Non-opioid analgesics: These include drugs such as acetaminophen and nonsteroidal anti-inflammatory drugs (NSAIDs). They are often used for mild to moderate pain. Opioid analgesics: Drugs like morphine, oxycodone, and fentanyl fall into this category. They are used for moderate to severe pain and are often a key component of cancer pain management. Adjuvant analgesics: These are drugs that were originally developed for other conditions but are effective in pain management, such as certain antidepressants and anticonvulsants.