According to World Health Organization (WHO), approximately 3 million pesticide poisoning occurs worldwide and more than 40,000 deaths per year. 1 Among pesticide poisoning, organophosphate(OP) poisoning is one of the most common causes of poisoning in developing countries. 2 Based on the onset of the signs and symptoms of OP poisoning, it is categorized into acute (minutes to 24 h), delayed (24 h-2 weeks), and late (beyond 2 weeks). 3 The activity of muscarinic and nicotinic receptors causes acute onset symptoms. Muscarinic symptoms include salivation, lacrimation, urination, defecation, gastric cramps, emesis, bradycardia, hypotension, miosis, and bradycardia. Weakness, fasciculation, cramps, and paralysis are all nicotinic symptoms. The delayed onset nicotinic symptoms are intermediate syndrome. 4 Intermediate syndrome (IMS) usually develops after 2-4 days of oral OP poisoning. It occurs in around 20% of OP poisoning cases. The paralysis of respiratory muscles and paralysis of the peripheral