Intra-individual variability refers to variability in drug response within what context?

Intra-individual variability refers to variability in drug response within what context?

• A. Differences in response between different individuals.
• B. Differences in response within the same individual over time.
• C. Differences in response between different species.
• D. Differences in response due to measurement error.

Answer: (D)

Intra-individual variability refers to how a drug response can change within the same person over time or under different conditions. This captures real fluctuations in biology within one patient, such as circadian effects on metabolism, the influence of meals, adherence variations, or changes in health status. The option that describes differences in response within the same individual over time fits this concept best. Variability between different people is inter-individual variability, differences between species is inter-species variability, and differences due to measurement error are just artifacts of the measurement process rather than true within-person biological variation.

Intra-individual variability refers to how a drug response can change within the same person over time or under different conditions. This captures real fluctuations in biology within one patient, such as circadian effects on metabolism, the influence of meals, adherence variations, or changes in health status. The option that describes differences in response within the same individual over time fits this concept best. Variability between different people is inter-individual variability, differences between species is inter-species variability, and differences due to measurement error are just artifacts of the measurement process rather than true within-person biological variation.