Serum 114

Serum 114 is the name given to the drug used during Ludovico Technique in the film. It gained it's name from Ludovico, it's creator.

It's given to Alex under the guise of supplemental vitamins meant to cure his malnutrition caused by the insubstantial food in the state prison. In actuality, it produces paralytic effects and nausea, which is integral in creating an intolerance for violence, sex and classical music.

Trivia

 * 'CRM 114' is a recurrent number within Kubrick's films; in 2001: A Space Odyssey it's the name of an escape pod, Eyes Wide Shut the location of a mortuary and a piece of radio equipment in Dr. Strangelove.