[Pain therapy of urologic tumors -- prophylaxis and therapy of side effects]

Pain is a cardinal symptom in 70 % of cancer patients. Even in developed countries, 30 to 80 % of these patients are inadequately treated. The main cause for this lack of care is not pain refractory to treatment but inadequate or incorrect use of analgesic drugs. A sufficient treatment of pain requires knowledge of the pathomechanism of pain and of the basics of pain management in cancer patients. The choice of analgesic drugs follows the WHO-recommended increase based on need. As long as possible, analgesic drugs should be given orally following a strict schedule and pre-emptively prior to renewed pain. The non-opioids are a heterogeneous group of drugs with different actions and side effects. Maximum doses exist for this group and weak opioids. A change to strong opioids is indicated when weak opioids fail to achieve sufficient pain control despite titration to the maximum dose. No upper limit exists for strong opioids and their use is limited by the side effects. The most frequent side effects are initial emesis and vomiting as well as long-lasting constipation. For this reason, most patients should be prescribed a temporary antiemetic and a laxative on a permanent basis.