Zyme

Zyme (meaning "a ferment") is a synthetic drug. Zyme Vials appear as consumable items in Deus Ex.

Background
Zyme appears to have originated in New York City, and is regarded as recent drug in 2051. Zyme has been theorized to be the cause of an outbreak of mental illness. According to one public official, Zyme has become a threat to the public welfare and there have been discussions in the United States government to implement a zero-tolerance solution in regards to Zyme.

Post-Collapse greasel trainers utilize zyme to increase the aggressiveness of their greasels.

Game item in Deus Ex
Consuming a Zyme Vial will trigger a "delirium" effect for 60 seconds.

A Zyme dealer named Rock can be encountered in the Brooklyn Bridge Station. A vial of Zyme can be purchased from him and given to Lenny in exchange for a LAM.

In the Aucun Dites Motel in Paris, the mobster Renault will offer JC Denton the job of robbing a Zyme stash from the Boulangerie Centrale bakery. Renault will pay for any Zyme that JC is carrying, regardless if they were not stolen from the bakery. Since 20 vials of Zyme can be carried in the inventory at once, 1,300 credits can be earned from Renault. In order to receive the maximum amount of credits per vial, JC must refuse to sell Renault the vials once, which will cause Renault to increase his buying price.

If the player uses Zyme themselves, an interesting visual effect occurs. Continued consumption can cause the players vision to "zoom in" considerably, making simple controls difficult.