Known as sildenafil citrate, tadalafil, and vardenafil in the medical community, the male enhancement prescriptions Viagra, Zenegra, Cialis, and Levitra have become silent household names. Men and women alike are feeling the impact of a sexual revolution. Couples can now carry on a sexually active lifestyle well into their golden years. It may no longer be your parents in the bedroom, but your grandparents.

Erectile dysfunction is one of the most common sexual dysfunction in men. Statistics show that as many as 10 percent of men have recurring problems and that almost all men experience erectile dysfunction at some point or another in their lives. Sex therapists define erectile dysfunction as the inability to develop or maintain the erect state of the penis in order to engage in satisfactory sexual intercourse.

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According to the results of a new study by researchers at Johns Hopkins, Viagra, a drug used to treat erectile dysfunction (ED) in millions of men, reduces the stimulatory effects of hormonal stress on the heart by half.

The drug sildenafil, (Viagra), which is more widely known for helping genital blood vessels expand to maintain an erection and, recently, as a treatment for pulmonary hypertension, has previously been thought to have little direct effect on the human heart.

According to the study's senior author and cardiologist David Kass, M.D., a professor at The Johns Hopkins University School of Medicine and its Heart Institute, sildenafil blunts the strengthened heart beat caused by chemically induced stress, thereby lessening the excess amount of blood and force used to pump it to the body.

Sildenafil citrate (Viagra), a drug used to treat erectile dysfunction (ED) in millions of men, reduces the stimulatory effects of hormonal stress on the heart by half, according to results of a new study by researchers at Johns Hopkins.

While sildenafil is more widely known for helping genital blood vessels expand to maintain an erection and, more recently, as a treatment for pulmonary hypertension, it has been thought to have little direct effect on the human heart.

The revelation that athletes are using the drug Viagra to enhance their sporting prowess has prompted the World Anti-Doping Agency (WADA), which monitors the use of drugs in sport, to consider adding Viagra to its list of illegal substances.

Viagra (Sildenafil) is intended to alleviate erectile dysfunction but from a scientific standpoint, whether it also enhances athletic performance is unclear.

WADA is currently conducting research into the drug but results are not expected until next year - the drug is currently not an illegal substance in world sport.

That Viagra has the nickname 'Vitamin V' in sporting circles is an indication of its popularity and experts say Viagra and a similar drug, Cialis are regularly found in the urine samples of male competitors.

Research by UK, Swedish and American researchers shows that taking internet drugs can kill and bypassing health systems can leave life-threatening problems undiagnosed. It's estimated that 90% of counterfeit drugs are sold on the internet, 44% of internet Viagra is fake, the global sale of counterfeit drugs will reach $75 billion this year and EU seizures have risen dramatically. Counterfeit drug deaths include men who took fake erectile dysfunction drugs, pregnant women injected with fake iron for anaemia and children who took paracetamol syrup contaminated with antifreeze.

Men who buy fake internet drugs for erection problems can face significant risks from potentially hazardous contents and bypassing healthcare systems could leave associated problems like diabetes and high blood pressure undiagnosed. That's the warning just published online by IJCP, the International Journal of Clinical Practice.

The revelation that athletes are using the drug Viagra to enhance their sporting prowess has prompted the World Anti-Doping Agency (WADA), which monitors the use of drugs in sport, to consider adding Viagra to its list of illegal substances.

Microsoft has targeted and shut down numerous fake-Viagra pedalling websites.

The sites had been spamming internet users with messages encouraging them to buy Viagra. Those who were tricked into doing so found that the tablets they received were fake versions of the impotence treatment.

The popularity of Erectile Dysfunction meds has skyrocketed over the past 15 years. Since the success of the highly marketed and highly profitable Viagra, other pharmaceutical companies have hopped on board with their own impotence drugs.

But it’s not only these large, legitimate companies producing meds for erectile dysfunction – there is an “underground” of pill producers making counterfeit pills which are colored, pressed, and packaged to look like real Viagra or other ED drugs.

After being detected in coffee mixtures and sweets, Viagra has now been found in fruit juices.

After raiding more than 30 retailers and distributors dealing in the fruit juice, enforcement officers from the Health Ministry in Malaysia seized several hundred thousand ringgit worth of the product.

Due to a risky ingredient, the FDA has ordered a recall of certain lots of Xiadafil VIP Tabs, an illegally marketed "all-natural" dietary supplement touted for sexual enhancement and erectile dysfunction (ED) treatment.

FDA lab tests show that the recalled supplements contain hydroxyhomosildenafil, which is similar to sildenafil, Viagra's active ingredient.

The anti-impotence drug Viagra actually reduces men's fertility by decreasing the ability of their sperm to fertilize an egg, according to a study conducted by researchers at Queen's University Belfast and published in the journal Fertility and Sterility.

Researchers carried out two different experiments to determine what effect the popular drug might have on sperm cells. In the first study, human sperm samples were bathed in weak Viagra solutions, intended to approximate the blood concentration acquired from taking a single 100-milligram Viagra pill. They found that while the Viagra-bathed sperm became more active, they also suffered damage to the structure at their heads known as the acrosome. This portion of the cell contains enzymes that help break down the membrane around an egg so that the sperm can penetrate it.

Cialis(tadalafil) has steadily increased its market share and gained against Viagra (sildenafil citrate) in the nine months since it was introduced in the U.S. to treat erectile dysfunction (ED). Recent surveys reinforce that the main reason for this growth is because Cialis works for up to 36 hours, allowing a man and his partner time to relax, not worry about planning and be intimate when they want to be.2

For the week ended August 6, weekly new prescription data show Cialis has 20.1 percent of new oral ED treatment prescriptions in the U.S., compared to 14.1 percent for Levitra(vardenafil HCl) and 65.8 percent for Viagra.3 In total oral ED prescriptions, Cialis has 15.7 percent in the U.S., compared to 11.3 percent for Levitra and 73 percent for Viagra. Cialis has increased its share of total prescriptions every month since its introduction in the U.S.4