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Sildenafil Citrate, the primary active ingredient in Vigora 100 mg, is a member of the Phosphodiesterase type 5 (PDE5) inhibitors pharmacological class. By increasing blood flow to the penis, sildenafil helps cure erectile dysfunction, preventing impotence and assisting in achieving an erection. Vigora 100 mg helps men achieve or maintain an erection and is an effective treatment for erectile dysfunction (ED). The primary component of the drug, sildenafil, inhibits the PDE5 enzyme, which breaks down cyclic guanosine monophosphate (cGMP). A powerful and firm erection for a fulfilling sexual encounter is the result of cGMP's ability to relax blood vessels and increase blood flow to the penile area.