Generic Viagra Sildenafil is the medical or generic name for Viagra. Medically they are the same. Sildenafil is sometimes called generic Viagra. Sildenafil was first marketed under the name Viagra in 1998. In June 2013, when the patent of Viagra expired in the UK and other European countries, prices came down significantly. Generic sildenafil is available at much lower cost, from 95p per tablet
How does sildenafil work? During sexual arousal blood flow in the penis changes. It is this change in blood flow which produces erections. Sildenafil is known medically as a PDE5 inhibitor. PDE5 inhibitors alter the levels of the natural chemical messengers involved in producing erections. Why choose sildenafil? Sildenafil is a tried and tested medicine. Most men find it effective and are not usually troubled by significant side effects. It usually starts to work within 30 minutes of taking a tablet, and usually remains active for about 4 hours. Erections will only occur during this time if there is stimulation. If there is no arousal, there will be no erection. After 4 hours the effects of the tablet wear off.
How to take sildenafil The normal starting dose, in men who have not taken sildenafil before, is one 50mg tablet. Subsequent doses can be adjusted up to a maximum of 100mg as a single dose, or down to 25mg, depending on response. Most men find 50mg sufficient. Sildenafil should not be taken more than once in 24 hours. The effects of treatment may not be exactly the same each time. It is best to take the same dose that worked previously, increasing the dose only if on several occasions treatment is not successful.