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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 53 (1977), S. 97-102 
    ISSN: 1432-2072
    Keywords: Fenfluramine ; Norfenfluramine ; Amphetamine ; Drug discrimination ; Stimulus properties of drugs ; Fixed ratio responding
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Fenfluramine at a dose of 3.0 mg/kg was found to possess discriminative stimulus properties controlling lever selection by rats in a two-lever operant task. Subjects trained to discriminate the ‘Fenfluramine cue’ failed to generalize to amphetamine in extinction tests at doses between 0.25 and 1.0 mg/kg. Subjects did, however, generalize to the fenfluramine metabolite, norfenfluramine, at a dose of 2.0 mg/kg. These data provide further evidence for a pharmacological difference between fenfluramine and amphetamine, and support the hypothesis that norfenfluramine is an active metabolite of fenfluramine. The relevance of these findings to theoretical and methodological aspects of drug discrimination studies is considered.
    Type of Medium: Electronic Resource
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  • 2
    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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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 35 (1974), S. 13-17 
    ISSN: 1432-2072
    Keywords: Anorexia ; Time Sampling ; Fenfluramine ; SE 780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The behavioural and anorexic effects of the fenfluramine derivative “SE 780” in rats were studied after chronic administration over 35 days. Behavioural effects of the compound were assessed by “time sampling” behavioural categorisation, on days 1, 14 and 28 of administration. An initial sedative effect observed after acute administration was absent on days 14 and 28 of observation, when the drug had no behavioural effects at all. The anorexic properties of the drug were investigated in two ways. Firstly, by measuring daily body weights; and secondly by measuring intake of food over a 2 h period on observation days. The drug appeared to be a highly potent anorexiant in that tolerance to its effects built up very slowly. It is suggested that SE 780 may be an anorexic agent which is superior to Fenfluramine in two ways; firstly, it lacks stimulant properties after chronic administration, and secondly it is active over longer periods of time; as such it merits further study in humans.
    Type of Medium: Electronic Resource
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