Fentanyl Buccal Tablets for Exercise Induced Breakthrough Dyspnea

The goal of this clinical research study is to learn if fentanyl can change perception of shortness of breath in cancer patients. Researchers also want to learn if the study drug can help to improve your physical function. In this study, fentanyl will be compared to a placebo. Fentanyl is commonly used for treatment of cancer pain. A placebo is not a drug. It looks like the study drug but is not designed to treat any disease or illness. It is designed to be compared with a study drug to learn if the study drug has any real effect.