| The central nervous system drugs industry is the rapidly growing and second largest therapeutic industry accounting for a total market value of US $ 68.7 billion. Central nervous system drugs comprise of group of those drugs for producing both psychological and physiological effects through different types of mechanisms. The central nervous system is the most important part of the human body that facilitates the proper and effective functioning of all the tissues. Out of the whole central nervous system drugs market; antidepressants, antipsychotics and anti epileptics are the largest growing segments having a market share of 23%, 22.6% and 16.8 % respectively. The key central nervous system drugs obtainable in the market are antidepressant, ergot derivative, sedative, antipsychotic, benzodiazepine and antiemtic.