Take special care with Effentora If you have any of the following, talk to your doctor or pharmacist before starting Effentora: • Your other opioid pain medicine taken for your constant (around-the-clock) cancer pain is not stabilised yet. • You are suffering from any condition that has an effect on your breathing (such as asthma, wheezing, or shortness of breath). • You have a head injury. • You have an exceptionally slow heart rate or other heart problems. • You have liver or kidney problems, as these organs have an effect on the way in which your system breaks down the medicine. • You have low amount of fluid in the circulation or low blood pressure