Guidance 4 (Determining an acceptable level)Interim acceptable daily intakes for chronic exposure to several common N-nitrosamines have been defined. See literature reference for EMA interim acceptable daily intake for chronic exposure to common N-nitrosamines. Processes to determine acceptable intakes for all other N-nitrosamines should be in alignment with the EFPIA paper. These levels should be adjusted for less than lifetime exposures as described in ICH M7. Calculate acceptable limits in ppm relative to the substance using the maximum daily dose. Higher limits may be justified for ICH S9 indications.