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Sildenafil, the active ingredient in both Viagra and generic sildenafil tablets, typically works for up to around 4 hours in many men, with effects generally beginning within 30 to 60 minutes of taking it. It does not cause a continuous erection throughout this period. Instead, it helps support an erection when you are sexually aroused during the time the medicine is active. For some men, sildenafil may remain in the body beyond this main treatment window, although its clinical effect gradually decreases over time.
How long sildenafil lasts can vary from person to person. Factors such as your dose, what you have eaten, alcohol intake, age and overall health may affect your experience. Understanding what to expect can help you use the medicine safely and recognise anything that may be worth discussing with your prescriber.
This guide explains how long sildenafil usually lasts, how quickly it starts working, whether a higher dose lasts longer, how sildenafil compares with Viagra and other ED treatments such as tadalafil, and how factors such as food and alcohol may affect your experience.
Key things to know
- Sildenafil may work for up to around 4 hours in many men, although individual responses vary and the effect gradually decreases over time.
- It usually starts working within 30 to 60 minutes, although this can take longer in some people, particularly after a high fat meal.
- Sildenafil and Viagra contain the same active ingredient, so their expected duration is broadly the same.
- Tadalafil (Cialis) generally has a much longer duration of action and may remain effective for up to around 36 hours.
- Do not take more than one dose of sildenafil in 24 hours unless your prescriber has specifically advised you to do so.
How Long Does Sildenafil Actually Last?
Sildenafil works by blocking the PDE5 enzyme, which helps increase blood flow to the penis when sexual stimulation occurs. Its effects are generally considered to last for up to around 4 hours in many men, although the response varies and the effect gradually becomes weaker as the medicine leaves the body.
You may see "4 to 6 hours" quoted elsewhere online, but the commonly stated treatment window for sildenafil is up to around 4 hours. This does not mean you will have an erection for 4 hours. Sildenafil does not cause an erection on its own. Sexual stimulation is still needed, and the medicine helps make it easier to achieve and maintain an erection during the period it is active.
Onset: How Quickly Does Sildenafil Start Working?
Sildenafil usually starts working within 30 to 60 minutes, although it can take longer for some people. How quickly it takes effect depends partly on how the tablet is absorbed.
Taking sildenafil on an empty stomach may allow it to be absorbed more quickly. A high fat meal can delay absorption by around an hour on average and can reduce the peak concentration of sildenafil in the blood. In practical terms, this may mean that the medicine takes longer to start working rather than meaning that it has stopped working altogether.
Grapefruit juice may also affect sildenafil levels in the body and could increase the risk of side effects. If you regularly drink grapefruit juice, it is worth mentioning this to your pharmacist or prescriber.
Sildenafil 25mg vs 50mg vs 100mg: Does Duration Differ by Dose?
It is easy to assume that a higher dose will last longer, but this is not necessarily the case. Sildenafil is cleared from the body at a similar rate across the usual 25mg, 50mg and 100mg doses.
A higher dose may produce a stronger effect for some people, but it does not necessarily make the medicine work for a longer period. The overall treatment window can still be around 4 hours.
Your prescriber will decide which strength is appropriate for you based on factors such as your response to treatment, side effects, other medicines and your overall health. Do not increase your dose yourself because you want the effect to last longer.
Sildenafil vs Viagra: Is Duration the Same?
Yes. Viagra and generic sildenafil contain the same active ingredient, sildenafil, so their expected onset and duration are broadly the same.
Viagra is the original branded medicine, while generic sildenafil contains the same active ingredient and must meet the relevant UK requirements for quality and bioequivalence. The manufacturer, appearance and price may differ, but the active ingredient is the same.
For this reason, choosing between Viagra and generic sildenafil is generally more about factors such as availability, price and personal preference than how long the medicine lasts.
Comparing Sildenafil Duration to Other ED Treatments
Duration is one of the practical differences between erectile dysfunction treatments. Tadalafil, sold under brand names including Cialis and Cialis Together, has a longer half life than sildenafil and may remain effective for up to around 36 hours. This longer treatment window is why tadalafil is sometimes informally called a "weekend tablet".
Vardenafil has a duration broadly similar to sildenafil, while avanafil (Spedra) may start working more quickly for some people and has a duration broadly comparable with other shorter acting PDE5 inhibitors.
A longer duration is not necessarily better for everyone. It depends on how often you want to plan sexual activity, how much notice you prefer before taking a medicine and how you respond to treatment. If sildenafil's roughly 4 hour window does not suit you, your prescriber can discuss whether another treatment may be more appropriate.
What Affects How Long Sildenafil Lasts
Food and Meals
A heavy or high fat meal can slow down the absorption of sildenafil and reduce its peak concentration in the blood. This may mean that it takes longer to start working. Taking sildenafil on an empty stomach or after a lighter meal may give you a more predictable onset.
Alcohol
Moderate alcohol consumption is not generally considered to cause a clinically significant interaction with sildenafil. However, both alcohol and sildenafil can affect blood pressure, and alcohol itself can make it harder to get or maintain an erection. Drinking large amounts of alcohol may also make it harder to judge how well sildenafil is working.
Rather than focusing on a specific number of units, it is sensible to avoid drinking heavily when taking sildenafil. If you use herbal remedies or supplements, including St John's Wort, tell your prescriber or pharmacist, as some products may affect how medicines work.
Age, Metabolism and Health Conditions
Sildenafil may stay in the body for longer in older adults and in people with reduced liver or kidney function. These factors can affect how quickly the medicine is cleared and may change how long its effects are noticeable.
Your response can also vary depending on your age, health and other medicines you take. This is why a clinical assessment is important before starting sildenafil. If you have liver or kidney problems, your prescriber may recommend a lower starting dose or a different treatment approach.
Safety and Duration: When to Seek Help
An erection that lasts for more than 4 hours, known as priapism, is a medical emergency and needs urgent medical attention. If it is not treated promptly, it can cause permanent damage.
This is different from sildenafil simply remaining active in your body. Sildenafil does not cause a continuous erection. It helps you get and maintain an erection when you are sexually stimulated, and its effect gradually wears off.
Do not take more than one dose of sildenafil in any 24 hour period unless your prescriber has specifically advised you to do so. Taking more sildenafil will not necessarily make its effects last longer and may increase the risk of side effects, including low blood pressure.
Available Treatments
| Treatment | Price from |
|---|---|
| Sildenafil | £3.99 |
| Cialis Together | £16.99 |
| Viagra Connect | £21.99 |
| Spedra | £22.99 |
| Viagra | £27.99 |
| Vardenafil | £27.99 |
| Levitra | £32.99 |
| Tadalafil | £34.99 |
| Cialis | £44.99 |
| Cialis Daily | £89.99 |
Treatment may be available following a successful online consultation and approval by a prescriber .
Prices update live and may change.
Medical Disclaimer
This page provides general information about sildenafil and how long its effects may typically last. It is not a substitute for personalised medical advice, diagnosis or treatment.
If you experience an erection lasting more than 4 hours, seek urgent medical attention, as this can be a medical emergency. If you have questions about sildenafil, your treatment, existing health conditions or other medicines you take, speak to your doctor, pharmacist or prescriber for personalised advice.
Always read the patient information leaflet supplied with your medicine and follow the instructions on your prescription or medicine label. Do not change your dose or treatment schedule based on general information.
