[Efficacy of a new hypnotic zolpidem (Stilnox) in ambulatory practice (Cooperative study by practitioners in Geneva, Lausanne and Tessin)] Determination of zolpidem and zopiclone in serum by capillary column gas chromatography. [Zolpidem. A new non-benzodiazepine hypnotic] Native gamma-aminobutyric acid type A receptors from rat hippocampus, containing both alpha 1 and alpha 5 subunits, exhibit a single benzodiazepine binding site with alpha 5 pharmacological properties. The activity of zolpidem and other hypnotics within the gamma-aminobutyric acid (GABAA) receptor supramolecular complex, as determined by 35S-t-butylbicyclophosphorothionate (35S-TBPS) binding to rat cerebral cortex membranes. Ambien online references

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Rev Med Suisse Romande. 1991 Jan;111(1):85-8.
[Efficacy of a new hypnotic zolpidem (Stilnox) in ambulatory practice (Cooperative study by practitioners in Geneva, Lausanne and Tessin)]

[Article in French]

Calanca A, Dick P.

Clinique psychiatrique universitaire, Prilly.

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J Pharm Sci. 1991 Jan;80(1):71-4.
Determination of zolpidem and zopiclone in serum by capillary column gas chromatography.

Debruyne D, Lacotte J, Hurault de Ligny B, Moulin M.

Laboratory of Pharmacology, Caen University Hospital Center, France.

A gas chromatographic method using a short, high-resolution capillary column connected to a specific thermoionic detector and requiring a simple and short extraction step without evaporation was developed for the rapid and precise determination of two new hypnotics, zolpidem and zopiclone, in serum at concentrations greater than 5 ng/mL. The assay was linear between 5 and 200 ng/mL, with coefficients of intra- and interassay variation less than 5% for both. The method was validated and then used to analyze zolpidem serum concentrations in nine rabbits after oral administration of 0.5 mg/kg and zopiclone serum concentrations in six patients treated orally with a 7.5-g dose.

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Ugeskr Laeger. 1991 Apr 15;153(16):1142-4.
[Zolpidem. A new non-benzodiazepine hypnotic]

[Article in Danish]

Geisler A.

Farmakologisk Institut, Kobenhavns Universitet.

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J Pharmacol Exp Ther. 1999 Sep;290(3):989-97.
Native gamma-aminobutyric acid type A receptors from rat hippocampus, containing both alpha 1 and alpha 5 subunits, exhibit a single benzodiazepine binding site with alpha 5 pharmacological properties.

Araujo F, Ruano D, Vitorica J.

Department of Bioquimica, Bromatologia y Toxicologia, Facultad de Farmacia, Universidad de Sevilla, Sevilla, Spain.

Evidences indicate the existence of two homologous and/or heterologous alpha subunits coassembled in a single gamma-aminobutyric acid type A (GABA(A)) receptor. However, it is unknown whether both or only one of the coassembled alpha subunits display benzodiazepine binding sites. Thus, we have investigated the association between alpha1 and alpha5 subunits and the pharmacological properties of these GABA(A) receptors from rat hippocampus. The association between alpha1 and alpha5 subunits was demonstrated by immunoblot of the anti-alpha1 or -alpha5 immunoaffinity-purified receptors and by double immunopurification by anti-alpha1 and -alpha5 columns in series. The benzodiazepine binding properties of the immunoprecipitated receptors indicated the existence of pharmacologically active and inactive alpha subunits. The anti-alpha5 immunoprecipitated receptors displayed exclusively low-affinity binding sites for both Cl218,872 (K(i) = 0.81 +/- 0.15 microM) and zolpidem (K(i) = 5.0 +/- 3.0 microM), in spite of the association between alpha1 and alpha5 subunits. The anti-alpha1 immunoprecipitated receptors displayed both high- and low-affinity binding sites for both ligands (K(i)s = 47.5 +/- 5.2 nM and 0.7 +/- 0.06 microM for Cl218,872 and 25.0 +/- 7.0 nM, 415 +/- 200 nM and 9. 3 +/- 3.0 microM for zolpidem). Therefore, the alpha5 subunit, when coassembled with alpha1 subunit, should be pharmacologically predominant. This hypothesis was probed by immunoprecipitation of the photoaffinity-labeled receptors and by anti-alpha1 and -alpha5 double immunopurified receptors. The alpha1-alpha5 double immunopurified receptors displayed a single low-affinity binding site (K(i) = 908 +/- 105 nM) for Cl218,872, undetectable [(3)H]zolpidem binding activity, and similar [(3)H]flumazenil and [(3)H]L-655,708 binding activity (0.10 +/- 0.01 and 0.09 +/- 0.02 pmol/20 microliters of anti-alpha5 immunobeads, respectively). Thus, the native GABA(A) receptors containing alpha1 and alpha5 subunits have only one alpha subunit pharmacologically active displaying alpha5 binding properties.

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J Pharmacol Exp Ther. 1990 Nov;255(2):690-6.
The activity of zolpidem and other hypnotics within the gamma-aminobutyric acid (GABAA) receptor supramolecular complex, as determined by 35S-t-butylbicyclophosphorothionate (35S-TBPS) binding to rat cerebral cortex membranes.

Lloyd GK, Danielou G, Thuret F.

Synthelabo Recherche (L.E.R.S.), Bagneux, France.

The present study compares the effects of different hypnotics acting at omega 1/omega 2 sites (zolpidem, zopiclone, flunitrazepam and triazolam) on 35S-t-butylbicyclophosphorothionate (35S-TBPS) binding to well-washed rat cerebral membranes, in the presence of 1M NaCl. Under these conditions, all compounds enhanced 35S-TBPS binding in the 0.05 to 10 microM range with EC50 values and maximal enhancement of: zolpidem, 84 nM and 36%; flunitrazepam, 8 nM and 41%; zopiclone, 171 nM and 51%; triazolam, 2 nM and 42%. Under these conditions, gamma-aminobutyric acid enhanced 35S-TBPS binding with an EC50 of 240 nM and a 38% maximal increase. The EC50 values for the stimulation of 35S-TBPS binding are well correlated, with (r = 0.97) the affinity of these compounds at omega 1/omega 2 sites, and are in the same concentration range. This enhanced binding was due to an altered apparent affinity for the 35S-TBPS recognition site without any change in the number of sites (Scatchard analysis). The effect of zolpidem and other hypnotics was antagonized by flumazenil. This was an apparently competitive antagonism in the case of zolpidem or flunitrazepam, whereas for zopiclone, increasing the concentration of the hypnotic did not overcome the antagonism. Bicuculline only partially antagonized the hypnotic-induced enhancement of 35S-TBPS binding. This antagonism was more effective for zopiclone (-57%) than for either zolpidem (-33%) or flunitrazepam (-30%). Zolpidem and the other hypnotics studied induced a fast component of dissociation which was not observed in the control membranes. These findings are consistent with the hypothesis that omega 1/omega 2 agonists increase the frequency of openings of the chloride ionophore, with both gamma-aminobutyric acid-A receptor-dependent and -independent mechanisms.

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