for suicides (Table ). There was no significant trend in deaths of undetermined intent (from 0.51 to 0.79 per 100 000 persons; trend: 0.02 [95% CI, −0.08 to 0.13]) (Figure). During this period, the percentage of opioid-related deaths that was unintentional increased from 73.8% to 90.6%, suicides decreased from 9.0% to 4.0%, and deaths of undetermined intent decreased from 17.2% to 5.4% (all P < .001). Significant increases in opioid-related suicide rates were observed for males, females, all racial/ethnic groups, and all age groups, except between the ages of 35 and 44 years (Table ).Discussion | Between 2000 and 2017, the percentage of opioidrelated deaths that were suicides declined from 9.0% to 4.0%. Despite this proportionate decline, the rate of opioid-related suicides as well as unintentional deaths significantly increased. Recent increases in overdose deaths involving heroin and nonmethadone synthetic opioids, including fentanyl, 3 likely contributed to these trends.Limitations include that proportionately fewer drug overdose deaths did not have information on the specific drug during the study period (decreasing from approximately 25% to 12%), related to increasing toxicological screening, 4 which may have contributed to the increase in opioid-related deaths over time. Also, the validity of coroner or medical examiner determination of manner of death is uncertain 5 and may have changed over time. In some cases, discerning the intent of overdose deaths may be difficult and an unknown proportion classified as undetermined intent may have been suicides. With greater public appreciation of the opioid epidemic since 2010, certifiers may be more likely to consider opioid overdose deaths as unintentional, thereby contributing to the proportionate declines in suicides and undetermined deaths.While the public health crises of opioid overdose deaths and suicide do not appear closely linked, it is nevertheless possible that the national increase in suicides may be partly related to increasing opioid overdose deaths. A better understanding of the contribution of suicidal intent to opioid overdoses could inform suicide prevention efforts, especially considering the high risk of suicide following nonfatal opioid overdose.