Which of the following is NOT a common route of drug administration?

The option indicating "Ultrasonic" is not a common route of drug administration because this method is not typically classified alongside standard routes such as intravenous, subcutaneous, and topical.

Intravenous administration involves delivering medication directly into the bloodstream through a vein, allowing for rapid effects, while subcutaneous administration involves injecting medication into the tissue layer between the skin and muscle, which provides a slower absorption rate but is still widely practiced. Topical administration involves applying drugs directly to the skin or mucous membranes for localized effects, which is a very common practice in medicine.

In contrast, ultrasonic administration isn't a recognized or commonly utilized route for medication. It may refer to the use of ultrasound technology in certain therapeutic contexts or in drug delivery systems that enhance absorption, but it does not represent a standard method for administering medication as the other routes do. Therefore, identifying "Ultrasonic" as the incorrect answer highlights its distinction from widely accepted routes used in clinical practice.