Page "Impulse (Star Trek: Enterprise)" Paragraph 8

T ' Pol suffered side-effects and flashbacks from her exposure to Trellium-D, but over the next few months found herself desiring to access more of the new emotions she experienced while under its influence.

She secretly devised a way of liquefying small amounts of the compound which she injected directly into her bloodstream.

The result was a level of increased emotions on her behalf, which initially were beneficial in her dealings with the crew.

However, it also caused her to experience intense negative emotions, such as jealousy.

In the episode " Azati Prime ," T ' Pol's emotions left her incapacitated as a commanding officer, contributing to the deaths of nearly two dozen Enterprise crew members in the ensuing Xindi attack.