7.2 Basics Concepts of the Gastrointestinal System

Prior to discussing specific GI disorders and associated medication classes, it is important to have a clear understanding of the anatomy the gastrointestinal system.

Review of Anatomy of the Gastrointestinal System

It is important to know the basic anatomy and physiology of the gastrointestinal system to understand how gastrointestinal (GI) medications work. See Figure 7.1^[1] for an illustration of the anatomical components of the GI system. There are a variety of medications used to treat common GI disorders, so this chapter’s content is divided into three subsections discussing medications classes treating common disorders: antiulcer, antidiarrheals/laxatives, and antiemetics. Each subsection will further review the GI anatomy and physiology related to these conditions and medications.