var·den·a·fil 
(vär-dĕnə-fĭl)
(vär-dĕnə-fĭl)n.
A drug that inhibits phosphodiesterase, C23H32N6O4S, used in its hydrochloride form to treat erectile dysfunction by increasing the level of cyclic GMP, which increases blood flow to the erectile tissues.
[var-, origin unknown + (SIL)DENAFIL.]
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