|Pharmacology which is the branch of medicine and biology deals with the study of drug action in which psychiatric pharmacology deals with study of the drugs which have effect on thinking, mood, sensation and behavior. The drugs which effects nervous system are known as psychoactive drugs. Psychoactive drugs interact with particular receptors or target sites found in the nervous system to induce widespread changes in physiological or psychological functions. The open access journals are peer reviewed scholarly journals. The open access journals are freely available on the public internet domain, allowing any end users to read, download, copy, distribute, prink, search or link to the full texts of the articles. These provide high quality, meticulously reviewed and rapid publication, to cater the insistent need of scientific community. These journals are indexed with all their citations noted. The top open access journals are indexed in MEDLINE, PUBMED, SCOPUS, COPERNICUS, CAS, EBSCO and ISI.