
Diet pills, also known as appetite suppressants, are a type of weight-loss medication for people with obesity. They work by lessening your appetite or making you feel full faster. While diet pills can be effective in promoting weight loss, they often come with side effects, one of which is bowel issues, including diarrhoea, upset stomach, and constipation. Additionally, some diet pills, such as Alli, specifically target fat absorption, and if users consume too much fat in their meals, they may experience Alli Oops moments, which involve unexpected bowel movements. Aside from diet pills, there are also poop pills, which are capsules containing tiny amounts of human fecal matter, intended to alter the gut bacteria population and impact weight management.
| Characteristics | Values |
|---|---|
| Reason | Fecal microbiota transplant capsules |
| Type of pills | Diet pills, Appetite suppressants, Prescription weight loss drugs |
| Ingredients | Intestinal bacteria from a stool sample of a healthy, lean person |
| Side effects | Poop your pants, Constipation, Diarrhea, Upset stomach, Heartburn, Gas, Oily spotting, Soft stools, Insomnia, Increased blood pressure, Fast heart rate, Restlessness, Drug dependence, Abuse, Withdrawal symptoms, Headache, Dry mouth, Dizziness, Nausea, Vomiting |
| Availability | Over-the-counter, Prescription |
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What You'll Learn

Alli diet pills can cause diarrhoea
Alli (orlistat) is a weight loss medication that can be purchased over the counter without a prescription. It works by blocking the absorption of 25% of the fat in a meal. Alli is intended to be used in conjunction with a reduced-calorie, low-fat diet and an exercise plan.
Alli can cause several side effects, most notably diarrhoea and loose, oily stools. This occurs because the body is getting rid of extra fat that hasn't been absorbed. These side effects may improve as the user adjusts their diet, but they can be managed by eating a low-fat diet, taking a multivitamin, and staying physically active. It is also recommended to stay close to a bathroom when starting Alli to understand how your body reacts.
Other side effects of Alli include gas with oily spotting, an urgent need to go to the bathroom, and more frequent bowel movements. These side effects are more likely to occur if the user consumes more fat in their diet than recommended.
In rare cases, Alli has been linked to severe liver damage. It is important to consult a doctor or healthcare provider before taking Alli, especially if you are taking other medications or supplements, as Alli may interfere with their absorption.
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Appetite suppressants can make you feel full
Diet pills, specifically appetite suppressants, can make you feel full. Appetite suppressants are a type of weight-loss medication (sometimes called diet pills) for people with obesity (a body mass index, or BMI, over 30). They affect how your body and brain experience appetite and hunger. Appetite suppressants can make you feel less hungry or make you feel full faster after eating less food. As a result, you may take in fewer calories and lose weight.
There are many types of appetite suppressants that work in different ways to lessen your appetite or make you feel full faster. Each appetite suppressant has side effects and risks. Your healthcare provider can help you decide if they’re right for you. Prescription appetite suppressants can be for long-term or short-term use. Check with your healthcare provider before using over-the-counter (OTC) diet pills. Some OTC appetite suppressants may interact with medications or cause health problems.
Prescription weight loss drugs such as phentermine and topiramate (Qsymia), bupropion and naltrexone (Contrave) are used for chronic, long-term weight loss, but only if adequate results occur. In general, if a 3% to 4% weight loss has not been achieved after 12 to 16 weeks, long-term treatment is typically stopped. Many stimulant-type weight loss medications like phentermine or diethylpropion are only recommended for short-term use (up to 12 weeks) due to the risk of dependence and other side effects.
The Food and Drug Administration (FDA) has approved the following prescription appetite suppressants for long-term use: Liraglutide (Saxenda), an under-the-skin (subcutaneous) injection medication; Semaglutide (Wegovy), an under-the-skin injection medication; Naltrexone-bupropion (Contrave), a pill; and Phentermine-topiramate (Qsymia), a pill. Other FDA-approved prescription appetite suppressants are for short-term use only — 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, etc.).
It's important to note that appetite suppressants don't work on their own. Studies show that they're most beneficial for weight loss when combined with a reduced-calorie eating plan and regular physical activity. Weight loss medications should be used alongside a low-calorie diet and a doctor-approved exercise plan for best results. In most cases, people will regain some or all of the weight they lost when they stop using weight loss drugs unless they continue with their diet and exercise program. Be sure to talk to your doctor before starting any weight loss program and understand that it will take time and discipline for permanent results.
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FMT capsules contain human faecal matter
Diet pills, or weight-loss drugs, can cause diarrhoea, upset stomach, heartburn, gas, constipation, and soft stools. These side effects are common and usually subside after the first few weeks. However, it is important to note that weight loss medications should be used in conjunction with a low-calorie diet and a doctor-approved exercise plan for best results. Additionally, it is recommended to consult a healthcare provider before starting any weight loss program or taking diet pills.
Now, let's focus on FMT capsules, which stands for Faecal Microbiota Transplant. These capsules contain human faecal matter, also known as "poop pills" or "crapsules". The idea behind FMT is to transplant intestinal bacteria from a healthy, lean person into the gut of an obese individual, potentially altering their gut bacteria population and metabolism to promote weight loss. While this concept may seem unappealing, it has gained attention as a potential treatment for obesity.
FMT capsules are easy to ingest and can be purchased directly from stool donors or prepared at home. The donor's faecal matter is processed and encapsulated, ensuring no unpleasant odours or tastes. These capsules are designed to dissolve in the gut, releasing healthy bacteria to restore balance to the recipient's microbiome. FMT has shown effectiveness comparable to other methods of faecal microbiota transplantation, and it is often combined with a deep retention enema for optimal results.
FMT is not a new concept and has been used to treat debilitating gastrointestinal infections, such as Clostridium difficile (C. diff), in cases where antibiotic therapy fails. It has also been studied for its potential benefits in treating conditions like Crohn's disease, ulcerative colitis, peanut allergies, and even more diverse applications such as type 2 diabetes, cirrhosis, and HIV. While FMT has shown promising results, it is important to note that the long-term outcomes are still unknown, and there are potential risks associated with the procedure, including the transfer of harmful pathogens.
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Weight loss drugs can cause constipation
Stimulant-type weight loss drugs, such as phentermine (Adipex-P), can cause insomnia, increased blood pressure, a fast heart rate, restlessness, and drug dependence. These drugs are typically recommended for short-term use due to the risk of dependence and other side effects. Bupropion and naltrexone (Contrave), which affect neurotransmitters in the brain, can also lead to constipation, in addition to headaches, dry mouth, dizziness, nausea, and vomiting.
Orlistat (Alli, Xenical) is another weight loss medication that can be used for longer-term weight loss maintenance. While it is effective in interfering with fat absorption, it can cause side effects such as oily spotting, gas, and soft stools. However, these side effects are generally less severe than constipation.
Prescription appetite suppressants are also used for weight loss in individuals with obesity. These medications, including liraglutide (Saxenda) and semaglutide (Wegovy), work by lessening appetite or creating a feeling of fullness after consuming smaller portions. While they can be effective, they may also cause constipation, especially when combined with other medications.
It is important to consult a healthcare provider before taking any weight loss medication to understand the potential side effects and risks. Additionally, increasing dietary fiber and staying well-hydrated can help prevent and manage constipation.
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Bupropion and naltrexone can cause nausea
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 the body and brain experience appetite and hunger, making people feel less hungry or full faster after eating less food. While some are available over the counter, others require a prescription. Bupropion and naltrexone is one such prescription drug combination marketed as Contrave®. It is used to help people lose weight or maintain weight loss. The medication is meant to be taken alongside a reduced-calorie diet and exercise.
In addition, the medication may cause serious skin reactions, which can occur weeks to months after starting the medication. Patients should also be cautious of combining the medication with other drugs, particularly opioids. Taking higher doses of opioid medications or drugs during treatment with bupropion and naltrexone may cause serious injury, coma, or death. Patients should also be aware that the medication may cause high blood pressure and a faster heart rate, as well as angle-closure glaucoma, a condition that can lead to vision loss.
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Frequently asked questions
Diet pills, such as Orlistat (Alli), can lead to oily spotting, gas, and soft stools. Alli users take one pill with every meal and are advised to eat less than 42 grams of fat a day to avoid an "Alli Oops", which is when users experience bowel movements outside of the toilet.
The side effects of diet pills may vary depending on the type of drug and how it works. Stimulant-type drugs like phentermine can lead to insomnia, increased blood pressure, fast heart rate, restlessness, drug dependence, abuse, and withdrawal symptoms. Diet pills that affect neurotransmitters in the brain, such as bupropion and naltrexone (Contrave), can be linked to headaches, dry mouth, dizziness, and stomach side effects like nausea, vomiting, and constipation.
Alternatives to diet pills include making changes to one's diet and lifestyle, such as adopting a low-calorie or gluten-free diet, or following a Paleo or ketogenic diet plan. Intermittent fasting is another alternative that can help regulate bowel movements by increasing the presence of healthy bacteria in the gut. Additionally, fecal microbiota transplant capsules, which contain a tiny amount of human fecal matter, are being studied as a potential treatment for obesity by altering the gut bacteria population.
Prescription appetite suppressants can help with weight loss for people with obesity by lessening appetite or making one feel full faster. Prescription appetite suppressants include Liraglutide (Saxenda), Semaglutide (Wegovy), Naltrexone-bupropion (Contrave), and Phentermine-topiramate (Qsymia). These drugs are typically used in conjunction with a reduced-calorie eating plan and regular physical activity.

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