Many countries around the world have a very low per capita consumption of opioid analgesics, which is probably related to absence or inadequate management of moderate and severe pain for large parts of their populations. We conducted a longitudinal observational study with opioid analgesic consumption data for all countries from 2000-2015, to assess 2015 per capita consumption data for strong opioid analgesics and to investigate the hypothesis that inequality decreased over the years 2000-2015. We based our study on the official statistics kept by the International Narcotics Control Board, built on data submitted by governments annually. Adequate consumption was defined as the average 2015 opioid analgesic consumption of the 20 most-developed countries, or above. In addition, we defined categories of moderate, low, very low and extremely low consumption, each category differing 0.5 on a logarithmic scale. Consumption was expressed as the AOC Index. The direction of inequality in consumption between different countries' development levels through the years 2000-2015 was assessed using a mixed effects model. We found that the average consumption of the 20 most-developed countries was 256 ± 208 mg per capita (range 5.9-778) in 2015. In all, 119 countries did not have a moderate or adequate consumption of opioid analgesics. Inequality of adequacy of consumption between low- and highly-developed countries increased from 2000 to 2015. The world needs 1867 tonnes ME for treating pain with opioids analgesics at an adequate level (actual use: 365 tonnes or 19.5% of the global need). We concluded that in 2015, almost 6.5 billion people lived in countries where opioid analgesic consumption was low, very low, or extremely low.
Keywords: Analgesics; Health Policy; Needs Assessment; Opioids; Pain Management.