There is a german DVD version that is cut down to 72 minutes. All blood and violence is edited out.
The UK DVD release on the Stonevision label is the fully uncut Italian version.
USA version was re-edited and altered by distributor Aquarius Releasing Inc. and re-titled "Doctor Butcher, M.D.". Among the changes:
A new, completely pointless and unrelated opening title sequence featuring a zombie rising from a grave, which is actually taken from an unfinished anthology "Tales To Rip Your Heart Out".
The original "serious-sounding" musical score was replaced with a cheesy and wonderfully irritating synthesizer one.
Some dialogue and character "development" were deleted for pacing reasons.
Even though the "Doctor Butcher" version is cut, there is an extra five minute sequence that takes place after Peter kills the "sneaking zombie" with an evanrude. In this scene, Peter and Lori are trying to get back to Obrero's hut. As they're walking, Lori falls into a trap, just missing a set of bamboo stakes sticking upward. As Peter attempts to pull her out, he sees two cannibal tribesmen and tells Lori to stay where she is and he hides behind a nearby tree. As the two cannibals see Lori in the trap, Peter runs out and hits one cannibal in the back of the head with a large stick, knocking him into the bamboo stakes. He then faces off with the remaining cannibal and beats him multiple times with the same large stick. He then finally gets Lori out and they continue to walk in search of Obrero. This sequence is in all "Doctor Butcher" cuts, including the out of print Japanese laserdisc release. Also, while the scene is missing from the film itself on the Shriek Show American DVD release (due to using the original Italian cut), it is on separately as a deleted scene. Also, it is unknown if this scene was originally filmed and then cut from the final Italian print of the film, or if Ian McCulloch and Alexandra Delli Colli were actually hired by Aquarius Distribution (the owners of the "Butcher" cut) to come in and film this new scene. The latter seems more likely as the scene's setting looks less like a jungle, and more like someone's backyard.