Reported medication errors in obstetric inpatients in 1 hospital.

Objective: To describe reported medication errors in the obstetric inpatients in 1 hospital.

Study Design: We analyzed all errors, reported voluntarily in a nonpunitive manner, from December 1996 to November 2001.

Results: The 164 medication errors led to 154 class 1 (no harm), 10 class 2 (additional therapy but no additional harm) and 0 class 3 (permanent harm) adverse drug events.