This document provides information about central nervous system stimulants. It was submitted by Group 8 to Sir Azmat Rasheed and discusses cerebral, medullary, and spinal stimulants. It defines each type of stimulant based on its site of action in the central nervous system and provides examples such as amphetamines as cerebral stimulants, picrotoxin as a medullary stimulant, and strychnine as a spinal stimulant. The document also discusses the mechanisms of action and clinical uses of these stimulants as well as their side effects including convulsions.