I work in chemical synthesis, and I definitely included it, along with a few other jobs I have had, in my experiences section. One was directly referenced in my PS, so I of course included that and expanded on it a bit. I included the job I had most of my undergraduate career, including my post-bach to indicate I maintained my grades while working x hours. Finally, my current job is a full-time job during which I have advanced in while getting married, my wife having a baby, taking courses toward a BS in Chemistry, etc. so I included that as well.
Unless there is some specific reason to exclude work experience, it can only help you by showing that you actually have done things not directly related to medicine, have maintained a job during school, etc.