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After examining 2,000 penises, I have to warn every diabetic man about Viagra.

For 14 years I prescribed it without knowing what it was hiding inside these men. What I finally saw on the scans, every diabetic on Viagra needs to see before his next dose.

Dr. Sarah Millary, MD
Dr. Sarah Millary, MD
Board Certified Urologist · 14 years
13 August 2026 · 3 min read
Diabetic man reviewing glucose reading and rising 25 mg to 100 mg dose notes before sunrise

I've examined over 2,000 penises. I'm a urologist, it's my job. And I found something all diabetic men should know before taking another dose of Viagra. None of their doctors are telling them.

Let me explain.

For 14 years, I've treated men for erectile dysfunction. Diabetics get it worse than anyone. Younger, faster, and far harder to treat.

I've seen every stage. The early anxiety. The relief when it works.

Then the slow decline.

Every one of them follows the same path.

25mg works great.

Then 50mg.

Then 100mg.

Then even the maximum dose starts failing.

I've watched this pattern over 2,000 times. Not a single exception.

For years, I said what every urologist says: "You're building tolerance."

But that never made sense to me.

Blood pressure meds don't require higher doses every year. Cholesterol drugs don't slowly stop working. Nothing else in medicine follows this pattern.

So why does Viagra, and why so much worse in diabetics?

Three years ago, I started looking closer.

Not just at function. At structure. Arteries. Blood flow mechanics. What's physically happening inside these men.

That's when I found it.

The thing other doctors never look for.

Your arteries are swollen shut.

Every time your blood sugar spikes, it releases tiny, sharp particles into your bloodstream, and those particles scratch the inside of your artery walls.

By 40, most men have arteries that look decades older than they are. Severely swollen and inflamed.

Now, the arteries that give you an erection are only one to two millimetres wide. The smallest in your body, by a long way.

So they are the first to swell. And they stay swollen shut, day and night.

But here is the part that catches most men off guard. Even if you get your sugar under control, that damage is already done. So your arteries look the same whether your last A1C was 9 or 5.

Diabetic man in a parked car studying improved A1C result beside a dose-change refill slip

But that's not the part that made me start warning men.

The same process happening in those one-to-two-millimetre arteries is happening everywhere else too. It just shows up there first because they're the smallest. The larger arteries are further behind, but they're on the same track. The failing erections aren't the problem. They're the warning.

And Viagra is turning that warning off.

Small inflamed vessel narrowed by chronic diabetic swelling, with larger arteries faintly visible behind it

Because Viagra doesn't bring the swelling down.

It forces blood through an artery that's already closing.

That's why it works at first, when the swelling is minor.

But the swelling keeps building while Viagra masks it.

That's why you need higher doses.

That's why it eventually fails completely.

You're not building tolerance.
You're swelling shut from the inside. And every month on Viagra, you lose the one signal your body was giving you that something severe is happening underneath.

I've seen it now in over 2,000 men. The scans are nearly identical. Arteries swollen. Passages narrowed to almost nothing. Blood struggling to get through.

And Viagra hiding all of it while it gets worse.

Once I understood this, I couldn't keep prescribing the same way.

I couldn't watch another diabetic man's erection problems quietly turn into a phone call his wife would never forget, because I gave him a mask instead of a fix.

Dr. Sarah Millary warning a diabetic patient during vascular scan review

So I went looking for something that addresses the actual problem.

Not force blood past the swelling. Stop the damage, bring the swelling down, and open the artery. In that order.

Here's what the research pointed to.

CoQ10 clears out the particles doing the scratching, so the damage finally stops.

Curcumin, the active compound in turmeric, brings the inflammation down, so a swollen artery can open again.

And L-Citrulline restores nitric oxide, the molecule that tells a calm artery to widen when you're aroused.

And the order is everything. You cannot open an artery that is still being scratched and still swollen.

That is why every blood flow supplement you may have tried did nothing. Beets. Arginine. Citrulline on its own. Nitric oxide boosters. Every single one of them is a last-step product used on a first-step problem.

I found a formula that combined all three at clinical doses.

I started recommending it to the diabetic men Viagra was failing.

The results confirmed what I suspected:

One patient, 52, Type 2 diabetic for 11 years, maximum dose Viagra barely working, came back after 8 weeks. He'd thrown his pills away. Didn't need them anymore. His wife asked what changed. He didn't try to explain swollen arteries. He just showed her. Twice that night.

Another patient, 49, pre-diabetic, called my office at 7am. First morning erection in four years. "I forgot this was possible," he said.

A 55-year-old Type 2 diabetic cancelled his penile implant consultation. His body worked on its own again.

Man leaving an early-morning relieved voicemail for his doctor from his kitchen

I've examined over 2,000 penises.

I've seen what's inside diabetic men specifically.

The swelling. The narrowing. The slow closing of the smallest arteries in your body, while Viagra hides it.

If you're diabetic and your doses are climbing...

If Viagra is failing faster than it should and you don't know why...

If your doctor says "tolerance" but it doesn't make sense...

He's wrong. You're diabetic, and your arteries are swelling shut. And every month on Viagra, it gets worse underneath, and you lose more of the warning you were being given.

This is fixable. Not by forcing harder. By stopping the damage, bringing the swelling down, and opening the artery, in that order.

I'll link below what I recommend to my diabetic patients now. 60-day guarantee, enough time to see it working.

Your doctor hasn't found what I found.

But now you know.

~ Dr. Sarah Millary, MD Board Certified Urologist, 14 years

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