As the OP said - it's the "silent killer" with no symptoms whatsoever
I was prescribed Ramapril years ago, but never bothered taking them - well, once in a Blue Moon (no pun intended)
Last year, I had pains, sweats, pins & needles and generally felt rough, the doctor sent me to A&E straight away as they thought I could be having a stroke (luckily I wasn't)
A&E were very good, very thorough to be fair and done all sorts of tests........then I saw a stroke specialist who asked me if I was on any medication and I told him I was on Ramapril, but didn't bother taking them [properly]
His personna changed completely and he gave me a proper ticking off stating one of his pet hates is people who are prescribed medication and never bother taking them - the medication is prescribed for a reason.
Since then, I've taken my tablets daily, ( don't want a sr=troke, I don't want brain damage and I like my eyesight!!
Truly is the silent killer