Which skin function primarily enables topical drug absorption?

Which skin function primarily enables topical drug absorption?

• A. Secretion
• B. Excretion
• C. Absorption
• D. Protection

Answer: (C)

The skin’s ability to take a substance from the surface into its deeper layers and eventually into circulation is what enables topical drug absorption. This isn’t about the skin’s barrier or cleaning functions; it’s about the absorption process itself—the movement of the drug through the skin layers, especially the lipid-rich stratum corneum, into viable tissues and possibly the bloodstream. Secretion and excretion relate to oil production and sweating, which can influence how a drug interacts with the surface but don’t drive entry. Protection, while crucial as a barrier, works to prevent entry rather than facilitate it. So the function that primarily enables topical drug absorption is absorption.

The skin’s ability to take a substance from the surface into its deeper layers and eventually into circulation is what enables topical drug absorption. This isn’t about the skin’s barrier or cleaning functions; it’s about the absorption process itself—the movement of the drug through the skin layers, especially the lipid-rich stratum corneum, into viable tissues and possibly the bloodstream. Secretion and excretion relate to oil production and sweating, which can influence how a drug interacts with the surface but don’t drive entry. Protection, while crucial as a barrier, works to prevent entry rather than facilitate it. So the function that primarily enables topical drug absorption is absorption.