Drugged by Aliens

Before they leave to outer space for an unknown amount of time, a gigantic green alien, human female Antaska, and her telepathic cat visit the alien's home planet. Unfortunately, some of the aliens who are stuck for life on the home planet take strong drugs to deal with their boredom and depression. One of the giant aliens gives those drugs to her much smaller earthling companion. This human takes a dislike to Antaska, and gives her an overdose of the super-powerful drug. Antaska has a near death experience and is rescued by her telepathic cat.

Drugged by Aliens is book 4 in the They Are Here series:

Interstellar visitors arrive on and around Earth and take over. Their true nature is a mystery to humans. If you ever wonder what the many extraterrestrial objects that travel through our solar system might be, this unusual science fiction comedy has answers.