The most effective options for weight loss fall into three categories: prescription medications, over-the-counter products, and lifestyle strategies. Prescription drugs produce the largest results by far, with newer injectable medications helping people lose 14% to 21% of their body weight in clinical trials. But not everyone qualifies, and the costs and tradeoffs are real. Here’s what actually works, what doesn’t, and what to expect from each option.
Prescription Medications: The Strongest Option
Prescription weight loss drugs are available if you have a BMI of 30 or higher, or a BMI of 27 or higher with a weight-related condition like high blood pressure or type 2 diabetes. These are the only options with large-scale clinical trial data showing significant, consistent weight loss.
The two most effective drugs right now are both injectables you take once a week. Tirzepatide (sold as Zepbound) produced an average weight loss of about 50 pounds, or 20.2% of body weight, over 72 weeks in a head-to-head clinical trial. Semaglutide (sold as Wegovy) produced an average loss of about 33 pounds, or 13.7% of body weight, over the same period. Nearly a third of people on tirzepatide lost at least 25% of their body weight. These are results that rival what many people achieve with bariatric surgery.
Older oral prescription options also exist. One combines phentermine with topiramate and works as an appetite suppressant. It’s less expensive than the injectables but carries a different side effect profile: constipation, dry mouth, tingling in the hands and feet, insomnia, dizziness, and in some cases mood changes like increased anxiety or depression. It can’t be used during pregnancy due to birth defect risks, and it’s not appropriate for people with glaucoma or an overactive thyroid. Another oral option combines naltrexone with bupropion, which targets the brain’s hunger and reward signals.
What Happens When You Stop
This is the part most people don’t hear about upfront. A large review of studies published in The Lancet found that one year after stopping GLP-1 medications like semaglutide or tirzepatide, people had regained 60% of the weight they lost during treatment. Over longer periods, the regain plateaued at roughly 75% of the lost weight. Some people regained all of it and more.
This doesn’t mean the drugs don’t work. It means obesity is a chronic condition, and these medications function more like blood pressure drugs than antibiotics. They manage the problem while you take them. If you’re considering starting, it’s worth thinking of them as a long-term commitment rather than a temporary fix. The weight loss is real, but so is the rebound if you stop without other strategies in place.
What Injectable Medications Cost
Both Wegovy and Zepbound are available directly from their manufacturers at $499 per month for people whose insurance doesn’t cover them. Zepbound’s lowest starter dose costs $349 per month. Some insurance plans do cover these medications, but coverage varies widely, and many plans still exclude weight loss drugs entirely. If you’re exploring this route, check your specific plan’s formulary before assuming you’ll pay the retail price.
Over-the-Counter Supplements: Mostly Unproven
The supplement aisle is full of products promising weight loss, but the evidence behind them is thin. The Mayo Clinic notes that supplement manufacturers rarely conduct clinical trials, and overall there is little proof that any dietary supplement helps with healthy, long-term weight loss. Green tea extract, garcinia cambogia, glucomannan, and similar products may have individual studies suggesting modest effects, but the results are inconsistent and the weight loss, when it occurs, tends to be small.
The one over-the-counter medication with a real mechanism of action is orlistat (sold as Alli at a lower dose). It works by blocking your body from absorbing some of the fat you eat. The tradeoff is significant: common side effects include oily spotting on clothing, urgent bowel movements, loose or fatty stools, difficulty controlling bowel movements, and rectal discomfort. These effects are most intense in the first weeks but can persist the entire time you take it. Many people find the side effects intolerable enough to stop.
Lifestyle Strategies That Move the Needle
No pill replaces the basics, and even the most effective medications work better alongside lifestyle changes. The strategies with the most consistent evidence behind them are straightforward, though not always easy to maintain.
Protein intake matters more than most people realize. Eating more protein at each meal reduces hunger between meals by keeping you fuller longer and slightly increases the number of calories your body burns during digestion. A practical target is including a palm-sized portion of protein (eggs, chicken, fish, Greek yogurt, legumes) at every meal rather than relying on carbohydrate-heavy breakfasts and snacks.
Strength training preserves muscle mass during weight loss, which matters because muscle burns more calories at rest than fat does. Losing weight through diet alone often means losing both fat and muscle, which slows your metabolism over time and makes regain more likely. Even two sessions per week of resistance exercise can make a meaningful difference in body composition.
Sleep is an underappreciated factor. Consistently getting fewer than seven hours per night increases hunger hormones and makes high-calorie foods more appealing. For some people, improving sleep produces noticeable changes in appetite without any other intervention.
Calorie tracking, while tedious, remains one of the most reliable tools for the first few months. Most people significantly underestimate how much they eat. Even a few weeks of honest tracking builds awareness that persists after you stop logging every meal.
Choosing the Right Approach
If you have a significant amount of weight to lose and meet the BMI thresholds, prescription medication combined with lifestyle changes will produce the best results. The newer injectables are the most effective drugs ever developed for weight loss, but they’re expensive and they work best as an ongoing treatment rather than a short course.
If you don’t qualify for prescriptions or prefer to start without medication, focus on protein intake, strength training, sleep, and a modest calorie deficit. These won’t produce the dramatic results of tirzepatide, but they’re sustainable, free, and they build a foundation that makes any future intervention more effective.
Skip the supplement aisle. The money is better spent on quality food or a gym membership. If something sounds too good to be true on the label of a bottle, the clinical evidence almost certainly agrees with your skepticism.