Sandeep Lahiry1, Rajasree Sinha2, Sayanta Thakur3. 1. Department of Pharmacology, R. G. Kar Medical College, Kolkata, West Bengal, India. 2. Department of Pediatrics, Medical College and Hospital, Kolkata, West Bengal, India. 3. Department of Pharmacology, Institute of Post Graduate Medical Education and Research, Kolkata, West Bengal, India.