Lexorin

Lexorin is a stimulant, much like cordrazine, administered into the bloodstream through the humanoid hand. One of the many drugs and treatments used in making sedated patients able to travel. Suffering from the residual effects of a Vulcan mind meld and his cerebral cortex acting as Spock's katric ark, Dr. Leonard "Bones" McCoy received a dose from Kirk. The admiral needed the doctor for a "long voyage ahead" of them.