This article is from the Dr. Pepper FAQ, by Christopher Flaherty with numerous contributions by others.
In a word: NO!
According to the Urban Legends Reference Pages at snopes.com: "It
doesn't, but the rumor is remarkably long-lived, having been with us
since about 1930."
In addition, Bottlecaps (the "Official Newsletter of the Dr Pepper
Museum and Free Enterprise Institute") emphasizes in their Vol. I,
1999, issue: "Prune juice is not and never has been in Dr Pepper. The
prune juice rumor is an old story that has been in circulation since
Also, the Dr Pepper company states on their website that "prune juice
is definitely not one of the ingredients."
And, as if that wasn't enough, the site for Dr Pepper/Seven Up, Inc.
has offered two different assertions during the past two years: 1)
"its unique flavor comes from the blending of 23 fruits, none of which
are prunes" 2) "Dr Pepper is a unique blend of natural and artificial
flavors; it does not contain prune juice."
The corporation also highlights this "Fun Fact" on its web site:
"Contrary to popular misconception, Dr Pepper never has and never will
contain prune juice."
Are we all clear on this now?