The Food and Drug Administration (FDA or Agency) is announcing the availability of a final guidance for industry entitled “Dissolution Testing and Acceptance Criteria for Immediate-Release Solid Oral Dosage Form Drug Products Containing High Solubility Drug Substances.” This guidance has been developed to provide manufacturers with recommendations for submission of new drug applications (NDAs), investigational new drug applications (INDs), or abbreviated new drug applications (ANDAs), as appropriate, for orally administered immediate-release (IR) drug products that contain highly soluble drug substances. The guidance is intended to describe when a standard release test and criteria may be used in lieu of extensive method development and acceptance criteria-setting exercises.