
Prescription diet pills are medications that aid weight loss in people with obesity or those who have a high body mass index (BMI) and weight-related health issues such as high blood pressure or type 2 diabetes. They are also known as anti-obesity medication or appetite suppressants. While they can be effective, they are not a replacement for a healthy diet and exercise. Some prescription diet pills are controlled substances, meaning they can cause physical and mental dependence. However, this does not necessarily make them narcotics. For example, phentermine, a common prescription diet pill, is a stimulant with a similar structure to amphetamines, but it is not a narcotic.
Are Prescription Diet Pills a Narcotic?
| Characteristics | Values |
|---|---|
| Definition | Prescription diet pills are prescription weight-loss medications. They are also called anti-obesity medications. |
| Use | Diet pills are used to treat obesity, which is defined as a body mass index (BMI) of 30 or higher. They can also be prescribed to adults with a BMI of 27 or greater who have weight-related health problems such as high blood pressure or type 2 diabetes. |
| Mechanism | Diet pills work by suppressing appetite and making users feel full faster. They may also make it harder for the body to absorb fat from food. |
| Effectiveness | Studies show that prescription diet pills help people achieve an average weight loss of 5% or more of their starting body weight. |
| Types | Prescription diet pills include appetite suppressants, orlistat (Xenical), liraglutide (Saxenda), phentermine-topiramate (Qsymia), semaglutide (Wegovy), benzphetamine (Didrex), diethylpropion (Tenuate), phendimetrazine (Prelu-2), and phentermine (Adipex-P, Pro-Fast). |
| Narcotic Status | Phentermine, a common ingredient in prescription diet pills, is not a narcotic. Narcotics act on opioid receptors, while phentermine is a stimulant similar to amphetamines. |
| Controlled Substance Status | Phentermine is a controlled substance due to its potential for abuse and dependence. It is classified as a Schedule IV controlled substance. |
| Side Effects | Side effects of prescription diet pills may include mild gastrointestinal issues, rare cases of severe liver injury, and interference with other medications such as birth control pills and blood thinners. |
| Cost | The cost of prescription diet pills varies, with Xenical costing around $800 for a 1-month supply, while generic versions and over-the-counter alternatives are cheaper. |
| Lifestyle Considerations | Diet pills should be used in conjunction with a reduced-calorie eating plan and regular physical activity for effective weight loss and maintenance. |
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What You'll Learn

Phentermine is a stimulant, not a narcotic
Phentermine is a prescription weight-loss medication. It is a Schedule IV controlled substance, which means it can be misused and cause dependence. However, the potential for dependence and abuse is lower with phentermine than with other stimulants or narcotics. Phentermine is chemically similar to amphetamine and acts as a norepinephrine-dopamine releasing agent (NDRA). It stimulates norepinephrine and epinephrine release and suppresses appetite. It is not a narcotic because it does not act on opioid receptors. Narcotics are used to treat moderate to severe pain.
Phentermine is a stimulant that increases brain norepinephrine and dopamine levels, producing stimulant, rewarding, and appetite suppressant effects. It is commonly prescribed for people with obesity, defined as having a body mass index (BMI) of 30 or higher. Phentermine is typically recommended when modified eating plans and increased exercise have not resulted in weight loss. It is important to note that phentermine is intended to be used in conjunction with, not as a replacement for, diet and exercise.
Phentermine is available as a generic medication and was the 149th most commonly prescribed medication in the United States in 2022, with over 3 million prescriptions. It is approved for short-term use of up to 12 weeks, and most weight loss occurs within the first few weeks. While it can be effective for weight loss, it also carries risks of side effects such as a fast heart rate, high blood pressure, trouble sleeping, dizziness, and restlessness. More serious side effects may include abuse, and there have been rare reports of cardiovascular events such as stroke, angina, and cardiac arrest.
Phentermine interacts with other medications, including selective serotonin reuptake inhibitors (SSRIs) and monoamine oxidase inhibitors (MAOIs). It is not recommended for use during pregnancy or breastfeeding due to unknown safety concerns. Additionally, people taking phentermine may experience impairment when driving or operating machinery, and consuming alcohol with phentermine may lead to adverse effects. Overall, while phentermine can be a useful tool for weight loss under medical supervision, it is important to be aware of its potential side effects and interactions.
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Prescription diet pills are for people with obesity
Prescription diet pills are medications that aid weight loss for people with obesity. Healthcare providers recommend these pills to individuals with a body mass index (BMI) of 30 or higher. Providers may also recommend diet pills to individuals with a BMI greater than 27 who have weight-related health issues such as type 2 diabetes, high blood pressure, high cholesterol, or joint pain.
Diet pills are not a replacement for diet and exercise. Instead, they are meant to be used alongside a reduced-calorie eating plan and regular physical activity. Some medications may help you feel less hungry or full sooner, while others may make it harder for your body to absorb fat from the foods you eat.
The U.S. Food and Drug Administration (FDA) has approved several prescription diet pills for long-term use, including Liraglutide (Saxenda), Semaglutide (Wegovy), Naltrexone-bupropion (Contrave), and Phentermine-topiramate (Qsymia). Other FDA-approved prescription diet pills are for short-term use only, typically up to 12 weeks, including Benzphetamine (Didrex, Regimex), Diethylpropion (Tenuate, Tenuate Dospan), Phendimetrazine (Prelu-2), and Phentermine (Adipex-P, Pro-Fast).
It is important to note that prescription diet pills are not narcotics. While narcotics act on opioid receptors to treat moderate to severe pain, diet pills are stimulants that can cause physical and mental dependence.
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Diet pills are also called anti-obesity medication
Diet pills, also called anti-obesity medication, are prescription weight-loss drugs. They are typically recommended for people with a body mass index (BMI) of 30 or higher, or a BMI greater than 27 with obesity-related conditions such as type 2 diabetes, high blood pressure, high cholesterol, or joint pain. These medications are meant to be used in conjunction with, not as a replacement for, a healthy diet and regular exercise.
There are various types of anti-obesity medications, including prescription appetite suppressants, which work by reducing hunger or increasing feelings of fullness. Examples of FDA-approved prescription appetite suppressants include liraglutide (Saxenda), semaglutide (Wegovy), naltrexone-bupropion (Contrave), and phentermine-topiramate (Qsymia). Qsymia is one of the most potent prescription weight loss pills available, with 75% of participants in one study achieving a 5% weight loss. Other FDA-approved prescription appetite suppressants, such as benzphetamine (Didrex, Regimex) and diethylpropion (Tenuate, Tenuate Dospan), are intended for short-term use only.
The history of anti-obesity medication includes the use of thyroid hormone, which was found to have modest effectiveness and produced side effects such as palpitations and difficulty sleeping. Amphetamines, introduced in the late 1930s, were popular for weight loss due to their appetite-suppressing effects and increased alertness. However, in the 1960s, several deaths linked to diet pills triggered stricter regulations and the banning of certain pills.
Today, the US Food and Drug Administration (FDA) approves anti-obesity medications as adjunctive therapy for individuals who have not achieved sufficient weight loss through lifestyle changes alone. The FDA considers therapies that result in weight loss of at least 5% of body weight over six months, predominantly from fat mass. While anti-obesity medications can be beneficial, experts caution that their side effects may outweigh the benefits in some cases. Therefore, it is crucial to consult a healthcare professional before taking any weight management medication.
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Diet pills are controlled substances
Diet pills are prescription weight-loss medications, also known as anti-obesity medication. They are typically recommended for individuals with a body mass index (BMI) of 30 or higher, or a BMI greater than 27 with other related health problems, such as high cholesterol, heart disease, or Type 2 diabetes. While diet pills can aid in weight loss, they should be used alongside a healthy diet and regular exercise, rather than as a replacement.
Some diet pills are controlled substances, which means they have the potential for misuse and can lead to physical and mental dependence. The Drug Enforcement Administration (DEA) categorizes controlled substances into five schedules based on their accepted medical use, safety, and abuse potential in the United States. Diet pills that are controlled substances include:
- Phentermine-topiramate (Qsymia) - a Schedule IV controlled substance. It is considered a potent prescription pill for weight loss and has a dependence potential similar to alprazolam (Xanax), clonazepam (Klonopin), and diazepam (Valium).
- Benzphetamine (Didrex, Regimex) - a Schedule III controlled substance. It has a higher risk for abuse than Qsymia and may lead to moderate or low physical dependence or high psychological dependence.
- Phendimetrazine Prelu-2, Adipose, Anorex-SR, Statobex - a Schedule III controlled substance. It is similar to phentermine but is prescribed less often.
- Phentermine (Adipex-P) - a Schedule IV controlled substance. It is available in both generic and brand name versions for individuals aged 17 and older.
It is important to note that not all diet pills are controlled substances, and they vary in their potential for abuse and dependence. It is always advisable to consult with a healthcare professional before taking any prescription medication, including diet pills, to ensure safe and effective use.
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Diet pills are not a replacement for diet and exercise
Diet pills, also known as weight-loss pills or appetite suppressants, are prescription medications for people with obesity (a body mass index, or BMI, over 30). They work by blocking or increasing specific hormones, neurotransmitters, and/or peptides to reduce hunger or make you feel full faster. While these pills can be beneficial for weight loss, they are not a replacement for a healthy diet and regular exercise. Here's why:
First, it's important to understand that diet pills are not a "one-stop-shop" solution for weight loss. They are meant to be used alongside a healthy diet and regular exercise, not as a replacement. In fact, healthcare providers typically recommend appetite suppressants only when modified eating plans and increased physical activity alone have not achieved the desired weight loss. This is because a healthy diet and exercise routine offer a more holistic approach to weight loss and overall health.
Second, diet pills can have side effects and are not risk-free. While they may provide modest benefits, these pills are not suitable for everyone. Some people may experience health problems or negative interactions with other medications. Additionally, certain diet pills can be habit-forming and may lead to physical and mental dependence, similar to narcotics. As such, it is crucial to consult a healthcare provider before taking any diet pills to ensure safe and effective use.
Third, weight loss is about more than just achieving a certain number on a scale. A healthy diet and exercise routine provide numerous additional benefits beyond weight loss. For example, exercise releases dopamine, the "happy chemical," which can boost your mood and help relieve anxiety and symptoms of depression. It also improves your physical capabilities and enhances brain function by supporting the hippocampus, which is crucial for memory and learning.
Finally, sustainable weight loss is often about making small but consistent changes to your daily routine and developing healthy habits. This includes increasing your water intake, eating a balanced and nutrient-dense diet, and engaging in physical activities that you enjoy. These lifestyle changes can lead to substantial results and improve your overall health and wellness, rather than just focusing on a quick fix. Remember, there is no magic pill for weight loss, and the healthiest approach is a combination of a healthy diet, regular exercise, and behavioural modifications.
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Frequently asked questions
Prescription diet pills are weight loss medications for people with obesity, defined as a body mass index (BMI) of 30 or higher. They are also prescribed to people with a BMI of 27 or higher who have weight-related health problems such as high blood pressure or type 2 diabetes.
No, prescription diet pills are not narcotics. Narcotics act on opioid receptors and are used to treat moderate to severe pain. Prescription diet pills are stimulants that affect how the body and brain experience appetite and hunger.
Prescription diet pills, also known as appetite suppressants, work by blocking or increasing specific hormones, neurotransmitters, and/or peptides. They make you feel less hungry or full faster when you eat, helping you take in fewer calories and lose weight.
Some examples of prescription diet pills include Liraglutide (Saxenda), Naltrexone-Bupropion (Contrave), Phentermine-Topiramate (Qsymia), Benzphetamine (Didrex), and Orlistat (Xenical).











































