Here's what most prescribing doctors learn about constipation: figure out the cause, treat the symptom, escalate as needed. Miralax is a frontline tool. It's safe. It's effective. Adjust the dose if needed.

That training is correct for ordinary constipation.

It is dangerously incomplete for GLP-1-induced constipation.

The reason is something called the cephalic phase digestive response — and unless you've taken a graduate-level course in digestive physiology, you almost certainly weren't taught it. Most medical schools spend less than two hours on bile physiology in four years.

Here is what I had to teach myself, paper by paper: Every time you eat — actually, before food even reaches your stomach — your body is supposed to fire a signal cascade. The signal originates with bitterness on your tongue. It travels to your liver. Your liver releases bile into your digestive tract. And that bile coats the walls of your intestines.

That coating is the difference between food sliding through and food stalling.

GLP-1 medications shut this cascade down. Not as a side effect — as part of how they work. They suppress appetite, slow gastric emptying, and dampen the cephalic response. The bitter signal fades. The liver stops getting the trigger. Bile stops releasing. The intestinal walls run dry.

Then we tell patients to take Miralax — which works by pulling water into the colon and forcing an output without ever firing the bile cascade. So we have a medication that suppresses bile release. Stacked with a laxative that completely bypasses bile release. Used together, every single morning, for months.

I cannot believe it took me until 2024 to see what was happening.

The Hidden Mechanism Almost No Prescribing Doctor Knows About

This is what I now call the Cephalic Bypass.

Every day a Zepbound patient takes Miralax, two things happen at once.

First, Miralax produces a result without firing the bile cascade. Second — and this is the part nobody teaches — a digestive pathway that goes unused every day gets quieter from disuse.

Less signal reaching the liver. Less bile in circulation. Drier walls every morning.

The dose doesn't climb because the constipation is getting worse. The dose climbs because the natural pathway being bypassed is fading from disuse.

This is why the curve only moves one way. Why one capful becomes two. Why Magnesium Citrate gets added. Why the relief windows shrink. Why some of my patients arrive on six months of daily osmotic use and tell me they're terrified to stop.

And here's the part that should make every Zepbound patient pay attention: the longer this continues, the more your body forgets how to do it on its own. 

In our specialty we call this cathartic colon — a bowel that has nearly forgotten how to move without external force. Reversing it takes months. Catching it early takes weeks.

You are not crazy. The dose really is climbing for a reason. The reason just isn't on your prescribing doctor's chart.

Why Every Other Approach Fails

I have watched my patients try everything before they get to me.

More water? Helpful for hydration. Doesn't fire bile release. Doesn't address the bypass.

More fiber? Useful for ordinary constipation. In a stalled GLP-1 gut, often makes things worse — bulk without lubrication. Doesn't address the bypass.

Probiotics? Adds bacteria to a stagnant intestine. The bacteria ferment trapped waste. You feel more bloated, not less. Doesn't address the bypass.

 Magnesium Citrate? Same osmotic mechanism as Miralax — pulls water in, forces output, never triggers bile. Doubles down on the bypass.

Cutting dairy or gluten? Documented food triggers for some GLP-1 patients but doesn't address why the pathway has gone quiet in the first place.

Every single one of these is treating downstream symptoms. None of them fire the upstream pathway that's actually shut down.

What I started recommending privately to my patients is something I'd never have considered before 2024 — and something every gastroenterologist I've discussed it with has, after looking at the physiology, agreed with.

The Bitter Trigger That Restarts The Pathway

The cephalic phase fires on one specific input: genuine, intense bitterness hitting the tongue.

Modern food has had almost all bitterness processed out — through crop domestication and food refinement. Most adults haven't tasted real bitterness in years. Coffee and dark chocolate don't qualify. The receptors in question respond to compounds that make you wince.

I started looking for something concentrated enough to break through Zepbound's appetite suppression and reach the liver.

What I found is a botanical extract that has been used as a digestive tonic across the Caribbean for generations: the leaves and roots of the soursop plant.

Not the fruit. The fruit is sweet. The leaves and roots are almost shockingly bitter — bitter enough to fire the cascade even in patients on the highest Zepbound doses.

There is one company making this in a clinically credible form. It's called Verdara. Their drops use a concentrated extract from soursop leaves and roots — the actual bitter parts — without the sweet fruit dilution most "soursop" supplements rely on. A few drops under the tongue or in water. The bitterness hits. The bitter receptors fire. The signal reaches the liver. Bile releases. The intestinal walls finally get coated.

The pathway fires. After months — sometimes years — of being bypassed.

What I See In The First Two Weeks

I now have over 80 patients in my own practice using Verdara alongside their GLP-1 medication. The pattern is consistent enough that I keep a notebook.

Days 2-3: Patients describe a sensation "higher up" than their usual brick. Something upstream loosening. This is the bile cascade firing.

Days 3-7: Most reduce or eliminate Miralax without effort. Movement returns without forcing.

Weeks 2-4: The brick stops returning. Bloating eases. Energy returns. Most stop the Magnesium Citrate entirely.

Months 2-3: Full rhythm restored. The pathway has rebuilt. Most reorder Verdara not because they need it daily anymore, but because they don't want to risk going back.

Of my 80+ patients, 76 reduced or eliminated their daily osmotic laxative within 30 days. I've never seen a result like that with any other intervention in my career.

What Should Have Been Normal All Along

I want you to understand what I think about every time a new Zepbound patient walks into my office.

You should not have to plan your morning around a blue box on your kitchen counter.

You should not be telling your sister you're "fine, just tired" when the brick arrives at dinner.

You should not be calling a nurse hotline only to hear "adjust the dose as needed."

You should not have spent seven months — or seven years — paying a cost nobody warned you about.

The pathway your body uses to move things through your gut is the same pathway it has used for every meal of your entire life. It hasn't stopped working. It's been bypassed.

There is a difference.

How To Get It

Verdara Soursop Drops is a 2oz bottle of concentrated bitter extract. It typically lasts 30-60 days depending on use.

Verdara is currently offering a 60-Day Money-Back Guarantee. If it doesn't work for you, return it. Full refund. No questions.

Demand has grown faster than supply over the past three months — partly because gastroenterologists like myself have started recommending it. The bitter leaf and root harvest is limited, and the company has been clear they will not dilute the extract to scale faster.

"Five months on Zepbound and Miralax was my entire morning routine. Up to three capfuls a day by the end. Started Verdara on Sunday, didn't need Miralax by Wednesday. Three weeks later and still haven't touched it."

— Jennifer M., Tucson, AZ

"My dose kept climbing and my GI said it was normal. It wasn't normal. Verdara was the first thing that actually ended the loop."

— Amanda K., Portland, OR

"I thought something was permanently wrong with my gut. Turns out I just needed to stop bypassing what my body was trying to do. I feel like myself again."

— Linda P., verified customer

IN STOCK: Verdara Soursop Drops — Limited Supply 

Because the extract uses only the bitter leaves and roots (not the fruit), harvest quantities are limited. Verdara has been selling out faster than expected.