With repeated use of most psychoactive drugs, the immediate pleasant effect become less strongly pleasant and the unpleasant aftereffects become more strongly unpleasant.
A psychoactive drug, also known as a psychotropic drug, is a chemical substance that alters nervous system functions, resulting in changes in perception, mood, consciousness, cognition, or behavior. These substances can be used for medical, recreational, or spiritual purposes; to improve performance or alter consciousness; as entheogens for ritual, spiritual, or shamanic purposes; or for research. Physicians and other healthcare practitioners prescribe certain types of psychoactive drugs that have therapeutic value.
Psychoactive drugs or substances frequently cause subjective changes in consciousness and mood that the user may find rewarding, pleasant, or beneficial in an objectively observable or measurable way (e.g. increased alertness). Substances that are rewarding and thus positively reinforcing have the potential to induce addiction - compulsive drug use in the face of negative consequences.
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