The cardboard packaging of two medications used to treat obesity.
Orlistat (Xenical), the most commonly used medication to treat obesity and sibutramine (Meridia), a medication that was withdrawn due to cardiovascular side effects

Anti-obesity medication or weight loss medications are pharmacological agents that reduce or control excess body fat. These medications alter one of the fundamental processes of the human body, weight regulation, by: reducing appetite and consequently energy intake, increasing energy expenditure, redirecting nutrients from adipose to lean tissue, or interfering with the absorption of calories.[1][2][3]

Weight loss drugs have been developed since the early twentieth century, and many have been banned or withdrawn from the market due to adverse effects, including deaths; other drugs proved ineffective. Although many earlier drugs were stimulants such as amphetamines, in the early 2020s, GLP-1 receptor agonists became popular for weight loss.

The medications liraglutide,[4] naltrexone/bupropion,[5] orlistat,[6] semaglutide,[7] and tirzepatide[8] are approved by the US Food and Drug Administration (FDA) for weight management in combination with reduced-calorie diet and increased physical activity. As of 2022, no medication has been shown to be as effective at long-term weight reduction as bariatric surgery.[9] The main treatment modalities for obesity remain dieting (healthy diet and caloric restriction) and physical exercise.[citation needed]

Mechanisms of action

Energy intake

Energy expenditure


Other mechanisms


The first described attempts at producing weight loss are those of Soranus of Ephesus, a Greek physician, in the second century AD. He prescribed elixirs of laxatives and purgatives, as well as heat, massage, and exercise. This remained the mainstay of treatment for well over a thousand years. It was not until the 1920s and 1930s that new treatments began to appear. Based on its effectiveness for hypothyroidism, thyroid hormone became a popular treatment for obesity in euthyroid people. It had a modest effect but produced the symptoms of hyperthyroidism as a side effect, such as palpitations and difficulty sleeping.[36] 2,4-Dinitrophenol (DNP) was introduced in 1933; this worked by uncoupling the biological process of oxidative phosphorylation in mitochondria, causing them to produce heat instead of ATP. Overdose caused fatal hyperthermia and DNP also caused cataracts in some users. After the passage of the Food, Drug, and Cosmetic Act in 1938, the FDA banned DNP for human consumption.[37]

Amphetamines (marketed as Benzedrine) became popular for weight loss during the late 1930s. They worked primarily by suppressing appetite, and had other beneficial effects such as increased alertness. Use of amphetamines increased over the subsequent decades, including Obetrol and culminating in the "rainbow diet pill" regime.[38] This was a combination of multiple pills, all thought to help with weight loss, taken throughout the day. Typical regimens included stimulants, such as amphetamines, as well as thyroid hormone, diuretics, digitalis, laxatives, and often a barbiturate to suppress the side effects of the stimulants.[38] In 1967/1968 a number of deaths attributed to diet pills triggered a Senate investigation and the gradual implementation of greater restrictions on the market.[39] While rainbow diet pills were banned in the US in the late 1960s, they reappeared in South America and Europe in the 1980s.[38] In 1959, phentermine had been FDA approved and fenfluramine in 1973. In the early 1990s two studies found that a combination of the drugs was more effective than either on its own; fen-phen became popular in the United States and had more than 18 million prescriptions in 1996.[40] Evidence mounted that the combination could cause valvular heart disease in up to 30 percent of those who had taken it, leading to withdrawal of fen-phen and dexfenfluramine from the market in September 1997.[39]

In the early 2020s, GLP-1 receptor agonists such as semaglutide or tirzepatide became popular for weight loss because they are more effective than earlier drugs, causing a shortage for patients prescribed these medications for type 2 diabetes, their original indication.[41][42]

Patient population

The United States Food and Drug Administration and the European Medicines Agency have approved weight loss medications for adults with either a body-mass index (BMI) of at least 30, or a body-mass index of at least 27 with at least one weight-related comorbidity. This patient population is considered to have sufficiently high baseline health risks to justify the use of anti-obesity medication.[43][44]

The American Academy of Pediatrics had not previously supported the use of weight loss medication in adolescents but issued new guidelines in 2023. It now recommends considering the use of weight loss medication in some overweight children aged 12 or older.[45] The European Medicines Agency has approved semaglutide for children aged 12 or older who have a BMI in the 95 percentile for their age and a weight of at least 60 kilograms (130 lb).[46][44] However, GLP-1 agonists may not be cost effective in this population.[47]


US FDA approved

The US Food and Drug Administration (FDA) approves anti-obesity medications as an adjunctive therapy to diet and exercise for people for whom lifestyle changes do not result in sufficient weight loss. In the United States, semaglutide (Wegovy) is approved by the FDA for chronic weight management.[48] The FDA guidelines say that a therapy may be approved if it results in weight loss that is statistically significant greater than placebo and generally at least five percent of body weight over six months that comes predominantly from fat mass.[18][49] Some other prescription weight loss medications are stimulants, which are recommended only for short-term use, and thus are of limited usefulness for patients who may need to reduce weight over months or years.[50] As of 2022, there is no pathway for approval for drugs that reduce fat mass without 5 percent overall weight loss, even if they significantly improve metabolic health; neither is there one for drugs that help patients maintain weight loss although this can be more challenging than losing weight.[18]

As of 2022, no medication has been discovered that would equal the effectiveness of bariatric surgery for long-term weight loss and improved health outcomes.[9]

Medication Name Trade name(s) Mechanism of action Current FDA Status placebo-adjusted percent bodyweight lost (highest dose studied)
Semaglutide Wegovy GLP-1 receptor agonist Approved for weight management (chronic) 12%[51]
Phentermine/topiramate Qsymia Phentermine is a substituted amphetamine and topiramate has an unknown mechanism of action Approved for weight management (short-term) by the FDA but not the European Medicines Agency[52] 10%[53] or 8.25 kilograms (18.2 lb)[54]
Naltrexone/bupropion Contrave Approved for weight management (chronic) in the US and EU[55] 5 percent[17]
Liraglutide Saxenda GLP-1 receptor agonist Approved for weight management (chronic) 4 percent[56]
Gelesis100 Plenity Oral hydrogel FDA approved for weight management (chronic) but the American Gastroenterology Association recommends that its use be limited to clinical trials due to lack of evidence.[57] 2%[58]
Orlistat Xenical Absorption inhibitor Approved for weight management (chronic) 3 kilograms (6.6 lb); percentage not provided[59]
Phentermine Substituted amphetamine Approved for weight management (short-term) 5 kilograms (11 lb)[60]
Methamphetamine Desoxyn Substituted amphetamine Approved for weight management (short-term)
Tirzepatide Zepbound Dual GLP-1 receptor agonist and GIP agonist FDA approved for weight management (chronic);[61] EMA approval for weight loss is pending[62] 10.91 kilograms (24.1 lb)[63]


Medication Name Trade name(s) Mechanism of action Current FDA Status placebo-adjusted percent bodyweight lost (highest dose studied)
Lorcaserin Belviq 5-HT2C receptor agonist Withdrawn for safety reasons 6.25 percent[64]
Sibutramine Meridia Serotonin–norepinephrine reuptake inhibitor Withdrawn due to cardiovascular risks[65][66] 19.7 percent[67]
Rimonabant Acomplia, Zimbutli Cannabinoid receptor antagonist Withdrawn for safety reasons 2.6 to 6.3 kilograms (5.7 to 13.9 lb)[68]
Fenfluramine Fintepla, Pondimin Serotonin releasing agent Withdrawn for safety reasons -
Fenfluramine/phentermine (fen-phen) Pondimin Withdrawn for safety reasons 13.9 percent[69]
Dexfenfluramine Redux Serotonin releasing agent Withdrawn for safety reasons 3.5 kilograms (7.7 lb)[70]
2,4-Dinitrophenol Uncoupling agent Withdrawn for safety reasons 17.1 pounds (7.8 kg) per patient on average (uncontrolled study)[71]
Ephedrine Adrenergic agonist Approved for asthma[72] Average of 1.9 kilograms (4.2 lb) in a meta-analysis (all dosages)[73]
ECA stack Combination of ephedrine and caffeine, sometimes adding aspirin Around 4–6 kilograms (8.8–13.2 lb)[74]
Ephedra Plant extract sold as a dietary supplement Contains ephedrine, an adrenergic agonist Banned in 2004 for safety reasons 0.9 kilograms (2.0 lb) per month more than placebo[74]
Amphetamine salts Obetrol Approved 1960, withdrawn 1973; Adderall was later approved for ADHD and narcolepsy and is still used for those purposes
Phenylpropanolamine Was an over-the-counter medication ingredient Withdrawn in 2005 due to risk of hemorragic stroke 1.5 kilograms (3.3 lb)[75]

Never approved

Medication Name Trade name(s) Mechanism of action Current FDA Status placebo-adjusted percent bodyweight lost (highest dose studied)
Retatrutide GLP-1, GIP, and glucagon receptor triple agonist In clinical trials 24 percent in a Phase II trial[76]
Exenatide Byetta GLP-1 receptor agonist Approved for type 2 diabetes 2.5 kilograms (5.5 lb)[77]
Cetilistat Absorption inhibitor Not approved 1.5 kilograms (3.3 lb)[78]
Tesofensine (NS2330) Serotonin–norepinephrine–dopamine reuptake inhibitor Not FDA approved 10.6 percent[79]
Metformin Glucophage Unknown Approved for type 2 diabetes 5.6 percent[80]
Cagrilintide Dual amylin and calcitonin receptor agonist (DACRA) Not approved 7.8 percent[81]
Cagrilintide/semaglutide CagriSema DACRA/GLP-1 agonist combination Not approved 15.4 percent after 32 weeks[27]

Safety and side effects

Some anti-obesity medications can have severe, even, lethal side effects, fen-phen being a famous example. Fen-phen was reported through the FDA to cause abnormal echocardiograms, heart valve problems, and rare valvular diseases.[82] Out of 25 anti-obesity medications withdrawn from the market between 1964 and 2009, 23 acted by altering the functions of chemical neurotransmitters in the brain. The most common side effects of these drugs that led to withdrawals were mental disturbances, cardiac side effects, and drug abuse or drug dependence. Deaths were associated with seven products.[83] Ephedra was removed from the US market in 2004 over concerns that it raises blood pressure and could lead to strokes and death.[84]


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