How Long Does Phentermine Stay in Your System? | Online Meds Guru

How Long Does Phentermine Stay in Your System?

Phentermine (Adipex) is a prescription drug that is given to help overweight people and works by lowering appetite and is usually prescribed by the doctor for three weeks to lose weight for people who exercise and eat low-calorie foods.

Phentermine has a half-life of about 20 hours, which takes half the dose to be digested by the liver or excreted unchanged in the urine, so it takes five to six half-lives for the Adipex to be removed entirely. 

The exact timing is not specified, but after the Adipex dose, you can get it by a blood test for up to 24 hours.

You can get phentermine in the Urine test after 1-4 days. Some form of test is done, advising to take phentermine a week before the urine drug test.


Phentermine will stay in the plasma for four to six hours. Blood tests can determine the difference between phentermine abuse or proper use as prescribed by a doctor. Adipex is detected via a blood test for up to 24 hours.


phentermine is available for one to four days by SAMSHA5-panel’s amphetamine test. Home tests are usually enough to show the presence of a drug in the urine. A positive result requires each person to send a sample to the laboratory for further testing.


Depending on the length of the hair, phentermine can be detected up to 90 days after swallowing, and hair testing may be the most reliable test for early phentermine use. However, they may not detect recent or occasional drug use. Get Adipex for a few months.

However, the drug travels from the bloodstream to the hair follicles detected within seven to 10 days after taking it.


Oral fluid tests can detect phentermine from 24 to 4 hours after intake. They can see the parent drug rather than its metabolites and can notice same-day use in some cases. Saliva tests are noninvasive, and it is easy to collect samples.

How does it work?

Phentermine is an anorectic, a drug used to suppress a patient’s diet. Reduce your sense of hunger and thus limit the number of calories you consume. A low-calorie diet can lead to weight loss.

Although the Adipex method remains unclear, suspected that it increases the levels of neurotransmitters in your brain. When levels of dopamine, serotonin, and norepinephrine increase to a certain level, they suppress and suppress your sense of hunger, which should promote weight loss

What is phentermine’s prime use?

Phentermine is a prescribed medication used with a doctor-approved exercise, behaviour change, and reduced-calorie diet program to help you lose weight and used by certain overweight people, such as those who are obese or have weight-related medical problems.

Doctors worldwide prescribe phentermine for those people with a BMI (body mass index) of more than 30 percent. this is medically considered dangerous for a person because the stiffness of the heart and blood vessels can lead to death, and phentermine pills should be taken with proper diet, exercise, and more. Dietary and behavioural modification, no one should use phentermine for more than ten weeks.

What are the Symptoms of overdose?

Phentermine has stimulating properties and can affect neurotransmitters, including dopamine, norepinephrine, and serotonin. This is very similar to amphetamines. For this reason, prescription drugs are strictly controlled and are usually only allowed for a short time and not recommended for people with a history of substance abuse disorders.

Some of the most severe side effects of Adipex include high blood pressure, heart rate, restlessness, dizziness, tremors, insomnia, shortness of breath, chest pain, and swelling of the legs and ankles.

Phentermine overdose symptoms, on the other hand, may include:

  • 1-Confusion
  • 2-Panic
  • 3-Hallucinations
  • 4-Extreme restlessness
  • 5-Nausea

How long does Phentermine stay in your system?

The half-life of a drug is the amount of time it takes for a portion of the digested dose by the liver or, in some cases, excreted consistently in the urine.

Phentermine shares 20 hours of half-normal life; however, the elimination of Adipex in the system takes a 5-6 half-life.

Efficiency. The usual dose of phentermine is 37.5 mg in the morning before breakfast. Out of these phentermine pills, about 80 percent of the active ingredient phentermine hydrochloride is excreted with the urine in an unchanged manner.

How long does it take to feel phentermine effects?

In its function, phentermine is similar to amphetamines because of its ability to stimulate the central nervous system, suppress appetite, and raise blood pressure.

This drug is used in the form of a tablet or once in the morning in the form of a long-lasting capsule.

It teaches its high concentration in the blood 3 to 4 hours after being absorbed through the digestive tract, at which point the effects of the drug are evident.

Some of the phentermine’s short-term effects might include:

  • Lessened appetite
  • Hyperactivity
  • Chest pressure or pain
  • Euphoric sensation
  • Irritability or anxiety

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