I was thinking that bram-stokers-dracula would be better as a tag, but not entirely sure so won't retag without people agreeing.
Leave it alone, or add an author tag.
I'm basing this on this meta answer about tagging practices, which addresses how to tag a specific work within a franchise/series. Basically, it advises to specify author's name and franchise tag instead of specific titles/seasons.
There are dozens of books with Dracula in them, Fred Saberhagen (author of the Berserker series) wrote quite a few himself. (In them, Dracula was the anti-hero.)
You should leave it tagged both "book" and "dracula", but it probably should have a third tag. And as BESW suggests, we do need to avoid ambiguity with the 1992 film. Not sure how to do that. Perhaps include the year in the tag name for the film, as wikipedia does for articles.