Scopolamine patch can be applied to the following skin sites: select the classification of these sites.

• A. All of the choices are correct.
• B. Three of the choices are correct.
• C. Two of the choices are correct.
• D. One of the choices is correct.

Answer: (D)

Transdermal scopolamine works best when placed on a clean, dry, hairless area with minimal movement, so the drug can be absorbed steadily for several days. Behind the ear fits these needs well: the skin is relatively thin, there’s usually little hair, and adhesion tends to be reliable, giving a predictable delivery over about 72 hours. Other skin sites often have more hair, skin folds, irritation, or more movement, which can affect how well the patch sticks and how the medication is absorbed. Because only one of the listed sites meets these requirements, the correct classification is that only one site is appropriate. The standard, recommended site is behind the ear.