Dead Is Dead: The Directors Cut (2008)

Eric Shepherd (Mike Stanley) searches for answers into the death of his brother. During this search, Eric is attacked and partially dismembered by some unknown creature. An experimental drug called Doxital heals Eric within 24 hours. Eric uses this drug to pay off a large debt. Unknown to Eric, the drug he gives away is a bad batch and could turn those who take it into walking zombies.