The purpose of this study is to evaluate the impact of extended release tramadol hydrochloride (75 mg) and acetaminophen (650 mg) tablets on improvement of pain.
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Inclusion Criteria: * Patients with the prescription of ULTRACET ER for the treatment of moderate to severe pain * Complaining of chronic pain for more than 3 months Exclusion Criteria: * Patient who had been treated with extended release tramadol hydrochloride (75mg) and acetaminophen (650mg) or strong opioids (eg, morphine, fentanyl, oxycodone, hydromorphone) within the past 4 weeks * Patient with a severe mental disease and with a medical history of hypersensitivity to opioid analgesics * Pregnant females or the females likely to become pregnant during the study period * Patient who had been believed likely to complain of more pain than the real pain he or she is experiencing because of industrial disaster, car insurance, and others * Patients who are contraindicated according to the warnings, precautions and prohibitions regarding extended release tramadol hydrochloride (75mg) and acetaminophen (650mg)