the frequency of using toxic plants among the studied population, for a period of 4 months. The information was collected, using self-anonymous questionnaires, and analyzed by the IBM SPSS Statistics software used for statistical analysis. A sample of 200 people, including 120 women and 80 men, were interviewed. The mean age was 41 ± 16 years. Among those questioned, 83.5% used plants; 8% of them used toxic plants and 35% used plants that can be toxic under certain conditions. Some improvements were observed in 88% of the cases where toxic plants were used. 80 medicinal plants, belonging to 36 botanical families, were listed, identified and classified. The most frequent indications for these plants were for respiratory diseases in 64.7% of cases, and for digestive disorders in 51.5% of cases. 11% of these plants are toxic, 26% could be toxic under certain conditions. Among toxics plants, the most common ones are Berberis vulgaris with 5.4%, indicated in the treatment of uterine fibroids and thyroid, Rhamnus alaternus with 4.8% for hepatic jaundice, Nerium oleander with 3% for hemorrhoids, Ruta chalepensis with 1.2%, indicated for digestive disorders and dysmenorrhea, and Viscum album with 1.2%, indicated for respiratory diseases. The most common plants that could be toxic are Mentha pulegium (15.6%), Eucalyptus globulus (11.4%), and Pimpinella anisum (10.2%). This study revealed interesting results on the use of toxic plants, which are likely to serve as a basis for further ethno-pharmacological investigations in order to get new drug sources.
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 J. Fleurentin, Des plantes toxiques qui soignent, Ouest France ed., 2011.
 Nathalie Berthaut, Richard Blostin, Phytothérapie : A la découverte des principes actifs, (2012).
 A. Bouzid, R. Chadli, K. Bouzid, Étude ethnobotanique de la plante médicinale Arbutus unedo L. dans la région de Sidi Bel Abbés en Algérie occidentale, Phytothérapie, (2016) 1-6.
 Hammiche Victoria, Merad Rachida, Azzouz Mohamed, Plantes toxiques à usage médicinal du pourtour méditerranéen, Springer, 2013.
 J. Bruneton, Toxic plants dangerous to humans and animals, Intercept Limited, 1999.
 S. Al-Qura'n, Ethnobotanical survey of folk toxic plants in southern part of Jordan, Toxicon, 46 (2005) 119-129.
 A. Maiga, D. Diallo, S. Fane, R. Sanogo, B.S. Paulsen, B. Cisse, A survey of toxic plants on the market in the district of Bamako, Mali: traditional knowledge compared with a literature search of modern pharmacology and toxicology, Journal of ethnopharmacology, 96 (2005) 183-193.
 F. Catanese, P. Fernández, J.J. Villalba, R.A. Distel, The physiological consequences of ingesting a toxic plant (Diplotaxis tenuifolia) influence subsequent foraging decisions by sheep (Ovis aries), Physiology & behavior, 167 (2016) 238-247.
 A. Samia, Atlas des risques de la phytothérapie traditionnelle, étude de 57 plantes recommandées par les herboristes, in, (2010).
 F. Ghomari, La médina de Tlemcen : l'héritage de l'histoire Cultural Patrimony, I, ( 2007) 11-28.
 J.-P. Séréni, Heurs et malheurs d'une vieille capitale in, février 2010.
 https://www.google.dz/maps/place/La+Grande+Mosqu%C3%A9efirstname.lastname@example.org,19z/data=!4m6!3m5!1s0xd78c9bdce879c11:0xfb5ae8793908db89!4b1!8m2!3d34.8837463!4d-1.3105514?hl=fr, in.
 https://www.google.dz/maps/place/La+Grande+Mosqu%C3%A9eemail@example.com, 19z/data=!4m6!3m5!1s0xd78c9bdce879c11:0xfb5ae8793908db89!4b1!8m2!3d34.8837463!4d-1.3105514?hl=fr, in.
 D.D. Ababacar Maigaa, Seydou Fane, Rokia Sanogo, Berit Smestad Paulsen, Boubacar Cisse, A survey of toxic plants on the market in the district of Bamako, Mali: traditional knowledge compared with a literature search of modern pharmacology and toxicology, Volume 96 (4 January 2005).
 Zeggwagh Ali Amine, Lahlou Younes, Bousliman Yassir, Enquête sur les aspects toxicologiques de la phytothérapie utilisée par un herboriste à Fès, Maroc, The Pan African Medical Journal, 14 (2013).
 ONS, Office national des statistiques (Algérie), (2008).
 H. Imanshahidi M, Pharmacological and therapeutic effects of Berberis vulgaris and its active constituent, berberine, Phytotherapy research, 22 (2008).
 B.A. Sihem, Enquête ethnobotanique sur les drogues utilisées dans la médecine traditionnelle à Tlemcen, in, 2013.