Original sentence: Thiopental has a half-life of approximately 11.5 hours (however, the action of a single dose is terminated within a few minutes by redistribution of the drug from the brain to peripheral tissues) and the long acting phenobarbital has a half-life of approximately 4–5 days
Edited sentence: The "ultra-short" acting thiopental has a half-life of approximately 11.5 hours (however, the action of a single dose is terminated within a few minutes by redistribution of the drug from the brain to peripheral tissues) and the long acting phenobarbital has a half-life of approximately 4–5 days