I had surgery in September 2019. I was put on Viagra after the catheter was removed. I take it every morning like a vitamin. That gives me a 4-hour window for activity. If I go past that, I have taken a second pill. They take about 45 minutes to kick in. I don't think I'd have much success without them and at 30 cents a pill, how could I go wrong? It was explained to me, if you don't use it, you'll lose it. I also bought a penis-extending device for $500 to maintain length during the healing process.