maximum permissible dose
defined by the International Commission on Radiological Protection as the greatest dose of radiation which, in the light of present knowledge, is not expected to cause detectable bodily injury to persons at any time during their lifetime. This dose has been reduced with each Commission report. The MPD is given in terms of acute or chronic exposure of the whole body or of organs, systems, or regions of the body and differs for persons who are occupationally exposed versus the public at large.
Search Stedman's Medical Dictionary
Examples: glitazone, GI cocktail, etc.