Science and Education Publishing American Journal of Pharmacological Sciences 2327-672X 3 4 2015 09 23 Estimation of LD50 and Acute Toxicity of Zygophyllum fabago in Mice 94 97 EN Hasan Alhaddad Department of Pharmacology and Toxicology, College of Pharmacy, University of Baghdad, Baghdad, Iraq Ammar Amer Fadhil Sajida H Ismael AJPS2015342 10.12691/ajps-3-4-2 2015 09 16 2015 09 20 2015 09 23 Zygophyllum fabago, a member of the genus Zygophyllum, has lonely used in traditional medicine in Iraq for the treatment of many diseases. However, no studies have done to evaluate the acute toxicity of its extract. Thus, we designed this study to examine its acute toxicity and LD-50 value in mice depending on OECD 423 guidelines for testing of chemicals. Twenty-one mice were given Zygophyllum fabago extract in doses of 2000 or 5000 mg/kg. The results showed that both doses of Zygophyllum fabago extract did not show any toxic signs or mortality. Moreover, body weights and relative organs weight were not affected. Furthermore, it did not induce kidney and liver injuries. Therefore, results of this study suggested that Zygophyllum fabago extract is safe within the tested doses and did not produce acute toxicity when administered orally as a single dose.