This article examines and compares data on accidental & suicidal deaths from overdose (1992 United Kingdom), & suggests that suicide rates among addicts are underestimated. Reasons for lower estimates, risk factors, & non-fatal overdose are discussed. The overriding feature of fatal oversdoses appears to be the use of a range of substances including opiates, alcohol, and benzodiazepines. Actions to reduce drug-related mortality are suggested. (26 Refs.)