
Diet pills are prescription drugs and over-the-counter supplements designed to help users reduce or control their weight. They are also known as appetite suppressants, anti-obesity medication, or centrally acting anti-obesity preparations. Diet pills work by suppressing appetite, reducing the body's ability to absorb nutrients, increasing metabolism, or preventing fat absorption. While they may seem harmless, they have side effects and can be addictive. Phentermine and topiramate, for example, may cause agitation or restlessness, new or worsening irritability, and aggressive, angry, or violent behaviour. Diet pill addiction can have a destructive impact on the body, and abuse of natural weight loss pills can cause severe damage to health.
| Characteristics | Values |
|---|---|
| Diet pills | Appetite suppressants, anti-obesity medication, anorectic or anorexiant drugs |
| How they work | Suppressing appetite, reducing the body's ability to absorb nutrients, increasing metabolism, preventing fat absorption |
| Side effects | Aggressive, angry, or violent behavior, anxiety, restlessness, difficulty sleeping, addiction, increased energy, feelings of euphoria, agitation, irritability, mania |
| Availability | Over-the-counter or prescription |
| Prevalence | Commonly used, especially among teenage girls and young women |
| Regulation | FDA-approved prescription appetite suppressants for short-term or long-term use; FDA does not regulate over-the-counter diet pills |
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What You'll Learn

Diet pill addiction and abuse
Diet pills are prescription drugs or over-the-counter supplements designed to help users reduce or control their weight. They interfere with bodily processes that affect weight by suppressing appetite, increasing metabolism, or preventing fat absorption. Diet pills are also known as anorectic or anorexiant drugs, appetite suppressants, anti-obesity medication, or centrally acting anti-obesity preparations. Diet pills are widely available and easily accessible, which can lead to their abuse and addiction.
Diet pill abuse and addiction can have severe consequences. The potential for dependence and addiction is higher among individuals with eating disorders or underlying mental health disorders. Diet pill abuse has been associated with specific Axis I (anxiety and alcohol abuse or dependence) and Axis II disorders, acknowledging the co-occurrence of anxious and impulsive traits in individuals with eating disorders. Additionally, individuals with higher BMIs, higher novelty-seeking tendencies, and the presence of anxiety disorders have been found to be more prone to diet pill abuse.
Biological factors, environmental factors, home and family life, peers, age of first use, and method of ingestion are other factors that can influence the development of diet pill addiction. The side effects of diet pill abuse can be detrimental to one's health and well-being. Inpatient and outpatient treatment programs are available to help individuals overcome diet pill addiction and address the underlying causes of their substance abuse.
It is important to recognize the signs of addiction and seek professional help when needed. The Diagnostic and Statistical Manual of Mental Disorders (DSM-5) provides 11 signs of addiction to help individuals identify when diet pill use has become problematic. Healthcare providers can also assist in determining if appetite suppressants are suitable for an individual and provide guidance on potential risks and side effects.
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Side effects of phentermine and topiramate
Diet pills, including prescription and over-the-counter drugs, can have side effects and risks. Phentermine and topiramate are prescription appetite suppressants that are used together for weight loss.
Phentermine is an appetite suppressant that can aid in weight loss and weight management when combined with exercise and a reduced-calorie diet. Phentermine is FDA-approved for weight loss. Some of the side effects of phentermine include high blood pressure, dry mouth, constipation, and changes in libido.
Topiramate is approved for treating migraine and epilepsy, but it can be used off-label for weight loss. This means that the FDA has not approved topiramate for weight loss by itself. Common side effects of topiramate when used for weight loss include a tingling sensation, dizziness, fatigue, and nausea.
When taken together, phentermine and topiramate may cause serious side effects. Call your doctor immediately if you experience any of the following:
- Signs of an allergic reaction, such as hives, difficulty breathing, or swelling in your face or throat
- Severe skin reactions, including fever, sore throat, burning eyes, skin pain, or a red or purple skin rash with blistering and peeling
- Mood or behavior changes, anxiety, panic attacks, trouble sleeping, or feelings of aggression, restlessness, or depression
- Signs of too much acid in your blood, such as loss of appetite, tiredness, thinking problems, or irregular heartbeats
- Diarrhea, constipation, numbness or tingling, dizziness, fatigue, upset stomach, or joint pain
It is important to note that this is not an exhaustive list of side effects, and other reactions may occur. Always follow the instructions provided by your doctor or pharmacist, and do not hesitate to seek medical advice if you have concerns or experience adverse effects.
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Diet pills and eating disorders
Diet pills, also known as appetite suppressants, are prescription or over-the-counter drugs designed to reduce or control body weight. They work by suppressing appetite, increasing metabolism, or preventing fat absorption. While they can be effective in aiding weight loss, they also come with side effects and risks. Diet pills have the potential for abuse and addiction and can be a gateway to eating disorders, especially in young women.
Research from the University of Minnesota found that a significant number of teenage girls engage in unhealthy weight control behaviors, including the use of diet pills. A separate study by Harvard T.H. Chan School of Public Health and Boston Children's Hospital analyzed data from 10,058 women and girls aged 14 to 36. They found that among participants without an eating disorder, those who used diet pills were more likely to receive an eating disorder diagnosis within the next one to three years compared to those who did not use these products. This suggests that diet pill use may be a gateway to disordered eating practices, fostering a dependence on unhealthy coping methods and dysregulating normal digestive function.
The potential side effects and risks of diet pills include increased energy, feelings of euphoria, addiction, and interference with bodily processes that affect weight. They can also interact with medications or cause health problems. It is important to consult a healthcare provider before taking diet pills to assess whether they are right for you and to ensure safe use.
Eating disorders are severe mental illnesses with high mortality rates, frequent relapses, and high treatment costs. Treatment for eating disorders often involves a multidisciplinary approach, including psychological treatments such as cognitive behavioral therapy, nutritional therapy, and medication for co-occurring disorders like anxiety or depression. It is important to seek help from professionals, such as psychologists, registered dieticians, and medical specialists, to ensure safe and effective treatment.
While diet pills may seem like a quick fix for weight loss, they can have negative consequences, especially for those vulnerable to eating disorders. It is crucial to prioritize overall health and well-being, address any underlying mental health issues, and consult with healthcare professionals before considering the use of diet pills.
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Over-the-counter vs prescription diet pills
Diet pills, also known as appetite suppressants, work by blocking or increasing specific hormones, neurotransmitters, and/or peptides. This makes you feel less hungry or full faster when you eat, leading to reduced calorie intake and weight loss. Both over-the-counter and prescription diet pills are available, but they differ in several ways.
Over-the-counter diet pills are readily available without a prescription. However, only one such medication, Alli (orlistat), has been approved by the FDA for weight loss. Orlistat works by preventing the digestion of fat in the body, leading to reduced calorie absorption. Common side effects include an oily discharge from the rectum, flatulence with discharge, increased defecation, and fecal incontinence. Other over-the-counter products are considered supplements and are not regulated by the FDA. As a result, there is limited information available regarding their safety and effectiveness.
Prescription diet pills, on the other hand, are regulated and monitored by healthcare professionals. These medications include Liraglutide (Saxenda), Semaglutide (Wegovy), Naltrexone-Bupropion (Contrave), and Phentermine-Topiramate (Qsymia). Prescription appetite suppressants can be for short-term or long-term use, and they are typically recommended for individuals with obesity, defined as a body mass index (BMI) of 30 or higher. These medications can have side effects, including rapid or irregular heartbeat, mood changes, nausea, and abdominal pain. Additionally, they may interact with other medications and can be addictive if not used as directed. It is important to consult a healthcare provider before taking prescription diet pills to ensure they are safe and appropriate for your individual needs.
While both over-the-counter and prescription diet pills can aid in weight loss, they have distinct advantages and considerations. Over-the-counter pills offer convenience and ease of access, but their effectiveness and safety profiles may vary. Prescription diet pills, while requiring medical supervision, provide a more tailored approach and are generally considered safer when used as directed. It is important to note that diet pills should not be relied upon solely for weight loss. Combining them with a reduced-calorie eating plan and regular physical activity is crucial for optimal results and long-term health benefits.
Regarding the potential side effect of anger, it is important to note that some prescription diet pills, such as Phentermine-Topiramate, may cause mood changes, including agitation, irritability, and aggressive behavior. However, this is not a common reported side effect across all diet pills, and the impact on mood and behavior can vary from person to person. If you experience any unusual changes in mood, including anger, it is important to consult your healthcare provider immediately. They can assess your symptoms and provide guidance on adjusting or discontinuing the medication if necessary.
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Effectiveness of diet pills
Diet pills, also known as appetite suppressants, are prescription drugs or over-the-counter supplements designed to help individuals reduce or control their weight. They work by suppressing appetite, increasing metabolism, or preventing fat absorption. Diet pills are intended for people with obesity (a body mass index or BMI of over 30) to aid in weight loss.
Prescription appetite suppressants can be effective in helping individuals with obesity lose weight. They work by reducing appetite or making individuals feel full faster after eating less food, resulting in a reduced calorie intake. An analysis of 143 studies found that certain prescription appetite suppressants, such as phentermine-topiramate and GLP-1 receptor agonists (liraglutide and semaglutide), were among the most effective medications for weight reduction in people with obesity. The typical body weight reduction with these medications is 6% to 11%.
However, it is important to note that appetite suppressants do not work in isolation. Their effectiveness is enhanced when combined with a reduced-calorie eating plan and regular physical activity. Additionally, each appetite suppressant has its own side effects and risks, which should be discussed with a healthcare provider before starting the medication. Some common side effects of short-term prescription appetite suppressants include rapid or irregular heartbeat, mood changes (such as depression or anxiety), cognitive changes (such as agitation, delirium, or psychosis), nausea, vomiting, diarrhoea, constipation, and abdominal pain.
Over-the-counter diet pills are also available, but they may have side effects and interact with medications or cause health problems. It is recommended to consult a healthcare provider before using OTC diet pills. Some OTC appetite suppressants may be designated for short-term use (up to 12 weeks) and are considered controlled substances due to their potential for addiction and abuse. Examples of FDA-approved prescription appetite suppressants for short-term use include benzphetamine (Didrex®, Regimex®), diethylpropion (Tenuate®, Tenuate Dospan®), phendimetrazine (Prelu-2®), and phentermine (Dipex-P®, Atti-Plex P®, Pro-Fast®).
The effectiveness of diet pills may be influenced by various factors, including biological, environmental, home and family life, peers, age of first use, and method of administration. Diet pill addiction can have destructive effects on the body, and it is important to seek professional help if struggling with diet pill abuse or addiction.
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Frequently asked questions
Diet pills, including prescription weight loss pills, and weight loss supplements, often work by suppressing appetite or reducing the body's ability to absorb nutrients. While they are meant to help with weight loss, they do come with side effects and risks. Phentermine and Topiramate, for example, list aggressive, angry, or violent behavior as a side effect.
Diet pills can have frightening side effects and the potential for abuse and addiction. Diet pills can cause increased energy and feelings of euphoria, which can make addiction more likely. Other side effects include panic attacks, restlessness, irritability, anxiety, and depression.
Diet pills can be addictive. Diet pill addiction can have a destructive impact on the body. Diet pills are designated Schedule III or IV under the Controlled Substances Act to prevent abuse.
Diet pills are not regulated by the FDA, and they can be purchased online and in stores. Diet pills should not be taken without medical advice, and they are not a substitute for a healthy diet and exercise. Diet pills are also associated with eating disorders and unhealthy weight control behaviors.











































