GLP-1 (glucagon-like peptide-1) is a naturally occurring hormone in the gut that regulates appetite and blood sugar. Weight loss shots are synthetic versions of this hormone and mimic its effects. They promote weight loss by inducing:
- Appetite Suppression: The medications signal the brain to increase feelings of fullness, reducing cravings and food intake.
- Slower Digestion: Delays gastric emptying, which keeps food in your stomach longer so you feel satisfied with smaller portions.
- Blood Sugar Control: Originally developed for Type 2 diabetes, the drug prompts the pancreas to release insulin when blood sugar is high.
Many people lose a meaningful amount of weight with GLP-1 injections. During clinical trials, participants lost an average between 10% to 20% of their starting body weight, depending on the medication and dose. That said, results vary from person to person. In addition to the medication and dose, factors such as treatment duration, lifestyle habits, and individual biology all play a role. Some people lose weight steadily, while others see slower or more modest changes. There are also those who don't respond at all—about 10% of patients have a newly discovered genetic “GLP-1 resistance” which is similar to insulin resistance in Type 2 diabetes.
FDA-Approved Options
- Wegovy (semaglutide): Taken as a weekly injection, it targets the GLP-1 hormone. It is approved for chronic weight management alongside lifestyle changes. These shots are generally prescribed for individuals with a BMI of 30 or higher (or 27+ with weight-related conditions like high blood pressure). They are typically long-term commitments, as most of the lost weight returns if the medication is stopped. In addition to helping people lose weight, Wegovy is also prescribed for its cardiovascular and liver-related benefits. This is a side benefit if you have heart disease or metabolic dysfunction-associated steatohepatitis (a type of fatty liver disease). Starting July 1, 2026, Medicare launched a temporary pilot program called the
Medicare GLP-1 Bridge that provides coverage for select weight-loss drugs at a $50 monthly copay. However, Ozempic (described below) is not included in this weight-loss pilot program because it is FDA-approved to treat Type 2 diabetes, not specifically for weight loss.
- Zepbound (tirzepatide): A weekly injection that targets both GLP-1 and another appetite-related hormone (GIP), often yielding higher weight loss results. Alternatively, Zepbound can be a good choice if you have moderate-to-severe obstructive sleep apnea, since it’s approved for this condition too.
- Saxenda (liraglutide): A daily injection also used for long-term weight management.
Ozempic Shots
Contains the same active ingredient (semaglutide) that is approved for chronic weight management under the brand name Wegovy, but Ozempic is not officially approved as a weight-loss drug. Ozempic is administered as a weekly subcutaneous injection using an injector pen. Depending on insurance coverage, a one-month supply can range from around $25 with insurance to over $1,000 without insurance. GLP-1 injections are generally intended for long-term treatment, not short-term weight loss. These medications work best when they’re used consistently over time, but there are side effects.
Ozempic Pill
Ozempic is available as a once-daily pill (semaglutide). It is primarily prescribed for adults with type 2 diabetes along with diet and exercise to lower blood sugar and reduce the risk of major cardiovascular events. It is taken once daily, first thing in the morning on an empty stomach. Consumption instructions are very specific: Swallow the tablet whole with a maximum of 4 oz of plain water. Do not split, crush, or chew the pill. Wait at least 30 minutes before eating, drinking, or taking other oral medications.
Typical Dosing Schedule
Doctors are instructed to gradually increase the dosage to allow the patient’s body to adjust and minimize gastrointestinal side effects:
- Days 1–30: 1.5 mg (Starter dose to help the body get used to the medicine)
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Days 31–60: 4 mg (Maintenance dose to help lower blood sugar)
- Day 61 and beyond: 9 mg (Higher dose, used if more blood sugar control is needed)
Common Side Effects
The most frequently reported side effects include:
Nausea, vomiting, diarrhea, stomach (abdominal) pain, constipation, decreased appetite (nutrient deficiencies)
More serious side effects include:
Pancreatitis (inflammation of the pancreas), gallbladder problems, acute kidney damage (often due to dehydration), eye problems, including vision loss, severe gastroparesis (slowed stomach emptying)
GLP-1s also carry a boxed warning (the FDA’s strongest medication warning) for an increased risk of thyroid C-cell tumors based on findings from animal studies.
What are the long-term downsides to GLP-1?
Long-term use of GLP-1 medications (like Wegovy, Ozempic, and Mounjaro) carries several downsides, primarily stemming from prolonged gastrointestinal changes, loss of muscle mass, and the need for lifelong adherence. The number on the scale may be the least useful way to know if the drug is working. Patients may assume weight loss and fat loss are the same thing, and that fat loss always means better health. But weight loss on a GLP-1 could include loss of muscle, nutritional reserve and, in some cases, loss of heart muscle tissue (myocardium), creating a risk of a different problem. That is especially important for older adults and anyone already at risk of low appetite, undernutrition, or sarcopenia—an age-related loss of muscle mass and strength.
People on GLP-1s can quietly fall short on protein, fiber, B vitamins, minerals, and total energy. Over time, that can affect muscle mass, energy, immune function, and recovery. In other words, the medication may help reduce body size while simultaneously eroding some of the body’s important tissue reserves. Losing weight is not always the same as improving health.
The primary long-term downsides include:
- The Rebound Effect (Weight Regain): GLP-1s are typically a long-term commitment. Studies consistently show that if you stop taking the medication, you will likely regain the lost weight and your cardiovascular benefits may reverse.
- Gastrointestinal Complications: While nausea often improves, persistent constipation is a highly common long-term issue. In more severe cases, delayed stomach emptying can lead to chronic gastroparesis or even bowel obstructions.
- Muscle and Bone Loss: Rapid weight loss causes the body to shed both fat and lean muscle mass. Up to 40% of the weight lost can be muscle, which can slow your metabolism. Accelerated bone density loss is also a concern, which can increase fracture risk over time.
- It’s Always On: GLP-1 is a natural peptide (a hormone) that’s produced in the small intestine from the metabolites (byproducts) of your gut microbiome. In its natural form, GLP-1 lasts only seconds to a couple of minutes, operating in pulses rather than as a constant signal. The real benefit may come from this biological peptide being pulsed short durations, and then you stop, while GLP-1 medicines, by contrast, are always on. That distinction matters because human biology runs on cycles. We alternate between fasting and feasting, stress and recovery, wakefulness and sleep. Never before has our body been exposed to this peptide for such long-term activation. What happens when we bypass the body’s regulatory constraints?
- Excessive Fat Loss: The long-term effect of excessive fat loss on cholesterol could directly impact heart and brain health. Studies are needed in this area. A condition called
"Ozempic earlobes" (or "Ozempic ears") refers to the thinning, elongating, or sagging of the earlobes after rapid, significant weight loss from GLP-1 medications like Ozempic, Wegovy, or Mounjaro. This side effect occurs because the body loses fat in the small fat pads of the earlobes, causing the skin to lose volume and elasticity. Because of the deflation and loss of structural support, people often experience a few noticeable changes they never expected:
- Drooping Earrings: Studs may tilt or droop forward because there isn't enough tissue to keep them standing upright.
- Wrinkling & Sagging: The skin can appear loose, elongated, or prematurely aged. Doctors offer cosmetic, non-surgical, and surgical options to restore volume and tighten the skin.
Amy Schumer stopped taking Ozempic because the medication caused severe side effects—including intense nausea, vomiting, and a complete lack of energy—that left her bedridden and unable to play with her son. While she lost about 30 pounds very quickly, she ultimately decided the physical toll was too high to make it livable. Her intense reactions were later linked to the gene, which makes her extremely prone to the types of nausea and sickness she also experienced during her pregnancies.
Bottom line: GLP-1 weight loss shots and pills are drugs with serious side effects. They are synthetic (not natural) approaches to force the body into particular state that can reduce weight significantly, but always with an associated cost. Be sure to carefully weigh the risks involved.
