Final answer:
Epinephrine is the drug added to local anesthetics in dental procedures to maintain hemostasis by causing vasoconstriction and reducing bleeding.
Step-by-step explanation:
The drug added to dental local anesthetics to maintain hemostasis is epinephrine. Epinephrine, also known as adrenaline, is commonly included in local anesthetic solutions for procedures like dental work because it causes vasoconstriction, which reduces blood flow to the area and aids in controlling bleeding. This property is crucial during dental surgeries and other minor surgical procedures where excessive bleeding can obscure the field and complicate the process.