GLP-1 medications have changed how many people approach weight loss, and the questions patients ask about them have changed too. The most common one is not "will it work." It is "is this normal?" A queasy first week, a change in bowel habits, a tiredness that was not there before. Most of it is expected. Some of it is not. Knowing the difference is the point of this article.

Dr. Michael Baptista is a bariatric surgeon in Jacksonville who prescribes and monitors GLP-1 medications through a six-month, physician-supervised medical weight loss program. He also treats, when needed, two of the conditions these medications can bring forward: gallbladder disease and acid reflux. That is an unusual vantage point, and it shapes the advice below.

Why these medications cause side effects at all

GLP-1 medications work in part by slowing how quickly the stomach empties and by changing appetite signals between the gut and the brain. Those two actions are what make the medication effective. They are also the reason for nearly every common side effect. Food stays in the stomach longer, so fullness arrives sooner and lasts longer. For many patients that feels like mild nausea, especially early on and especially after a large or fatty meal.

This is why side effects tend to cluster around two moments: the first few weeks on the medication, and the weeks after a dose is adjusted. In a supervised program, those are exactly the moments a follow-up visit is scheduled, so the pattern is managed rather than endured.

Side effects that are usually expected

These are common, they tend to be mild to moderate, and for most patients they ease within a few weeks as the body adjusts.

Nausea, especially after eating too much or too fast
Constipation, or on the other side, loose stools
Bloating, belching, or a feeling of fullness that arrives quickly
Reduced appetite, sometimes to the point of forgetting to eat
Fatigue in the first weeks, often related to eating less
Mild heartburn
Redness or itching at the injection site

What helps, and what Dr. Baptista's team reviews at each visit: smaller meals eaten slowly, stopping at the first sign of fullness, limiting greasy or fried food, drinking water through the day, and keeping protein and fiber in the diet even when appetite is low. Timing of any dose change is a decision for the prescribing physician, and in the program it is made at a follow-up visit, not by the patient on their own.

Side effects that deserve a call to the office

These are not emergencies, but they are not something to wait out either. Call the office the same day.

Nausea or vomiting that is not improving after the first few weeks, or that returns after it had settled
Constipation lasting more than a few days despite water and fiber
Heartburn that is new, worsening, or waking you at night
Pain under the right ribs, often after meals, which can point to gallbladder issues.
Dizziness or lightheadedness, particularly if you also take medication for blood pressure or diabetes.
Losing weight faster than expected, or feeling weak and unable to eat.

Gallbladder symptoms deserve a specific mention. Rapid weight loss by any method raises the chance of gallstones, and GLP-1 medications are no exception. Dr. Baptista has written separately about GLP-1 medications and gallstones and about GLP-1 medications and acid reflux. Both conditions are treatable, and both are conditions he treats surgically when needed, which is one reason patients in the program are watched for them.

Symptoms that need care right away

These are uncommon, but they are the reason the medication comes with a conversation and not just a prescription. Seek care the same day, and if symptoms are severe, go to the emergency department.

Severe, persistent abdominal pain, especially pain that moves through to the back, with or without vomiting
Vomiting that will not stop, or an inability to keep down liquids
Signs of dehydration: very dark urine, confusion, a racing heart
Symptoms of low blood sugar in patients who also take diabetes medication: shakiness, sweating, confusion
Swelling of the face, lips, or throat, or trouble breathing
A lump or swelling in the neck, hoarseness, or trouble swallowing

If you reach the emergency department, tell them the name of the medication you take and when your last dose was. It changes what they look for.

The question behind the question

Patients who ask "is this normal" are usually asking something else: am I being looked after? In a supervised program the answer is built into the schedule. Monthly follow-ups mean a side effect is discussed within weeks, not months, by a physician who can examine you, adjust the plan, and recognize the handful of problems that need more than reassurance. Dr. Baptista encourages you to contact his office if you have any concerns that you would prefer to discuss prior to your follow-up appointment.

Dr. Baptista's medical weight loss program includes an initial evaluation, medication when appropriate, monthly follow-up visits, and a dietitian. For some patients, the right answer at the end of that evaluation is surgery instead of, or after, medication. That conversation is covered in Surgery or Medication: Which Is Right for You.

Our team will assist you in verifying your benefits, however insurance coverage can vary based on your specific plan and it is always subject to change. We encourage patients to contact their insurance provider directly to confirm coverage and benefits.

To ask about the program, call (904) 724-2263 or request an appointment through the website.

This article is for general education and is not a substitute for medical advice. Always follow the guidance of the physician who prescribes and monitors your treatment.

Please see our medical disclaimer.