I noticed within days that it had an effect on my behavior such...

I noticed within days that it had an effect on my behavior such that I found usual emotional aggravations (like being cut off while driving) suddenly did not bother me. I subsequently found out that lisinopril binds to Testosterone and mine was low to begin with and with the lisinopril effect I had a really low testosterone requiring supplementation. I started taking Lisinopril about a year ago. I have had no cough or joint pain, but fatigue is severe, even if I get enough sleep. Some afternoons I find it almost impossible to stay awake. I will repost some time after stopping it.