A PDE5 inhibitor that increases blood flow to the penis, helping you get and keep an erection when you are sexually aroused. Taken when needed, roughly an hour before sex.
You can tell us during your assessment if you'd prefer this treatment. Your prescriber makes the final decision with you.
Start free assessmentFlat prices including the assessment, prescriber review and delivery. Your prescriber confirms the strength and quantity that is appropriate for you.
Sildenafil blocks an enzyme called PDE5, which lets the blood vessels in the penis relax and open. More blood flows in, so an erection becomes easier to get and keep. It does not work on its own - you still need to be sexually aroused, and it does not change libido or desire.
Common effects include headache, facial flushing, indigestion, a blocked or runny nose, dizziness and mild visual changes such as a blue tinge. These usually pass as the dose wears off.
The full list is in the patient information leaflet supplied with your medicine. Report anything unexpected to us or via the MHRA Yellow Card scheme.
Seek urgent medical help if you have an erection lasting longer than four hours, sudden loss of vision or hearing, or chest pain during sex.
Never take sildenafil with nitrates (such as GTN spray) or riociguat - the combination can cause a dangerous drop in blood pressure.
Tell us about heart or liver problems, low blood pressure, a recent stroke or heart attack, or any inherited eye condition. These may mean sildenafil isn't safe for you.
Active ingredient: sildenafil citrate, equivalent to 25mg, 50mg or 100mg sildenafil per tablet.
Excipients vary by manufacturer - the exact list for the pack you receive is in its patient information leaflet. Flagged for verification against the supplied product's SmPC before publication.
Viagra's patent has expired, so other manufacturers now make the same active ingredient. You are paying for the medicine rather than the brand.
Sildenafil is taken as needed, with a maximum of one dose in 24 hours. If you want something suited to more spontaneous use, ask your prescriber about tadalafil.
Sildenafil has been prescribed since 1998 and is well understood. Your prescriber will review your treatment periodically and you can message the clinical team at any point.