A patient came into my emergency room vomiting 10 times a day, two days after a semaglutide injection. They had just increased their dose. When I asked why, they did not know. It was what the app told them to do.
Ozempic, Wegovy, Mounjaro and the rest of the GLP-1 family are the biggest story in medicine right now, and the conversation around them has collapsed into two camps. Half the internet calls them a miracle. The other half calls them poison. Neither is being straight with you.
So this episode runs them through the same framework I use for every medication. We start with the physiology, because not all GLP-1s are created equal and the difference between a GLP-1 agonist and a dual GIP and GLP-1 agonist actually matters when you are reading about them online.
Then question one, what is the real benefit? Split by condition, because these are not just weight loss drugs. There is the head-to-head diabetes data on blood sugar control. There is a trial of 17,604 people with cardiovascular disease but no diabetes, where the rate of cardiovascular death, heart attack or stroke dropped meaningfully. And there is the tirzepatide weight data, which approaches surgical territory.
Then question two, what are the real risks? I give you the actual discontinuation number from a large trial rather than a vague warning about nausea, and we cover the rarer risks worth screening for.
And then the part I care about most, because it is my world and it is being badly undercommunicated. These drugs slow gastric emptying. That is the mechanism, not a side effect. Which means when you fast before a procedure, your stomach may not be empty. There is an ultrasound study on exactly this, and the number should change how you prepare for surgery.
We finish with muscle, fiber, what actually happens when you stop, and the specific hazard with compounded and app-directed prescribing.
I am Dr Adrian Cois, an Emergency Medicine physician and Assistant Professor. Companion guide and the full reference list at drcois.com.
Let's chase less bad days and more good decades together.
Key takeaways
● The benefit is real and goes well beyond weight loss,with a demonstrated reduction in cardiovascular death, heart attack and strokein people without diabetes.
● These drugs were built for type 2 diabetes. The weight loss was a happy side effect, and the diabetes evidence base is still the largest one.
● The most common side effects are gastrointestinal, and in one large trial roughly one in six people stopped the drug permanently because of adverse effects.
● Slowed gastric emptying is the mechanism, not a side effect, which is why it cannot simply be avoided.
● Tell every clinician on your care team that you take a GLP-1, especially before any procedure. Do not assume it is in the chart.
● Protein, resistance training and fiber matter more onthese drugs, not less.
● Weight tends to return when you stop, which is also true after any diet. That makes this chronic disease management, not a short course.
● Dosing errors from compounded and app-directed prescribing are what land people in the emergency department.