Why Does Phentermine Cause Constipation?

Phentermine causes constipation by slowing down the movement of the digestive system. This medication can lead to infrequent bowel movements due to its effects on the gastrointestinal tract. Phentermine, the popular weight loss medication, can have an unwanted side effect: constipation.

This happens because the drug slows down the movement of the digestive system, resulting in infrequent bowel movements. While it’s great for assisting weight loss, the effects of Phentermine on the gastrointestinal tract can lead to discomfort and difficulty passing stool.

We will explore why Phentermine causes constipation and how you can manage this side effect to ensure a comfortable weight loss journey.

Read More: Will a Warm Bath Help with Constipation?

Understanding Phentermine

Phentermine is a medication commonly used for weight loss. It works by suppressing appetite and increasing metabolism.

Common Side Effects Of Phentermine

Phentermine, a widely prescribed weight loss medication, can, unfortunately, lead to constipation as a common side effect. While Phentermine offers effective appetite suppression, its impact on the digestive system can result in slowed bowel movements and difficulty passing stool. This connection between phentermine and constipation results from the drug’s stimulant-like properties, which can cause dehydration and decreased bowel motility.

It is essential for individuals taking Phentermine to take steps to prevent and alleviate constipation, such as increasing their water intake, eating a fiber-rich diet, and engaging in regular physical activity. Over-the-counter remedies, like stool softeners or laxatives, can offer temporary relief.

Understanding and being prepared for possible side effects is crucial when using Phentermine as part of a weight loss plan, allowing individuals to address potential constipation concerns and achieve their desired results.

Mechanism Of Constipation Caused By Phentermine

Phentermine, a medication used for weight loss, can lead to constipation due to its effects on the gastrointestinal system. This drug affects how the body processes food, which impacts bowel movements. Phentermine can slow food movement through the intestines, leading to constipation.

This occurs because Phentermine stimulates the release of certain hormones that reduce appetite and increase feelings of fullness. However, these hormones can also affect the muscles in the digestive tract, causing them to contract less frequently. As a result, stool remains in the intestines longer, making it harder, drier, and more difficult to pass.

It is important for individuals taking Phentermine to be aware of this potential side effect and to take measures to prevent or alleviate constipation.

Read More: Does a Heating Pad Help with Constipation?

Factors Contributing To Phentermine-Induced Constipation

Phentermine can cause constipation due to several factors, including dehydration. The medication’s diuretic effect increases urine production, potentially leaving the body with insufficient water to soften stool. This lack of hydration can result in difficulty passing bowel movements.

Additionally, phentermine-related constipation is a result of diet and nutrition. The drug’s appetite-suppressing properties may lead to reduced food and fluid intake, further contributing to constipation. Ensuring adequate water consumption is crucial to counteracting these effects. A high-fiber diet that includes fruits, vegetables, and whole grains can also help maintain regular bowel movements.

Maintaining a balanced diet rich in fibrous foods and staying hydrated are key components of managing phentermine-related constipation.

Tips To Relieve Phentermine-Induced Constipation

Phentermine, a popular weight loss medication, can sometimes lead to constipation. To alleviate this side effect, there are several tips you can follow. First, stay hydrated by drinking plenty of water throughout the day. This helps to facilitate smooth bowel movements.

Additionally, make dietary changes such as incorporating more fiber-rich foods like fruits, vegetables, and whole grains into your meals. Fiber adds bulk to your stools and promotes regularity. Including probiotic-rich foods like yogurt or a probiotic supplement can also aid digestion and prevent constipation.

Physical activity can stimulate bowel movements, so try to engage in regular exercise. Finally, if constipation persists, consult with your doctor for further advice. These tips can effectively relieve phentermine-induced constipation and maintain a healthy digestive system.

Seeking Medical Assistance For Phentermine-Related Constipation

Phentermine, a popular weight loss medication, can cause constipation as a side effect. If you’re experiencing constipation while taking Phentermine, seeking medical assistance is important. Consulting a healthcare provider is crucial to addressing this issue. They can guide when to seek treatment options for phentermine-induced constipation.

Your healthcare provider will assess your symptoms and determine the best action. They may recommend lifestyle changes or prescribe medication to alleviate constipation. Following their advice and seeking medical assistance will help manage the discomfort and ensure a smoother experience with Phentermine.

Remember to contact your healthcare provider whenever you have concerns about phentermine-related constipation.

How to take phentermine 37.5 for best results?

Phentermine is a prescription medication commonly used for short-term weight loss with diet and exercise. Here are some general tips that individuals might consider when taking phentermine 37.5 for potentially better results:

  1. Follow Doctor’s Instructions: Always adhere to your healthcare provider’s instructions and dosing recommendations. Phentermine should be taken exactly as prescribed.
  2. Timing: Typically, Phentermine is taken once a day in the morning before breakfast to avoid potential sleep disturbances due to its stimulant effects. Avoid taking it late in the day to prevent insomnia.
  3. Dosage: Phentermine 37.5 mg is a standard dose, but your doctor may adjust the dosage based on your needs and tolerance. Never alter the dosage without consulting your healthcare provider.
  4. Avoid Skipping Doses: Consistency is key. Skipping doses can impact the effectiveness of the medication. If you miss a dose, follow your doctor’s instructions on taking it later or skipping it entirely.
  5. Hydration: Drink plenty of water throughout the day. Staying hydrated can support weight loss and overall well-being.
  6. Healthy Diet: While on Phentermine, maintain a balanced and healthy diet rich in fruits, vegetables, lean proteins, and whole grains. Avoid excessive consumption of high-calorie, sugary, or fatty foods.
  7. Regular Exercise: Incorporate regular physical activity into your routine. Consult your healthcare provider before starting an exercise program, especially if you have any underlying health conditions.
  8. Monitor Side Effects: Be aware of potential side effects such as increased heart rate, dry mouth, nervousness, etc. If you experience any adverse effects, contact your healthcare provider.
  9. Avoid Alcohol: Alcohol consumption can amplify some of the side effects of Phentermine and may negatively impact weight loss efforts.
  10. Short-Term Use: Phentermine is generally prescribed for short periods (a few weeks to a few months) due to its potential for dependence and tolerance. Your doctor will determine the appropriate duration of use.
  11. Regular Check-ins: Your healthcare provider may schedule regular check-ins to monitor your progress, adjust your treatment plan, and address concerns.

Frequently Asked Questions On Why Does Phentermine Cause Constipation

Why Does Phentermine Cause Constipation?

Phentermine is believed to cause constipation due to its stimulant effect on the gastrointestinal tract, which can slow down bowel movements. Additionally, the medication can reduce appetite, leading to fewer meals and less fiber intake, contributing to constipation.

It is important to stay hydrated and incorporate fiber-rich foods into your diet while taking Phentermine to help alleviate this side effect.

How Long Does Constipation From Phentermine Last?

Constipation caused by Phentermine is typically temporary and should resolve within a few days to a week. However, if constipation persists for a longer period or becomes severe, it is important to consult with your healthcare provider. They may recommend adjusting your dosage or other remedies to alleviate the discomfort.

What Can I Do To Relieve Constipation While Taking Phentermine?

To relieve constipation while taking Phentermine, you can incorporate more fiber-rich foods, such as fruits, vegetables, and whole grains. Staying hydrated is also essential, as dehydration can exacerbate constipation. Establishing a regular toilet routine and engaging in light exercise to stimulate bowel movements may be helpful. If necessary, your healthcare provider may suggest over-the-counter laxatives or stool softeners.

Does phentermine make you pee?

Yes, phentermine can lead to an increase in urinary frequency. This side effect occurs due to the stimulant properties of phentermine, which can stimulate the nervous system and potentially affect the bladder’s functioning, causing some individuals to experience more frequent urination while taking the medication. It’s important to note that individual reactions to medications can vary, and not everyone who takes phentermine will necessarily experience this side effect. If you have concerns or questions about the side effects of phentermine, it’s best to consult with a healthcare professional.

Does phentermine cause cancer?

There is no conclusive evidence to directly link phentermine, a prescription weight loss medication, to causing cancer. However, like any medication, phentermine may have potential side effects and risks that should be discussed with a healthcare professional before use. It’s important for individuals considering phentermine to have a thorough conversation with their doctor about their medical history and any potential concerns. For the most up-to-date and accurate information, it’s recommended to consult a medical professional or refer to recent medical research.

Can phentermine cause hemorrhoids?

There is no direct evidence to suggest that phentermine, a medication commonly used for weight loss, directly causes hemorrhoids. However, some individuals taking phentermine might experience side effects like constipation or changes in bowel habits due to its effects on appetite suppression and metabolism. These factors could potentially contribute to developing or exacerbating hemorrhoids, as constipation and straining during bowel movements are known risk factors. If you are concerned about hemorrhoids or any side effects while taking phentermine, it’s advisable to consult a healthcare professional for guidance and proper management.

Does phentermine cause dehydration?

Yes, phentermine can potentially cause dehydration as a side effect. Phentermine is a stimulant medication commonly used for weight loss, and it can affect the body’s water balance by increasing metabolism and reducing appetite. This can lead to an increased rate of water loss through increased sweating and reduced fluid intake due to decreased appetite. It’s important for individuals taking phentermine to stay adequately hydrated by drinking plenty of water and monitoring their fluid intake, especially if they are engaging in physical activity or experiencing excessive sweating. If any signs of dehydration, such as dry mouth, dark urine, or dizziness, are observed, it’s advisable to consult a healthcare professional.

Can you take Dulcolax with phentermine?

 Dulcolax is a laxative used to relieve constipation, while phentermine is a prescription medication often prescribed for weight loss. Since these are different types of medications with different purposes, it’s important to consult a healthcare professional before considering any combination of medications, including Dulcolax and phentermine. They can provide personalized advice based on your medical history, current medications, and specific health needs to ensure your safety and well-being.


To sum up, Phentermine can significantly impact bowel movements, leading to constipation for some individuals. The medication works by suppressing hunger signals in the brain, which can also affect the digestive system. While not everyone experiences constipation while taking Phentermine, it is important to be aware of this potential side effect.

If you are constipated while taking the medication, you can take steps to alleviate the discomfort. Drinking plenty of water, increasing fiber intake, and staying active can all help to promote regular bowel movements. Additionally, talking to your healthcare provider about potential alternatives or adjusting the dosage may be beneficial.

It is essential to prioritize your overall health and well-being while taking Phentermine, and addressing any gastrointestinal issues promptly can contribute to a more positive experience with the medication.

Read More: Can you Take Phentermine Every other Day and Still Lose Weight?

Leave a Reply