Didrex  

Benzphetamine
Systematic (IUPAC) name
(2S)-N-benzyl-N-methyl-1-phenylpropan-2-amine
Identifiers
CAS number	156-08-1
ATC code	none
PubChem	5311017
DrugBank	APRD00759
ChemSpider	4470556
Chemical data
Formula	C17H21N
Mol. mass	239.355 g/mol
SMILES	eMolecules & PubChem
Synonyms	N-benzyl-N-methylamphetamine
Pharmacokinetic data
Bioavailability	?
Protein binding	7599%
Metabolism	?
Half life	?
Excretion	?
Therapeutic considerations
Pregnancy cat.	?
Legal status	Schedule III(US)
Routes	?
Y(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.

Pharmacology

Benzphetamine is a sympathomimetic amine, and is classified as an anorectic. The main function of this drug is to reduce appetite, which in turn reduces caloric intake. This drug can cause vivid hallucinations if taken for the wrong purpose.

Although the mechanism of action of the sympathomimetic appetite suppressants in the treatment of obesity is not fully known, these medications have pharmacological effects similar to those of amphetamines. Amphetamine and related sympathomimetic medications (such as benzphetamine) are thought to stimulate the release of norepinephrine and/or dopamine from storage sites in nerve terminals in the lateral hypothalamic feeding center, thereby producing a decrease in appetite. This release is mediated by the binding of benzphetamine to centrally located adrenergic receptors. Tachyphylaxis and tolerance have been demonstrated with all drugs of this class in which these phenomena have been looked for.

Contraindications

Benzphetamine is contraindicated in patients with advanced arteriosclerosis, symptomatic cardiovascular disease, moderate to severe hypertension, hyper-thyroidism, known hypersensitivity or idiosyncrasy to sympathomimetic amines, and glaucoma. Benzphetamine should not be given to patients who are in an agitated state or who have a history of drug abuse.

Controlled substance classification

Benzphetamine is unique in its classification as a Schedule III drug in the United States. (Most members of the amphetamine family are classified in the more highly-regulated Schedule II.) It's notable that benzphetamine is metabolized by the human body into amphetamine and methamphetamine metabolites, making it one of the very few drugs to undergo in vivo conversion to a substance of higher addiction and abuse potential. Benzphetamine itself does not have such a high recreational abuse potential (Schedule III) because any administration route (ingested, insufflated, injected, etc.) would still have a sustained release due to the amount of time it would take the liver to metabolize it into amphetamine and methamphetamine.

References

This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (July 2008)

Recent Didrex Forums  View All  

Didrex Even though I am overweight I wouldn't be classed as obese. Would I still be allowed to get Didrex from a pharmacy without perscription? Or would I have to buy online? Wednesday, 4/16/2008 7:38:17 AM  Post a Reply

Drug Levels In Tests I was unexpectedly drug tested last week. I volunteered because I knew that the only meds I had in my system were prescription only. However, the MRO said that there was an amphetamine level and a meth level. I explained that I take Adderall but he said that the Adderall did not cover Meth and they were two separate readings. If I have not used meth, how can that be possible? Could the lab have made a mistake? Friday, 9/22/2006 6:56:39 AM  1 Reply