One of our most usual questions at PharmacistAnswers is concerning how long a particular drug stays in the human body for. There really often isn't a clear reduced answer yet we definitely can make a great estimate based upon what us know about drug metabolism as well as the special, of the drug in question. See listed below for our recent question and answer about the weight loss medicine phentermine.

You are watching: How long does phentermine stay in your blood


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Phoebe asked

How long does phentermine continue to be in your system? when will that stop showing up in a urine test?

Answer

While girlfriend don"t mention in your inquiry what strength of phentermine you took, it doesn"t influence the answer much, if in ~ all. The component of the medicine profile we room going to look at to determine how long it remains in your system is "half-life". "Half-life" simply refers to the moment it takes the human body to metabolize 50% that the drug. In other words, for every half-life, 50% of the drug remaining the human body is reduced. We have shown this below:

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While the fifty percent life of a particular drug is really indicative of just how long the medicine is detectable, over there are other variables have the right to influence the lot of time a drug stays detectable consisting of the type of test being used, whether or not the drug has actually detectable metabolites, size of time making use of the drug etc... So keep in mental that half life is however one factor.

For phentermine specifically, it has been mostly figured out that the drug is detectable top top a typical urinalysis test for about 5-6 fifty percent lives.The half-life that phentermine in the human body is roughly 19-24 hours.So theoretically, phentermine will be detectable for around 5-6 days, based upon the test that is gift used.​>Below, we have consisted of some basic data​ concerning phentermine and also how the is metabolized in the body:

Administration

Phentermine is administered through mouth. There are no injectable formulations the the drug. The does not issue if the medicine is provided with food or an empty stomach as that does not influence the properties of the drug.

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Metabolism

Phentermine is generally excreted by the kidneys. The remove half-life ranges 19—24 hours as mentioned over in the article and also slightly is affected by urinary pH. One acidic atmosphere lends the half-life to decrease to about 7—8 hours. Following administration, many absorption that phentermine occurs from the tiny intestine. The expression of action following management of the 8 mg capsules or tablet computers is around 4 hours and also 12—14 hours after management of the 30 mg capsules or the 37.5 mg tablets.