By Tara V. Shanbhag, TARA V SHANBHAG MD Professor and Head, Department of Pharmacology Srinivas Institute of Medical Sciences and Research Centre Mukka, Surathkal, Mangalore Karnataka, India Formerly, Professor, Department of Pharmacology Kasturba Medical College, Manipal, Manipal Academy of Higher Education Manipal, Karnataka, India; Veena Nayak and Smita Shenoy, SMITA SHENOY MD Additional Professor, Department of Pharmacology Kasturba Medical College, Manipal, Manipal Academy of Higher Education Manipal, Karnataka, India