*7.4.4 Clinical phase IV*

After the approval of a drug for commercial consumption, clinical phase IV trials are used as post marketing surveillance trials. This trial system is based upon the various objectives at commercial levels, i.e., the comparison of newly approved and already-available drugs in market, to evaluate the chronic effects on patients' quality of life and to estimate the economical comparison of newly approved and already-present drugs as well as the traditional system of medication [81].

**141**

**Author details**

**Conflict of interest**

, Azhar Rasul1

Authors have no conflict of interest.

, Samreen Gul Khan2

University Faisalabad, Faisalabad, Pakistan

provided the original work is properly cited.

\*Address all correspondence to: drazharrasul@gmail.com

Faisalabad, Faisalabad, Pakistan

University, Nigde, Turkey

\*, Iqra Sarfraz1

the medical practitioners to use the best among the rest drugs discovered.

, Javaria Nawaz1

and Zeliha Selamoglu3

1 Department of Zoology, Faculty of Life Sciences, Government College University

2 Department of Chemistry, Faculty of Physical Sciences, Government College

3 Department of Medical Biology, Faculty of Medicine, Nigde Ömer Halisdemir

© 2020 The Author(s). Licensee IntechOpen. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/ by/3.0), which permits unrestricted use, distribution, and reproduction in any medium,

, Ayesha Sadiqa1

,

Ammara Riaz1

Rabia Zara1

*Chemical Biology Toolsets for Drug Discovery and Target Identification*

Chemical biology is an emerging field of science which particularly focuses on the research in biological systems by employing the chemicals and related chemoinformatic tools. This field of study is working well in combination with medicinal and combinatorial chemistry to seek the cure of incurable and life-threatening human pathologies. This chapter illustrated the significant techniques and chemical setups which can be employed to testify the chemical as well as biological aspects of natural and synthetic compounds before introducing them as therapeutic drugs in the field of medicine. There is an ultimate need of the hour to seek for the newer and better drugs which are safer, cheaper, and more effective than the already existing therapeutics. This field of study is flourishing at a very fast pace, and it is anticipated that it will provide better treatment options and strategies in future for

*DOI: http://dx.doi.org/10.5772/intechopen.91732*

**8. Conclusion and future perspectives**
