GABA

GABA is the brain’s main inhibitory neurotransmitter, helping quiet neural activity and regulate sleep, anxiety and arousal.

GABA, short for gamma-aminobutyric acid, is the brain’s principal inhibitory neurotransmitter. Rather than simply making the brain “calm”, it helps regulate when neurons fire, prevents activity from escalating unchecked, and works with excitatory systems such as glutamate to keep neural networks functioning within useful limits.

This balance becomes particularly important in alcohol dependence. Alcohol affects GABA and several other signalling systems. With repeated heavy exposure, the brain adapts to functioning in alcohol’s presence. If alcohol is then removed suddenly, those adaptations can leave the nervous system excessively active, contributing to anxiety, tremor, disturbed sleep and, in severe withdrawal, seizures or delirium.

Understanding GABA therefore helps explain not only relaxation and sleep, but also tolerance, dependence, withdrawal and why suddenly stopping alcohol after prolonged heavy drinking can sometimes be medically dangerous.

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