Anyone had long term success with Viagra / Cialis?

Hi guys. Has anyone here had long term success with PDE5 inhibitors? What I mean by this is has somebody here taken viagra / cialis regularly over a long period of time and found that they have improved their endothelial function?
I recently took some generic cialis before bed and it worked amazingly. The effects lasted 3-4 days and that whole week my erections were noticeably better, even after the cialis had worn off. I’m unsure whether I should be taking cialis consistently, say 1-2 times per week to try replicate this success or would it be better to just save it for when I’m going to have sex in order to prevent tolerance. Any advice is appreciated.
Also huge thanks to Mesolimbo because cialis had stopped working for me for a long time, but I read something he wrote about l-arginine and l-citrulline so I have been taking both those supplements every day for the last few weeks and when I tried the cialis it finally worked again.
I recently took some generic cialis before bed and it worked amazingly. The effects lasted 3-4 days and that whole week my erections were noticeably better, even after the cialis had worn off. I’m unsure whether I should be taking cialis consistently, say 1-2 times per week to try replicate this success or would it be better to just save it for when I’m going to have sex in order to prevent tolerance. Any advice is appreciated.
Also huge thanks to Mesolimbo because cialis had stopped working for me for a long time, but I read something he wrote about l-arginine and l-citrulline so I have been taking both those supplements every day for the last few weeks and when I tried the cialis it finally worked again.