A patient is to receive cephalexin (Keflex), 500 mg by mouth. The pharmacy has sent 250-mg tablets. How many tablets does the nurse give?

Rationale:
A. Set suction regulator at 150 to 200 mmHg is too high; excessive suction pressure can damage mucosa and cause hypoxemia. The safe range is generally 80–120 mmHg for children and 100–150 mmHg for adults.
B. Limit the length of suctioning to 10 to 15 seconds is correct because prolonged suctioning increases the risk of hypoxia, bradycardia, and mucosal injury.
C. Liberally lubricate the end of the suction catheter with a water-soluble solution is not recommended; catheters are usually moistened with sterile saline if needed, not lubricated.
D. Apply suction while gently rotating and inserting the catheter is incorrect because suction should only be applied during withdrawal, not insertion, to prevent airway trauma.

A. Asking the patient to confirm their name is insufficient. The nurse should use at least two identifiers (e.g., full name and date of birth) instead of just reading the name aloud.
B. Nurses—not pharmacists—are responsible for independently calculating and verifying dosages before administration.
C. The nurse should check the medication label three times (when removing, before preparing, and at the bedside), not just once.
D. Interpreting illegible handwriting is unsafe. The nurse must clarify immediately with the prescriber before giving the medication.
E. Closing the door of the medication room helps minimize distractions and interruptions, reducing the risk of medication errors.