Best Weight Management Programs in 2026

Oral weight management vs GLP-1 injections

Not all weight management medications work the same way. The two main prescription routes are GLP-1 receptor agonists, such as semaglutide, and oral medications such as metformin, bupropion and naltrexone, which can be prescribed individually or in combination.

GLP-1 receptor agonists were originally developed to treat type 2 diabetes and have become increasingly popular for weight management because they can be effective at helping people lose weight. They mimic the GLP-1 hormone naturally found in the gut. The medication binds to GLP-1 receptors, encourages the body to release more insulin, helps lower blood sugar and reduces glucagon production. GLP-1 medications also slow the release of food from the stomach, which can increase feelings of fullness after eating. They are given as injections.

Oral combinations take a different approach. Rather than mimicking a single gut hormone, they pair medications that each act on a different part of the problem: blood sugar handling, appetite and cravings. For people who prefer to avoid injections, or who are looking for an option after stopping a GLP-1, an oral plan may be worth discussing with a licensed provider.

How metformin, bupropion and naltrexone work together

Each of the three medications has a long history in other uses, and each contributes something different to a weight management plan.

• Metformin, for blood sugar: originally developed to manage type 2 diabetes. It reduces the amount of glucose absorbed from food, decreases new glucose production in the liver and improves insulin sensitivity. It can contribute to modest weight loss in adults with and without diabetes, and may be particularly helpful for people with insulin resistance or prediabetes.
• Bupropion, for appetite: commonly used to treat depression and seasonal affective disorder and as a smoking cessation aid. It acts on brain chemicals such as dopamine and norepinephrine, which can support mood and motivation and may reduce appetite and food cravings.
• Naltrexone, for cravings: commonly used to treat opioid and alcohol dependence. It blocks opioid receptors in the brain, disrupting the reward loop that often leads to overeating, and can complement the appetite effects of bupropion.

Combined, metformin targets insulin efficiency and sugar absorption, while bupropion and naltrexone work together to help reduce cravings and support healthier habits. By addressing both the physical and the behavioral sides of weight management, a combination is designed to help people stay consistent with their plan.

What results look like, and over what timeline

Results depend on the medication, the dose, adherence and the lifestyle changes made alongside treatment. Research on metformin has shown modest weight loss, along with reductions in waist circumference and body weight, and the Diabetes Prevention Program followed participants over the long term to study its safety and tolerability.

For GLP-1 medications, the majority of semaglutide trial participants lost between 5 and 10% of their body weight. Oral combinations and injections are different tools, and individual results may vary.

Across every option, the approved guidance is consistent on one point: medication works best alongside nutrition and activity habits. Helpful habits include:

• Taking medications exactly as prescribed, and speaking with your provider before changing the dose or routine
• Building meals around whole foods, lean proteins, fruits and vegetables
• Aiming for at least 150 minutes of moderate exercise per week

Keeping up healthy behaviors even after stopping a combination medication can help sustain weight loss over time.

Keeping weight off after stopping a GLP-1

Weight regain after stopping a GLP-1, sometimes called rebound, is common. One study found that the majority of participants regained two-thirds of their prior weight loss a year after discontinuing semaglutide. Keeping the weight off is possible, but it takes consistent exercise, a healthy diet and a thoughtful discontinuation plan.

• Taper slowly: stopping abruptly may lead to rapid regain. Follow your provider's instructions for gradually lowering the dose. One study tapered patients off semaglutide over 9 weeks with diet and exercise coaching.
• Keep nutrition habits: a balanced diet, portion awareness and regular meal patterns can help regulate appetite and prevent overeating.
• Stay active: at least 150 minutes of moderate aerobic activity per week, plus strength training at least twice a week.
• Sleep and stress: aim for 7 to 9 hours of sleep. Poor sleep can disrupt hunger hormones, and chronic stress can lead to emotional eating.
• Medical support: ask your provider about transitioning to other options, including oral medications such as bupropion, naltrexone and metformin.
• Monitoring: check in regularly on weight, habits and any underlying conditions that may influence weight.

Side effects

Every prescription medication carries potential risks, and it is important to understand them before starting. Common side effects of metformin, bupropion and naltrexone include:

• Nausea
• Anxiety
• Diarrhea
• Drowsiness

Side effects are usually minor and can often be managed with home remedies or over-the-counter treatments. Review the full list of risks, drug interactions and side effects in the important safety information, and talk to a licensed provider about anything specific to your health history.

Who is a candidate?

A metformin, bupropion and naltrexone combination may be most suited to:

• People with insulin resistance or prediabetes
• People struggling with emotional or binge eating
• People who want a plan that addresses both the physical and behavioral sides of weight management
• People who prefer an oral option, or who are looking for support after stopping a GLP-1

Oral weight management medications are not right for everyone. A licensed provider reviews your health history and goals before deciding whether any treatment is appropriate.

Medication is one part of the plan. Regular check-ins with your provider, plus support from a registered dietitian, personal trainer or weight management specialist, can add personalized strategies for diet and exercise. Some people also find that a support group, family or friends help them stay accountable. Setting realistic goals and reviewing progress with your provider can help you stay motivated.

Cost

What you pay depends on the type of medication, whether it is a brand-name or compounded product, whether insurance applies and what the program bundles in, such as provider visits, coaching or check-ins. Brand-name GLP-1 programs often involve insurance navigation, while oral combination plans are typically offered as a recurring direct-pay subscription.

When comparing programs, check what is included in the monthly price, whether follow-up visits cost extra, and how easily you can pause or cancel. Pricing and promotions change, so confirm current costs on each provider's site before you start.

Sources

1. Diabetes Prevention Program Research Group. Long-term safety, tolerability, and weight loss associated with metformin in the Diabetes Prevention Program Outcomes Study. Diabetes Care. 2012.
2. Rodriguez P, et al. Metformin for weight loss. Cleveland Clinic Journal of Medicine. 2023.
3. Halpern B, et al. Combinations of drugs in the treatment of obesity. Pharmaceuticals. 2010.
4. MedlinePlus (National Library of Medicine). Metformin.
5. MedlinePlus (National Library of Medicine). Bupropion.
6. Wilding JPH, et al. Weight regain and cardiometabolic effects after withdrawal of semaglutide: the STEP 1 trial extension. Diabetes Obes Metab. 2022.
7. Ahrén B, et al. Semaglutide induces weight loss in subjects with type 2 diabetes regardless of baseline BMI or gastrointestinal adverse events in the SUSTAIN 1 to 5 trials. Diabetes Obes Metab. 2018.
8. U.S. Department of Health and Human Services. Physical Activity Guidelines for Americans, 2nd edition.