Return of the Living Dead 5: Rave to the Grave

A college student finds a canister in his uncle's attic that contains a drug more potent than Ecstasy. When word of the drug, nicknamed "Z" for its Zombie-like hallucinogenic effects, reaches unscrupulous college drug dealer Skeet, he hatches a plan to sell the drug to ravers attending the ultimate rave party. But when the drug's side effects start to kick in, the ultimate rave turns into the ultimate grave as party goers drop to their death... then rise again to feed! (official distributor synopsis)