Many pharmacies use whatever companies products are currently available to to dispense. Shire's name brand products are often covered under all but a few insurance companies. It is the "most effective" in Shire's opinion. Teva, a Israeli pharmaceutical firm, as well as others make generic off shoots of mixed amphetamine salts cocombinations. They may be in short supply in areas. Small independent pharmacies are not allotted as many of these CII stimulates. Paying cash is preferred by pharmacies if generic substitutions are not marked or not in stock. One takes what one can afford or even find. My MD always issues me three different but similar Rx's and DOES NOT label them "NOT TO BE ISSUED A MONTH APART." A issuance of a Rx of a CII like generic Adderal's...