ALCOHOL
A widely used CNS depressant that enhances GABA and inhibits glutamate, producing disinhibition, sedation, and significant dependence risk.
Alcohol disrupts the balance between inhibitory and excitatory neurotransmission; acute exposure favors inhibition while chronic exposure induces compensatory changes leading to tolerance and withdrawal syndrome upon cessation (Valenzuela, 1997). Alcohol significantly impairs both innate and adaptive immune function, increasing susceptibility to bacterial and viral infections, with chronic use promoting proinflammatory responses central to alcoholic liver disease and pancreatitis (Szabo & Saha, 2015). Hangover pathology involves alcohol metabolites, neurotransmitter alterations, inflammatory factors, and mitochondrial dysfunction, though human hangover studies suffer from poor methodological control (Palmer et al., 2019). Chronic heavy consumption reduces testosterone levels and impairs male reproductive function at the hypothalamic, pituitary, and testicular levels (Emanuele & Emanuele, 1998). Research on alcohol's neurobiobehavioral effects in women remains underrepresented despite evidence of significant neuropsychological compromise (Nixon et al., 2023).