What is the purpose of adding epinephrine to local anesthetics?

Epinephrine is added to local anesthetics to prolong their duration of action and enhance their effectiveness. It works by constricting blood vessels at the injection site, which reduces blood flow and minimizes the rate at which the anesthetic is absorbed into the bloodstream. This not only helps maintain a higher concentration of the anesthetic in the targeted area but also reduces the risk of systemic toxicity. Additionally, the vasoconstrictive effect can also help control bleeding during surgical procedures.