Friday, December 11, 2009

Tadalafil Citrate What Natural Plant/herb Is Viagra Chemically Extracted From?

What natural plant/herb is Viagra chemically extracted from? - tadalafil citrate

How have the combination of sildenafil citrate (Viagra) was found, and what from?
Tadalafil citrate (Cialis) and vardenafil HCl (Levitra), which consists of the same plant source, Viagra is it?

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