Bupivacaine
Local anaesthetic drug
Bupivacaine, sold under the brand name Marcaine among others, is a medication used to decrease sensation in a specific small area. In nerve blocks, it is injected around a nerve that supplies the area, or into the spinal canal's epidural space. It is available mixed with a small amount of epinephrine to increase the duration of its action.
From Wikipedia, under CC BY-SA. More on occurri.