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WHO classification of pain treatment
| Class | Description | Examples |
|---|---|---|
| I | nonopioid analgesic drugs | nonsteroidal anti-inflammatory drugs, acetaminophen |
| II | weak opioids (+ nonopioid analgesic drugs) | tramadol, codeine |
| III | strong opioids (+ nonopioid analgesic drugs) | morphine, piritramid, meperidine |
