Concept:
Unit dose drug distribution means medicines are supplied in ready-to-administer single doses.
Step 1: Purpose of unit dose system.
Each dose is properly labeled and packed for an individual patient.
Step 2: Reduction in errors.
This reduces wrong drug, wrong dose, and wrong patient errors.
Step 3: Hospital benefit.
It improves medication safety and helps pharmacists monitor therapy.
Step 4: Final answer.
Therefore, unit dose distribution reduces drug errors.
\[
\boxed{\text{Drug errors}}
\]