
Diet pills are prescription weight loss medications, also known as anti-obesity medication. They are meant for chronic weight management but contain ingredients that may be habit-forming and have a high potential for abuse. To prevent misuse, the DEA categorizes them into different controlled substance schedules. Active drugs in most weight loss pills are similar to amphetamines (stimulants). Prescription weight loss pills fall into one of three categories: not controlled, Schedule III controlled substance, or Schedule IV controlled substance.
| Characteristics | Values |
|---|---|
| Controlled substance schedules | Schedule III, Schedule IV, Schedule V |
| Diet pills included in schedules | Benzphetamine, Phendimetrazine, Phentermine-topiramate, Phentermine, Diethylpropion, Qsymia, Belviq, Contrave, Orlistat, Saxenda |
| Side effects | Rapid or irregular heartbeat, mood changes, cognitive changes, nausea, vomiting, diarrhoea, constipation, abdominal pain, psychosis, psychological dependence, trouble sleeping, dizziness, restlessness, pulmonary hypertension, valvular heart disease, slowed thinking, affected vision, unusual spotting |
| Diet pills use cases | Chronic weight management, serious health issues due to excess body weight, weight loss with diet and exercise |
| Diet pills limitations | High potential for abuse, may interfere with vitamin absorption, may worsen certain health conditions, may interact with medications, may not be suitable for children or adolescents |
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What You'll Learn

Diet pills and their addictive nature
Diet pills, also known as weight-loss medications, are prescription drugs or over-the-counter supplements designed to help users reduce or control their weight. They encompass various prescription drugs, such as Benzphetamine, Phendimetrazine, Phentermine-topiramate, and Diethylpropion, which fall under Schedule III or IV controlled substances due to their potential for abuse. These substances are regulated by the DEA to prevent misuse and are meant to be used alongside a healthy diet and exercise regimen.
The active drugs in most weight loss pills are similar to amphetamines, which are stimulants that increase energy and performance while reducing appetite. Diet pills produce similar effects, including increased energy, feelings of euphoria, and physical dependence, which can lead to addiction. The addictive nature of diet pills is influenced by biological, environmental, and psychological factors, such as home life, peers, age of first use, and the method of consumption.
The side effects of diet pill abuse include increased heart rate, raised blood pressure, restlessness, insomnia, and, in severe cases, stroke, liver damage, and gastrointestinal issues. Additionally, diet pills can cause mental health issues such as anxiety, depression, and the development or exacerbation of eating disorders. The potential for addiction is heightened when individuals become dependent on the pills to manage their weight, creating a false sense of control. This can lead to a vicious cycle where users feel they cannot function without the drugs, and the long-term abuse of these medications can have destructive consequences on the body and mind.
Furthermore, diet pills are often misused without medical supervision, leading to dangerous side effects and health risks. Some individuals may start taking diet pills with a specific weight loss goal in mind, but they become obsessed with the results and want to lose more weight, making it challenging to stop using the pills. This can result in social isolation, shame, and insecurities, further exacerbating mental health conditions and increasing the risk of addiction.
Overall, while diet pills may seem harmless, they have the potential for abuse and addiction, and their use should be carefully monitored by healthcare professionals to ensure safe and effective weight management.
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Controlled substance schedules
Diet pills are prescription weight loss medications, also known as anti-obesity medication. They are meant for chronic weight management but contain ingredients that may be habit-forming and have a high potential for abuse. To prevent misuse, the Drug Enforcement Administration (DEA) categorises them into different controlled substance schedules.
Controlled substances are medications that can cause physical and mental dependence, and the manufacturing, possession, and use of these substances are regulated. The DEA categorises substances into one of the five schedules based on their accepted medical use in the US, their relative abuse potential, and the likelihood of causing dependence when abused.
Schedule I drugs have the highest potential for abuse and can cause severe psychological and/or physical dependence. They have no currently accepted medical use and are often referred to as illicit or "street" drugs. Examples of Schedule I substances include heroin, lysergic acid diethylamide (LSD), marijuana (cannabis), peyote, methaqualone, and 3,4-methylenedioxymethamphetamine ("Ecstasy").
Schedule II drugs also have a high potential for abuse and can lead to severe dependence. Schedule III drugs have a lower misuse potential than Schedule I and II drugs, and they may cause physical dependence but more commonly lead to psychological dependence. Medications in this category are often used for pain control, anesthesia, or appetite suppression. Examples of Schedule III substances include benzphetamine, ketamine, phendimetrazine, and anabolic steroids.
Schedule IV drugs have a lower potential for abuse and a lower risk of dependence. Examples include Xanax, Valium, and Tramadol. Schedule V drugs have the least potential for abuse and consist of preparations containing limited quantities of certain narcotics, such as cough medicines with codeine.
Prescription weight loss pills can fall into one of these categories: not controlled, Schedule III controlled substance, or Schedule IV controlled substance. Examples of Schedule III diet pills include Benzphetamine (Didrex) and Phendimetrazine (Adipose, Anorex-SR, Statobex). Schedule IV diet pills include Phentermine-topiramate, Phentermine, and Diethylpropion.
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Side effects of prescription appetite suppressants
Prescription appetite suppressants can have side effects, and these differ depending on the type of medication. It is important to note that there is little evidence that appetite suppressants are safe and effective. While some medications have been approved by the FDA, others are used off-label, meaning their safety and effectiveness for the individual taking them is uncertain.
Some of the side effects of prescription appetite suppressants are generally mild and temporary, but they may get worse if eating high-fat foods. For example, orlistat users should be on a low-fat diet (less than 30% of daily calories from fat) as it can cause digestive issues such as constipation, abdominal pain, and indigestion. Orlistat can also cause vitamin deficiencies, as it makes it temporarily harder for the body to absorb vitamins A, D, E, and K. In rare cases, severe liver injury has been reported by people taking orlistat, but it is unclear if the drug was the cause.
Other appetite suppressants can cause more serious side effects, including allergic reactions, problems with the gallbladder, kidneys, or pancreas, blurred vision, increased heart rate, and suicidal thoughts. Short-term prescription appetite suppressants can also cause rapid or irregular heartbeat (tachycardia or arrhythmia) and delirium. Appetite suppressants can also worsen certain health conditions, such as high blood pressure, mood disorders, and glaucoma.
It is important to talk to a healthcare provider before taking any prescription appetite suppressant, especially if you are pregnant or breastfeeding, and to be aware of any potential side effects. If you experience any unpleasant or dangerous side effects, you should consult your healthcare provider.
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Natural alternatives to diet pills
Diet pills are prescription weight-loss medications, also known as anti-obesity medication. They are meant for chronic weight management but contain ingredients that may be habit-forming and have a high potential for abuse. The DEA categorizes them into different controlled substance schedules. Active drugs in most weight loss pills are similar to amphetamines (stimulants).
- Fenugreek
- Green tea
- Yerba mate
However, there is no good evidence that natural supplements aid weight loss. While some herbs and supplements may help with short-term weight loss, they are ineffective in the long term and may even be harmful. Guar gum, for example, has been associated with esophageal and small bowel obstruction. Garcinia cambogia has been linked to hepatic failure requiring transplantation.
Natural appetite suppressants may also be risky. While they claim to control cravings and curb appetite, there is little evidence that they work. Eating and weight are complex, and a "hunger suppressant pill" is unlikely to be effective.
Some natural alternatives to diet pills include:
- Increasing protein intake
- Reducing refined carbohydrate intake
- Avoiding unnecessary liquid calories
- Using apps to log meals, track exercise, or receive support from weight-loss coaches
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Safety and effectiveness of weight-loss pills
Diet pills, also known as weight-loss pills, anti-obesity medication, or appetite suppressants, can be habit-forming and have a high potential for abuse. They are prescription weight-loss medications, though some are available only by injection. Doctors may prescribe these medications to patients with serious health issues caused by excess body weight or who have not lost significant weight through diet and exercise. Diet pills should be used in conjunction with, not as a replacement for, diet and exercise.
The US Drug Enforcement Administration (DEA) categorises diet pills into different controlled substance schedules based on their accepted medical use in the country. Schedule III controlled substances, such as Benzphetamine and Phendimetrazine, have a higher risk for abuse than Schedule IV substances. Schedule IV controlled substances include Phentermine-topiramate, Phentermine, and Diethylpropion. Drugs in Schedule III are more likely than those in Schedule IV to cause drug dependence.
Prescription appetite suppressants can help with weight loss for people with obesity by lessening their appetite or making them feel full faster. They are most effective when combined with a reduced-calorie eating plan and regular physical activity. Short-term prescription appetite suppressants require more caution due to possible severe side effects and addiction potential. Side effects of short-term prescription appetite suppressants that are controlled substances include rapid or irregular heartbeat, mood changes, cognitive changes like agitation or delirium, nausea, vomiting, diarrhoea or constipation, and abdominal pain. Long-term prescription appetite suppressants are generally safe if taken as prescribed.
The Food and Drug Administration (FDA) has approved the following prescription appetite suppressants for long-term use: Liraglutide (Saxenda), Semaglutide (Wegovy), Naltrexone-bupropion (Contrave), and Phentermine-topiramate (Qsymia). A 2022 study of 175 individuals who took Semaglutide showed an average weight loss of 5.9% at three months and 10.9% at six months. A larger study published in the New England Journal of Medicine showed an even greater average loss of 14.9%. However, drawbacks of Semaglutide include high cost, side effects, and the long-term to indefinite length of treatment.
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Frequently asked questions
Diet pills are prescription weight loss medications. They are also called anti-obesity medication. Diet pills are meant for chronic weight management and are meant to be used with a reduced-calorie diet and exercise plan.
Diet pills are controlled substances and can be categorised as Schedule III or Schedule IV controlled substances. Schedule III controlled substances include Benzphetamine and Phendimetrazine. Schedule IV controlled substances include Phentermine-topiramate, Phentermine, and Diethylpropion.
Diet pills can have several side effects, including a fast heart rate, high blood pressure, trouble sleeping, dizziness, and restlessness. They can also cause mood changes, such as depression or anxiety, and cognitive changes like agitation, delirium, or psychosis.
Yes, there are natural alternatives to diet pills, such as GLP-1 receptor agonist medications like Wegovy and Ozempic, which are popular for weight loss. However, prescriptions for these medications are often limited.
Diet pills can be habit-forming and may cause physical and mental dependence. They may also have severe side effects and interact with other medications. It is important to consult a doctor before taking diet pills, especially if you have any underlying health conditions.











































