Prozac and Alcohol: What Happens When You Drink
Doctors advise against drinking on Prozac, mainly because the two add to drowsiness and alcohol can deepen low mood.
By withClaro Editorial · 2026-11-02 · 4 min read
Clinical section reviewed by Dr. Jason Tan , Consultant Psychiatrist, on October 27, 2026.
Key takeaways The NHS says it's best not to drink on fluoxetine, and the patient guide in the FDA label says not to drink alcohol while using Prozac. In 72 r/prozac threads, getting drunk faster was the effect people named most often, followed by bad hangovers and blackouts. Skipping Prozac to drink does nothing: fluoxetine and its active form stay in the body for weeks. Alcohol can deepen low mood and anxiety, which can look like the medication is failing. On this page
What people on r/prozac say happens when they drink Why do people get drunk faster and black out on Prozac? Is it dangerous to mix Prozac and alcohol? Can alcohol make depression worse on Prozac? What should you tell your prescriber about drinking? How can you lower the risk if you do drink? It's best not to drink alcohol on Prozac (fluoxetine), the NHS says, because alcohol can increase side effects such as feeling very drowsy. The patient guide in the FDA label is stricter: it says not to drink alcohol while using Prozac, and that Prozac can make you sleepy and affect how clearly you think and how quickly you react. The reason is not one dangerous reaction: the effects stack, and the low mood can come the next day.
What people on r/prozac say happens when they drink
Of 71 people on r/prozac who said whether their drinking changed, 62 cut down or stopped. Getting drunk faster was the effect they named most, then bad hangovers and blackouts. These are people's own accounts, not trial figures, and people with a bad night post more, so treat them as a range of experiences rather than odds. We read 72 recent threads about alcohol on r/prozac, comments included, and 259 people described drinking on Prozac themselves.
Of the 259, 162 said what it did to them, and one person can name several effects:
What they noticed Of 162 people Got drunk faster 65 Bad or longer hangovers 46 Blackouts 31 Low mood or anxiety the next day 25 Felt sick or vomited 21 A weaker buzz 16 No difference 15
One person on r/prozac wrote:
very low tolerance - I get drunk very quickly
Another noticed less of a change:
My hangovers look different but nothing else.
Why do people get drunk faster and black out on Prozac?
Both act on the brain. The label says Prozac can cause sleepiness and slow thinking and reactions, and alcohol does the same, so a usual amount can hit harder. That stacking is a likely reason for feeling drunk sooner and for blackouts, which are memory gaps while drunk.
Is it dangerous to mix Prozac and alcohol? Medically reviewed by Dr. Jason Tan on October 27, 2026, this section only.
MedlinePlus says alcohol can make the side effects of fluoxetine worse. NIAAA lists drowsiness, dizziness and stronger feelings of depression or hopelessness among the risks of mixing alcohol with antidepressants. If you have liver disease, fluoxetine stays in the body even longer: in people with cirrhosis its half-life averaged 7.6 days, against 2 to 3 days without liver disease, and the label advises a lower or less frequent dose. The clinical view:
Alcohol slows the brain down. It can deepen low mood and anxiety, especially the next day, and that can look like the medication is failing. Together, the two add to drowsiness and slow your reactions, which matters for driving.
If you drink or use cannabis regularly, including CBD or prescribed cannabis, or find it hard to cut down, tell your prescriber. It changes which medication and dose makes sense, and it is a conversation they have often. ## Should you skip Prozac if you plan on drinking?
No, because it changes nothing. With daily use, fluoxetine's half-life is 4 to 6 days, and its active form, norfluoxetine, 4 to 16 days, so the medicine stays in your body for weeks. A skipped dose won't clear it in time for a night out. The NHS advises taking a missed dose when you remember unless the next one is nearly due, and never doubling up.
Can alcohol make depression worse on Prozac?
It can, and it usually shows the next day. Of the 162 people on r/prozac who described what drinking did to them, 25 named low mood or anxiety the day after. If low mood keeps going on days you haven't been drinking, tell your prescriber.
What should you tell your prescriber about drinking?
Specific answers help more than a general one. Tell them:
How many drinks you have in a typical week. Whether your mood or anxiety dips the day after drinking. Whether you have skipped doses because you planned to drink. Whether you find it hard to cut down. Any blackouts, and whether you were hurt or did something risky. Low mood after drinking can turn into thoughts of harming yourself. If you're having thoughts of harming yourself, contact emergency services or a crisis line straight away. In the US, call or text 988. In the UK, call Samaritans on 116 123. Elsewhere, find a crisis line near you .
How can you lower the risk if you do drink?
If you decide to drink before you have spoken to your prescriber, a few steps lower the risk. They come from NHS and NIAAA advice on cutting down, plus the drowsiness warning for fluoxetine:
Eat before you drink, and have a glass of water first. Alternate alcoholic drinks with water or other non-alcoholic drinks. Count your drinks and decide your limit before you start. Do not drive if you feel drowsy or dizzy, and that includes the next morning. Drink with people you trust, so someone is with you if you black out. Download on the App Store Alcohol can change mood, sleep and energy for a day or two after drinking. The withClaro app lets you log mood, sleep, energy and side effects each day, linked to your dose, and turns it into a report for your prescriber.
Frequently asked questions Can I have one drink on Prozac? The NHS advises not drinking on fluoxetine, and the FDA patient guide says not to drink while using it. Whether any amount is sensible for you is a question for your prescriber.
How long after taking Prozac can I drink? Fluoxetine stays in the body for weeks, so there is no gap in hours that separates the two. Tell your prescriber how much you usually drink and agree what is sensible for you.
Can drinking on Prozac cause blackouts? Some people on r/prozac report them: 31 of 162 who described drinking on Prozac. If it happens to you, tell your prescriber soon rather than waiting for your next appointment.
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Sources NHS: Fluoxetine PROZAC (fluoxetine) prescribing information, US Food and Drug Administration via DailyMed NIAAA. Harmful interactions: mixing alcohol with medicines MedlinePlus: Fluoxetine NHS. Tips on cutting down alcohol NIAAA, Rethinking Drinking. Tips to try Claro articles are for self-monitoring and educational purposes only. They are not a medical device, therapist, or diagnostic tool, and do not replace care from your prescribing clinician. If you are in crisis, contact your care team, emergency services, the Samaritans (UK: 116 123), or the Crisis Text Line (US: text HOME to 741741).