Title: Benzphetamine
CAS Registry Number: 156-08-1
CAS Name: (aS)-N,a-Dimethyl-N-(phenylmethyl)benzeneethanamine
Additional Names: N-benzyl-N,a-dimethylphenethylamine; d-N-methyl-N-benzyl-b-phenylisopropylamine
Molecular Formula: C17H21N
Molecular Weight: 239.36
Percent Composition: C 85.30%, H 8.84%, N 5.85%
Literature References: Prepd from d-desoxyephedrine: Heinzelman, Aspergren, US 2789138 (1957 to Upjohn).
Properties: Liquid. bp0.02 127°. nD19 1.5515. Practically insol in water. Sol in methanol, ethanol, ether, chloroform, acetone, benzene.
Boiling point: bp0.02 127°
Index of refraction: nD19 1.5515
Derivative Type: Hydrochloride
CAS Registry Number: 5411-22-3
Trademarks: Didrex (Pharmacia & Upjohn); Inapetyl (Pharmacia & Upjohn)
Molecular Formula: C17H21N.HCl
Molecular Weight: 275.82
Percent Composition: C 74.03%, H 8.04%, N 5.08%, Cl 12.85%
Properties: Crystals from ethyl acetate, mp 129-130°. Dextrorotatory. Sol in water, 95% ethanol.
Melting point: mp 129-130°
NOTE: This is a controlled substance (stimulant): 21 CFR, 1308.13.
Therap-Cat: Anorexic.
Keywords: Anorexic; CNS Stimulant.
Benzpiperylon Benzpyrinium Bromide Benzquinamide Benzthiazide Benztropine Mesylate

Benzphetamine 3d.gif
Systematic (IUPAC) name
Clinical data
Trade names Didrex
AHFS/ Consumer Drug Information
Legal status Schedule III (US)
Pharmacokinetic data
Protein binding 75–99%
CAS number 156-08-1 YesY
ATC code None
PubChem CID 5311017
DrugBank DB00865
ChemSpider 4470556 YesY
UNII 0M3S43XK27 YesY
Synonyms N-benzyl-N-methylamphetamine
Chemical data
Formula C17H21N 
Mol. mass 239.355 g/mol
 N (what is this?)  (verify)

Benzphetamine (Didrex) is an anorectic drug marketed under this brand in the USA by Pharmacia. Benzphetamine is used as a short term adjunct in management of exogenous obesity. It is closely related to amphetamine.