Why are pneumatic tube systems not allowed for transporting certain medications?

The correct choice highlights a significant concern regarding the use of pneumatic tube systems for transporting medications. While these systems provide efficiency in moving packages quickly across various hospital locations, they are not suitable for all types of medications due to the risk of spills.

In a pneumatic tube system, medications are subjected to changes in pressure and speed as they travel through the tubes. This can create conditions that lead to the rupture of vials or the compromise of fragile containers, especially for certain liquid formulations. If a medication is spilled, not only does it result in a loss of the drug, but it can also pose safety risks to personnel and patients, as well as contamination of the transport area.

In contrast, while the potential for damage to medications, costs, and the size constraints of pneumatic tube systems may be relevant factors in determining their suitability, these issues do not directly address the immediate risk of spills during transportation. Thus, the primary reason for restrictions with certain medications in pneumatic tube systems is the risk associated with spills and potential damage to both the medication and the healthcare environment.