| 单词 | sildenafil citrate | 
| 释义 | > as lemmassildenafil citrate   A piperazine derivative that acts as a selective inhibitor of cyclic nucleotide (guanosine monophosphate) phosphodiesterase, and is given orally as the citrate (more fully  sildenafil citrate) to improve blood flow into the penis and enhance erectile function; 1-[[3-(6,7-dihydro-1-methyl-7-oxo-3-propyl-1H-pyrazolo[4,3-d]pyrimidin-5-yl)-4-ethoxyphenyl]sulfonyl]-4-methyl-piperazine, C22H30N6O4S.A proprietary name for this drug is Viagra n. ΚΠ 1995    PR Newswire 		(Nexis)	 23 Oct.  				Sildenafil, for male erectile dysfunction (MED), showed a response rate as high as 90 percent in a large clinical trial of patients with a primarily psychologically based condition. 1996    Brit. Jrnl. Urol. 78 257  				Sildenafil, a novel orally active inhibitor of the type-V cyclic guanosine monophosphate-specific phosphodiesterase (the predominant isoenzyme in the human corpus cavernosum). 1999    Irish Med. Jrnl. 		(Electronic ed.)	 92 5  				Sildenafil is absolutely contra-indicated in patients taking nitrates, whether continuous or episodic because of the severe hypotension that may result. < as lemmas | 
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