Assure the interviewer that you can handle working in a constantly changing environment. You can handle demanding customers, maintain professional relationships and fill prescriptions. Give an example that demonstrates your ability to manage stress in your life.
"Being able to spend my down time with my family is my stress relief. I enjoy gardening as well as reading in the sunshine."
"I make sure that I take lunch or at least a 30 minute break away from the pharmacy each day. Leaving the pharmacy gives me time to clear my mind and relax during my shift."