Levoamphetamine increases concentration.
, equal parts) mixture of the free bases or sulfate salts of both amphetamine enantiomers (levoamphetamine and dextroamphetamine) that was introduced in the United States in 1934 as an inhaler for treating nasal congestion
Enantiopure levoamphetamine succinate was sold in Hungary between 1952 and 1955 under the brand name Cydril

