... noradrenergic and vasopressinergic systems is tonic in nature by measuring the response of cerebrospinal fluid (CSF) norepinephrine (NE) and arginine vasopressin (AVP) to the α 2 antagonist yohimbine in 7 young normal male human subjects. We also evaluated the tonic nature of α 2 -inhibition of the sympathetic...

... when given one of two α 2 -antagonists (yohimbine or idazoxan). Idazoxan also attenuated lordosis in animals given estrogen plus progesterone. These findings, in combination with previous findings (that specific α 1 -antagonists block lordosis), suggest that α 2 -receptors, in addition to α 1...

... to α-adrenoceptor antagonists and/or morphine were studied by peripheral administration of prazosin, a selective αi-adrenoceptor antagonist, and yohimbine, a selective α 1 -adrenoceptor antagonist, in conscious, unstressed or ether-stressed rats. The test substances were administered intravenously...

... in its beta-1-, beta-2- and alpha-2-agonist actions. However, prenalterol (2 mg) and salbutamol (250 µg), respectively beta-1- and beta-2-adrenergic agonist drugs, had no effect on the secretion of ACTH or cortisol and the alpha-2-antagonist yohimbine in an effective dose did not unmask a stimulant...

... (a muscarinic receptor blocker), apomorphine (a dopamine receptor agonist), haloperidol (a dopamine receptor blocker) and yohimbine (an alpha-2-adrenergic receptor blocker); but was blocked by clonidine (an alpha-2-receptor agonist) and this effect of clonidine was reversed by yohimbine. Diazepam was unable...

...Eric L. Lien; Ann Morrison; Jacob Kassarich; Donald Sullivan The role of the α 2- adrenergic system in regulating prolactin release has been studied in vivo in male rats. Yohimbine administration alone, at doses ranging from 0.2 to 5.0 mg/kg, resulted in a dose-releated elevation of plasma...

... latencies to initiation of copulation, to ejaculation, and to reinstatement of copulation following ejaculation. Additionally, prazosin (1 mg/kg) pretreatment failed to attenuate or prevent the clonidine-induced suppression of ejaculation. In contrast, yohimbine, a drug which preferentially blocks α 2...

...Peter Tatár; Milan Vigaš The effects of intravenous infusion of the nonselective alpha-adrenergic antagonist phentolamine or of the selective alpha2-adrenergic antagonist yohimbine on growth hormone (GH), prolactin (PRL) and cortisol secretion during insulin-induced hypoglycemia were studied in 11...

...Michael A. Arnold; John D. Fernstrom We attempted to determine whether release of endogenous somatostatin (SS) in rats might mediate the apparent inhibition of growth hormone (GH) secretion produced by metergoline or yohimbine injection. Plasma GH levels in adult male rats bearing chronic right...