What are natural and synthetic substances included in heroin that can be prescribed for pain relief?

Heroin is classified as an opioid, which refers to a category of drugs that includes both natural substances derived from the opium poppy (such as morphine and codeine) and synthetically manufactured compounds that mimic the pain-relieving effects of these natural substances. Opioids work by binding to specific receptors in the brain and other parts of the body, effectively reducing the perception of pain.

While analgesics is a broad term that includes any substance used to relieve pain, the term "opioids" specifically identifies the class of drugs that encompasses both natural and synthetic substances like heroin that are specifically known for their analgesic properties. Therefore, opioids represent a more precise classification that accurately describes the nature and action of heroin and similar substances used for pain management. Stimulants and antidepressants, on the other hand, serve different therapeutic purposes and are not primarily used for pain relief.