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What is Phentermine?

Phentermine is a similar drug like amphetamine, whereas its brand name is Ionamin. Phentermine online is a medication to treat obesity and used together with exercise. However, it is a short-term oral medication. 

However, it belongs to the group of drugs called anorectics. It works by decreasing the craving for food. Moreover, It comes in the form of an oral pill usually taken by mouth once daily in the morning before breakfast. Besides, you can also take it with or without a meal. 

The common side effects of Phentermine online include dry mouth, increased heart rate, insomnia, and dizziness. However, after taking a dose, do not drive or operate heavy machinery until you know how the drug affects you.

How Does Phentermine Work?

Phentermine stimulates the (nerves and brain) central nervous system. Effecting these increases the heart rate and blood pressure and decreases the appetite. The medication is used together with diet and daily exercise to treat obesity. It is primarily for people with risk factors such as high cholesterol, high blood pressure, or diabetes

Important Information 

Do not use Phentermine online medication if you are allergic to it or during pregnancy/breastfeeding. However, it may cause life-threatening side effects for the child (fetus). Also, do not use the medication along with the alcohol.

Moreover, make a list of all the products that you use and give it to the doctor. Doing so, you can also lessen the possibility of interactions.

Do not use Phentermine if you have (or had):

  • Glaucoma (narrow/open-angle);
  • Overactive thyroid;
  • Agitation;
  • A past of drug or alcohol abuse; 
  • Severe heart diseases;
  • Coronary artery disease; or,
  • If taken an MAO inhibitor in the past 14 days or less. However, a dangerous drug interaction can occur with this.

Before starting the medication also tell your doctor if you have::

  • A family history of heart problems/issues;
  • Uncontrolled blood pressure/nerves;
  • Overactive thyroid;
  • If you are taking other diet pills; or
  • Extreme nervousness

How long does Adipex (Phentermine) stay in your system?

Generally, the average half-life of the Phentermine is 20 hours. Which means it takes half of the dosage to eliminate from the body through urine. However, it takes six half-lives to get entirely off from the body. 

The phentermine capsule contains the active ingredient, namely hydrochloride. As it’s 70 to 80% is discharged in the urine maintained. The remainder undergoes N-oxidation and N-Hydroxylation to form similar metabolites.

In blood: For about 24 hours after the last consumption. (can be detected by a blood test). 

In hairs: It can be detected in the hairs for several months. 

Factors that may affect the detection time

The detection of the amount of Phentermine and how long it stays in the system depends on various factors such as:

Age: In elderly metabolism takes a more extended period.

Dosage: If someone is taking the medication off-label or without a prescription, it will stay longer in the system.

Metabolism: In an average built metabolism person, it expects to present in urine for 3 to 5 days. However, it may stay longer in an aged/elder person.

However, if you are taking the medication with a prescription, then it is not a problem that it can be detected in a test. 

Dosage Information

Usual Adult dosage for obesity: Phentermine 8mg in divided dose three times a day or before a meal; 


Phentermine 15mg to 37.5mg orally once a day before taking breakfast.

Note: Take the medication for a short-term, or on the doctor’s prescription/advice only.

Initial pediatric dosage for obesity (17 years or older): Phentermine 8mg three times daily before taking the meal. You can take medicine before 1 or 2 hours of a meal. 

However, the Safety and efficiency of Phentermine have not been established for the patients under 17 years.

How to take Phentermine?

Always take the dose exactly as prescribed by the doctor. Follow all the instructions given by him.

Do not double the dose if you somehow forget it; take them precisely on time. Or take the dose before 1 or 2 hours of breakfast. However, use the medication for a short period.

If you missed your dose accidentally, take it soon as possible; if it is the time for the schedule one, skip the missed one.

Call the doctor/physician if you think that drug is not working well; however, he will guide you.

Additionally, do not suddenly stop the medication; ask the doctor first. And he will gradually lessen your doses to prevent you from fatal side effects.

Side Effects

Along with the positive effects, Phentermine may also cause side effects if it is abuse or overdose. However, it can cause primary pulmonary hypertension and sometimes fatal side effects. 

Pulmonary hypertension is a disease in which the pressure on the arteries in lungs gets increases or causing more stress on your heart. Moreover, it may lead to heart failure or sudden death. 

It may also cause shortness of breath or lightheadedness during substantial activity. 

The side effects symptoms include:

  • Swelling in ankle and leg;
  • Dizziness/Tiredness;
  • Increased size of the abdomen; 
  • Weakness/High blood pressure;
  • Fast heartbeats;
  • Insomnia;
  • Lips or skin gets blue; 
  • Pain or pressure in the chest;
  • Rashes/Diarrhea;
  • Tremors; or,
  • Constipation.

The side effects of Phentermine online should not tolerate more. Consult your expert or pharmacist frequently to confirm that the medication is working well or not. However, seek emergency medical service if you experience side effects.

You may also call 911 for emergency medical service/help. Report your symptoms to the FDA if they are getting worse.