One of the most common questions about sildenafil is how long it lasts. Understanding the expected timing can help you use the medicine responsibly and avoid taking another dose too soon.
How long does sildenafil last?
Sildenafil is generally used before sexual activity. The NHS says people with erection problems are usually told to take one tablet around 1 hour before sex, and the effects can last for several hours. The exact response varies between individuals.
It is important to understand that this does not mean you will have an erection continuously. Sildenafil supports the body’s natural erectile response when sexual stimulation occurs.
When does sildenafil start working?
Many people notice an effect within about 30 to 60 minutes, although timing can vary. Food can affect absorption, particularly a heavy or fatty meal, so follow the instructions that came with your medicine.
Our Sildenafil Information page provides additional information about the medicine and its safe use.
What can affect how long sildenafil works?
- Your individual response to the medicine.
- When and how you take the dose.
- Food and alcohol.
- Other medicines you take.
- Underlying health conditions.
- Stress, anxiety and tiredness.
Because these factors can vary considerably, you should not assume that a particular duration will apply to everyone.
Can you take sildenafil more than once a day?
The NHS advises that you should not take more than one sildenafil dose in a day. Never take an additional tablet simply because you think the first dose has worn off.
If you are uncertain about your dose, read our Medication Safety information and speak with a doctor or pharmacist.
Sildenafil and sexual stimulation
Sildenafil is not an aphrodisiac and does not automatically produce an erection. Sexual stimulation remains necessary. This is one reason why a person’s experience can differ from what they expected after taking a tablet.
Safety and medicines that can interact
Sildenafil can interact with nitrate medicines used for chest pain and may not be suitable with certain other medicines or health conditions. The NHS recommends checking with a doctor or pharmacist if you are unsure whether it is safe for you.
Read the NHS sildenafil information for current official guidance.
What if sildenafil seems to stop working?
If sildenafil no longer seems effective, do not increase the dose yourself. ED can change over time, and factors such as cardiovascular health, diabetes, stress, medicines and lifestyle can influence erections.
If erection difficulties happen regularly, consider speaking with a GP. You can also read our Erectile Dysfunction guide for an overview of possible causes and treatment approaches.
Summary
Sildenafil is normally taken before sexual activity and can remain effective for several hours, but the duration varies. Use only as directed, do not exceed the recommended frequency, and ask a healthcare professional if you have concerns about effectiveness or safety.
FAQs
How quickly does sildenafil work?
It often begins to work within about 30 to 60 minutes, but individual response varies.
How long can sildenafil remain effective?
The effects can last for several hours. This does not mean an erection lasts continuously.
Can I take another tablet the same day?
The NHS advises not to take more than one sildenafil dose in a day.