WHO List of Essential Medicines which is published by the World Health Organization and is a concise list (no pictures) of the lowest cost and most effective drugs for treating common conditions. Probably not what the requester wanted but possibly of use to someone in the medical field.
If you are just looking for a way to identify pills, thePill Identifierat Drugs.mobi:, drugs.mobi/pillid.phpis an easy to use mobile web site that lets you search for pills by color, shape or imprint and has pictures.
* Usage Instruction:
Press keys 'LEFT' or 'RIGHT' to select topics.