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Selected Publication:
Stoschitzky, K; Koshucharova, G; Lercher, P; Maier, R; Sakotnik, A; Klein, W; Liebmann, PM; Lindner, W.
Stereoselective effects of (R)- and (S)-carvedilol in humans.
Chirality. 2001; 13(7):342-346
Doi: 10.1002/chir.1042
Web of Science
PubMed
FullText
FullText_MUG
- Leading authors Med Uni Graz
- Stoschitzky Kurt
- Co-authors Med Uni Graz
- Amegah-Sakotnik Andrea
- Lercher Peter
- Liebmann-Holzmann Peter
- Maier Robert
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- Abstract:
- Carvedilol is currently used as the racemic mixture, (R,S)-carvedilol, consisting of equal amounts of (R)-carvedilol, an alpha-blocker, and (S)-carvedilol, an alpha- and beta-blocker, which have never been tested in their optically pure forms in human subjects. We performed a randomized, double-blind, placebo-controlled, crossover study in 12 healthy male volunteers. Subjects received single oral doses of 25 mg (R,S)-carvedilol, 12.5 mg (R)-carvedilol, 12.5 mg (S)-carvedilol, and placebo at 8 AM as well as at 8 PM. Exercise was performed at 11 AM, and heart rate and blood pressure were measured at rest and after 10 min of exercise. Urine was collected between 10 AM and 6 PM, as well as between 10 PM and 6 AM, and the amounts of urinary 6-hydroxy-melatonin sulfate (aMT6s) were determined by RIA. Compared to placebo, (R)-carvedilol increased heart rate during exercise (+4%, P < 0.05) and recovery (+10%, P < 0.05); (S)-carvedilol decreased heart rate during exercise (-14%, P < 0.05) and recovery (-6%, P < 0.05), and systolic blood pressure during exercise (-12%, P < 0.05); (R,S)-carvedilol decreased heart rate during exercise (-11%, P < 0.05), and systolic blood pressure at rest (-7%, P < 0.05) and during exercise (-10%, P < 0.05). None of the agents had any significant effect on the release of aMT6s. Our results indicate that only (S)-carvedilol causes beta-blockade, whereas (R)-carvedilol appears to increase sympathetic tone, presumably as a physiological reaction to the decrease of blood pressure caused by alpha-blockade. None of the drugs had any influence on melatonin release. The weak clinical net effect of beta-blockade of (R,S)-carvedilol at rest might be one reason why this drug causes fewer side effects than other beta-blockers, such as a reduction of nocturnal melatonin release.
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- Administration, Oral -
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- Cross-Over Studies - pharmacology
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- Find related publications in this database (Keywords)
- beta-blockers
- alpha-blockers
- heart rate
- melatonin
- chirality