The effects range from physical effects to depression.
Some vampires develop substitute addictions who can range from chocolate to more serious drugs.
Many Sanguinarians suffer from various forms of eating disorders. Few vampires attack people or want to harm them. The risk of an infection is very high and should always be considered. The least problematic possibility is to go to your local butcher, who will sell you animal blood in larger amounts at low cost. Getting human blood is much more difficult.