Which option best describes transdermal drug delivery systems?

Which option best describes transdermal drug delivery systems?

• A. Systems that deliver drugs across the skin into systemic circulation
• B. Systems that deliver drugs only to the local skin
• C. Systemic injections
• D. Oral pills

Answer: (A)

Transdermal drug delivery systems are designed to move a drug across the skin into the bloodstream, so the drug reaches systemic circulation and can have effects throughout the body. This is different from topical systems that act only on the skin surface for local relief. It’s also not about systemic injections, which introduce the drug directly by needle, or oral pills, which must be absorbed through the gastrointestinal tract.

Transdermal drug delivery systems are designed to move a drug across the skin into the bloodstream, so the drug reaches systemic circulation and can have effects throughout the body. This is different from topical systems that act only on the skin surface for local relief. It’s also not about systemic injections, which introduce the drug directly by needle, or oral pills, which must be absorbed through the gastrointestinal tract.