For most antibiotics, the NHS does not tell you to avoid alcohol. It tells you that drinking in moderation is unlikely to cause problems. The blanket rule almost everybody believes is not the rule the guidance contains.
It is not pure invention either. A short list of drugs genuinely changes the answer, two of them carrying an instruction to avoid alcohol completely. One distinction runs through all of it, and most pages skip it: a label saying nothing about alcohol is not a label saying alcohol is fine.
What the NHS says about antibiotics as a class
The NHS antibiotics interactions page is the nearest thing to an official class-level answer. It says three things in sequence.
“It’s a good idea to avoid drinking alcohol when taking medicine or feeling unwell.”
“But it’s unlikely that drinking alcohol in moderation will cause problems if you’re taking the most common antibiotics.”
“However, some antibiotics can have side effects such as feeling sick or dizzy, which might be made worse by drinking alcohol.”
It then names four antibiotics. Metronidazole and tinidazole are the two it says to “completely avoid” alcohol with. Linezolid and doxycycline appear under a softer heading, “It may be best to avoid drinking alcohol if you’re taking”.
Worth noting that the page records a next review date of 11 November 2025, which has passed. Our observation is that being overdue matters more than usual on a page whose whole job is to name exceptions.
The same question, one drug at a time
The individual NHS medicines pages answer the question more directly. We fetched twelve of them on 27 August 2026.
| Antibiotic | What the NHS medicines page says about alcohol | Page last reviewed |
|---|---|---|
| Amoxicillin | “Yes, you can drink alcohol while taking amoxicillin.” | June 2025 |
| Phenoxymethylpenicillin | “Yes, you can drink alcohol with phenoxymethylpenicillin.” | January 2022 |
| Flucloxacillin | “Yes, you can drink alcohol while taking flucloxacillin.” | June 2025 |
| Cefalexin | “Yes, you can still drink alcohol with cefalexin.” | April 2023 |
| Ciprofloxacin | “Yes, you can drink alcohol with ciprofloxacin.” | December 2022 |
| Azithromycin | “Yes, you can drink alcohol with azithromycin”, with a caveat about not drinking if it makes you dizzy | January 2026 |
| Clarithromycin | The same wording and the same dizziness caveat | January 2026 |
| Trimethoprim | Alcohol is not mentioned anywhere on the page | November 2025 |
| Nitrofurantoin | “It’s best to reduce the amount of alcohol you drink if you get regular UTIs”, for bladder reasons rather than an interaction | January 2026 |
| Erythromycin | “You can eat as normal while taking erythromycin, but try to limit how much alcohol you drink.” | July 2026 |
| Doxycycline | “it’s best not to drink alcohol because it can stop the medicine working properly” | September 2025 |
| Metronidazole | “Do not drink alcohol while you’re taking metronidazole tablets or liquid or using suppositories.” | December 2025 |
Two rows there are silences rather than answers, and they are the most important.
The trimethoprim page does not mention alcohol at all. That is a verified absence, not a statement that alcohol is safe with trimethoprim. The 2020 systematic review discussed below classes the data for trimethoprim-sulfamethoxazole as “equivocal”, which describes the position more honestly than either a yes or a no.
The erythromycin row runs the other way. The NHS page tells you to limit alcohol, but when we searched the UK Summary of Product Characteristics for Erythrocin 250 Tablets, alcohol appeared nowhere in it, not in the interactions section, not in the warnings, not even as an excipient. The consumer page is more cautious than the licensed label. Our reading is that neither silence should be taken as reassurance or as warning. They are gaps, and gaps are what a pharmacist is for.
Metronidazole and tinidazole, the two named for complete avoidance
The NHS metronidazole page states: “Do not drink alcohol while you’re taking metronidazole tablets or liquid or using suppositories.” It asks you to keep avoiding alcohol for a period afterwards. We are not printing that interval, because it varies by preparation. It is on the NHS page and in your leaflet.
The reaction it describes is “feeling and being sick, stomach pain, hot flushes, a pounding heartbeat (palpitations) and a headache”, and the label calls it a disulfiram-like reaction. Whether it happens at all has been argued over since 2000 and again in 2026. We have set that out in full, including the one published death attributed to it, in metronidazole and alcohol. “Contested” is accurate. “Harmless” is not.
Tinidazole is the second antibiotic the NHS names for complete avoidance, and that is the line to follow. Do not drink alcohol while you are taking tinidazole. If you have been prescribed tinidazole and have questions about it, ask whoever prescribed it.
Linezolid, where the interaction is real but is not with the alcohol
This is the point most articles get wrong.
The NHS says linezolid “can be affected by undistilled (fermented) alcoholic drinks, such as wine, beer, sherry and lager”. The linezolid Summary of Product Characteristics explains why. Linezolid “is a reversible, non-selective inhibitor of monoamine oxidase (MAOI)”, and the label advises avoiding “excessive amounts of food and beverages with a high tyramine content (e.g. mature cheese, yeast extracts, undistilled alcoholic beverages and fermented soya bean products such as soy sauce)”.
Cheese and soy sauce are on that list. Our reading is that this is a tyramine warning rather than an alcohol warning, and that beer and wine appear because of what fermentation produces rather than because of the ethanol. That is our inference from where the label places the wording, not something the label states. Linezolid is also a specialist antibiotic rather than something handed out for a chest infection.
Doxycycline and erythromycin, where the argument is about effectiveness
Neither of these is a reaction. The claim is that the antibiotic works less well.
On doxycycline the NHS is flat, saying alcohol “can stop the medicine working properly”, while its own antibiotics page qualifies that to people “with a history of drinking heavily”. How thin the evidence underneath is, we set out in doxycycline and alcohol.
The best class-level source is Fact versus Fiction, a 2020 systematic review by Mergenhagen and colleagues in Antimicrobial Agents and Chemotherapy. Searching three databases to 2018, it reported that “oral penicillins, cefdinir, cefpodoxime, fluoroquinolones, azithromycin, tetracycline, nitrofurantoin, secnidazole, tinidazole, and fluconazole can be safely used with concomitant alcohol consumption”, and that “erythromycin may have reduced efficacy with alcohol consumption, and doxycycline may have reduced efficacy in chronic alcoholism”. That list includes tinidazole. On tinidazole, follow the NHS instruction above and avoid alcohol completely.
Its verdict on the field is the line worth carrying away. Alcohol and antimicrobial interactions “are often lacking evidence”, and the review “questions common beliefs due to poor, often conflicting data”. Amoxicillin, an oral penicillin, sits in the first list.
Where a disulfiram-like reaction is better established
The same review found the reaction is on firmer ground elsewhere than metronidazole: “Cephalosporins with a methylthiotetrazole (MTT) side chain or a methylthiodioxotriazine (MTDT) ring, ketoconazole, and griseofulvin have an increased risk of a disulfiram-like reaction.”
Two qualifications a UK reader needs. Ketoconazole and griseofulvin are antifungals rather than antibacterials, so they are not what most people mean by “antibiotics”. Griseofulvin’s UK label is nonetheless the bluntest we found on this subject, stating that “consumption of alcohol in association with griseofulvin can result in an ‘Antabuse’ type reaction” and that patients “should be cautioned to avoid alcohol and all alcohol containing products”. And when we searched the electronic Medicines Compendium for the three best known MTT cephalosporins, cefotetan, cefoperazone and cefamandole, none returned a product. That is our own search rather than a statement of what is licensed, but the clearest cephalosporin example appears not to be one handed out in Britain.
Isoniazid, used for tuberculosis, shows the other kind of warning. Its UK label advises “care” when giving it to patients “suffering from convulsive disorders, diabetes mellitus, chronic alcoholism, or impaired liver or kidney function”. That is not two substances reacting. It is two things loading the same organ.
Why drinking while ill is still worth avoiding
Strip out every interaction and a reason for the advice remains, which is why the NHS puts it first: “It’s a good idea to avoid drinking alcohol when taking medicine or feeling unwell.”
The practical version is symptom overlap. Nausea, diarrhoea and dizziness are common antibiotic side effects and ordinary consequences of drinking. Do both, feel awful, and you cannot tell which caused it. The outcome that matters is the one where you decide the antibiotic is disagreeing with you and stop a course you needed. Courses also depend on remembering them, which a heavy night does not help.
There is a separate literature on alcohol and immune function. Szabo and Saha, in 2015, describe even moderate amounts of alcohol influencing immune responses, often as “a subclinical immunosuppression that becomes clinically relevant only after a secondary insult (e.g., bacterial or viral infection or other tissue damage)”. That is a paper about host defence and says nothing about antibiotics. We are not stretching it into a claim that a glass of wine will make your infection last longer, because no source we found supports that.
When the question underneath is about the drinking
Most people arrive here wanting to know about one evening, and the NHS page for the drug in your hand will usually answer that in a sentence.
A smaller group arrives because a week without alcohol turned out to be genuinely hard, which is the more useful thing to have noticed. Struggling to get through a short course sober is a recognised clinical signal rather than a character question. The early signs of alcohol dependence and what a functioning drinker looks like are honest places to start, and what actually helps with cravings is the practical follow-on. If you drink heavily every day, do not stop abruptly on your own, because unmanaged alcohol withdrawal can be dangerous. Speak to a clinician first.
The Orchid Recovery is a residential addiction and mental health treatment centre in Hang Dong District, Chiang Mai, Thailand, for international English speaking adults. If drinking has stopped being something you can put down, our pages on alcohol addiction treatment and medically supervised alcohol detox explain what that involves, our clinical team is listed here, and you can talk to us. Almost everyone reading this came for the antibiotic question and needs none of it.
We have also written about pregabalin and alcohol, where the interaction is genuine and serious rather than a folk rule.
Sources
- NHS, Antibiotics: interactions
- NHS, Antibiotics
- NHS, Common questions about amoxicillin
- NHS, Common questions about phenoxymethylpenicillin
- NHS, Common questions about flucloxacillin
- NHS, Common questions about cefalexin
- NHS, Common questions about ciprofloxacin
- NHS, Common questions about azithromycin
- NHS, Common questions about clarithromycin
- NHS, Common questions about trimethoprim
- NHS, Common questions about nitrofurantoin
- NHS, Common questions about erythromycin
- NHS, Common questions about doxycycline
- NHS, Common questions about metronidazole
- electronic Medicines Compendium, Erythrocin 250 Tablets, Summary of Product Characteristics
- electronic Medicines Compendium, Linezolid 600mg Film-Coated Tablets, Summary of Product Characteristics
- electronic Medicines Compendium, Griseofulvin 500mg Tablets, Summary of Product Characteristics
- electronic Medicines Compendium, Isoniazid 100mg Tablets BP, Summary of Product Characteristics
- Mergenhagen KA, Wattengel BA, Skelly MK, Clark CM, Russo TA, Fact versus Fiction: a Review of the Evidence behind Alcohol and Antibiotic Interactions, Antimicrobial Agents and Chemotherapy 2020
- Williams CS and Woodcock KR, Do ethanol and metronidazole interact to produce a disulfiram-like reaction?, Annals of Pharmacotherapy 2000
- Orire I, Sagoe M, Muzny CA and Kissinger PJ, Revisiting the Disulfiram-Like Reaction Between Alcohol and Oral Metronidazole, Sexually Transmitted Diseases 2026
- Cina SJ, Russell RA and Conradi SE, Sudden death due to metronidazole/ethanol interaction, American Journal of Forensic Medicine and Pathology 1996
- Szabo G and Saha B, Alcohol’s Effect on Host Defense, Alcohol Research: Current Reviews 2015
Before you close this page
If you came here about the antibiotic in your hand, you have the answer and there is nothing further on this page for you.
The line worth keeping is the other one. A course that was hard to get through sober tells you more than any of the pharmacology above does. If that is where you are, residential treatment in Thailand and our alcohol addiction programme set out what a stay with us actually looks like. WhatsApp is usually the quickest way to reach our admissions team, on +66 985 245 093, and the same number takes calls. If you would rather put it in writing, admissions@orchidrecoverythailand.com.
Frequently Asked Questions
Can you drink alcohol on antibiotics?
For most of them, yes. The NHS states that it is unlikely drinking alcohol in moderation will cause problems with the most common antibiotics. It names metronidazole and tinidazole as the two to avoid alcohol with completely, and flags linezolid and doxycycline separately. Check the NHS page for the specific drug you were given, because the answer is drug by drug rather than class-wide.
Which antibiotics can you not drink alcohol with?
The NHS names two for complete avoidance: metronidazole and tinidazole. It advises that it may be best to avoid alcohol with linezolid, which is affected by fermented drinks, and with doxycycline, which it says may be less effective in people with a history of drinking heavily. Everything else on the common NHS antibiotic pages is either a yes or is silent on alcohol.
Does alcohol stop antibiotics from working?
For most antibiotics there is no evidence that it does. A 2020 systematic review found that oral penicillins, fluoroquinolones, azithromycin, tetracycline and nitrofurantoin among others can be used safely with alcohol. It did find that erythromycin may have reduced efficacy with alcohol, and doxycycline may have reduced efficacy in chronic alcoholism. Those are the exceptions, not the pattern.
Why do people believe you cannot drink on any antibiotic?
Because the warning is true for a small number of drugs and got generalised to all of them. The 2020 review opens by noting that many antibiotics carry caution stickers warning against alcohol while data on concurrent use are sparse, and concludes that common beliefs rest on poor and often conflicting data. Several origin stories circulate, and we could not verify any of them at a primary source.
My antibiotic leaflet says nothing about alcohol. Does that mean it is safe?
No, and this is the most common misreading. A label that is silent on alcohol has not cleared it. It has not addressed it. Amoxicillin's UK label does not list alcohol, and the NHS separately says yes. Erythromycin's UK label does not mention alcohol either, yet the NHS page advises limiting it. Silence is a gap, and your pharmacist can fill it.
What happens if you drink on metronidazole?
The NHS describes feeling and being sick, stomach pain, hot flushes, a pounding heartbeat and a headache, and the label calls this a disulfiram-like reaction. Published reviews have questioned for twenty five years whether the reaction happens at all, while one death has been attributed to it. If you have already drunk and feel unwell, contact NHS 111 in the UK or your local equivalent, and use emergency services if symptoms are severe.
I could not get through the course without drinking. Does that mean something?
It is worth looking at honestly. Finding a few days without alcohol genuinely difficult is a recognised clinical signal rather than a character flaw, and a short antibiotic course is often the thing that reveals it. If you drink heavily and daily, do not stop suddenly on your own, because withdrawal can be dangerous without support. Speak to a clinician about how to do it safely.
