Which percentage range is given for enzyme inhibition/transporters?

Which percentage range is given for enzyme inhibition/transporters?

• A. 10-20%
• B. 0-5%
• C. 70-90%
• D. 38-68%

Answer: (D)

Understanding how much an enzyme or transporter is inhibited helps gauge the likelihood of a clinically meaningful drug interaction. A mid-to-high inhibition range, roughly 38–68%, represents moderate to strong inhibition. This level is where changes in drug exposure become plausible in patients, so it’s the range that’s commonly used to flag potential interactions and justify in vivo confirmation or dose adjustments. Smaller ranges like 0–5% or 10–20% suggest minimal impact and are unlikely to drive clinically important effects, while very high inhibition (70–90%) denotes strong inhibition but is not the standard threshold across all guidelines. Hence, 38–68% best fits the category used to indicate meaningful enzyme/ transporter inhibition.

Understanding how much an enzyme or transporter is inhibited helps gauge the likelihood of a clinically meaningful drug interaction. A mid-to-high inhibition range, roughly 38–68%, represents moderate to strong inhibition. This level is where changes in drug exposure become plausible in patients, so it’s the range that’s commonly used to flag potential interactions and justify in vivo confirmation or dose adjustments. Smaller ranges like 0–5% or 10–20% suggest minimal impact and are unlikely to drive clinically important effects, while very high inhibition (70–90%) denotes strong inhibition but is not the standard threshold across all guidelines. Hence, 38–68% best fits the category used to indicate meaningful enzyme/ transporter inhibition.