"When interviewing pharmaceutical sales representatives, employers are looking for candidates with expert sales skills accompanied by a strong knowledge of pharmacology. Expect to answer a mix of technical questions about the uses and effects of different drugs as well as sales questions how you would go about marketing them to doctors. Although not mandatory, receiving certification as a Certified National Pharmaceutical Representative (CNPR) will ensure you walk into interviews with a competitive pharmacological background."
Tell me when you made a mistake
Turned it into a positive...and emphasized what I learned from it.