Is mapping borders between pharmacology and toxicology a necessity?

The existent common features between pharmacology and toxicology and the shared basic concepts, in addition the similarities between the principles of the two fields made them both be considered as one scientific subject by many authors. However, the descriptions of toxicology and pharmacology as two distinc tareas have strong arguments as well. Therefore, the qu estionof the existence of borders between pharmacology and toxicology and their nature represent continuous debates e speciallyafter the emergence of new advances and novel concepts in both areas such as those related to the G protein coupled receptor (Ghanemi, 2013b,c) and the factors that can influence this receptor (Ghanemi et al., 2013) along with the new descriptive approaches of drug-target interactions.