It used to be that virtually all doses stand been found either by identifying a active ingredient from either traditional remedies or even by serendipitous discovery.

A recently approach has been to know how else disease and infection are controlled at the molecular and physiology level and to target specific able according to this noesis.

A run of drug discovery involves a identification of candidates, synthesis, characterization, screening, assays, clinical trials, formulation, regulatory requirements and eventually bulk manufacture. (Understand Medicinal chemistry)