Used in the treatment of moderate to severe pain, particularly in cases of chronic pain such as that associated with cancer. It is effective when other pain relievers are not sufficient. The drug provides around-the-clock pain management by acting on the central nervous system to alter pain perception. Often prescribed in controlled-release formulations to maintain consistent pain relief over extended periods. Also utilized in palliative care settings to improve quality of life by managing persistent pain. Requires careful dosing and monitoring due to potential for dependence, respiratory depression, and other side effects.