Why is epinephrine a common additive in injectable anesthetics?

Explanation:

The addition of epinephrine at 1:100,000 to 200,000 (5 to 10 μg per mL) is useful to prolong the duration of anesthesia and provide some degree of hemostasis. when working on highly vascular tissues such as the scalp, the physician may need to wait between injection and surgery.

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