A physical requirement for the use of proton pump inhibitors is the presence of at least how many centimeters of jejunum to ensure absorption?

• A. 25 cm
• B. 50 cm
• C. 75 cm
• D. 100 cm

Answer: (B)

Proton pump inhibitors must be absorbed in the small intestine, with the proximal jejunum providing the main site for uptake after oral dosing. Because the surface area and transit in this region drive how much of the drug enters the circulation, there is a practical minimum length of absorptive jejunum needed to achieve reliable absorption. About 50 cm of jejunum provides enough surface area and time for typical PPI absorption; shorter lengths can lead to markedly reduced bioavailability, while extra length beyond this minimum doesn’t change the requirement for basic absorption. Therefore, 50 cm is the appropriate minimal length to ensure adequate absorption.