This book gives idea about the drug based mixed ligands complexes containing Fe(III) and Mn(III) metals. The book also represents the comparison of biological activities of ligands with their mixed ligands complexes. Synthesis of pyrazolone based ligands are carried out and analyzed by spectroscopic techniques while on other hand the quinolone based drugs are taken as ligands in their free form. Characterizations of the final complexes are carried out by IR spectroscopy, Functional group analysis and Thermo Gravimetric Analysis (TGA). These complexes are also checked for their antimicrobial, antifungal and antituberculosis activities. This book will help research students to carry out studies of drug based mixed ligands complexes of Mn(III) and Fe(III) metals.