> How does Viagra affect the voice ?
It doesn't; it inhibits an enzyme called phosphodiesterase type 5 found in the genitals and the retina. Other than its effects on blood flow to the penis and the vagina, it can occasionally make a blue color appear in the vision which is harmless and temporary.
John
John J. Messmer, M.D. Assistant Professor, Family & Community Medicine Penn State College of Medicine
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