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By Brianna Kerr
One of the most common and useful ways of classifying a drug is by the effect that it has on a person's central nervous system. The brain is the major part of the central nervous system, and this is where psycho-active drugs have their main effect.
The major classifications of drugs including stimulants, depressants and hallucinogens. Some drugs can be classified in a number of categories, e.g. cannabis and ecstasy.
The group 'others' includes those psycho-active drugs that do not fit neatly in any other category.
Speed up the activity of a person's central nervous system (CNS) including the brain.
These drugs often result in the user feeling more alert and more energetic.
Examples:
Slow down the activity of the CNS, which often results in the user feeling less pain, more relaxed and sleepy.
Examples:
Alter a user's sensory perceptions by distorting the messages carried in the CNS. A common example is LSD (trips).
Hallucinogens alter one's perceptions and states of consciousness.
Examples:
Psycho-active drugs that do not fit neatly into one of the other categories, but which are clearly psycho-active, such as antidepressants and mood stabilizers.
Examples: