GI198745 is a oral drug made by Glaxo Welcome. Dutasteride works
in a similar way to Propecia by inhibiting the 5 Alpha Reductase
enzyme that converts testostereone to DHT. Unlike Propecia however,
Dutasteride inhibits both Type 1 and Type 2 of the enzyme, it
also inhibits more Type 2 than Propecia does. What this means
is that this will be a lot more effective than Propecia since
almost complete DHT inhibition is achieved.
here to learn more about this drug