Cialis: Is one right for you? Viagra generally only stays in your system for four to six hours. Self medicating is kinda like working on your car; If you screw it up you can ruin the engine. Summary Cialis and Viagra are both pills for treating erectile dysfunction. In addition, ED is extremely common.Generic Viagra (sildenafil) is available as a , , , and milligram (mg) pill and in liquid form. It’s meant to be taken as needed — about an hour before sex — but shouldn’t be. Answer 1 of 9: I’ll be travelling to Punta Cana in the next few weeks and due to the fact I’m a little older, I do take viagra (50mg). It’s prescription (generic brand of Apotomax or . I’ll be travelling to Punta Cana in the next few weeks and due to the fact I’m a little older, I do take viagra (50mg). It’s prescription (generic brand of Apotomax or something like that), in boxes of 4, with a label on each box. My name, the pharmacy name, and phone number are on each label, and the 4 pills are in blister packs.