Quick answer
Vardenafil is a PDE5 inhibitor for erectile dysfunction (ED). It usually starts working in 25 to 60 minutes, lasts about four to five hours, and needs sexual stimulation to work. A high-fat meal can delay it, and it must never be combined with nitrate medicines. Dose and safety checks should come from a doctor or pharmacist.

What is vardenafil?

Vardenafil belongs to the same family of medicines as sildenafil, tadalafil and avanafil. During arousal the body releases nitric oxide, which raises a messenger molecule called cGMP in the penile arteries. cGMP relaxes the muscle in the vessel walls so more blood can flow in. The enzyme PDE5 breaks cGMP down, and vardenafil blocks that enzyme so the signal lasts longer.

It is sold as a standard tablet and, in some countries, as a tablet that dissolves on the tongue. It does not cause an erection without arousal, does not raise sex drive and does not protect against sexually transmitted infections. If you want to see how it differs from the others, read our plain-language comparison of the four ED tablets.

How long does vardenafil take to work?

Many men notice an effect within about 25 to 60 minutes, and product information usually advises taking a tablet around an hour before sex. The effect typically lasts four to five hours and fades gradually. The half-life of the drug is also about four to five hours.

If nothing seems to happen at first, that does not always mean the tablet failed. Stress, tiredness and worry can all blunt the response. Our article on erectile dysfunction vs performance anxiety explains how to tell the two apart. For a similar timing discussion, see how long sildenafil takes to work.

What can change the timing

• Heavy or fatty meals can reduce and delay the peak effect. A light meal or an empty stomach is more predictable.
• Alcohol in large amounts can blunt erections and add to dizziness. See how smoking and alcohol affect erectile dysfunction.
• Grapefruit juice can raise levels of some ED medicines and increase side effects.
• Other medicines, particularly some antifungals, antibiotics and HIV drugs, can raise vardenafil levels sharply.
• Age and liver health change how fast the body clears the drug, which is why doctors often start men over 65 or with liver problems at a lower dose.

Dose and how it is taken

A typical starting dose in product information is 10 mg, which a doctor may lower to 5 mg or raise to 20 mg depending on response and tolerance. Lower starting doses are common for men over 65, for those with moderate liver impairment and for those on interacting medicines. Taking more than the labelled amount does not make it work better and raises the chance of side effects.

Orally dissolving tablets are placed on the tongue and should not be taken with liquid, so check which form you have. Do not swap forms or products without advice, because different versions are not always interchangeable at the same milligram strength.

Side effects

Get urgent help if you have: an erection lasting longer than four hours, sudden vision or hearing loss, chest pain, fainting or a racing or irregular heartbeat.

Who needs extra caution

Vardenafil has a few points that differ from other ED tablets. It can affect the heart’s electrical rhythm (the QT interval) in some people, so it is generally avoided in men with certain inherited rhythm problems and with some heart rhythm medicines such as quinidine, procainamide, amiodarone and sotalol. Some HIV and antifungal medicines raise vardenafil levels so much that combination is not allowed or needs a much lower dose.

• Nitrates are contraindicated. The combination can cause a dangerous fall in blood pressure. Read our guide to ED pills and nitrates.
• Riociguat should not be combined with it.
• Alpha-blockers and other blood pressure medicines can add to dizziness and need medical advice.
• Heart disease, a recent stroke or heart attack, low blood pressure, severe liver or kidney problems and some eye diseases need a doctor’s assessment first.
• Do not combine with another ED tablet.

Blood pressure and heart health are closely linked to erections, as explained in how blood pressure affects erections. If you are unsure whether a medicine is safe for you, read when to see a doctor for erectile dysfunction.

How it compares with other ED tablets

Vardenafil is close to sildenafil in onset and duration, and many men find the two interchangeable in practice. Tadalafil lasts far longer and has a daily option, as described in daily vs on-demand tadalafil. Avanafil is reported to start sooner and be less affected by food. The right choice depends on your health, your other medicines and how you want treatment to fit your life. You can read product labels in our vardenafil category.

Tips for safer, more predictable use

1. Follow the label and the advice from your doctor or pharmacist.
2. Choose a lighter meal on the day you plan to use it.
3. Keep alcohol modest.
4. Give yourself time and a relaxed setting; pressure makes erections harder.
5. Do not take a second tablet if the first seems slow.
6. Keep a medicine list on your phone and share it with every prescriber.
7. Store tablets as described in our guide to storing medicines safely at home.
8. Support the basics with sleep, activity and a balanced diet. See lifestyle changes to improve erectile dysfunction and sleep, erections and testosterone.

Frequently asked questions

Can I take vardenafil with food?
Yes, but a high-fat meal can delay and reduce its effect. Lighter meals work more predictably.

Does it work without arousal?
No. It supports the body’s normal response to stimulation.

How often can I take it?
No more than once in 24 hours unless a doctor tells you otherwise.

Is it safe with heart medicines?
Not always. Nitrates are never combined with it, and some heart rhythm medicines are also a problem. Ask a doctor first.

Conclusion

Vardenafil is an effective, well-studied ED tablet that works in under an hour for many men and lasts around four to five hours. It needs arousal, can be slowed by fatty meals, and carries specific cautions around nitrates, heart rhythm medicines and some antivirals and antifungals. A short conversation with a doctor or pharmacist is the safest way to confirm dose and suitability. Read our drug policy and FAQs to see how we handle medicine information.

References: U.S. FDA prescribing information for Levitra and Staxyn (vardenafil); NHS medicine information for vardenafil.
This article is general education, not individual medical advice. It is not a substitute for a consultation with a licensed healthcare professional.