Montesi Formula is a 4-part story arc that wraps up several vampire related storylines, in issues #59-62 of the 2nd volume of Doctor Strange written by Roger Stern.
Synopsis
The Sorcerer Supreme Doctor Strange and his allies use a spell from the Darkhold to put an end to the vampire threat.
Note
The vampires of Marvel Earth are part of the Mythos. Being created by the Darkhold (the source of the Necronomicon), which was created by Chthon, an Old One. The Darkhold not only has a spell which creates vampires but one that destroys them. Vampires have used the Darkhold to enhance themselves and Dracula, the Lord of Vampires was himself destroyed and restored by the Darkhold, and has used it to increase his powers.