Tramadol is used to relieve moderate to moderately severe pain, including pain after surgery. The extended-release capsules or tablets are used for chronic ongoing pain. The side effects are ... °Abnormal or decreased touch sensation. ° blisters under the skin. ° blood in the urine. ° blood pressure increased. ° change in walking and balance. ° difficult urination. ° dizziness or lightheadedness when getting up suddenly from a lying or sitting position. ° gaseous stomach pain.