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Psychoactive drugs are generally grouped into five major categories:

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stimulants, depressants, opiates, hallucinogens, and antipsychotics.

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Stimulants in general increase behavioral level, possibly even to extreme levels.

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Cocaine it a stimulant.

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Depressants, in general, do the opposite to stimulants.  They decrease behavioral activity.

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Alcohol is a common depressant.

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Opiates, also called narcotics, are drugs that in general have both elevate mood and provide pain relief.

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Many of the most powerful pain relievers are narcotics. Heroin and morphine are narcotics.

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Hallucinogens are so categorized because they alter perception and can lead to hallucinations.

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LSD and marijuana are hallucinogens.

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Antipsychotics are drugs that are used to treat many symptoms associated with schizophrenia, such as hallucinations and thought disorders.

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Thorazine was the first antipsychotic marketed.

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Antidepressants are drugs that are used to treat symptoms associated with depression

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such as the low mood and the lethargy.