A nurse is replacing an empty PCA bag. The pump label is set to morphine 1 mg/mL. The new bag from pharmacy is labeled hydromorphone 0.2 mg/mL. The pump is about to be restarted. Which is the priority nursing action?

PCA programming errors are well-documented and frequently fatal in pediatric and adult settings. Two most common errors: (1) wrong drug entry — programming morphine when hydromorphone is in the bag, or vice versa, with up to 7-fold dose error; (2) wrong concentration — programming 1 mg/mL when the bag is 0.2 mg/mL or 5 mg/mL. ISMP best practices: (1) any change in drug, concentration, or bag is a high-alert checkpoint requiring an independent two-nurse double check at the bedside, including verification of the order, drug name, concentration, dose limits, basal/demand/lockout, patient identifier, and pump display; (2) use smart pumps with drug libraries and dose error reduction software (DERS) configured for the institution; (3) scan medication and patient (BCMA) when supported; (4) standardize concentrations across the institution to limit confusion; (5) post a label on the pump showing the active drug and concentration; (6) never assume opioid equivalence — hydromorphone 0.2 mg/mL is a different total dose than morphine 1 mg/mL even at identical demand volumes. Restarting without verification, mixing remnants, or delaying pharmacy contact are all unsafe. The nurse stops, verifies, reprograms, and double-checks before any restart.

Drug or concentration changes are high-alert checkpoints. Stop, verify, reprogram, and double-check — never auto-restart on the prior program.