It was originally conceived as a TV series by constantine and maguire, and it became a massive hit during its run from 1998 to 2006.
However, there are several books that were inspired by the show, including:
* "Charmed: The Book of Shadows" - a collection of spells, potions, and other magical elements featured in the show.
* Several novels that continue the story of the Halliwell sisters, written by different authors.
So while "Charmed" isn't based on a book, it has inspired a lot of related literature.