Only telling you my experience. I take Lisinopril 20mg per day (since many years). Originally my free testosterone was low, but after started TRT skyrocket. At least on me it doesn´t have that effect (lowering Free Test). Same happened when I stoped Testosterone injections and had only HCG + Clomid (I lowered it a bit without T but still was very high). Now I´m just on Clomid, but my lab results are going to be next month (I feel the same, expect to have high TT and high Free T, but this last sentence is just a conjecture).
Oh, by the way, I came to a point the Lisinopril would not lower enough the High Preasure. Accidentally I started swimming (just because I can not lift weights), and reduced my presure making it not only normal but great, 11/7 always! (it took about a month or two of swimming to get there).