Final answer:
An intrathecal opioid analgesic is a medication that is delivered directly into the spinal fluid to provide pain relief. It is commonly used for chronic pain conditions or for pain management during certain surgeries or procedures.
Step-by-step explanation:
An intrathecal opioid analgesic is a type of medication that is delivered directly into the spinal fluid to provide pain relief. It is commonly used for chronic pain conditions or for pain management during certain surgeries or procedures. The opioids in the medication bind to receptors in the central nervous system, reducing pain signals and providing relief.