What Causes Erectile Dysfunction After Using Tenorice For BP?

If this is free and without obligation then please answer my question. I am 75 yrs of age, healtrhy wighing 72 kgs and haved never taken any medicine except for BP which was detected as 140-150/90 at the time of prescription 5-6 yrs ago i.e Tenorice 25mg. I am a healthy man with tummy tucked. The erection level has gone down considerably and I want to have firm and lasting erection.How. I do not wish to hunt for tablets.