Psychoactive drugs are the drugs which affect a person's emotions, behavior and perception. Everyone knowingly, unknowingly use these drugs in day to day life. So actually what are these drugs, types of drugs need to be known. In History psychoactive drugs are used from at least 10,000 years, ago. Mainly these drugs are classified in 4 types: stimulants; depressants; narcotics; hallucinogens. How these effect on our brain is most important. These drugs are used in various sectors like for medicinal use and some just for fun. If the drug is removed what happens to patient (withdrawal symptoms) is necessary to know. There is an act which deals with these type of drug it is Psychoactive Substances Act (PSA) which comes into force on 26th May 2016. There is forensic significance also which helps in justice in criminal and civil justice system.
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