What is Bupivacaine Hydrochloride used for?
Likewise, how long do the effects of bupivacaine last? However its effects only last up to 2 hours, without epinephrine, and 3 hours, with epinephrine. On the other hand, Bupivacaine, has a slower onset of action (about 5-10 minutes after injection) but its effects last much longer, for about 4-8 hours.