This is NOT a vampire movie in the classic sense. There is no sanguinarian sucking of blood or bats flying in the night. This story is more about psychic vampires who feed on the life force of others, harnessing it as an elixir for healing. It's not the worst movie I've ever seen, but it's not the best either. This Italian film, dubbed into English, is the stuff of late night horror fests. You can find this one in a number of cheap horror compilations, stream it for free online, or download your very own copy on archive.org.
Download a copy of the film from Archive.org
For more info check out the film's entry in IMDB.