The addition of epinephrine to some local anesthetic drugs

a) binds to dopamine receptors in the cell wall
b) prolongs the anesthetic effect of the drug
c) decreases blood pressure and heart rate
d) inhibits the release of prostaglandins to decrease pain

prolongs the anesthetic effect of the drug

Explanation:

The epinephrine acts as a vasoconstrictor agent to some local anesthetic drugs. The systemic absorption slows down with the addition of 5 micrograms per mL of epinephrine. The epinephrine enhances the anesthetic effect of the drugs. It act as a adjuvant in local anesthetic drugs. The adjuvant increases the effect of immune response. The epinephrine also act as drug for anaphylactic reaction during emergency. The dopamine receptors are present in CNS. The epinephrine is not involved in lowering blood pressure and low heart beat. The epinephrine stimulates secretion of prostaglandins.

Thus, option B is correct. So, the addition of epinephrine to some local anesthetic drugs prolongs the anesthetic effect of the drug.

a, i am pretty sure.