This version of the English Drug Dictionary (EDD) includes a list of several thousand drugs approved for use in England. These specialities are distributed, according to their composition, along rich pharmacological classes that allow drug grouping and drug navigation from one family to another.
Database tables downloaded at install time are regularly updated on App Store.
Drug data or Summaries of Products Characteristics (SPC) of drugs are read live on Internet on regularly updated servers. So, you need a WiFi or cellular access to read them.
Search in the database may be done by brand, generic or class names (ATC extended). Navigation from one given drug to its near or distant pharmacological equivalents is easy.