Original Viagra Sildenafil Citrate Tablet 100mg

Satisfactory erections require the following:

• Adequate blood supply
• Sexual arousal
• Healthy nervous system

If erectile dysfunction is the result of spinal injury or operation, nerves might be damaged. In this case Viagra may help a little but other measures, such as injections or stiffening aids, may be required.

Other causes of erectile dysfunction may require specialist treatment apart from tablets. Some men, whose erectile dysfunction has psychological causes, may benefit from counselling.

Viagra works by increasing blood flow to the penis when sexually stimulated, which helps men get and sustain an erection long enough for sex.

The active ingredient in Viagra is sildenafil, which is known medically as a PDE5 inhibitor. Sildenafil inhibits (blocks) the enzyme PDE5 which regulates blood flow in the penis. PDE5 inhibitors multiply the natural process of arousal and increase blood flow to the penis in situations of sexual stimulation. Sildenafil helps to achieve an erection but relies on natural arousal as a trigger.