I have been taking sertraline 25mg. for a few years and had no problem with it or side effects but now I have COPD so I also take Mucus relief DM tablets and wonder if there is some conflict between these two drugs. I am now getting dizzy, very tired and weakness in my legs. I also take inhalers that are steroids, but this is not new. This problem started when the drug store changed manufacturers for the Sertraline.