Men of all ages may experience their worst fear: just as they are about to engage in sexual intercourse with their partner, they fail to “perform.” If this is the case, you may be suffering from a very common medical condition called erectile dysfunction. It can affect men of all ages, and it makes it very difficult, if not impossible, to achieve or sustain an erection during lovemaking. Fortunately, that is no longer a problem, thanks to Pfizer’s creation of a drug called Viagra. This small blue pill is taken orally approximately 30 minutes to one hour before engaging in sexual intercourse. It is available in 25mg, 50mg and 100mg doses and can work as quickly as 15 to 30 minutes after taking it. However, the drug only works in combination with sexual stimulation. It is also important to talk to your doctor if you are currently taking other medications, are older than 65 or have severe kidney or liver diseases. All of these factors can affect how Viagra works. As long as you follow the prescribed dosage and don’t take the pill right after eating a high-fat meal, you may be pleasantly surprised at how well Viagra can work.