Final answer:
The dosage form that dries as a flexible film on the skin is a transdermal patch.
Step-by-step explanation:
The dosage form that dries as a flexible film on the skin is known as a transdermal patch. Transdermal patches are medicated patches containing active ingredients that are absorbed through the skin and into the bloodstream. These patches are often used to deliver medications, such as nicotine or hormones, and provide a slow and controlled release of the drug over time.