Final answer:
Pentothal (Thiopental) is not a long-acting barbiturate.
Step-by-step explanation:
Pentothal (Thiopental) is a barbiturate drug that is commonly used as an intravenous anesthetic. It is classified as an ultra-short-acting barbiturate, not a long-acting one.
Learn more about Pentothal (Thiopental) and its classification