Used primarily as an intermediate in the synthesis of opioid analgesics. Plays a key role in the production of semi-synthetic opioids such as oxycodone, hydrocodone, and hydromorphone. These derivatives are widely used in medicine for the management of moderate to severe pain. Due to its structural similarity to morphine, it serves as a foundational compound in pharmaceutical research focused on pain relief and opioid receptor modulation. Its derivatives may also be studied for their effects on addiction, tolerance, and respiratory depression. Strictly regulated due to potential for misuse and conversion into controlled substances.