I finished a cycle of Test and Dianabol , and am starting my fourth week of PCT. I am completely unable to get an erection, even after using Cialis. Its been like this for a couple of weeks. Any ideas why this could be? This is my fourth cycle, and the Cialis has always worked fine in the past. I'm fairly concerned at this point... Can low test stop an erection, even with Cialis? I still barely get a semi-erection in the morning, but its gone very fast.