1. Microdose radiopharmaceutical diagnostic drugs: nonclinical study recommendations Publication: Silver Spring, MD : Center for Drug Evaluation and Research, August 2018 Subject(s): Drug Evaluation, PreclinicalRadiopharmaceuticals -- administration & dosageRadiopharmaceuticals -- pharmacokineticsDiagnostic ImagingDiagnostic Uses of ChemicalsRadiopharmaceuticals -- toxicityHumansUnited StatesUnited States. Department of Health and Human Services.United States. Food and Drug Administration.