Examlex
The two biggest self-prescribed uses of melatonin are as prevention for the common cold and as a reproductive aid.
Amphetamines
Drugs that stimulate neural activity, causing speeded-up body functions and associated energy and mood changes.
Barbiturates
Drugs that depress the activity of the central nervous system, reducing anxiety but impairing memory and judgment.
Depressant
A substance that reduces arousal or stimulation, affecting the central nervous system.
Stimulant
A substance that raises levels of physiological or nervous activity in the body.
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