This is an open-label (all people know the identity of the intervention) study. A total of 35 participants will be enrolled in this study. Participants will receive tablet of combination of tramadol HCI (37.5 mg)/acetaminophen (325 mg) on Day 1. Participants may increase their daily dosage of study medication as 1 to 2 tablets every 4 to 6 hours as needed for pain relief, up to maximum of 8 tablets per day. Rescue medication consisting of Extra Strength Tylenol (500 mg) 2 tablets daily for the first six days of the Open-label Phase will be allowed so that the total daily dose of acetaminophen will not exceed 4,000 mg. The total duration of the study treatment for each participant will be approximately 6 weeks. Safety will be evaluated by assessment of adverse events, clinical laboratory tests, skin site assessments, vital signs, and physical examination which will be monitored throughout the study.
The purpose of this study is to evaluate the analgesic (painkiller) effectiveness and safety of combination of tramadol HCI (37.5 mg)/acetaminophen (325 mg) in the treatment of chronic cancer pain.