Cocaine is natural coca alkaloid obtained from leaves of coca (= cocca) plantErythroxylum coca (Family Erythroxylaceae) - a South American plant growing on the foot hills of Andes. Its chemical formula is $\mathrm{C}_{17} \mathrm{H}_{21} \mathrm{NO}_4$. Cocaine is commonly called coke or crack. It is bitter, white, crystalline powder and called snow, sniff, crack, coke, princess, Big C. Cocaine has vasoconstrictor properties and therefore, is a good local anaesthetic. It is taken by snorting. It is a powerful CNS stimulant. It induces a sense of well-being and