How should I take this medicine?

Viagra should be taken one hour before sex on an empty stomach. If you take this medicine with food, it may take a little longer to work.

How long will the effects of this medicine last?

Viagra can remain effective for up to 4 hours

What is the active ingredient in Viagra?

The active ingredient in Viagra is Sildenafil.

What is ‘Generic Viagra’?

Sildenafil is available as a generic drug through this website and works in exactly the same way as the brand, Viagra, but offers a cheaper alternative. Click here for more information on branded and generic medicines.

I am taking medicine for erectile dysfunction the first time and I am unsure which should choose - Viagra, Cialis or Levitra?

If you are unsure which medicine to choose, we suggest you choose Viagra (brand) or Sildenafil (generic). This is because in the unlikely event of you experiencing any side effects, the side effects experienced with Viagra or Sildenafil will last for less time because it remains effective for the shortest time in comparison with Cialis and Levitra.

The most common side effect is headache. Less commonly you may also experience flushing, indigestion, nasal congestion, dizziness, nausea, hot flushes and visual disturbances. These common side effects do not usually last more than 3-4 hours after taking the medicine.

If after taking this medicine you experience an erection lasting for more than 4 hours you should seek medical advice from a doctor urgently.

Please click here to view a patient information leaflet on Viagra.

An alternative to Sildenafil or Viagra is Cialis or Levitra. If you are unsure which is best for you email us at freeadvice@myonlinedoctors.co.uk for more information.