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Study shows Cialis preferred over Viagra

...The debut of Zydena, a homegrown drug, in December last year has rekindled competition in the Korean impotence medication market.

Donga Pharmaceuticals Co.'s Zydena created a stir, selling 2 million doses in just one month after its launch.

Pfizer's Viagra, a commercial blockbuster, was introduced in the local market in 1999.

Cialis and Viagra's market share stands at 56.2 percent as of November last year.

Cialis follows with 34.5 percent and (siyoungh@heraldm.com) By Hwang Si-young 2006.02.11 ...