Pioglitazone. Molecular model of the drug pioglitazone (C19.H20.N2.O3.S), used for the treatment of diabetes mellitus type 2. It is a thiazolidinedione drug that lowers blood sugar levels (hypoglycemic action). Atoms are represented as spheres and are colour-coded: carbon (grey), hydrogen (white), nitrogen (blue), oxygen (red) and sulphur (yellow).