
Phentermine is a prescription drug used to treat obesity and aid weight loss. It is intended for short-term use alongside a diet and exercise plan. Due to celebrity endorsements, its use has increased dramatically in recent years. Phentermine is chemically similar to amphetamines, which are stimulant drugs known for being abused. This means that phentermine may cause a false positive on a drug test, specifically a 10-panel test, which screens for ten different drugs, including amphetamines. However, a confirmatory drug test would be able to differentiate between phentermine and amphetamine.
| Characteristics | Values |
|---|---|
| Drug type | Prescription medication |
| Drug use | Treat obesity and help with weight loss |
| Drug form | Tablet, capsule, or intravenous solution |
| Side effects | Dry mouth, insomnia, restlessness, dizziness, headache, constipation, diarrhea, chest pain, shortness of breath, confusion, agitation, depression, unusual thoughts or behavior, tremors, uncontrolled muscle movements, difficulty urinating, increased urination frequency at night |
| Safety | Not safe for children, adults over 65, individuals with renal (kidney) impairment, pregnant or breastfeeding women |
| Addiction | Schedule IV controlled substance with addictive qualities |
| Detection | Detected in urine tests, mouth swabs, and hair tests |
| False positive | May cause false positive results for amphetamines |
| Withdrawal | No significant withdrawal concerns with short-term use |
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What You'll Learn

Phentermine is detectable in urine, mouth swab, and hair tests
Phentermine is a prescription medication used to treat obesity and is not an illegal drug. However, it is a controlled substance and can only be legally obtained with a prescription. While phentermine does not show up on a 10-panel drug test, it may be detected in urine, mouth swab (saliva), and hair tests.
Urine Tests
Phentermine is detectable in urine tests for 2 to 7 days after the last dose, with some studies reporting detectability for up to 6 days. The detection period depends on the sensitivity of the test, the individual's metabolism, and the pH of their urine. Under acidic urinary conditions, phentermine may be eliminated from the body more quickly.
Mouth Swab (Saliva) Tests
Saliva drug testing is increasingly popular due to its non-invasive nature and quick turnaround time for results. However, saliva tests may not always detect recent drug use, as drugs may only remain detectable in saliva for a short period. Additionally, improper collection, such as swabbing too deep into the mouth, can lead to contamination and inaccurate results.
Hair Tests
Hair follicle testing involves analyzing a small sample of hair for traces of ingested drugs. This method can detect drug use over a longer period, up to 90 days, compared to urine or saliva tests. Hair follicle testing is considered more reliable due to the difficulty of tampering with hair samples.
It is important to note that phentermine has been known to cause false-positive results for amphetamines on drug tests, leading to potential consequences if not addressed. If an individual is aware of an upcoming drug test and concerned about a false positive, they may consider discontinuing phentermine use temporarily or informing their supervisor and providing proof of their prescription.
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It can cause a false positive for amphetamines
Phentermine is a prescription medication used to treat obesity and aid weight loss. It is a central nervous system stimulant that increases heart rate and blood pressure while decreasing appetite. It is chemically similar to amphetamines, which are stimulant drugs. Due to this similarity in chemical structure, phentermine can cause a false positive for amphetamines on a drug test.
A 10-panel drug test screens for ten different drugs, including marijuana, cocaine, opiates, phencyclidine, amphetamines/methamphetamines, benzodiazepines, barbiturates, methadone, propoxyphene, and Quaaludes. While phentermine itself is not one of the drugs specifically tested for, its similarity to amphetamines can lead to a false positive result. This means that the test may incorrectly indicate the presence of amphetamines when only phentermine was consumed.
False positives can occur with any type of drug screening process due to cross-reactivity between similar compounds. In the case of phentermine, the majority of the active ingredient, phentermine hydrochloride, escapes into the urine, leading to the potential for false positives in urine tests. Urine tests are the most commonly used type of drug test and are considered more reliable than saliva or hair follicle samples due to their higher concentration levels.
It is important to note that a confirmatory drug test, such as GC/MS, can differentiate between phentermine and amphetamine. This type of test is typically performed after an initial positive screening result. Therefore, if an individual is taking phentermine as prescribed and receives a positive test result for amphetamines, they can request a confirmatory test to clarify the situation.
In summary, phentermine can cause a false positive for amphetamines on a drug test due to its chemical similarity to amphetamines and the nature of drug screening processes. However, confirmatory tests can differentiate between the two substances, providing an accurate assessment of an individual's drug use.
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It is not grounds for job removal
Phentermine is a prescription medication used to treat obesity and aid weight loss. It is chemically similar to amphetamines, which are stimulant drugs. Due to this similarity, phentermine may cause a false positive result for amphetamines on a 10-panel drug test. However, this does not necessarily mean that taking phentermine is grounds for job removal.
Firstly, it is important to understand the context in which phentermine is being used. Phentermine is intended for short-term use, usually for a period of 3-6 weeks, and is meant to be used in conjunction with a diet and exercise plan. It is typically prescribed to individuals who are overweight or obese and have other metabolic risk factors, such as high blood pressure, diabetes, or high cholesterol. If an individual is taking phentermine under the supervision of a qualified healthcare provider and has a valid prescription, this can provide clarification and context for a positive drug test result.
Additionally, the impact of phentermine on job performance and safety should be considered. While phentermine can cause side effects such as dry mouth, insomnia, restlessness, and increased heart rate and blood pressure, these side effects may not necessarily impair an individual's ability to perform their job duties. In most cases, taking phentermine as prescribed under medical supervision would not be grounds for job removal.
Furthermore, it is worth noting that drug testing procedures and policies can vary. For example, in the case of military service members, phentermine will not cause a positive result on the confirmation drug test or be reported as positive through the military drug-testing program. It is important for individuals to be aware of the specific policies and procedures related to their employment or industry.
While a false positive result on a drug test may cause initial concern, it is important to remember that further confirmation and differentiation between phentermine and amphetamines can be made through more advanced testing methods. For example, a confirmatory drug test, such as GC/MS, can differentiate between the two substances. Therefore, a positive screening result does not automatically lead to job removal, as further investigation and clarification can be pursued.
In conclusion, while phentermine may show up on a drug test and cause a false positive result for amphetamines, it is not necessarily grounds for job removal. Context, impact on job performance, and the ability to differentiate between substances through advanced testing methods are all important factors to consider. Individuals taking phentermine under medical supervision with a valid prescription can provide this information to their employer, reducing the likelihood of any adverse consequences.
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Detox methods can help flush it out
Phentermine is a prescription medication used to treat obesity and aid weight loss. It is chemically similar to amphetamines, which are stimulant drugs. Due to its chemical composition, phentermine can cause false positive results on drug tests, specifically for amphetamine use.
Detox methods can help flush phentermine out of your system, but it is important to note that there is no quick-fix solution. Here are some ways to support your body's natural detoxification process:
- Hydration: Drinking plenty of water can help flush out phentermine faster. Aim for at least eight glasses of water per day. Water helps your body eliminate toxins by increasing urination frequency.
- Diet: Consume a balanced diet rich in fruits, vegetables, lean proteins, and whole grains. These nutrient-dense foods provide your body with the essential vitamins, minerals, and antioxidants needed to support the detoxification process. Avoid processed foods and sugary snacks, as they can introduce additional toxins into your system.
- Exercise: Regular physical activity helps your body sweat out toxins and boosts your metabolism. Aim for at least 30 minutes of moderate-intensity exercise daily. However, it is important to consult with a healthcare professional before starting an exercise program, especially if you have underlying health conditions.
- Liver and Kidney Support: Your liver breaks down phentermine, and your kidneys help eliminate it. Supporting these organs is crucial. Maintaining adequate hydration and consuming liver-friendly foods, such as garlic, citrus fruits, and green tea, can aid in the detoxification process. Additionally, certain supplements like milk thistle and dandelion root may help support liver function, but always consult a healthcare professional before taking any supplements.
- Medical Detox: Phentermine withdrawal symptoms can be dangerous and severe, so it is essential to undergo a medical detox under the supervision of a qualified healthcare provider. They can guide you through the process and provide necessary support to ensure your safety and well-being.
It is important to remember that the effectiveness of these methods may vary depending on individual factors such as age, metabolism, kidney function, and frequency of phentermine use. The half-life of phentermine is approximately 19 to 24 hours, and it typically stays in your system for an average of four days. However, it can be detected in hair follicle tests for up to 90 days after the last dose.
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It is not known to be habit-forming
Unable to generate an answer as no relevant information was found in the provided sources.
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Frequently asked questions
Yes, phentermine will show up on a drug test, but not directly. Drug tests do not test for phentermine, but they will likely give a false positive result for amphetamines.
Phentermine is a prescription medication used to treat obesity and manage weight. It is an appetite suppressant that decreases hunger and stimulates the central nervous system, increasing heart rate and blood pressure.
Phentermine can be detected in urine tests, mouth swab tests, and hair tests. It is important to note that urine tests are the most commonly used and accurate type of drug test.
In most cases, using phentermine would not be grounds for failing a drug test or losing your job. However, if the medication impairs your ability to perform job duties or compromises your safety, your employer may take action. Providing medical documentation of your phentermine prescription can help clarify the situation.
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