Prior to administering pain medication to an adult postoperative client, what information should the practical nurse (PN) obtain? (Select all that apply)

A. Height and weight of client prior to admission: While height and weight are important for certain medication calculations, most standard postoperative pain medications do not require immediate weight-based dosing adjustments for adults. B. History of pain medication use during the past year: Past medication history is useful for assessing tolerance or allergies but is not required immediately prior to administering a scheduled postoperative dose. C. Time of last administration of pain medication: Knowing when the last dose was given helps prevent overdose, ensures proper dosing intervals, and allows assessment of medication effectiveness. D. Client's pain rating on a scale of 1 to 10: Assessing current pain intensity is essential to determine the need for pain relief and to tailor the dose appropriately, following the principle of individualized pain management. E. Effectiveness of last pain medication administered: Evaluating how previous doses controlled pain helps the PN select the most effective medication or adjust timing and dosage to optimize pain control.