Effects of Silvitra 
 
Sildenafil and vardenafil, the main ingredients in Silvitra, work by suppressing PDE-5 (phosphodiesterase type 5), an enzyme that inhibits erections. 
 
An enzyme called PDE-5 breaks down cyclic guanosine monophosphate, which is necessary for erection. 
 
When cyclic guanosine monophosphate is degraded, an erection cannot occur, a condition known as ED (erectile dysfunction). 
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