No abstract available
MeSH terms
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3',5'-Cyclic-AMP Phosphodiesterases / antagonists & inhibitors*
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Administration, Oral
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Electroretinography
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Erectile Dysfunction / drug therapy*
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Humans
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Isoenzymes / antagonists & inhibitors
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Male
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Piperazines / adverse effects*
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Purines
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Retina / drug effects*
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Retina / enzymology
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Retina / physiopathology
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Sildenafil Citrate
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Sulfones
Substances
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Isoenzymes
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Piperazines
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Purines
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Sulfones
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Sildenafil Citrate
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3',5'-Cyclic-AMP Phosphodiesterases