This episode examines ethanol as one of the most widely used—and most underestimated—psychoactive drugs. Alcohol’s effects span neurotransmission, reward, inhibition, and autonomic control, with acute and chronic consequences that differ profoundly. By treating ethanol with the same pharmacological seriousness as any other CNS agent, we uncover why its benefits are transient, its harms cumulative, and its clinical footprint so broad.

Key takeaways you’ll build and reuse throughout the series:

* Ethanol as a CNS depressant with complex actions: GABA enhancement, glutamate inhibition, and dopaminergic reinforcement.

* Dose and time as determinants: intoxication, tolerance, dependence, and withdrawal explained mechanistically.

* System-wide effects: impacts on cognition, coordination, sleep, metabolism, liver, and cardiovascular function.

* Acute versus chronic use: why patterns of exposure matter more than single episodes.

* Clinical translation: recognising intoxication, managing withdrawal safely, and understanding interactions with other sedatives.

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