Key Takeaways: How Alcohol Affects Your Brain

• Core Classification: Alcohol is scientifically and medically classified as a central nervous system (CNS) depressant.
• The “Upper” Illusion: Low doses initially trigger a release of dopamine, creating a temporary stimulant-like effect (euphoria, energy, and reduced inhibitions).
• The “Downer” Reality: As you continue to drink, the depressant effects take over, leading to slowed reaction times, impaired judgement, and sedation.
• The Tequila Myth: Contrary to popular belief, tequila is not a stimulant; all alcoholic beverages contain the same depressant chemical (ethanol).
• The Aftermath: The post-drinking dopamine crash often leads to “hangxiety”—a state of heightened anxiety and low mood the next day.

Is Alcohol a Stimulant or a Depressant?

Alcohol is technically and officially classified as a depressant. While it can mimic the effects of a stimulant during the first drink or two, its primary and lasting impact is the slowing of your bodily functions.

Because it initially boosts sociability and energy, many people mistakenly believe it belongs in the same category as caffeine or nicotine. However, the initial rush of energy is temporary and quickly overshadowed by alcohol’s true nature. Ultimately, the more you consume, the more your physical and mental processes are suppressed.

Why is Alcohol a Central Nervous System (CNS) Depressant?

Alcohol is a CNS depressant because it actively slows down brain function, reaction times, and coordination. It achieves this by enhancing the effects of gamma-aminobutyric acid (GABA), a neurotransmitter that inhibits and slows down nerve activity.

At the same time, alcohol suppresses other neural pathways responsible for keeping you alert. This combination of heightened GABA and suppressed alertness is what leads to slurred speech, clumsiness, and drowsiness. If consumed in excess, this profound depression of the nervous system can lead to unconsciousness or alcohol poisoning.

Is Alcohol an Upper or Downer?

In clinical terms, alcohol is a “downer” because its dominant effect is to depress the central nervous system. “Uppers” (stimulants) increase heart rate, blood pressure, and alertness, whereas “downers” do the exact opposite.

While that first glass of wine or beer might make you feel temporarily uplifted, this is just the first phase of how your body processes the substance. Once your blood alcohol concentration reaches a certain threshold, the “downer” effects become unavoidable. You will experience a loss of coordination, sluggishness, and heavily impaired decision-making skills.

Why is Alcohol a Depressant When it Makes Me Happy?

Alcohol makes you feel happy initially because it triggers a rapid, temporary release of dopamine in the brain. Dopamine is the neurotransmitter responsible for feelings of pleasure, motivation, and reward.

This creates a “biphasic effect,” meaning your body’s response happens in two distinct phases. Phase one feels like a stimulant due to the dopamine rush, giving you a boost of confidence and euphoria. Phase two is the depressant phase, where the dopamine drops off, GABA takes over, and sedation sets in.

This sharp drop in dopamine is also responsible for the severe emotional crash many people experience the next day. My colleague here at Counselling in Melbourne, Lilia Reis, frequently works with clients navigating this exact experience. She explains the clinical reality of this rebound effect:

“Clients commonly describe ‘hangxiety’ as a next-day rebound state marked by heightened anxiety, negative self-talk, shame spirals, low mood, irritability, and a pervasive sense of dread following alcohol use. Clinically, this reflects the post-intoxication drop in dopamine alongside increased central nervous system sensitivity, with clients often reporting feeling ‘flat, on edge, emotionally fragile, and stuck in overthinking’ the day after drinking.”

To manage this rebound anxiety, Lilia suggests a grounding psychological approach:

• Reframe the experience: Remind yourself that this is physiological. Simple internal reminders like “this will pass” or “this is my nervous system recalibrating” can reduce the intensity of the response.
• Step back from negative self-talk: Gently notice the shame-based thinking without engaging with it.
• Focus on the present: Do not analyse the night before; focus on stabilising the present moment and allowing the body and mind to settle.

The Tequila Myth: Is Tequila a Stimulant?

No, tequila is not a stimulant; it is a depressant just like every other form of alcohol. The myth that tequila is an “upper” likely stems from the cultural context in which it is consumed, such as taking shots in high-energy party environments.

Chemically, the active intoxicating ingredient in tequila is ethanol. Ethanol is the exact same molecule found in vodka, whiskey, beer, and wine. Because the chemical composition is identical, tequila interacts with your central nervous system in the exact same way, ultimately acting as a downer.

The Link Between Alcohol, Anxiety, and Depression

Regular alcohol consumption can significantly worsen the underlying symptoms of depression and anxiety over time. While many people use a drink to unwind or self-medicate after a stressful day, this habit ultimately alters the brain’s natural chemistry.

Because alcohol artificially manipulates dopamine and GABA, the brain stops producing these regulating chemicals effectively on its own. This creates a vicious cycle where you feel worse when you are sober, prompting you to drink again just to feel normal. Relying on a depressant to cope with low moods will almost always exacerbate the very mental health issues you are trying to escape.

Getting Support at Counselling in Melbourne

If you find that your drinking habits are negatively impacting your mental health, relationships, or daily life, professional support can make a profound difference. It can be difficult to break the cycle of self-medication alone, but evidence-based psychological therapies can help you regain control.

At Counselling in Melbourne, our team is experienced in helping clients navigate the complex relationship between substance use and mental health. Whether you are looking for dedicated alcohol addiction counselling or need strategies to manage underlying anxiety, we provide a safe, non-judgemental space to support your recovery.

Please note that the information provided in this article is for educational purposes only and should not substitute professional medical or mental health advice.

ABOUT THE AUTHOR

Amelia Cambrell

My name is Amelia, and I’m a Senior Psychologist at Counselling in Melbourne. I have over 18 years of experience in the mental health space. I am very driven to get the best outcomes for my clients by using a range of evidence-based modalities, such as CBT. There is nothing more satisfying than helping adolescents, adults, and couples who are feeling confused, frustrated, stuck, or overwhelmed to find more clarity, confidence, and happiness in their lives. (With special thanks to my colleague, Lilia Reis, for her clinical insights on “hangxiety” included in this article).