No abstract available
Publication types
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Clinical Trial
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Randomized Controlled Trial
MeSH terms
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Adult
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Aged
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Aged, 80 and over
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Double-Blind Method
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Erectile Dysfunction / drug therapy*
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Humans
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Male
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Middle Aged
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Phosphodiesterase Inhibitors / administration & dosage*
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Piperazines / administration & dosage*
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Purines
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Sildenafil Citrate
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Sulfones
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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Sildenafil Citrate