The E 506 /30mg, peach tablet, sweet taste. The other is LCI 30 round, peach, 30mg. The E 506 is manufactured by Elite. The LCI 30 doesn't list a manufacturer. They appear to have the same ingredients, they do work somewhat different though. What is the difference, there must be something ? Just wondering. Anyone know ? I've been dispensed both under the same prescription at different times. Why two Instant realize dexamphetamine/Amphetamine IR tablets by Lannett ?