DynaMedex "combines the clinical expertise and extensive, curated disease content of DynaMed with the comprehensive view into treatment options, depth and breadth of drug information and advanced search capabilities of Micromedex" (source).
In short, it is a point-of-care tool to support decision-making and patient education.
DynaMedex combines all the point-of-care decision-making information of DynaMed with the drug information of Micromedex!