Chlorphentermine (trade names Apsedon, Desopimon, Lucofen) is a serotonergic appetite suppressant of the amphetamine family. Developed in 1962, it is the 4-chloro derivative of the better known appetite suppressant phentermine, which is still in current use. 
Chlorphentermine acts as a highly selective
serotonin releasing agent (SRA). It is not a  psychostimulant and has little or no abuse potential, but is classed as a Schedule III drug in the USA due mainly to its similarity to other appetite suppressants such as diethylpropion which have been more widely abused. It is no longer used due mainly to safety concerns, as it has a serotonergic effects profile similar to other withdrawn appetite suppressants such as fenfluramine and aminorex which were found to cause pulmonary hypertension and cardiac fibrosis following prolonged use. 
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References [ edit ]
^ Gylys JA, Hart JJ, Warren MR. Chlorphentermine, a new anorectic agent. Journal of Pharmacology and Experimental Therapeutics. 1962 Sep;137:365-73.
^ Rothman RB, Baumann MH, Dersch CM, Romero DV, Rice KC, Carroll FI, et al. (2001). "Amphetamine-type central nervous system stimulants release norepinephrine more potently than they release dopamine and serotonin.". Synapse 39 (1): 32–41. doi: 10.1002/1098-2396(20010101)39:1<32::AID-SYN5>3.0.CO;2-3. PMID 11071707.
^ Rothman RB, Ayestas MA, Dersch CM, Baumann MH. Aminorex, fenfluramine, and chlorphentermine are serotonin transporter substrates. Implications for primary pulmonary hypertension. Circulation. 1999 Aug 24;100(8):869-75.