A powerful stimulant that Dr. McCoy carried in his standard medikit on stardate 5483.7 (2269). Use of this drug helped to sustain the lives of McCoy and the other members of a landing party on the second planet of the Taurean system — Captain Kirk, Commander Spock, and Lieutenant Carver — while the life forces of the landing party were being drained away and consumed by the women living on the planet.