Neuropharmacology is the division of pharmacology which deals with the action of drugs in the nervous system. Behavioral Neuropharmacology and Molecular neuropharmacology are the subdivisions of neuropharmacology. Behavioral neuropharmacology is the study about how drugs affect human behavior (neuropsychopharmacology), and addiction affect human brain. Behavioral and Molecular fields are very carefully connected, since both are concerned with the interactions. In neuropharmacology we also know about the drugs and their targets that influence the functions of the nervous system (brain, spinal cord and peripheral nerves) in health and disease.