Short answer: Tadalafil and alcohol interact mainly through blood pressure. Drinking alcohol while taking tadalafil can increase the risk of low blood pressure, dizziness or light-headedness, according to the NHS. The EU Cialis leaflet advises avoiding excessive drinking and says it may increase dizziness when standing. Neither source sets a safe number of drinks. Alcohol can also make getting an erection more difficult. The aim is not to turn a leaflet into a drinks calculator.
What does the tadalafil and alcohol warning mean?
The main concern is a drop in blood pressure. The NHS says alcohol taken with tadalafil can increase the risk of low blood pressure, which may make you feel dizzy or light-headed. The EU patient leaflet for Cialis says alcohol may temporarily lower blood pressure and warns that excessive drinking may increase dizziness when standing up. “Orthostatic” or “postural” hypotension is the medical term for a blood-pressure drop associated with standing.
However, that warning describes a possible effect, not a prediction that everyone will become dizzy. The sources do not set a universal safe amount. For wider information on the active substance, see our tadalafil guide.
What the official sources say—and what they do not
The NHS gives concise public advice; the EU Cialis information also describes an alcohol interaction study.
| Source | What it says | Evidence boundary |
|---|---|---|
| NHS tadalafil guidance | Alcohol with tadalafil can increase the risk of low blood pressure, dizziness or light-headedness. Too much alcohol can make getting an erection more difficult. | It gives no drink count, blood-alcohol cut-off or waiting period. “Too much” is not quantified. |
| EU Cialis patient leaflet, section 3 | The leaflet says alcohol may affect erections and temporarily lower blood pressure. It advises avoiding excessive drinking, identifying a blood-alcohol level of 0.08% or greater as a level that may increase dizziness when standing. | This is wording in the EU information for Cialis. The figure is not a recommended limit, a safe-drinking threshold or a conversion to a number of drinks. |
| EU Cialis SmPC, section 4.5 | In the described study, 20 mg tadalafil did not increase the mean blood-pressure decrease with 0.7 g/kg alcohol, but some subjects had postural dizziness and orthostatic hypotension. With 0.6 g/kg, hypotension was not observed and dizziness occurred at a similar frequency to alcohol alone. | The SmPC also says the alcohol was administered after an overnight fast, with no food until two hours later. These study doses and conditions are not a real-world drinking guide or proof of a safe amount. |
The study’s average result and the leaflet warning are not contradictory. In other words, a mean blood-pressure result does not rule out symptoms in some individuals. The SmPC reports single-dose interaction data for tadalafil 10 mg or 20 mg; that is narrower than every dose, person, drinking pattern and circumstance.
Do the numbers tell you how much you can drink?
No. First, the 0.08% figure in the patient leaflet is expressed as a blood-alcohol level, not as a number of glasses. The study’s 0.6 g/kg and 0.7 g/kg figures describe experimental alcohol doses; they are not instructions to reproduce the study. Do not convert either measure into units, drinks or permission to drink. Neither source says that staying below a particular number removes the risk.
Second, the same applies to timing. The cited sources do not set a countdown for when it is safe to drink after a tadalafil tablet, or a wait time before taking tadalafil after alcohol. This article cannot supply one. A fixed interval would go beyond the tadalafil and alcohol evidence reviewed here.
Does daily tadalafil have different alcohol advice?
The verified EU interaction-study passage reports alcohol data for 10 mg and 20 mg tadalafil; it does not report equivalent alcohol testing for the 2.5 mg or 5 mg daily regimens. The daily-use patient leaflet still says that drinking alcohol may affect the ability to get an erection. This evidence gap does not show that daily tadalafil is safer or riskier with alcohol, and it does not establish a separate drinking limit for daily use.
In short, the tadalafil and alcohol evidence covers on-demand doses, not daily ones.
Therefore, do not use that gap as a reason to change, skip or add a dose. Follow the directions for your prescribed medicine, and ask a pharmacist or prescriber about your own regimen. Our sildenafil and tadalafil comparison covers the broader differences between those active substances; it does not replace advice about your medicines.
A practical check before making a decision
So if you are unsure, use the exact patient leaflet supplied with your medicine and ask a pharmacist or prescriber rather than guessing at a drink count.
- Check which product you have. The EMA document cited here is the EU product information for Cialis. It does not independently establish the composition, authenticity or authorisation of every product labelled as tadalafil. In addition, for general verification steps, see our guide to checking a suspected erectile-dysfunction medicine.
- Notice symptoms. The NHS says dizziness can happen with tadalafil and advises waiting until it stops. Alcohol may increase the risk of low blood pressure and light-headedness, so do not treat feeling unwell as a cue to experiment with more alcohol or a different dose.
- Mention your other medicines. The NHS advises checking with a doctor or pharmacist about other medicines, herbal remedies, vitamins and supplements. This matters particularly if you use medicines that affect blood pressure.
- Treat nitrates as a separate serious interaction. The EU Cialis SmPC says tadalafil can augment the blood-pressure-lowering effects of organic nitrates and contraindicates taking them together. The NHS also says to ask a doctor or pharmacist if you take nitrates such as glyceryl trinitrate (GTN) for chest pain. If chest pain occurs while taking Cialis, the leaflet says to seek immediate medical assistance and not to use nitrates.
Above all, these are information checks, not personalised clearance to drink. If tadalafil is causing symptoms or your medicine instructions are unclear, speak to a healthcare professional.
Tadalafil and alcohol: frequently asked questions
The NHS says drinking alcohol with tadalafil can increase the risk of low blood pressure, dizziness or light-headedness. The EU Cialis leaflet advises avoiding excessive drinking. Neither source sets a safe number of drinks or says that the same amount is suitable for everyone.
The NHS and EU Cialis product information do not give a safe drink count. However, the blood-alcohol and grams-per-kilogram figures in the EU leaflet and study are not a way to calculate one. Ask a pharmacist or prescriber for advice that considers your medicine and health circumstances.
The NHS says too much alcohol can make getting an erection more difficult. As a result, that does not establish why a particular dose did or did not help, and it is not a reason to take an extra dose or alter a prescribed schedule. If you have ongoing concerns, speak to the prescriber.
The cited interaction-study passage reports 10 mg and 20 mg data, not equivalent testing with 2.5 mg or 5 mg daily use. The difference in study coverage is not proof of a different alcohol risk or a separate safe limit. Follow the leaflet for your exact medicine and ask a healthcare professional if unsure.
Further reading
- Tadalafil: effects, duration, risks and comparisons — the cornerstone substance overview, including dosing regimens and interaction summaries.
- Sildenafil vs tadalafil: differences explained — sourced comparison of onset, duration, food effect and prescription status.
- Fake erectile dysfunction drugs: what you can verify and how to proceed — how to check a medicine’s registration status in your country’s authority register.
- How we create and update content — our editorial methodology, evidence hierarchy and author transparency statement.
Sources
- European Medicines Agency. Cialis EPAR — Product Information (SmPC and package leaflets). ema.europa.eu (accessed 2026-09-28).
- NHS. Tadalafil. nhs.uk (accessed 2026-09-28; page last reviewed 13 May 2026).
This is an editorial comparison of source documents, not a personal-use account or a clinical review. The EU product evidence cited above is the European Cialis SmPC and patient leaflet published through the EMA. The NHS page provides UK public guidance on tadalafil. Neither source defines a safe drink count, and the experimental alcohol doses have deliberately not been translated into drinking advice.
The source text was checked on 28 September 2026. The cited Cialis information is product-specific; check the leaflet supplied with your own medicine. For how KamaShop selects and updates evidence, read how we create and update health content. Author: Testovic (editorial author). No independent doctor or pharmacist reviewer has been documented for this article. This guide is informational: it does not diagnose, set a dose, or replace a doctor or pharmacist. For a personal health question, speak to a qualified professional.
Further informational articles can be found on the blog.
