One of our most typical questions in ~ PharmacistAnswers is about how long a details drug remains in the body for. There an extremely often isn't a clear reduced answer but we definitely can make a great estimate based on what we know about drug metabolism and also the special, of the drug in question. See below for our latest question and answer about the weight loss medicine phentermine.

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Phoebe asked

How lengthy does phentermine continue to be in her system? when will it stop showing up in a pee test?


While friend don"t mention in your inquiry what strength of phentermine friend took, it doesn"t influence the answer much, if at all. The component of the medicine profile we are going to look in ~ to determine exactly how long it stays in your mechanism is "half-life". "Half-life" simply refers to the time it bring away the human body to metabolize 50% that the drug. In various other words, for every half-life, 50% the the drug continuing to be the body is reduced. Us have portrayed this below:


While the half life the a certain drug is very indicative of how long the medicine is detectable, over there are other variables deserve to influence the amount of time a drug continues to be detectable including the form of test being used, whether or no the drug has detectable metabolites, length of time making use of the medicine etc... So keep in psychic that fifty percent life is however one factor.

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


Phentermine is administered through mouth. There room no injectable formulations that the drug. It does not issue if the medicine is given with food or an north stomach as that does not influence the properties of the drug.

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Phentermine is generally excreted by the kidneys. The removed half-life ranges 19—24 hrs as mentioned above in the article and also slightly is influenced by urinary pH. One acidic atmosphere lends the half-life to decrease to around 7—8 hours. Following administration, most absorption the phentermine wake up from the tiny intestine. The duration of action following management of the 8 mg capsules or tablets is about 4 hours and 12—14 hrs after administration of the 30 mg capsules or the 37.5 mg tablets.