Never heard of Pro Viagra as such. If you mean to say generic Viagra,then
1] Both
generic and brand
비아그라약효 Viagra gives same effect, both differ in price. Generic Viagra is cheap while brand is costly.
2] You require prescription for brand Viagra while generic doesn't require prescription.3]
Generic Viagra has more chance of showing side effect, while brand has less because you acquire Viagra prescription once doctor
비아그라약효 recommend you based on your health for brand
비아그라약효 Viagra.