Does this help?
"It remains uncertain which analgesic or combination of analgesics is responsible for renal damage in man. For this reason it is difficult to define analgesic abuse accurately, but most authors accept the definition proposed by Schreiner: the ingestion of at least 1 kg. of phenacetin and/or salicylate over any period of time. This implies the daily consumption of four to six tablets of analgesic compounds for over three years, but many patients consume many times this amount".
Adam L Linton, 'Recognition of the Problem of Analgesic Nephropathy', Canadian Medical Association Journal Vol.107, Ottowa, October 1972
- citing -
G E Schreiner, 'Definition of Analgesic Abuse', [p.347 'Progress in Pyelonephritis' (Ed. E H Kass)], pub F A Davis, Philadelphia, 1965
Sourced from here:
http://www.ncbi.nlm.n...anmedaj01654-0045.pdf
Chris