Vasorelaxant and hypotensive effects of trazodone in Guinea pig
2005
Kim, S.J. (Chonbuk National University, Jeonju, Republic of Korea) | Kang, H.S. (Chonbuk National University, Jeonju, Republic of Korea) | Kim, J.S. (Chonbuk National University, Jeonju, Republic of Korea), E-mail: kimjs@chonbuk.ac.kr
We studied the effects of trazodone on arterial blood pressure in anesthesized guinea pigs, and on vascular responses in isolated thoracic aorta. Trazodone produced a concentration-dependent relaxation in phenylephrine-precontracted endothelium intact (+E) rings, but not in a KCl-precontracted aortic rings. These relaxant effects of trazodone on +E rings were siginificantly greater than those on denuded (-E) rings. The trazodone-induced relaxation was suppressed by gilbenclamide and tetrabutylammonium, but not by N(G)-nitro-L-arginine (L-NNA), N(omega)-nitro-L-arginine methyl ester (L-NAME), methylene blue (MB), nifedipine, indomethacin, 2-nitro-4-carboxyphenyl-n,n-diphenylcarbamate (NCDC) and clotrimazole. In vivo, infusion of trazodone elicited a significant decrease in arterial blood pressure.
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