How long is one dose of albenza (albendazole) active and work to kill worms in the body?

Depends on the worm: Different types of worms have different recommended dosing schedules for albendazole. Dosing can range from 1 day (for pinworms) to several weeks for other parasites (sometimes several months). A single dose starts working in a few hours. The reported half-life for a single dose is 8-12 hours, which means after 8-12 hours, half the medicine is gone from the body, or has been made non-active.