Methods: Acute oral toxicity study of aqueous and methanol extracts was carried out by administration of 10, 100, 1000, 1600, 2900 and 5000 mg/kg body weight of N. campestris extracts to rats in the respective groups. Sub-acute toxicity study was conducted by oral administration of the extracts at daily doses of 100, 300 and 600 mg/kg body weight to another group of rats for 28 days, while rats in the control group received 0.5 mL of normal saline.