Side effects arise because drugs distribute to non-target tissues during transit from administration to action.

Side effects arise because drugs distribute to non-target tissues during transit from administration to action.

• A. They Only Distribute to Target Tissues
• B. They Can't Distribute to Other Tissues
• C. They Distribute to Other Tissues Unintentionally
• D. They Are Immediately Excreted

Answer: (C)

Side effects come from the drug spreading beyond the intended site as it moves through the body. During the distribution phase, the drug travels in the blood and into various tissues; not all of these tissues are the target. This unintended distribution means other organs or tissues can be exposed to the drug’s effects, leading to adverse effects. That makes the best description: the drug distributes to other tissues unintentionally. The idea that a drug only goes to target tissues isn’t accurate, and saying it can’t reach other tissues conflicts with how distribution works. Excretion is a separate step and doesn’t explain side effects during distribution.

Side effects come from the drug spreading beyond the intended site as it moves through the body. During the distribution phase, the drug travels in the blood and into various tissues; not all of these tissues are the target. This unintended distribution means other organs or tissues can be exposed to the drug’s effects, leading to adverse effects.

That makes the best description: the drug distributes to other tissues unintentionally. The idea that a drug only goes to target tissues isn’t accurate, and saying it can’t reach other tissues conflicts with how distribution works. Excretion is a separate step and doesn’t explain side effects during distribution.