Weight-loss pills by evidence: FDA-approved prescription pills (Wegovy pill, Foundayo, Qsymia, Contrave, orlistat, phentermine), Alli over the counter, supplements and red flags.
Fact-checked against FDA labels and official sources; not yet reviewed by a licensed clinician. This page is education, not medical advice. Talk to your doctor before starting, stopping or changing any treatment.
Key takeaways
- Two daily GLP-1 pills are FDA approved for weight management in adults: the Wegovy pill (oral semaglutide) and Foundayo (orforglipron).[3]
- Alli is the only over-the-counter medicine approved for weight loss, for overweight adults 18 and older with a reduced-calorie, low-fat diet.[8]
- Phentermine is labeled only for short-term use of a few weeks; Qsymia, Contrave and orlistat are labeled for long-term use.[9]
- Acai berry, bitter orange and green tea supplements have not been shown to produce meaningful weight loss, according to the NIH's NCCIH.[13]
- The FDA warns that many weight-loss products contain hidden drug ingredients, and its list covers only a small fraction of them.[14]
In short: Weight-loss pills fall into three very different groups. Prescription pills approved by the FDA for weight management include the Wegovy pill and Foundayo (both GLP-1 medicines), Qsymia, Contrave, Xenical and short-term phentermine. Alli is the only over-the-counter pill approved for weight loss. Dietary supplements sold for weight loss are not FDA approved for that purpose, most have little evidence that they work, and the FDA keeps finding some that hide prescription drugs (checked on 2026-10-06).
This hub separates the approved pills from the rest, explains how each type works and what its label warns about, and lists the red flags that should make you stop before buying. It is general information; a clinician who knows your history decides whether any medicine fits you.
Start here: do these next 1-2-3
- Check the badge. “FDA approved for weight management” and “Dietary supplement (not FDA approved)” are very different things; see status badges explained.
- List everything you take. Several weight-loss pills interact with common medicines, and some are not for people with certain conditions.
- Talk with a clinician or pharmacist before starting any pill, including over-the-counter products and supplements.
Prescription pills approved for weight management
| Pill | Active ingredient(s) | Labeled for (in general terms) | Label points to know |
|---|---|---|---|
| Wegovy pill | Semaglutide (GLP-1) | Adults; also heart-risk reduction | Daily, morning, empty stomach, up to 4 oz of water, wait 30 minutes |
| Foundayo | Orforglipron (GLP-1) | Adults | Daily, with or without food |
| Qsymia | Phentermine and topiramate | Adults; children 12+ with obesity | Schedule IV; not in pregnancy; available through a REMS safety program |
| Contrave | Naltrexone and bupropion | Adults | Boxed warning on suicidal thoughts; not with uncontrolled high blood pressure, seizures or chronic opioid use |
| Xenical (orlistat) | Orlistat | Obesity, or BMI 27+ with other risk factors | Blocks some dietary fat; oily stools; take a daily multivitamin at a different time |
| Phentermine | Phentermine | Short-term use (a few weeks) | Schedule IV; not with heart disease, uncontrolled high blood pressure, glaucoma or hyperthyroidism |
How the prescription pills are taken (labels, checked October 6, 2026)
- Morning, empty stomachWegovy tablets: up to 4 oz of water, then wait 30 minutesWegovy label 2.3
- Any time, with or without foodFoundayo (orforglipron), once dailyFoundayo label 2.1
- With fatty meals, 3 times a dayOrlistat (Xenical) 120 mg, plus a multivitamin at another time of dayXenical label 2
- Short term, a few weeksPhentermine alone is labeled only as a short-term aidPhentermine label 1
Checked on October 6, 2026
Who they are for, and what to expect
According to the NIH, prescription weight-management medicines are generally considered for adults with a BMI of 30 or more, or 27 or more with a weight-related condition such as high blood pressure or type 2 diabetes; the labels above define each medicine’s population more precisely. The NIH summarizes that after one year, adults who take a weight-management medicine as part of a lifestyle program lose 3% to 12% more of their starting weight than people in the program without medicine, and that some lose 10% or more. It also notes that people will probably regain some weight after stopping. Our BMI calculator shows where you stand, and a clinician can tell you whether any of these medicines fits your health history.
| Item | Pill | Placebo |
|---|---|---|
| Wegovy 25 mg tablets, 64 weeks | 13.6% | 2.4% |
| Foundayo 17.2 mg, 72 weeks | 11.1% | 2.1% |
| Qsymia top dose, 56 weeks | 10.9% | 1.6% |
| Qsymia mid dose (overweight with conditions), 56 weeks | 7.8% | 1.2% |
| Contrave, COR-I, 56 weeks | 5.4% | 1.3% |
Separate trials with different people, lengths and lifestyle programs; not head to head. Phentermine alone is labeled for short-term use only.
Source: Wegovy, Foundayo, Qsymia and Contrave prescribing information, section 14 (DailyMed) (checked on October 6, 2026)
| Item | Qsymia top dose | Placebo |
|---|---|---|
| Tingling (paresthesia) | 20% | 2% |
| Dry mouth | 19% | 3% |
| Constipation | 16% | 6% |
| Headache | 11% | 9% |
| Altered taste (dysgeusia) | 9% | 1% |
| Insomnia | 9% | 5% |
| Dizziness | 9% | 3% |
Qsymia side effects differ from GLP-1 pills, which mainly cause nausea and other digestive effects.
Source: Qsymia prescribing information, Table 1 (DailyMed) (checked on October 6, 2026)
The new GLP-1 pills
Two daily pills now bring the GLP-1 approach to tablet form. The Wegovy pill, oral semaglutide, was approved on December 22, 2025; in the OASIS 4 trial, adults lost 13.6% of body weight on average at 64 weeks versus 2.2% on placebo. Foundayo, orforglipron, was approved on April 1, 2026; in ATTAIN-1, adults on the highest dose lost 11.2% over 72 weeks versus 2.1%. These were separate trials. The Wegovy pill has strict rules about taking it on an empty stomach, while Foundayo can be taken with or without food. Their side effects are the same digestive ones seen with GLP-1 injections. Our oral GLP-1 guide and Wegovy pill vs Foundayo compare them, and injections vs pills weighs the two routes.
The older prescription pills
Phentermine is an appetite suppressant first approved in 1959 and labeled only as a short-term aid of a few weeks. Qsymia combines phentermine with topiramate for long-term use; because topiramate can harm a developing baby, the label recommends a pregnancy test before starting and monthly during treatment for people who can become pregnant, and the medicine is dispensed through a REMS safety program. Contrave combines naltrexone with bupropion; because bupropion is also an antidepressant ingredient, it carries a boxed warning about suicidal thoughts and behaviors, and it is not for people with seizure disorders, uncontrolled high blood pressure or chronic opioid use. Orlistat works in the gut, blocking the absorption of some of the fat you eat; the label lists oily spotting, gas with discharge and urgent bowel movements, and advises a daily multivitamin taken at least 2 hours apart from the dose. Our guide to appetite suppressants covers phentermine, Qsymia and Contrave in more depth, and Contrave vs Qsymia compares two of them.
Over the counter: Alli
Alli is a lower-strength orlistat sold without a prescription. Its Drug Facts label says it is for weight loss in overweight adults 18 and older, used along with a reduced-calorie, low-fat diet. The label says not to use it after an organ transplant, with cyclosporine, if you have problems absorbing food or if you are not overweight, and to ask a doctor first if you have had gallbladder problems, kidney stones or pancreatitis, or take blood thinners and some other prescription medicines. It is the only over-the-counter medicine on our list; everything else sold “over the counter” for weight loss is a supplement.
Supplements by evidence
Dietary supplements do not need FDA approval before they are sold, and the NIH’s National Center for Complementary and Integrative Health (NCCIH) notes that many supplements marketed for weight loss have not been tested for safety. It reports that acai berry, bitter orange and green tea have not been shown to produce meaningful weight loss in scientific studies, and that some supplements contain large amounts of caffeine or caffeine-containing herbs such as guarana. The FDA banned supplements containing ephedra because of serious heart risks. Each supplement page on InstaTuck answers one question in large type: is the weight-loss claim established? Start with our supplements hub, which rates fiber, berberine, green tea extract, creatine and others by evidence, and our guide to fat burners.
Red flags: hidden drugs and big promises
The FDA warns that many products claiming to help with weight loss are likely to contain dangerous hidden ingredients, that they are sometimes falsely sold as dietary supplements, foods or “all-natural” treatments, and that they often spread through social media with many positive reviews. Its list of contaminated weight-loss products, last updated September 4, 2026, covers only a small fraction of what is on the market, so a product missing from the list is not proof it is safe. Be wary of:
- claims that sound exaggerated or unrealistic, such as large losses without changing what you eat;
- “natural” products that promise to work like prescription GLP-1 medicines;
- pills or powders sold “for research use” or “not for human consumption”;
- prescription medicines offered online without a prescription. The FDA’s BeSafeRx campaign explains how to recognize a state-licensed online pharmacy.
Cost
Checked on October 6, 2026 on the manufacturers’ sites: the Wegovy pill was $149 to $299 a month self-pay through NovoCare Pharmacy, by strength, and Foundayo $149 to $349 through Lilly. Medicare’s temporary GLP-1 Bridge (July 2026 through 2027) includes both pills for weight management with a $50 copay for people who meet its criteria. For the other medicines, prices vary by pharmacy and plan; our costs hub and the GLP-1 cost comparison keep dated figures. For every approved option, including injections, see the weight-loss medications hub.
Before taking any weight pill
Safety steps that apply to every weight pill
- Get evaluatedA licensed clinician checks your history, blood pressure, heart, mood and current medicines.
- Ask about pregnancyQsymia needs pregnancy tests; GLP-1 pills should be stopped if pregnancy occurs.
- Check interactionsFoundayo has CYP3A4 and simvastatin rules; Wegovy tablets affect levothyroxine; Contrave contains bupropion.
- Buy only with a prescriptionFrom a state-licensed pharmacy; avoid "natural" pills with hidden drugs.
- Follow upReview progress and side effects at regular visits.
InstaTuck does not sell any pill or supplement. Our obesity medicine guide explains who prescribes these medicines, injections vs pills compares routes, and Contrave vs Qsymia compares the two older combination pills.
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- Is a prescription pill an option for me, and which ones fit my health history?
- How do the pills compare with injections for me in results, side effects and cost?
- Could any pill interact with medicines or supplements I already take?
- Is the supplement I am considering safe with my health conditions?
- How long would I take it, and how will we judge whether it is working?
Frequently asked questions
What is the most effective weight-loss pill?
There is no single answer for everyone. The newest prescription pills, the Wegovy pill and Foundayo, led to average losses of 13.6% and 11.2% in their main trials, which were separate studies. A clinician can weigh results, side effects, other conditions and cost for you.
Are there weight-loss pills without a prescription?
Alli (orlistat 60 mg) is the only over-the-counter medicine approved for weight loss. Other over-the-counter products are dietary supplements, which are not FDA approved for weight loss.
Do weight-loss supplements work?
Most have little evidence. The NIH's NCCIH says acai, bitter orange and green tea supplements have not been shown to produce meaningful weight loss, and many products have not been tested for safety.
Is phentermine safe?
Phentermine is FDA approved for short-term use of a few weeks and is a controlled substance. Its label lists people who should not take it, including those with heart disease, uncontrolled high blood pressure, glaucoma or hyperthyroidism. A prescriber decides whether it fits.
Can I buy GLP-1 pills online?
Only with a prescription and from a state-licensed pharmacy. Products sold without a prescription or "for research use" are not legitimate medicines.
Which weight-loss pill works best?
There is no single answer. In their own label trials, average loss was 13.6% with Wegovy tablets, 11.1% with Foundayo, up to 10.9% with Qsymia and 5.4% with Contrave, against 1% to 2.4% on placebo. Trials differed, and side effects and health history matter.
Is there a GLP-1 pill that can be taken with food?
Yes. Foundayo (orforglipron) can be taken once daily with or without food. Wegovy tablets must be taken on an empty stomach with a little water and a 30-minute wait.
How is orlistat taken?
Xenical (prescription orlistat) is one 120 mg capsule three times a day with each main meal containing fat, with a daily multivitamin taken at least 2 hours apart. Alli is a lower-dose, over-the-counter version.
References
- WEGOVY (semaglutide) injection and tablets: prescribing information. Novo Nordisk, via DailyMed, 2026. (accessed October 7, 2026) Drug label
- Drugs@FDA: Wegovy tablets, NDA 218316. U.S. Food and Drug Administration. (accessed October 7, 2026) Government page
- FOUNDAYO (orforglipron) tablets: prescribing information. Eli Lilly and Company, via DailyMed, 2026. (accessed October 7, 2026) Drug label
- Drugs@FDA: Foundayo, NDA 220934. U.S. Food and Drug Administration. (accessed October 7, 2026) Government page
- QSYMIA (phentermine and topiramate) extended-release capsules: prescribing information. Vivus, via DailyMed, 2026. (accessed October 6, 2026) Drug label
- CONTRAVE (naltrexone HCl and bupropion HCl) extended-release tablets: prescribing information. Nalpropion Pharmaceuticals, via DailyMed, 2025. (accessed October 6, 2026) Drug label
- XENICAL (orlistat) capsules: prescribing information. H2-Pharma / CHEPLAPHARM, via DailyMed, 2026. (accessed October 6, 2026) Drug label
- ALLI (orlistat 60 mg) capsules: Drug Facts. Haleon, via DailyMed, 2026. (accessed October 6, 2026) Drug label
- Phentermine hydrochloride tablets: prescribing information. Via DailyMed (generic labeler), 2026. (accessed October 6, 2026) Drug label
- Wharton S, Lingvay I, Bogdanski P, et al.. Oral Semaglutide at a Dose of 25 mg in Adults with Overweight or Obesity (OASIS 4). New England Journal of Medicine, 2025. doi:10.1056/NEJMoa2500969 · PMID 40934115 · NCT05564117 (accessed October 6, 2026) Randomized trial
- Wharton S, Aronne LJ, Stefanski A, et al.. Orforglipron, an Oral Small-Molecule GLP-1 Receptor Agonist for Obesity Treatment (ATTAIN-1). New England Journal of Medicine, 2025. doi:10.1056/NEJMoa2511774 · PMID 40960239 · NCT05869903 (accessed October 6, 2026) Randomized trial
- Prescription Medications to Treat Overweight & Obesity. National Institute of Diabetes and Digestive and Kidney Diseases (NIH). (accessed October 7, 2026) Government page
- 6 Things To Know About Dietary Supplements Marketed for Weight Loss. National Center for Complementary and Integrative Health (NIH). (accessed October 6, 2026) Government page
- Weight loss product notifications (tainted products). U.S. Food and Drug Administration. (accessed October 7, 2026) Government page
- BeSafeRx: your source for online pharmacy information. U.S. Food and Drug Administration. (accessed October 6, 2026) Government page
- FDA’s concerns with unapproved GLP-1 drugs used for weight loss. U.S. Food and Drug Administration, 2026. (accessed October 7, 2026) Government page
- Wegovy at NovoCare Pharmacy: self-pay prices. Novo Nordisk (NovoCare Pharmacy). (accessed October 7, 2026) Other
- Foundayo coverage and savings. Eli Lilly and Company. (accessed October 6, 2026) Other
- Medicare GLP-1 Bridge: information for providers. Centers for Medicare and Medicaid Services. (accessed October 7, 2026) Government page
- Qsymia pricing and home delivery. Vivus. (accessed October 6, 2026) Other
- Contrave savings and CurAccess pharmacy. Currax Pharmaceuticals. (accessed October 6, 2026) Other
Facts checked on October 6, 2026
Educational information, not medical advice. Talk with a qualified healthcare professional about your own situation. In an emergency call 911.