The toxicity of Rhazya stricta leaves for Najdi sheep is described in 9 sheep assigned as untreated controls, Rhazya-treated at 0.25 g/kg/d and Rhazya-treated at 1 g/kg/d. The oral use of 1 g/kg/d caused body weight depression, ruminal bloat, diarrhea, dyspnea and weakness of the hind limbs.