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Drugs online research references

Brain Res. 2003 Aug 1;980(1):117-20.
Evidence for an antihyperalgesic effect of venlafaxine in vincristine-induced neuropathy in rat.

Marchand F, Alloui A, Pelissier T, Hernandez A, Authier N, Alvarez P, Eschalier A, Ardid D.

Laboratoire de Pharmacologie Medicale, Faculte de Medecine, E 9904 INSERM/UdA, 63001 Clermont-Ferrand Cedex 1, France.

Venlafaxine, a new antidepressant with fewer side effects, could be of interest to reduce neuropathic pain following antineoplasic drug treatment. In the present study, we demonstrated that venlafaxine inhibits hyperalgesia in a new rat model of neuropathy induced by the antineoplasic drug vincristine, and exerts its effect preferentially via supraspinal and spinal mechanisms.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12865165&dopt=Abstract

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Pol J Pharmacol. 2002 Nov-Dec;54(6):605-13.
Role of neuropeptides in antidepressant and memory improving effects of venlafaxine.

Nowakowska E, Kus K, Bobkiewicz-Kozlowska T, Hertmanowska H.

Department of Pharmacology, Karol Marcinkowski University of Medical Sciences, Rokietnicka 5A, PL 60-806 Poznan, Poland.

The aim of this study has been to investigate the effects of vasopressin and oxytocin on antidepressive and memory improving effects of venlafaxine. Male Wistar rats weighing 180-200 g were used in the study. Venlafaxine (20 mg/kg) was administered po 30 min before the test once, and for 7 and 14 days in the chronic experiments. Oxytocin (1 microg/kg) ip and vasopressin (1 microg/kg) sc were administered only once on the test day, 60 min before the tests. The animals were subjected to Porsolt's test for testing antidepressant activity, and their memory functions (working and spatial memory) were evaluated in the maze test and Morris Water Maze test. Antidepressant effects of venlafaxine could be observed already after single drug administration and the effect was maintained during 7 days of drug administration. Oxytocin also exhibited antidepressant activity, and concurrent administration of venlafaxine and oxytocin helped to maintain antidepressant activity of venlafaxine. Vasopressin was devoid of antidepressant action, yet concurrent administration of vasopressin and venlafaxine did not suppress antidepressant activity of the latter. In the chronic experiment, there was no shortening of passive swimming time. Venlafaxine improved memory in the labyrinth test and in the spatial memory test, whereas oxytocin did not affect memory of the tested animals. Joint administration of venlafaxine and oxytocin did not produce memory improving effect observed after administration of venlafaxine only. Vasopressin improved memory and joint administration of venlafaxine and vasopressin maintained the memory improving effect induced by vasopressin. The regulatory role of neuropeptides and new antidepressant drugs, e.g. venlafaxine in mood status and memory functions may depend on the interactions between monoaminergic and neuropeptidergic systems.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=12866715&dopt=Abstract

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Psychopharmacology (Berl). 1997 Apr;130(3):261-8.
Inhibition of 5-HT cell firing in the DRN by non-selective 5-HT reuptake inhibitors: studies on the role of 5-HT1A autoreceptors and noradrenergic mechanisms.

Gartside SE, Umbers V, Sharp T.

University of Oxford, Department of Clinical Pharmacology, Radcliffe Infirmary, UK.

Improved clinical antidepressant efficacy may result if the acute inhibition of 5-HT cell firing induced by antidepressants is prevented. Here we examined whether inhibition of 5-HT cell firing by non-selective 5-HT uptake inhibiting antidepressant drugs is reversed by a selective 5-HT1A receptor antagonist. In addition, we examined whether concomitant blockade of NA uptake offsets the inhibition of 5-HT cell firing resulting from 5-HT uptake blockade. Antidepressants which block 5-HT uptake (paroxetine, clomipramine, amitriptyline, venlafaxine), all caused dose-dependent and complete inhibition of 5-HT cell firing. Desipramine, a selective NA uptake blocker, caused a slight reduction in firing. The selective 5-HT1A receptor antagonist, WAY 100635, reversed the inhibition of 5-HT cell firing induced by clomipramine, amitriptyline, venlafaxine, and paroxetine, but not that induced by the alpha 1 adrenoceptor antagonist, prazosin. Desipramine, at a dose which increased extracellular NA in the DRN, reversed the effect of prazosin but did not alter the ability of paroxetine to inhibit 5-HT cell firing. Our data indicate that antidepressant drugs with 5-HT uptake blocking properties inhibit 5-HT cell firing via activation of 5-HT1A autoreceptors, and do so irrespective of their effects on NA uptake. These data are discussed in relation to the application of 5-HT1A receptor antagonists to enhance the clinical efficacy of antidepressant drugs.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=9151361&dopt=Abstract

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