Does Phentermine Show Up On A Drug Test: A Comprehensive Guide For Diet Pill Users

Jordan Barnett | Masters in Chemical Engineering
Jordan Barnett | Masters in Chemical Engineering

Over 15 years of experience dodging drug tests.

Does Phentermine Show Up On A Drug Test?

Yes, but it doesn’t always show up as phentermine. When you’re taking phentermine, drug test results might indicate that you have amphetamine in your system. This is because phentermine is a stimulant with a chemical composition similar to that of amphetamine.

Unfortunately, amphetamines are considered some of the most widely abused drugs in the United States, with side effects like psychosis, paranoia, and even hostility. Knowing this, many employers are extra vigilant in their screening processes. And though you can always contest a false positive result with a more thorough drug screen, some employers would rather lose candidates than risk hiring someone with a drug problem.

So how can you continue using phentermine without potentially losing job prospects? With the right tools, you can pass any drug test with flying colors. Here, we’ll talk about two proven methods that’ll help you keep your test results clean and free of any red flags.

Phentermine capsules

How Does A Urine Drug Test Work?

In the United States, the most common type of drug testing procedure is the 5 panel urine drug test. This tests for the presence of THC (marijuana), cocaine, opiates, phencyclidine, and amphetamine in one’s system. Depending on the industry or the level of the position you’re applying for, you may have to undergo a more comprehensive drug testing procedure that identifies benzodiazepines, barbiturates, quaaludes, and other illegal or regulated substances as well.

The first test is called an immunoassay screen, which involves the use of five (or more) panels or strips containing antibodies that can detect the presence of the aforementioned substances.

If you test positive for amphetamine, you have two options: provide a doctor’s prescription indicating you’re on phentermine, or undergo a second drug test called the gas chromatography-mass spectrometry (GC-MS), which identifies metabolites. This test will clear the air on any false positives for amphetamine use.

Now, if you don’t have a prescription to take phentermine pills, you’re in a bit of hot water since they are prescription drugs. Despite being sold primarily to aid in weight loss, phentermine is considered a controlled substance as it is, after all, still a stimulant and can become highly addictive. In fact, even if you do have a prescription for phentermine, you can still be questioned for having large amounts of the phentermine drug in your system. 

How To Pass A Phentermine Drug Test

Phentermine has a half-life of about 16 to 31 hours, and can be detectable for around four to seven days by the standard five-panel urine test. If you take more than your recommended dose, it may stay in your system for much longer. But even with over a week to prepare for your drug test, users are advised against abruptly stopping your use of the phentermine drug to avoid experiencing withdrawal – especially if you’ve been taking it for a long time.

In this scenario, your best bet would be to use a synthetic urine solution which can mimic the composition of real urine. But you have to use one that will raise zero suspicions – or else you can kiss your future job goodbye. One tried and tested option is Clear Choice Sub-Solution. Having been around for over 15 years now, Clear Choice is the pack leader in synthetic urine.

There are quite a number of things that make Clear Choice so reliable. Firstly, its formula uses 11 different chemical compounds, including ones that are present in human urine, such as urea and uric acid. Second, it’s free of biocide, a preservative so common in synthetic urine that most labs already know to test for this specific ingredient. Third, each kit comes with a heat activator formula that brings the solution’s temperature up to normal body temperature.

To find out more about Clear Choice, check out our Best Synthetic Urine buyer’s guide!

Is It Possible To Detox From Phentermine?

If you have a bit of time to prepare for a drug test another reliable way to pass a phentermine drug test is with a detox program, which can flush out all traces of phentermine, amphetamine, and other substances from your system.

With detox programs, you’ll want to go as natural as possible. This is why Toxin Rid is such a popular choice – using only a blend of herbs, minerals, and vitamins, this brand cleanses your urine, blood, and saliva of toxins without help from animal products, fillers, or synthetics.

Toxin Rid’s 10 Day Detox is recommended for those who have been exposed to certain substances for extended periods, from amphetamines to prescription drugs like phentermine weight loss pills. The three-part program comes with pre-rid tablets to be taken for the first nine days, a detox liquid to be taken two hours after the last pill, and a dietary fiber to be taken an hour before the drug test.

To find out more about Toxin Rid, check out our best detox pills for drug test review here!

Don't Let False Positives Hamper Your Chances Of Getting A Job

If your goal is to lose weight and you have a doctor’s prescription, it’s perfectly legal to take phentermine. Unfortunately, with a chemical composition that closely resembles amphetamines, this prescription drug raises a bunch of red flags for would-be employers.

For phentermine users, perhaps the best way to avoid any trouble is to make sure the drug doesn’t show up on tests at all – false positive or not. With our top picks for synthetic urine and detox programs, you’ll have one less thing to worry about when applying for a job.