A substance or stimulus that acts against or opposes the effects of another stimulant.
From Latin 'contra-' (against) plus 'stimulant' (something that stimulates or excites). A technical medical or pharmacological term for an opposing or neutralizing stimulus.
In neuroscience, when your brain gets over-stimulated by caffeine, a 'contrastimulant' like magnesium can help calm your nervous system down by working against the excitatory effects.
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