A 4 yr old child is shy, timid, and fearful. Which of the following will be MOST appropriate for the restorative appointments for this child?

Nitrous oxide/oxygen

Naloxone

Promethazine

Hydroxyzine hydrochloride (atarax) or hydroxyzine pamoate (Vistaril) in divided doses

Meperidine (Demerol), promethazine (Phenergan) and chlorpromazine (Thorazine) combined