We investigated the effect of oral analgesics for patients with cancer pain, retrospectively. One hundred forty six cases were randomly selected during the period between 1986 to 1990. These patients were treated with Tramadol (n=31), Tylenol III(Acetaminophen plus codein phosphate, n=44) or MS-Contin (n=71). partial to complete pain relief as achieved accord to each durg group at 67.8, 68.2 and 76.1% respectively. Minimal side effects were noted in a few patients. Our results show encouraging possibilities for pain control in cancer patients. However, futher studies should be done to find more effective cancer pain management by oral analgesics.