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Sarah Morgan
Numan
How long until finasteride takes effect?
Sarah Morgan explains that sildenafil, also known as Viagra, is used to treat erectile dysfunction by blocking an enzyme that normally helps your erection subside.
Transcript
Sildenafil is the active ingredient in Viagra. It acts by blocking the enzyme that normally helps your erection subside. By blocking this enzyme, the blood flow for the penis is increased. This results in a longer lasting, harder erection.