Gorex: The Zombi Horror Picture Show (1997)

Raimi, a young excursionist, finds a headless body in the woods. He runs for help but is hit by a stranger. He awakes in professor Quentin Foster's laboratory, who has created a new drug (Goresmina) that eliminates the pain. But the drug has got other effects: it increases sexual appetite and turns people into zombies. One stormy night, three girls arrive at Foster's house because of a problem in their car. Without knowing, they will become human experiments.