Penicillin G benzathine is used orally and parenterally. Trade names are: Bicillin LA and Permapen.

Penicillin V potassium is characteristically known for being stable in acid (therefore, is taken orally). Trade names are: Ledercillin VK and SK-Penicillin VK.

즉 경구용 페니실린이 VK라는 건데.. 

우리나라 페니실린은 두 개만 유통 되나 봄.. 

http://wiki.answers.com/Q/Difference_between_penicillin_G_and_V