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Table 2 Opioids used in trials of non-malignant pain of different aetiology

From: Prevalence of opioid adverse events in chronic non-malignant pain: systematic review of randomised trials of oral opioids

  Conditiona  
Drug Arthritis Musculoskeletal Neuropathic Mixed All conditions
Codeine 51 46    97
Codeine + paracetamol 173 233   156 562
Dihydrocodeine 119     119
Dextropropoxyphene 129 56    185
Dextropropoxyphene + paracetamol 496     496
Morphine 222 61 59 49 391
Meptazinol   31    31
Oxycodone   47 50   97
Pentazocine 76     76
Tramadol 363 778 110 401 1652
Tramadol + paracetamol 197 309    506
Total 1826 1561 219 606 4212
  1. aValues are numbers of patients treated with the different opioids.