True statement regarding neuraxial opioids for labor and delivery is
Most common side effect of  opioids is pruritis. Since epidural space contains extensive vascular plexus systemic absorption is similar to intramuscular injection.
Opioids should never be used as a sole agent
Most common side effect is fetal bradycardia
Intrathecal morphine is associated with quick peak in concentration and early onset maternal respiratory depression
Systemic absorption is similar to intramuscular