No abstract available
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Adult
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Carbolines
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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 5 Inhibitors / therapeutic use*
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Piperazines / therapeutic use*
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Purines / therapeutic use
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Semen*
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Sildenafil Citrate
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Specimen Handling
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Sulfones / therapeutic use*
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Tadalafil
Substances
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Carbolines
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Phosphodiesterase 5 Inhibitors
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Piperazines
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Purines
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Sulfones
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Tadalafil
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Sildenafil Citrate