Drugs which speed up activity in the central nervous system are classified as

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Stimulants are drugs that enhance the activity of the central nervous system, resulting in increased alertness, attention, and energy levels. Examples of stimulants include caffeine, cocaine, amphetamines, and nicotine. Hallucinogens alter perceptions and mood and can cause hallucinations, but they do not necessarily speed up activity in the central nervous system. Depressants slow down activity in the central nervous system, and opiates are a type of depressant that produces pain relief and feelings of euphoria.

Drugs Which Speed Up Activity in the Central Nervous System