how to flush phentermine out of your system

How to Flush Phentermine Out of Your System

Phentermine is a prescription medication that’s commonly used to treat obesity. It works as an appetite suppressor and stimulant, which can facilitate weight loss in overweight individuals. However, like other medications, phentermine can cause side effects, and it can also be habit-forming.

If you’re on phentermine and you want to discontinue the medication or you want to cleanse your body of it for any reason, you may be wondering how to flush phentermine out of your system. Below, we’ll discuss the factors that affect how long it takes for phentermine to leave your body and what you can do to speed up the process. We’ll also address frequently asked questions about phentermine detox.

Factors that Affect Phentermine Excretion Time

Several factors can impact how long phentermine stays in your system, including:

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Your metabolism plays a significant role in how quickly your body processes phentermine. People with a faster metabolism typically excrete drugs more quickly than those with a slower metabolism. Other factors that affect metabolism include age, genetics, and body mass index (BMI).


Higher doses of phentermine can take longer to metabolize than lower doses. Your doctor will typically prescribe the lowest effective dose of phentermine, which can help minimize the time it takes for the drug to leave your system.

Frequency and Duration of Use

The longer and more frequently you take phentermine, the longer it will take for the drug to leave your system. Individuals who use phentermine for an extended period may develop a tolerance, which can also slow the excretion process.

Hydration and Urination Frequency

Drinking plenty of water and urinating frequently can help eliminate phentermine from your body more quickly. When you urinate, your body excretes phentermine metabolites, so the more you urinate, the faster the drug will leave your system.

Activity Level

Staying active can stimulate your metabolism and help your body process phentermine more quickly. Exercise has also been shown to improve mood, which can help counteract the mood changes that may occur during phentermine detox.

How Long Does Phentermine Stay in Your System?

The half-life of phentermine is approximately 20 hours. This means that half of the drug is eliminated from your system every 20 hours. Therefore, it typically takes between five to six half-lives for the drug to be fully excreted from your system. In other words, it usually takes around four days for phentermine to completely leave your system.

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However, as we mentioned earlier, other factors can impact phentermine excretion time. For example, if you’ve been taking a high dose of phentermine for an extended period, it may take longer for the drug to leave your body.

Methods for Flushing Phentermine Out of Your System

If you want to flush phentermine out of your system, there are several steps you can take to speed up the process. These include:

Drinking Plenty of Water

As we mentioned earlier, drinking water can help your body excrete phentermine more quickly. Aim for at least 8-ounce glasses of water per day.

Eating a Healthy Diet

Eating a diet rich in fruits, vegetables, and lean protein can help support liver and kidney function, which can aid in drug elimination. Avoid processed foods and foods high in sodium, as these can negatively affect your body’s detoxification processes.

Exercising Regularly

Regular exercise can help improve your body’s overall function and stimulate your metabolism, which can aid in drug elimination.

Urinating Frequently

As we discussed earlier, urination is how your body eliminates phentermine metabolites. Try to urinate frequently, ideally every two to three hours.

Getting Plenty of Rest

Getting adequate rest can help reduce stress on your body and support its natural detoxification processes.

Avoiding Alcohol and Other Drugs

Alcohol and other drugs can negatively impact your body’s ability to metabolize phentermine and eliminate it from your system. If you’re detoxing from phentermine, it’s best to avoid these substances until the drug has been fully excreted from your body.

FAQs: Flushing Phentermine Out of Your System

Can I speed up phentermine excretion time?

Yes, you can speed up phentermine excretion time by staying hydrated, exercising regularly, eating a healthy diet, and getting plenty of rest.

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How long does it take for phentermine to leave your system?

It typically takes around four days for phentermine to completely leave your system. However, other factors (such as dosage, frequency of use, and metabolism) can impact excretion time.

Is it possible to fail a drug test for phentermine even after detoxing?

It’s possible to fail a drug test for phentermine even after detoxing if the test is highly sensitive. This is because small amounts of phentermine metabolites can remain in your system for several weeks after use.

What are the side effects of phentermine detox?

Common side effects of phentermine detox include fatigue, hunger, and mood changes. These typically subside within a few days or weeks. Talk to your healthcare provider if you experience severe or persistent side effects.

Is it safe to detox from phentermine on your own?

Detoxing from phentermine should be done under the supervision of a healthcare provider to ensure safety and efficacy. Your provider can monitor your health and help manage any withdrawal symptoms you may experience.


Flushing phentermine out of your system can help minimize the risk of addiction or dependence and make it easier to discontinue the medication. By staying hydrated, exercising regularly, eating a healthy diet, and avoiding alcohol and other drugs, you can speed up the drug’s excretion time and support your body’s natural detoxification processes. If you have questions or concerns about phentermine detox, talk to your healthcare provider.

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