If the target for a drug is H. pylori in the stomach, which strategy would lead to higher success?

If the target for a drug is H. pylori in the stomach, which strategy would lead to higher success?

• A. Fast absorption
• B. High plasma concentration in systemic circulation
• C. Rapid transit to intestine
• D. Slow absorption

Answer: (D)

When the target is bacteria living in the stomach, you want the drug to stay where the infection is long enough to exert its effect. Slow absorption keeps the drug in the gastric lumen and near the gastric mucosa longer, increasing both the contact time and local concentration at the site of H. pylori. If the drug is absorbed quickly, it enters the systemic circulation, reducing its residence in the stomach and its exposure to the bacteria. Moving the drug rapidly into the intestine bypasses the stomach altogether, and aiming for high plasma levels doesn’t help a stomach-localized infection. So, prolonging gastric residence by slow absorption maximizes the chance of eradicating H. pylori.

When the target is bacteria living in the stomach, you want the drug to stay where the infection is long enough to exert its effect. Slow absorption keeps the drug in the gastric lumen and near the gastric mucosa longer, increasing both the contact time and local concentration at the site of H. pylori. If the drug is absorbed quickly, it enters the systemic circulation, reducing its residence in the stomach and its exposure to the bacteria. Moving the drug rapidly into the intestine bypasses the stomach altogether, and aiming for high plasma levels doesn’t help a stomach-localized infection. So, prolonging gastric residence by slow absorption maximizes the chance of eradicating H. pylori.