Here in Brazil Uprima is currently being sold, no Rx required.
Uprima (apomorphine) has a completely different mechanism of action comparated to viagra(sildenaphil).
In short words, Uprima get person "relaxed"(downs adrenaline action whitch is vasoconstrictive on the penis) to easier get an erection.
I took once a 80mg pill and the only thing i felt was a strong nauseous reaction about 15 minutes i swallow the pill. I remained nauseaous for 30 minutes , luckly i had metoclopramide pills and got one.
In my experience Viagra much much much effective.
Can´t wait to try Cialis, still not avaliable here.