Best medications for weight loss
For managing excess weight, the foundation isn't a pill or an injection — it's everyday habits around eating and moving. Health authorities are consistent: the basics are a healthy eating pattern, regular physical activity, enough sleep, and sustainable behavior changes, with the CDC noting that people who lose weight gradually (about 1 to 2 pounds a week) are more likely to keep it off. Medication has a real place, but the NIH's NIDDK is blunt that weight-management medicines "don't replace physical activity or healthy eating habits" and "work best when combined with a lifestyle program" — they're added when lifestyle changes alone haven't been enough, not used to skip them. On the drug side, two things are worth knowing up front. First, orlistat (Alli) is the only FDA-approved weight-loss drug you can buy over the counter; the other effective options are prescription-only and require a clinician's evaluation. Second, the "fat burners" and diet supplements sold OTC are dietary supplements, not approved drugs — per the NIH Office of Dietary Supplements there's little good evidence they produce meaningful weight loss, some carry real safety risks, and the FDA repeatedly finds such products spiked with hidden, undeclared drugs. They are not listed as options below for those reasons.
What weight loss is, how it is treated, and every drug we rate for it →
For options we rate, we show our independent FDA recall-safety rating(0–100) — a signal GoodRx and Drugs.com don’t provide. Higher is safer.
Get treated for weight loss online
Licensed online providers — consult & get prescribed if eligible.
Advertising disclosure: We may earn a commission, at no extra cost to you. This never affects our ratings. Details
Over-the-counter options
Available without a prescription — follow each label.
Alli Lipase inhibitor Our rating 72/100 | The only FDA-approved over-the-counter weight-loss drug. It blocks gut enzymes so some dietary fat passes out undigested instead of being absorbed; approved for overweight adults 18+ and only alongside a reduced-calorie, low-fat diet. Common GI effects (oily/loose stools, gas with discharge) are worse with high-fat meals; take a daily multivitamin because it lowers absorption of vitamins A, D, E, and K. The FDA label also warns of rare kidney injury/kidney stones and rare liver injury — ask a health professional first if you have had kidney or liver problems. |
Prescription options
A doctor may prescribe these — not for self-treatment.
Wegovy GLP-1 receptor agonist Our rating 70/100 | Mimics the gut-brain hormone GLP-1 to reduce appetite and increase fullness. A doctor may prescribe it for chronic (long-term) weight management; given as a weekly injection, with a once-daily oral 25 mg tablet version also FDA-approved. Carries a boxed warning about thyroid C-cell tumors; common side effects are nausea, vomiting, and diarrhea. |
Zepbound Dual GIP/GLP-1 receptor agonist | Acts on two gut hormones (GIP and GLP-1) to curb appetite. A doctor may prescribe it for chronic weight management as a weekly injection; it is also FDA-approved to treat moderate-to-severe obstructive sleep apnea in adults with obesity. Same hormone-class GI side effects as other GLP-1 drugs. |
Foundayo Oral GLP-1 receptor agonist | A small-molecule GLP-1 pill, FDA-approved in 2026, taken once daily at any time of day with no food or water restrictions. A doctor may prescribe it for chronic weight management as a pill-based alternative to injectable GLP-1 drugs. Nausea and other GI effects are common. |
Saxenda GLP-1 receptor agonist Our rating 70/100 | An older, shorter-acting GLP-1 drug given as a once-daily injection. A doctor may prescribe it for chronic weight management; it generally produces less weight loss than semaglutide or tirzepatide, which is worth discussing with a clinician. |
Qsymia Appetite suppressant + anticonvulsant combination | Combines a stimulant appetite suppressant with topiramate (a seizure/migraine medicine) to reduce hunger and increase fullness. A doctor may prescribe this once-daily oral capsule for chronic weight management — an option for people who want to avoid injections. Not for use in pregnancy because of topiramate's risks. |
Contrave Opioid antagonist + antidepressant combination | Combines naltrexone with bupropion (an antidepressant) to reduce appetite and cravings. A doctor may prescribe this oral tablet for chronic weight management — sometimes considered for people who also have depression or who want to avoid stimulants and injections. |
Xenical Lipase inhibitor Our rating 72/100 | The prescription, higher-strength (120 mg) version of orlistat, taken by mouth with each fat-containing meal to block absorption of some dietary fat. A doctor may prescribe it for people with obesity or weight-related conditions; best suited to those who can manage the GI side effects from unabsorbed fat. The same drug is sold OTC at a lower dose as Alli. |
phentermine Adipex-P, Lomaira Sympathomimetic appetite suppressant | A stimulant that decreases appetite, taken as an oral tablet/capsule. Unlike the drugs above, it is FDA-approved only for short-term use (typically a few weeks) to jump-start weight loss under supervision, not for long-term management. It is a controlled substance and can raise heart rate and blood pressure. |
How to choose
Prescription weight-management medication isn't for everyone who wants to lose a few pounds — per NIDDK it's generally intended for adults with a BMI of 30 or greater, or 27 or greater plus a weight-related condition such as high blood pressure or type 2 diabetes, and the choice is "a decision between you and your health care professional." A clinician weighs your BMI, other health conditions, the medicines and supplements you already take, and each drug's side-effect profile before deciding whether a medication is appropriate and which one fits. If you want a non-prescription start, orlistat (Alli) is the only FDA-approved OTC option and works only paired with a reduced-calorie, low-fat diet. Among prescription options a doctor might consider, the GLP-1 and GIP/GLP-1 drugs (Wegovy, Zepbound, Saxenda, and the newer oral options Wegovy pill and Foundayo) are used for long-term management; Qsymia and Contrave are oral non-injectable alternatives; and phentermine alone is for short-term use only. Whatever the route, treat the diet, activity, and behavior changes as the core of the plan — that's what makes any medication work, and for many people those changes are enough on their own. Be skeptical of OTC "fat burners," "metabolism boosters," and diet supplements: the NIH finds little good evidence they help, some can harm the liver or raise blood pressure, and the FDA repeatedly finds them spiked with hidden prescription or banned drugs even when labeled "all-natural." Talk to a healthcare provider before trying any supplement, especially if you have high blood pressure, diabetes, or heart or liver disease.
When should I see a doctor?
Talk to a clinician before starting, stopping, or seeking any prescription weight-loss medication — and be especially careful about where a product comes from, which is the biggest safety issue right now. The FDA has warned about unapproved, compounded, and counterfeit GLP-1 products (versions of semaglutide and tirzepatide) sold online and direct-to-consumer; these skip the FDA's review and may contain the wrong ingredient, too much or too little drug, or harmful additives. Buy only from a state-licensed pharmacy or a distributor your clinician approves, never raw "research-purposes" powders, and never use these medicines during pregnancy or while planning one. See a doctor promptly if you have obtained a product from an uncertain source, if you develop severe or persistent side effects such as ongoing vomiting, diarrhea, or severe abdominal pain, or if you are losing weight rapidly or feel unwell. A clinician can confirm whether a medication is right for you, prescribe a legitimate product, and monitor you safely.
Before you combine anything
Sources
- Prescription Medications to Treat Overweight & Obesity — NIDDK (NIH) ↗
- FDA's Concerns with Unapproved GLP-1 Drugs Used for Weight Loss — FDA ↗
- ALLI (orlistat) 60 mg — FDA Drug Facts label (DailyMed) ↗
- Orlistat — MedlinePlus (NIH) ↗
- Dietary Supplements for Weight Loss — Consumer Fact Sheet, NIH Office of Dietary Supplements ↗
- Losing Weight — CDC Healthy Weight ↗
General reference, not medical advice, and not a substitute for your doctor or pharmacist. The right choice depends on your symptoms, health conditions, age, and other medicines — always read each label and confirm before taking anything.