my way to deal with vampires is to bite them back too, and then insert some form of harmful substance into their blood, with varying effects, including:
liquid forms of gases (e.g. methane or nitrogen): freeze
mercury: toxic
lava: burn
gasoline: good smell but flammable
cyanide: poisonous
swarm of angry bugs: for the extra bad vampires
uranium or plutonium: radioactive
polonium: super radioactive, for the extra extra bad ones