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  • Antihypertensive therapy  (1)
  • anticholinergic effects  (1)
  • 1
    ISSN: 1432-1041
    Keywords: Antihypertensive therapy ; alpha adrenoceptor blockade
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary Indoramin, a new antihypertensive drug shown to have cardioinhibitory and alpha adrenoceptor blocking activity in animals, was administered to patients with benign essential hypertension. Single oral doses between 0.1 and 1.0 mg/kg produced dose dependent falls in diastolic arterial pressure without increasing the heart rate. The arterial pressure response to intravenous noradrenaline was diminished in patients taking indoramin, but the response to intravenous angiotensin II and heart rate responses to intravenous isoprenaline were unaltered. Double blind cross-over comparison of indoramin with placebo in 8 patients on continuous oral therapy at maximally tolerated doses, 60–150 mg daily, showed that indoramin significantly lowered diastolic arterial pressure, but that the falls were modest, 7.6 mm Hg lying, 7.1 mm Hg standing and 9.3 mm Hg after exercise. The dose limiting side effect was sedation.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1041
    Keywords: trazodone ; imipramine ; anticholinergic effects ; ECG ; antidepressants
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Medicine
    Notes: Summary The electrocardiographic and anticholinergic effects of trazodone (150 mg) and imipramine (75 mg) were investigated in 8 healthy volunteers. Both agents increased the QTc interval and decreased T wave height, but the effects occurred earlier with trazodone (from 30 min onwards) than with imipramine (150 and 180 min after dosing). Both drugs decreased heart rate, imipramine at 30 and 60 min and trazodone at 90 min. After 120 min, heart rate began to increase with imipramine an effect which was not seen with trazodone. Salivary volume was significantly decreased by imipramine at 120 and 180 min whereas trazodone did not influence salivary volume. Plasma levels of trazodone and imipramine were significantly related to the decrease in T wave amplitude. The increase in QTc interval correlated significantly with the plasma level of imipramine. These results suggest that trazodone, like the tricyclic antidepressants prolongs ventricular repolarization; but, in contrast to imipramine, it does not have anticholinergic activity.
    Type of Medium: Electronic Resource
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