Cialis usually works for me. I have been taking it for years at 10 to 20mg ed. I also have really low test. 2 weeks ago I tested at 55ng/dl total. I am dead down there. No blood flow. No fullness. Pathetic erections. Will cialis only work with normal healthy levels of testosterone? Or can the cialis make things work with test bottomed out?. I have had low t for the past few months and things were ok taking cialis but this just started happening. Does cialis eventually stop working or you gain a tolerance to it?