Ambien online research references
Neuropharmacology. 1988 Nov;27(11):1125-30.
Further behavioural evidence for the selective sedative action of zolpidem.
Sanger DJ, Zivkovic B.
Laboratoires d'Etudes et de Recherches Synthelabo (L.E.R.S.), Bagneux, France.
Small doses of benzodiazepines stimulate behavioural output in experimental animals in a variety of situations. Zolpidem, which displaces benzodiazepines from their binding sites, however, has been shown to exert preferential sedative activity. In order to investigate whether small doses of zolpidem would also have stimulant effects, the actions of zolpidem and chlordiazepoxide were compared in three procedures which are sensitive to the behavioural-facilitating effects of benzodiazepines in rats. A small dose of chlordiazepoxide (3.0 mg/kg) increased locomotion in an open field whereas a large dose (30 mg/kg) suppressed this behaviour. Zolpidem (0.3-3.0 mg/kg) only decreased locomotion. The effects of both chlordiazepoxide and zolpidem were antagonised by flumazenil. Chlordiazepoxide (2.5-10 mg/kg) increased the intake of food in rats habituated to a daily feeding schedule but similar doses of zolpidem neither increased nor decreased the intake of food. Rates of punished operant responding were increased by chlordiazepoxide (3.0-30 mg/kg) but zolpidem (1.0-4.0 mg/kg) produced no such anti-punishment effect and suppressed responding at the large dose. These results show that zolpidem does not increase behavioural output in situations which are sensitive to the stimulant effects of benzodiazepines and further emphasize the selective sedative activity of this drug.
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Int J Clin Pharmacol Ther Toxicol. 1988 Sep;26(9):439-43.
Plasma protein binding of zolpidem in liver and renal insufficiency.
Pacifici GM, Viani A, Rizzo G, Carrai M, Ganansia J, Bianchetti G, Morselli PL.
Department of General Pathology, Medical School, University of Pisa, Italy.
Similar degree (65-66%) of binding of zolpidem (0.1 microgram/ml) was found with physiological concentrations of isolated human albumin (40 g/l) or alpha-1-acid glycoprotein (1 g/l). Zolpidem binding was studied in plasma from 6 healthy subjects, 12 patients with renal failure, 12 patients with liver cirrhosis and 12 chronic uremics maintained on hemodialysis as well as in 12 serum samples from the placental cord. The unbound fraction (mean +/- s.e.m.) was 8.1 +/- 0.2% (healthy volunteers), 10.8 +/- 0.4% (renal failure), 11.3 +/- 0.7% (liver cirrhosis); 14.9 +/- 1.0% (before hemodialysis); 9.8 +/- 0.4% (after hemodialysis) and 13.2 +/- 0.9% (placental cord). All values, except those after hemodialysis, were significantly different (Dunnett's test) from those of the volunteers. Hemodialysis significantly increased the binding of zolpidem in plasma. The kinetics of protein binding of zolpidem were investigated in plasma samples from 3 healthy subjects. The average number of binding sites was 1.83 x 10(-7) mol per gram protein and the average association constant was 4.49 x 10(5) M-1.
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Int J Clin Pharmacol Res. 1988;8(6):471-6.
Lack of interaction between zolpidem and H2 antagonists, cimetidine and ranitidine.
Hulhoven R, Desager JP, Harvengt C, Hermann P, Guillet P, Thiercelin JF.
Laboratoire de Pharmacotherapie, Universite Catholique de Louvain, Brussels, Belgium.
Zolpidem is a new imidazopyridine derivative acting as a hypnotic which may be prescribed with H2 receptor antagonists in patients with peptic ulcer. A cross-over study (cimetidine, 1 g daily for 19 days; ranitidine, 300 mg daily for 19 days; wash-out period: 20 days) was carried out in six healthy volunteers. Zolpidem, 20 mg was administered orally at 09h00 prior to any treatment and on days 2 and 17 of each treatment period. Antipyrine clearance was also determined before and on day 18 of each treatment period. Under these experimental conditions, the inhibitory effect of cimetidine on the Cyt P-450 mono-oxygenase system has been demonstrated (reduced clearance of antipyrine, p less than 0.01) but the pharmacokinetics of zolpidem did not appear to be modified. Zolpidem induced hypnotic effects for the first 3 h which tend to be prolonged by the combination with cimetidine. Psychometric and pharmacokinetic evaluations did not show significant interactions with either anti-H2 receptor agent following zolpidem administration.
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Biomed Environ Mass Spectrom. 1988 Feb 15;15(4):223-8.
Thermospray liquid chromatography tandem mass spectrometry: application to the elucidation of zolpidem metabolism.
Vajta S, Thenot JP, de Maack F, Devant G, Lesieur M.
Laboratoires d'Etudes et de Recherches Synthelabo, Paris, France.
This paper discusses the possible advantages of thermospray liquid chromatography/tandem mass spectrometry LC/MS/MS for metabolic mapping. The technique was applied to the study of the metabolism of zolpidem, a new hypnotic with an imidazo-pyridine moiety. When compared to other chromatographic/mass spectrometric-based techniques, reversed phase high-performance liquid chromatography coupled with thermospray LC/MS/MS appears to be the fastest method available today for elucidation of unknown metabolic structures, since it allows identification by direct injection of concentrated urine. However, it was noted during the thermospray process that loss of formaldehyde from a hydroxymethyl amide metabolite occurred. This degradation was not observed when this metabolite was analysed by gas chromatography/mass spectrometry following trimethylsilylation.
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Pharmacol Biochem Behav. 1988 Apr;29(4):827-9.
Variations of cyclic alternating pattern rate and homeostasis of sleep organization: a controlled study on the effects of white noise and zolpidem.
Terzano MG, Parrino L, Fioriti G, Farolfi A, Spaggiari MC, Anelli S, Arcelloni T.
Sleep Disorders Centre, Department of Neurology, University of Parma, Italy.
The Cyclic Alternating Pattern (CAP) is a physiologic structure of normal non-REM (NREM) sleep, functionally correlated to long-lasting arousal instability. In 12 healthy volunteers, a continuous 45 dB (A) white noise induced no remarkable changes on the standard sleep parameters. However, compared to the baseline conditions, the acoustic perturbation determined a significant increase of the Cyclic Alternating Pattern Rate (CAPR), that measures the amount of CAP during sleep. Ten mg of zolpidem, a novel imidazopyridine hypnotic compound, did not modify the structure of unperturbed sleep, but induced a highly significant reduction of the increased values of CAP Rate due to white noise. The homeostatic function of CAP is stressed. CAPR appears to be a highly sensitive indicator of environmental modification during sleep.
online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=3413207&dopt=Abstract
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