BDDCS drugs count in the original Benet’s collection (plain
color) and in the Hosey’s collection (transparent color). Class 1, 2, 3
and 4 are respectively depicted in black, red, blue and green. The 4 BDDCS
classes are as follows: Class 1, high-solubility/high-metabolism; Class 2,
low-solubility/high-metabolism; Class 3, high-solubility/low-metabolism; and
Class 4, low-solubility/low-metabolism, respectively.