Intestinal bioavailability with obesity is affected how?

• A. Solubilization and absorption increase
• B. Solubilization and absorption decrease
• C. No effect on solubilization and absorption
• D. Solubilization decreases while absorption increases

Answer: (B)

Obesity changes how the gut handles drugs, especially those that don’t dissolve easily. The amount of drug that enters the bloodstream after oral dosing depends on solubility in intestinal fluids and on the drug’s ability to cross the intestinal lining. In obesity, the bile acid pool and micelle formation can be altered, which lowers solubilization of poorly soluble drugs. If the drug isn’t dissolved well, only a smaller fraction is available for absorption, so the overall amount that gets into the bloodstream drops. At the same time, obesity-related changes in intestinal blood flow, motility, and mucosal transport can further reduce how much is actually absorbed. Put together, both solubilization and absorption tend to decrease, explaining why intestinal bioavailability is reduced in obesity.