04/20/2026
I am a cardiologist. I have written the Lisinopril prescription thousands of times. I have written it for men whose fathers I also put on it. I have watched it control numbers for decades. Three years ago I found something that made me pause before writing it for the first time in my career. Here is what I found — and what I now tell patients before that prescription becomes the only conversation left.
My name is Dr. Michael Harrison. I have been a cardiologist for 31 years.
I am writing this because something has changed in how I practice. And I believe the men sitting in waiting rooms — and the men who have been told that their numbers are getting into concerning territory — deserve to know what I found.
Let me start with what we know.
When a patient comes in with blood pressure consistently above 140/90, the standard of care is medication. ACE inhibitors. Calcium channel blockers. Beta blockers. These are the tools I was trained to use, the tools I have used for three decades, and they do exactly what they are designed to do.
They lower the number.
What they do not do — what no blood pressure medication was ever designed to do — is fix the underlying biological problem that is raising the number in the first place.
That problem is called endothelial dysfunction.
The endothelium is the inner lining of your blood vessels. When those cells are healthy, they produce a molecule called nitric oxide. Nitric oxide is what keeps your arteries relaxed, elastic, and open. Blood moves through freely. Pressure stays in a healthy range.
As men age, the endothelium deteriorates. Nitric oxide production declines. The arteries stiffen. They lose their elasticity. Blood has to push harder to move through vessels that no longer accommodate it the way they once did.
That is why blood pressure rises in men over 50 who are doing everything right. Not overweight. Not sedentary. Eating reasonably. Managing stress. And still elevated. Because the problem is not their lifestyle.