Adrenaline Adrenaline ( C H O N ) , also known as epinephrine , was a hormone and neurotransmitter with powerful effects on the sympathetic nervous system . As a drug , it was used to treat radiation poisoning . Although by 2267 it had been replaced in clinical use by hyronalin , an adrenaline serum was found to be effective in the treatment of an unknown radiation left over by particle s originating from a comet that passed near Gamma Hydra IV . The radiation had caused an hyperacceleration of the aging process . ( ) In 2154 , Doctor Phlox found that Kelby was suffering from dangerously high levels of adrenaline , brought on by pheromone s from Orion slave girl s . ( ) In 2266 , navigator Bailey mentioned to Spock that his raising of his voice did not indicate that he was scared , but that he just had a Human thing called " " an adrenaline gland " " . Spock remarked that it was most inconvenient and suggested that he have his removed . ( ) In 2267 , Leonard McCoy compared the growing imbalance of body functions within Spock to huge amounts of adrenaline constantly being pumped into the Human blood stream . ( ) Later that year , during the ' s visit to Gamma Hydra IV to check up on its colonist s , it was discovered that they had all died of hyperaccelerated aging . Ensign Pavel Chekov discovered a dead body and it had startled him , causing adrenaline to be released into his system . The adrenaline protected him from the radiation sickness . McCoy realized the adrenaline connection and synthesized an adrenaline hypo shot for the rest of the infected crew . ( ) In 2285 , Nyota Uhura asked " Mr . Adventure " if his adrenaline were going while aiming her phaser at him , just prior to shutting him in a closet . ( ) In 2364 , Natasha Yar discouraged Worf from trying to talk Korris into surrendering as he ( Korris ) was running on adrenaline . ( ) In 2367 , Doctor Beverly Crusher was trapped in a warp bubble in which her own thoughts created her reality . As crewmembers of the began disappearing around her , she performed a medical exam on herself . The only abnormality she found was an elevation of adrenaline , but she considered this understandable , given her situation . ( ) Later that year , Crusher found that Deanna Troi ' s adrenaline by - products were higher than baseline after she had had a sudden fright in her quarters . ( ) In 2372 , Kira Nerys described being a terrorist as " " living on hate and adrenaline " " . ( ) Soon after , Smiley said he ’ d get to know the in battle by commenting " " a little on - the - job training [ would ] get the adrenaline pumping . " " ( ) In 2373 , Lieutenant Tuvok ' s adrenaline level rose by 113 % when he first experienced an event that was thought to be a repressed memory but was actually caused by a memory virus . ( ) That same year , Michael Eddington commented that an encounter with Jem ' Hadar warship s in the Badlands had " " got the adrenaline pumping " " . ( ) In 2374 , The Doctor found that Seven of Nine ' s adrenaline levels were slightly elevated , which was consistent with her state of heightened tension . ( ) Later that year , Julian Bashir was concerned that as Molly O ' Brien ' s body was flooded with adrenaline , confinement in a holding cell might send her into shock . ( ) In 2375 , Ezri Dax recalled the adrenaline surges that Torias Dax , Curzon Dax , and Jadzia Dax had experienced when they went into battle . ( ) In 2377 , after The Doctor ' s program had been downloaded into Seven ' s cybernetic matrix , he experienced the sensation of a surge of adrenaline through her veins ( ) In 2379 , Dr . Crusher found that Deanna Troi ' s adrenaline levels were slightly elevated after a telepathic attack by the Reman Reman Viceroy . ( )