Concept:
Dispensing errors occur when wrong medicine, wrong strength, or wrong instructions are given.
Step 1: Some drug names look similar.
Step 2: Some drug names sound similar when spoken.
Step 3: These are called LASA drugs.
Step 4: LASA drugs are a common cause of dispensing errors.
\[
\boxed{\text{Look-alike and sound-alike drugs}}
\]