No abstract available
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Drug Interactions
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Humans
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Nitric Oxide / metabolism
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Phosphodiesterase Inhibitors / pharmacology*
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Piperazines / pharmacology*
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Purines
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Sildenafil Citrate
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Sulfones
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Superoxides / metabolism*
Substances
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Phosphodiesterase Inhibitors
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Piperazines
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Purines
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Sulfones
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Superoxides
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Nitric Oxide
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Sildenafil Citrate