Final answer:
Medications placed on the skin are absorbed slowly after administration, making it the route that causes slow medication absorption. Topical medications are often used for localized treatment and provide a slower, more controlled release compared to sublingual or inhalational routes.
Step-by-step explanation:
The route that causes medication to be absorbed slowly after administration is medications placed on the skin. When medications are applied topically to the skin, they are absorbed more slowly as compared to other routes like sublingual (under the tongue) or via the respiratory airways. Topical medications, such as those for treating superficial skin infections, are designed to act locally rather than systemically. This slow absorption is advantageous for treating localized conditions without significant systemic drug levels that could lead to toxicity.