BUFFALO GROVE, Ill.--(BUSINESS WIRE)--Sept. 18, 2006--Akorn, Inc. (AMEX:AKN) today announced that it has received a purchase order from the Department of Health and Human Services (HHS) for the procurement of Ca-DTPA and Zn-DTPA. This order represents a partial exercise of a purchase option that was awarded to the Company by HHS on December 30, 2005, for the acquisition of up to an additional one million units of Ca-DTPA and Zn-DTPA by the United States Government.