What is a critical difference between vesicant and non-vesicant drugs?

• A. Vesicants are always ineffective.
• B. Vesicants do not require monitoring.
• C. Non-vesicants cause more pain at infusion.
• D. Vesicants can cause severe tissue injury if extravasation occurs.

Answer: (D)

The important concept is that vesicant drugs have the potential to cause severe tissue injury if they leak out of the vein into surrounding tissue (extravasation). This risk of serious damage is what distinguishes vesicants from non-vesicants and drives the need for careful IV monitoring, immediate action if extravasation occurs, and sometimes use of antidotes or specific infusion techniques. Therefore, the best answer is that vesicants can cause severe tissue injury if extravasation occurs. The other statements aren’t correct: vesicants are not inherently ineffective, they do require monitoring, and non-vesicants do not typically cause more pain at infusion than vesicants.