South Korea is not an exception in that one gets spam emails every day, including cheap Viagra. After all, the nation has a huge market for the erectile dysfunction medicine with the market potential of 100 billon won a year that sells 10 million pills that supposedly curses impotence.

In fact, South Korea has an underground market that sells unauthorized medical products that claim to have "Viagra effects," with bigger profit margins, according to Chosun Ilbo.

For example, a liquor contains sildenafil, a main ingredient for Viagra and sells like a hot cake. A Chinese medicine includes the same chemical and sells with a claim that it boosts health middle-aged men."

These items are easily obtainable because they don't require a doctor's prescription. Choosing this easy option can easily turn out to be a trouble for a man, or even kill him.

In 2008, in the space of just five months, some 150 men were hospitalized unconscious, without immediately identifiable causes that might have brought led to the consequence. They all suffered low-sugar level in their blood. Their ages ranged from 51 to 97. Four of them eventually died.

Singaporean authorities launched investigation. They found that these patients all purchased fake and therefore cheap Viagra and Cialis, another impotence drug.

The results were shocking and serious that the results were published in a recent edition of the New England of Medicine.

"There is no guarantee that the Singaporean case won't happen in Korea," the article concluded.