If you lack a specific background in science education or work experience in the field, there is no need to sugarcoat things here as your interviewer will see right through that. What you need to do if this scenario points to you is let your interviewer know that you are confident in your ability to join their team and do what is necessary to study and learn the products you will be selling and the science behind their development and the cures they provide.

"While it will certainly be a new world for me in pharmaceutical sales, I've always prided myself on knowing the products I sell like the back of my hand and it takes hours of reading and talking to experts to be able to speak knowledgeably to key decision makers. I have no doubts about my ability to join your team and learn about this fascinating line of products and their benefits in no time at all. As an experienced sales professional, this would be a top priority if I were to start here in the future."