You may be interested in learning how long phentermine can last in your system. This medication may be metabolized rapidly and does stay in the body for a while, but sometimes it can take longer.

Blood and hair tests may be used to screen drugs in a variety of ways. The way the medication presents itself in various bodily areas, however, may vary. So, other components may provide different outcomes.

In this article, we’ll look at the medication phentermine and learn how it affects several bodily systems. In addition, we’ll address the query, “How long does phentermine stay in your system?”

What Exactly is Phentermine?

What  is Phentermine

A prescribed weight-loss medication called phentermine may help those who have a medical need to shed pounds. It is available as tablets and capsules that doctors and other medical experts recommend. After a few weeks of using these medications, you may cut down on the dosage and cease feeling as hungry.

In order to avoid cardiac difficulties, blood pressure issues, glaucoma, and an overactive thyroid, phentermine should only be used temporarily. If you have a history of abusing addictive substances, you should avoid using phentermine.

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Why do people use phentermine drugs?

Any doctor may prescribe phentermine medicines since they are successful at helping people lose weight, which makes them useful for treating obesity.

In situations of obesity-related cardiac or health issues, this medicine should only be administered by medical specialists when the weight might interfere with the body’s normal function. In order for a doctor to prescribe phentermine to you if your cholesterol levels are high, you may need to lose weight.

Since phentermine has an addictive potential, it shouldn’t be used on a long-term basis. Take these phentermine medications on a regular basis and follow a diet and exercise regimen. Some users of this medication do so without a prescription, which is harmful to their health.

How long does phentermine stay in your system, according to science?

The brain regularly releases a big quantity of certain molecules as a result of phentermine. Releases of feel-good chemicals including dopamine, serotonin, and norepinephrine are indicative of this. These may aid in decreasing hunger and promoting weight loss.

Dopamine and serotonin are only two of the numerous substances that phentermine may make the brain produce. Others who have these substances in their brains may help you eat less by reducing your appetite.

This may help you start losing weight rapidly when paired with exercise and a nutritious nutrition plan. Because the body uses chemicals to release hormones via the blood, this causes a response that prevents you from taking the medicine. The often asked question, “How long does phentermine stay in your system?” hopefully has an answer by now.

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Phentermine side effects

This medicine will become addicted if you consume more of it. Following the removal of the prescription from your diet, this may result in a quick weight increase. As a consequence, it may take between 24 and 72 hours to evaluate the medicine’s results, and it may take up to five days for the drug to depart the body.

Blood tests to check for phentermine

Every drug stays in the system for a while, and although some drugs are digested rapidly, others could take longer. This medication picks up differently in different parts of the body. As with blood and hair, they will thus be more noticeable in certain areas than in others.

Phentermine medication withdrawal symptoms?

It’s possible for phentermine to have side effects, many of which are painful and unpleasant. they could be,

  • Having chest pain
  • Ankle and foot swelling
  • Skipped pulse and chest fluttering
  • ears that are pounding
  • having difficulty breathing
  • sleeping difficulties
  • Unexpected mood swings

Other withdrawal symptoms from drugs might include itchiness, stomach ache, dry mouth, constipation, and a sour taste in your tongue.

The body’s response to producing less happy hormones may possibly be the cause of the adverse effects. Stress eating and increased weight gain may occur as a consequence.

Frequently Asked Questions

Can phentermine build up in the body over time?

Phentermine can take three to five days to start working, and it may not work as well in the first few weeks after you take it.

What are the negative affects of taking phentermine for a longer time?

If you take phentermine for a long time, you might get chest pain, be less able to exercise, and have a fast, rough, or racing heartbeat or pulse.

How long does the daytime dose of phentermine work?

The results of the work can be seen in three to four hours, but it may take a couple of weeks before you start to notice that you are losing weight.

Can phentermine cause lasting damage?

The thyroid gland works harder when you take phentermine. This raises the amount of hydroid hormone, which can cause glaucoma or a rise in eye pressure.


It is possible to lose weight with the use of the medication phentermine. Most of the time, this medication works by causing the body to release feel-good chemicals like serotonin. By minimizing emotional eating and hunger, as well as by maintaining your overall health, this may aid in weight reduction.

This blog explores the topic of how long does phentermine stay in your system?. We have also warned that the medicine may be addictive, thus it may take some time to get used to work or life after stopping the drug since withdrawal symptoms may occur.


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