Viagra, also known by its generic name Sildenafil, is used to treat erectile dysfunction (ED).
It works by improving blood flow to the penis, helping men achieve and maintain an erection when sexually stimulated.
Sildenafil usually starts working within 30 to 60 minutes and remains effective for around four to five hours.
A common question is how often Viagra can safely be taken and whether there are benefits to daily use.
You can safely use Viagra every day.
Viagra does not cause dependency, and it’s generally safe for most men when used as directed.
Whilst Viagra can lower your blood pressure, the half-life is relatively short, and it is not likely to affect blood pressure for extended periods of time.
However, if you find yourself relying on it every day, it may be worth discussing whether a daily medication such as Tadalafil is better suited to your needs or lifestyle.
For some men, taking Viagra daily may offer both practical and potential health benefits:
While these potential benefits are promising, daily Viagra use is not suitable for everyone.
Always consult your prescriber before taking Sildenafil regularly, especially if you use other medication or have underlying health issues.
If you prefer a treatment designed for regular use, Tadalafil daily is an excellent alternative.
Tadalafil (the active ingredient in Cialis) is available in low daily doses – usually 2.5mg or 5mg – and offers:
It’s ideal for men who are sexually active several times a week or who prefer a steady, predictable effect.
Further reading: Sildenafil vs Tadalafil
No – you should not take more than one dose of Viagra (Sildenafil) within a 24-hour period.
The maximum daily dose is 100mg. You can take two 50mg tablets together (if this equals your prescribed dose), but you should not split doses throughout the day.
Taking multiple doses increases the risk of:
If your current dose isn’t effective, speak to your prescriber rather than increasing it yourself.
Taking more than 100mg of Viagra in a 24-hour period is not recommended and can be harmful.
Higher doses rarely make the medicine more effective. Instead, they increase the risk of side effects such as:
If you accidentally take too much, seek medical help immediately. For symptoms such as chest pain or an erection lasting longer than four hours, call 999 or go to A&E.
Sereno, M. I., Schreiber, J., Marroquin, A. et al., ‘Sildenafil in the elderly: evidence and potential’, Drugs & Ageing, 17 (2000), 243–260, Retrieved 29th October 2025, from: https://pmc.ncbi.nlm.nih.gov/articles/PMC1124975/
McMurray JG, Feldman RA, Auerbach SM, Deriesthal H, Wilson N. (2017). Long-term safety and effectiveness of sildenafil citrate in men with erectile dysfunction. Retrieved 29th October 2025, from: https://pmc.ncbi.nlm.nih.gov/articles/PMC2387281/
‘Common questions about sildenafil’, NHS (website), Retrieved 29th October 2025, from: https://www.nhs.uk/medicines/sildenafil-viagra/common-questions-about-sildenafil/
Whilst all of our content is written and reviewed by healthcare professionals, it is not intended to be substituted for or used as medical advice. If you have any questions or concerns about your health, please speak to your doctor.
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