heart failure
"My 89-year old father was taking this med for a few weeks. He was weak (we had to pull him out of bed or out of his chair, he walked with a walker, was confused, just totally not him. He happened to have a urinary infection about the same time so we blamed that.

Finally, a week later, infection gone -- and was still so weak. Hospitalized one day, many tests, and nothing found. 

Started to take half the dose of Entresto, per his cardiologist (we asked since that was the only thing different at this point)... in five days, back to normal. No walker, no need to help him get up, alert and living again!

P.S. His primary care doctor said he doesn't prescribe Entresto... its two powerful drugs. He isn't the cardio guy, but... beware!"