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  • 1
    ISSN: 1432-2072
    Keywords: Fenfluramine ; Norfenfluramine ; Anorexia ; Activity Analysis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The anorexic and behavioural effects of Norfenfluramine were studied in rats. Two separate experiments were conducted involving administration by intra-peritoneal and sub-cutaneous routes respectively. Behavioural effects were assessed by time sampling categorisation on Days 1 and 14 of a 20 day chronic study and anorexic effects by daily weighing. Norfenfluramine was found to be a potent anorexiant, to which tolerance is established fairly quickly. It was also found to possess sedative properties after acute administration, but marked stimulant properties after 14 days chronic administration. These results are similar to those previously reported in a study of Fenfluramine, although the behavioural effects of Norfenfluramine are more marked. The results implicate Norfenfluramine in the anorexic and behavioural effects of Fenfluramine, and provide indirect confirmation of the suggestion made in an earlier paper that Fenfluramine may have chronic stimulant properties.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 31 (1973), S. 63-76 
    ISSN: 1432-2072
    Keywords: Fenfluramine ; Anorexia ; Activity Analysis ; C.N.S. Stimulation ; Stereotyped Behaviour
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Two experiments were conducted on the effects of chronic administration of fenfluramine on behaviour and body weight in rats. In Experiment One the effects of 28 day chronic administration were studied. A dose related rapid weight loss was observed in treated subjects, with development of tolerance to the effects of the drug on body weight after 14 days administration. Observations of behaviour were made on days 1, 14 and 28 of chronic administration according to a “time sampling” procedure of behavioural categorisation. The incidence of some behavioural patterns varied significantly between observation days, although observations of control subjects were never significantly different. By the 28th day of administration tolerance to the behavioural effects of the drug had developed, no dose/response eifects being noted in contrast to the results for prior observation days. In Experiment Two confirmation of the development of behavioural tolerance was obtained. Abnormal, “stereotyped” behaviour induced by a very high dose of fenfluramine showed a much lower incidence in subjects that hadr eceived fenfluramine for 30 days than in saline controls. Attention is drawn to the difficulties inherent in describing psychotropic agents as either sedatives or stimulants. It is suggested that although fenfluramine is generally considered to be a sedative, stimulant effects may be observed after chronic administration of anorexic doses. Similarities between the effects of high doses of fenfluramine and amphetamine are described.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1432-2072
    Keywords: SKF 525 A ; Activity Analysis ; Drug Metabolism
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract SKF 525 A was found possess sedative properties in rats at doses of 25 and 50 mg per kg, when injected intraperitoneally. The behavioural effects of the drug were assessed in two ways. Firstly, by “Time Sampling Behavioural Categorisation” of exploratory behaviour; and secondly by activity measurements obtained with an ultrasonic motion recorder. The results clearly demonstrate that SKF 525A has sedative properties in rats at doses which are conventionally used to inhibit metabolism of a wide range of drugs. The implications of these results for the use of SKF 525 A in the study of the actions of psychotropic drugs are discussed.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 35 (1974), S. 1-12 
    ISSN: 1432-2072
    Keywords: Anorexiants ; Activity Analysis ; Time Sampling ; Screening Tests ; Phenylethylamines ; Serotonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A series of eight experiments were conducted on the acute effects of a number of anorexic agents on rat exploratory behaviour, as assessed by a “time sampling” procedure of behavioural categorisation. Compounds studied were of three types. Firstly, some well known anorexiants (Amphetamine, Diethylpropion, Fenfluramine); secondly, a series of fenfluramine derivatives (Norfenfluramine, SE 780, SE 1513 and SKF 1-39728); and thirdly, an indole derivative (U 22-394A). All the compounds except the latter are based upon a phenylethylamine configuration. The results indicate that amphetamine and diethylpropion are stimulants whilst fenfluramine is a sedative, in accord with the clinical reports of the effects of acute administration of these compounds. All the other phenylethylamines and U 22-394A were found to be sedatives. The technique of activity analysis described here is a useful screening test for psychotropic agents which affect C.N.S. excitability in humans, which is probably superior to other measures of activity in its predictive value. However, it is noted that the effects of acute administration do not always provide a reliable index of chronic effects. The compounds SE 780 and SKF 1-39728 would seem to merit further study. It is suggested that all the fenfluramine derivatives, except SKF 1-39728, have a similar mode of anorexic action to U 22-394A.
    Type of Medium: Electronic Resource
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