
Diet pills, also known as weight management or weight loss medications, are prescription or over-the-counter drugs that claim to help people lose weight. They typically work by suppressing appetite, reducing hunger cravings, and increasing feelings of fullness. While some pills are designed for short-term use, typically up to 12 weeks, others are intended for long-term or indefinite use. It is important to note that the decision to take diet pills should be made in consultation with a healthcare professional, as they can have side effects and may interact with other medications. Additionally, lifestyle changes, including healthy eating habits and physical activity, are crucial components of any weight management program and should not be replaced solely by diet pills.
| Characteristics | Values |
|---|---|
| How long to take diet pills for | This depends on whether the drug helps you lose weight and keep it off, and whether you experience serious side effects. |
| How long to take prescription appetite suppressants for | Prescription appetite suppressants are typically for short-term use, up to 12 weeks (three months). |
| How long to take weight management medication for | Weight management medication is most effective when combined with a healthy eating plan and exercise. On average, after one year, adults who take prescription medications as part of a lifestyle program lose 3% to 12% more of their starting body weight than those who do not take medication. |
| How long to take weight loss medication for | If you lose weight with new drugs, you will likely need to keep taking the medications indefinitely to keep the weight off. |
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What You'll Learn

Appetite suppressants
There are prescription and over-the-counter (OTC) appetite suppressants available. Prescription appetite suppressants can be used for long-term or short-term weight management, depending on their effectiveness in helping you lose weight and maintain that weight loss, as well as the presence or absence of serious side effects. It is important to note that prescription appetite suppressants are not meant to replace physical activity and healthy eating habits but should be combined with a reduced-calorie diet and increased physical activity for optimal results.
Some prescription appetite suppressants are approved by the FDA for short-term use, typically up to 12 weeks (three months). Examples include Benzphetamine, Diethylpropion, Phendimetrazine, and Phentermine. These short-term appetite suppressants are controlled substances with addiction potential, and their misuse or overuse can lead to serious side effects. Therefore, it is crucial to discuss your medical history and any medications you are currently taking with your healthcare provider before starting these medications.
While some healthcare professionals may prescribe appetite suppressants for longer periods, there is limited research on their long-term safety and effectiveness. Long-term use of these medications may carry health risks, and they should not be taken indefinitely without medical supervision. Additionally, certain individuals with specific health conditions, such as heart disease, uncontrolled high blood pressure, glaucoma, hyperthyroidism, liver disease, or a history of eating disorders, are advised against taking appetite suppressants due to potential contraindications and adverse effects.
It is important to consult your healthcare provider before taking any weight management medication, including appetite suppressants. They can help assess your individual needs, recommend the most suitable medication, monitor side effects, and adjust the treatment plan as needed.
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Prescription diet pills
Some prescription diet pills are approved by the FDA for short-term use, typically up to 12 weeks (three months). These include Benzphetamine (Didrex®, Regimex®), Diethylpropion (Tenuate®, Tenuate Dospan®), Phendimetrazine (Prelu-2®), and Phentermine (Dipex-P®, Atti-Plex P®, Pro-Fast®), among others. These short-term appetite suppressants are controlled substances with addiction potential, and their use should be carefully monitored by a healthcare provider.
The duration of prescription diet pill usage depends on various factors, including the individual's weight loss progress, the presence of serious side effects, and the specific medication prescribed. If an individual loses enough weight to improve their health and does not experience significant side effects, a healthcare professional may advise them to continue the medication indefinitely to maintain their weight loss. However, if the individual does not lose at least 5% of their starting weight after 12 weeks on the full dose, it is typically recommended to discontinue the medication or explore alternative treatments.
It is important to note that prescription diet pills are usually recommended for individuals with a body mass index (BMI) of 30 or higher, or a BMI of 27 or higher if they have weight-related health conditions. The decision to use prescription weight management medications should be made in consultation with a healthcare professional, considering factors such as medical history, current health issues, and other medications.
Additionally, prescription diet pills should be combined with a healthy eating plan and regular physical activity for optimal results. Studies show that these medications work best when integrated into a comprehensive treatment plan that addresses lifestyle and behavioural changes. Furthermore, certain medications may have specific instructions, such as Orlistat, which is typically taken with each main meal containing fat or up to one hour after the meal.
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Side effects
Diet pills, also known as appetite suppressants, are a type of weight-loss medication for people with obesity (a body mass index or BMI of over 30). They work by affecting how your body and brain experience appetite and hunger, making you feel less hungry or full faster after eating less food.
While they can be effective in aiding weight loss, they can also have several side effects, especially if used outside of their intended, prescribed use. Here are some of the potential side effects of diet pills:
Short-term prescription appetite suppressants:
- Rapid or irregular heartbeat (tachycardia or arrhythmia)
- Mood changes, such as depression or anxiety
- Cognitive or mental changes like agitation, delirium, or psychosis
- Nausea and vomiting
- Diarrhea or constipation
- Abdominal pain
- Addiction
Long-term prescription appetite suppressants:
Long-term prescription appetite suppressants are generally considered safe if taken as prescribed. However, they may interact with other medications, including antidepressants and anti-anxiety drugs. They can also worsen certain health conditions, such as high blood pressure, mood disorders, and glaucoma.
Weight-loss drugs like Wegovy and Ozempic:
- Gastrointestinal problems, such as nausea, diarrhea, vomiting, constipation, abdominal pain, bloating, and gas
- Headache
- Fatigue
- Indigestion
- Dizziness
- Diabetes eye complication called retinopathy
- "Wegovy or Ozempic face," referring to weight loss in the face, resulting in a gaunt appearance
Phentermine and topiramate:
- Difficulty sleeping if taken in the evening
- Unusual spotting or unexpected vaginal bleeding with oral contraceptives
- Slowed thinking and movements
- Affect on vision
- Interaction with alcohol, making side effects worse
It is important to note that the side effects of diet pills can vary depending on the specific medication and individual factors. Always consult with a healthcare professional before taking any diet pills or appetite suppressants to ensure they are safe and appropriate for you.
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Weight loss drugs
Prescription appetite suppressants can help with weight loss for people with obesity (a body mass index, or BMI, over 30). They work by lessening your appetite or making you feel full faster after eating less food. As a result, you may take in fewer calories and lose weight. However, it is important to note that appetite suppressants do not work on their own. Studies show that they are most beneficial when combined with a reduced-calorie eating plan and regular physical activity. Some common prescription appetite suppressants include Phentermine-topiramate (Qsymia®), Benzphetamine (Didrex®, Regimex®), Diethylpropion (Tenuate®, Tenuate Dospan®), Phendimetrazine (Prelu-2®), and Phentermine (Dipex-P®, Atti-Plex P®, Pro-Fast®). These short-term appetite suppressants are controlled substances and have the potential for addiction, so it is important to follow your doctor's instructions carefully.
The duration for which you take weight loss drugs depends on various factors, including the medication's effectiveness in helping you lose weight and maintain that weight loss, as well as the presence of any serious side effects. If you have successfully lost weight and are not experiencing any severe side effects, your healthcare provider may advise you to continue taking the medication indefinitely to maintain your weight loss. On average, adults who combine prescription medications with a lifestyle program lose 3% to 12% more of their starting body weight after one year compared to those in a lifestyle program without medication.
It is important to note that weight loss drugs are not a replacement for physical activity and healthy eating habits. They work best when used in conjunction with a healthy diet and exercise regimen. Additionally, always consult your healthcare provider before starting any weight loss medication to discuss potential risks and benefits, especially if you have any medical conditions or are taking other medications.
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Healthy eating and exercise
Diet pills, or appetite suppressants, are a type of weight-loss medication for people with obesity (a body mass index, or BMI, over 30). They affect how your body and brain experience appetite and hunger, making you feel less hungry or full faster after eating less food.
It is important to note that appetite suppressants do not work on their own. They are most beneficial for weight loss when combined with a reduced-calorie eating plan and regular physical activity. Some appetite suppressants are approved by the FDA for short-term use, typically up to 12 weeks, while others can be prescribed for longer periods. However, there is limited research on the safety and effectiveness of long-term use. If you are considering taking diet pills, it is important to consult with your healthcare provider to discuss the possible risks and benefits and determine the appropriate duration of use.
Now, let's shift our focus to healthy eating and exercise, which are crucial components of a holistic approach to weight management and overall health. Here are some guidelines to help you incorporate healthy eating habits and regular physical activity into your lifestyle:
Healthy Eating Habits:
- Eat a well-balanced diet: Include a variety of nutrient-rich foods from all the food groups to ensure you get the necessary calories and nutrients to fuel your daily activities and exercise.
- Choose a variety of fruits and vegetables: Opt for different colours to get a diverse range of vitamins, minerals, and antioxidants. Aim to fill half your plate with fruits and vegetables at every meal, as recommended by the United States Department of Agriculture.
- Include lean protein: Protein is essential for building and repairing muscles. Choose lean protein sources that are low in saturated and trans fats, and limit your intake of red and processed meats.
- Opt for healthy fats: Include unsaturated fats in your diet, as they can help reduce inflammation and provide essential fatty acids and calories to fuel your body during exercise.
- Practice portion control: Be mindful of your portion sizes to ensure you're not consuming more calories than you need.
- Plan your meals: Prepare nutrient-rich meals that fit your budget and preferences. This helps you make healthier choices and avoid less nutritious options.
- Eat a healthy breakfast: Start your day with a nutritious breakfast. Include fibre and protein-rich foods to keep you energised and satiated throughout the morning.
Regular Physical Activity:
- Incorporate regular exercise: Engage in physical activities that you enjoy and that suit your fitness level. This can include walking, jogging, swimming, yoga, or any other form of movement that gets your body active.
- Combine cardio and strength training: Include both cardiovascular exercises and strength training in your routine. Cardio helps improve your cardiovascular health and endurance, while strength training helps build and tone your muscles.
- Start slowly and gradually increase intensity: Begin with moderate-intensity workouts and slowly increase the intensity and duration as your fitness level improves. This helps your body adjust and reduces the risk of injury.
- Find an exercise buddy: Working out with a friend or joining a fitness group can help keep you motivated and consistent with your exercise routine.
- Make it a daily habit: Aim to be active every day, even if it's just a 30-minute walk or a gentle yoga session. Consistency is key to maintaining a healthy fitness routine.
Remember, combining healthy eating habits with regular physical activity is a sustainable and holistic approach to weight management and overall health. It's important to consult with a healthcare professional or a dietician to tailor a plan that suits your specific needs and goals.
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Frequently asked questions
The length of time you should take diet pills for depends on the type of pill and your individual situation. Some diet pills are approved for short-term use, typically up to 12 weeks, while others can be prescribed for longer periods or even indefinitely. It is important to consult with a healthcare professional to determine the appropriate duration for your specific circumstances.
The side effects of taking diet pills can vary depending on the specific medication. Common side effects may include nausea, constipation, headache, vomiting, dizziness, insomnia, dry mouth, and diarrhea. More severe side effects could include addiction, gastrointestinal problems, and even vision loss or blindness in some cases.
No, diet pills are not a substitute for physical activity and healthy eating habits. Studies show that diet pills work best when combined with a reduced-calorie eating plan and regular exercise. They can help enhance weight loss efforts but should not be relied upon as a standalone solution.
Yes, there are alternative approaches to weight loss beyond taking diet pills. Lifestyle and behavior changes, including healthy eating and increased physical activity, can be effective in managing weight. Additionally, there are injectable treatments, such as Wegovy and Ozempic, which have been shown to aid in weight loss but may cause gastrointestinal side effects.
The decision to take diet pills should be made in consultation with a healthcare professional. They will consider your individual circumstances, medical history, and potential risks and benefits before recommending a treatment plan. It is important to be transparent about any other medications or supplements you are taking to avoid harmful interactions.











































