**Author details**

Shagufta Perveen\* and Areej Mohammad Al-Taweel Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia

\*Address all correspondence to: shagufta792000@yahoo.com

© 2019 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, provided the original work is properly cited.
