It has been discontinued in the U.S. because King Pharmaceuticals, which is now part of Pfizer, and which holds the rights to sell Intal in the U.S., was not able to (or did not want to pay enough to) line up a manufacturer to make the HFA version of Intal once their prospective supplier went bankrupt, and once the CFC version could no longer be sold in the U.S. (and elsewhere) (ostensibly for environmental reasons). You can read more about it here:  http://www.in-pharmatechnologist.com/Industry-Drivers/Inyx-drama-highlights-crucial-need-for-due-diligence-on-contractors As you probably know, you can currently buy Intal HFA that is not U.S.-sourced.