Treating Post-Finasteride sexual dysfunction with Viagra

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Taking Viagra has given me some of my old erection back, and it's done so for longer than the 4 hours it's supposed to be in my system.

I took Viagra about a week ago and it seems that some of the blood flow that I wasn't getting to my penis due to Finasteride treatment has been restored. Anyone had any similar experiences with this drug? I was told that Viagra would not improve my libido, but it has.