After peroral administration, drugs generally are absorbed best from the

• A. Stomach
• B. Jejunum
• C. Ileum
• D. Duodenum

Answer: (D)

Absorption of most orally taken drugs happens in the small intestine because it offers a huge surface area and abundant blood flow. The duodenum, as the first part of the small intestine, is especially favorable: chyme mixes there with bile and pancreatic secretions, helping to dissolve poorly soluble drugs, and the environment around neutral pH plus close contact with the absorptive mucosa facilitates rapid uptake. While other segments contribute to absorption, the duodenum often provides the quickest and most efficient opportunity for drugs to cross into the bloodstream, making it the best site for general oral absorption.