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Viagra, Revatio
PDE5 inhibitor • Phosphodiesterase-5 inhibitor
Inhibits PDE5, increasing cGMP and causing smooth muscle relaxation
Drug Class
PDE5 inhibitor
Subclass
Phosphodiesterase-5 inhibitor
Half-life
3-5 hours
Time for plasma concentration to decrease by 50%
Protein Binding
96%
Fraction bound to plasma proteins
Therapeutic Index
Wide
Margin between therapeutic and toxic doses