Does Phentermine Burn Fat or Just Suppress Appetite?

January 9, 2024 |

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This article will discuss appetite reduction and fat-burning properties of phentermine.

Phentermine is often prescribed in weight loss programs due to its anorectic properties, but you may be thinking, does it also makes your body dissolve fats, or is it just an appetite suppressant?

So, yes, phentermine is a mild fat burner because it has some thermogenic properties. However, its main role is hunger suppression which leads to fat loss.

The next section describes how phentermine affects different body systems to minimize appetite and play its role in fat loss.

Also, I have listed some tips that will help you lose weight more quickly while taking phentermine.

Now, let’s get in and find out these detail;

Phentermine for weight loss – How does it work?

Phentermine is one of the most famous anorectic drugs (also called appetite suppressants).

Phentermine does suppress appetite, but it also burns fat. The way it works is by increasing the levels of norepinephrine in the body. This hormone helps to break down stored fat so that it can be used as energy. Phentermine can also help to increase your metabolism, which will help you burn even more calories throughout the day.

It helps you curb your calorie intake by causing a sensation of satisfaction and fullness for longer durations.

While the exact mechanism of phentermine activity is not clear, it is known that it influences your nervous system and endocrinal secretions.

Primarily, it increases the level of a neurotransmitter – dopamine, in the brain by inhibiting its reuptake by neurons.

In turn, high dopamine boosts nor-epinephrine production, which is the stress hormone involved suppression of hunger.

When it comes to the fat-burning properties of the drug, there is not much evidence suggesting that phentermine enhances fat metabolism.

However, research shows that it does have some thermogenic properties that eventually improve metabolic rates.

Yet its usage will make you dissolve fats indirectly by putting your body on energy deficit.

Energy or calorie deficit is a condition when you take in fewer calories than you are using. Hence, your body is forced to use the stored fats to fulfill its energy requirements.

Moreover, it increases the energy expenditure at rest, which also leads to faster fat dissolution.

All in all, phentermine is an effective drug if you are facing difficulty in losing weight because it will minimize your hunger and keep you from binge eating, and its mild thermogenic characteristics will also help you burn fats.

How to lose weight on phentermine fast?

As we just discussed, phentermine will just reduce your urge to eat and will not dissolve a lot of fat by itself.

But you can speed up the fat loss when using phentermine by taking care of a few things and incorporating healthy habits into your lifestyle.

1. Follow the doctor’s advice

Phentermine is not an over-the-counter medicine, and you can only use it for weight loss if your doctor prescribes it.

He would guide when to take the dose and how many doses you should take each day according to your health condition.

You must follow the physician’s guidelines to avoid the potential side effects of phentermine as well.

Also, make sure that you do not overdose because it can lead to hypertension, arrhythmias, and stroke.

2. Don’t skip meals

When using phentermine, it is very tempting to skip meals because you want to lose weight faster and are not feeling the appetite either.

But skipping meals is counterproductive for weight loss.

When you do not eat, your metabolism slows down, and so does the weight loss process.

Moreover, malnutrition is likely to make you weak and sick.

Instead, what you can do to keep yourself healthy and benefit from lesser hunger is eat a well-balanced diet.

Talk to a nutritionist or your doctor about healthy diet plans and make adjustments in your diet accordingly.

3. Workout

Exercise is the best way to lose body weight because increased physical activity causes more calorie consumption and dissolves fat mass faster.

Both cardio and strength exercises help get in shape and maintain a lean body figure.

Because cardio exercises will help you burn more fats and lose weight and strength, workouts will maintain a high metabolic rate, preventing the body from storing fats again.

And when you combine strength training and cardio workouts, you get maximized results.

4. Improve sleep habits

You may be amazed by this, but sleep habits can significantly affect your ability to lose weight.

The better your sleep patterns are, the more effectively you can shed extra pounds on your body.

In contrast, sleep deprivation leads to slower metabolism and delayed fat consumption.

It becomes even more important when going through a weight loss intervention like phentermine therapy.

Results from a study where 123 overweight people were observed during a weight loss program showed that both sleep duration and quality affect fat loss.

Improvement in sleep quality can increase the likelihood of fat loss by as much as 33% when you are dieting.

5. Drink enough water

Drinking more water is a handy tip to enhance weight loss and your overall health as well.

This fact is supported by several scientific studies, including one from the Berlin school of public health.

So, basically, water intake speeds up weight loss in two ways.

Firstly, it improves metabolic rates because most of the body’s metabolic reactions occur in an aqueous medium.

Secondly, water intake induces thermogenesis in the body, speeding up fat loss by many folds.

Hence, when you are dieting with phentermine, drink lots of water to get rid of the stubborn fat.

Recent research revealed that it increases weight loss by up to 30%.

You would be even more surprised to know the efficacy of water-induced thermogenesis.

6. Long-term lifestyle changes

Phentermine therapy is a short-term solution for obesity, and if you do not modify your lifestyle by incorporating healthy habits, you are likely to put on the lost weight back.

Because when the appetite suppressing effect of phentermine is gone, there is nothing to keep you from taking in and storing the bulk of fats again.

That is why several phentermine users have reported weight to regain after quitting phentermine.

Even worst many of them have put on more pounds than before.

Hence, to maintain the smart figure and lesser bodyweight you have achieved with phentermine, you must make lasting lifestyle changes like eating a balanced diet, getting enough sleep, and becoming physically active.

Phentermine how much weight I will lose in a week?

When it comes to how much you can lose on phentermine – you can lose from 1 to 2 pounds a week.

However, the exact weight drop varies from person to person depending upon BMI, gender, health condition, diet, lifestyle habits, how closely you stick to your diet and exercise plan, and how well your body responds to the medication

On average, it is expected that you will lose 3-5% of your initial body weight in 12 weeks when taking phentermine.


Diet pills are a promising solution for people who struggle to lose weight, and phentermine is one of the highly effective drugs out there.

Mainly, it aids in weight loss by making you feel less hungry.

Resultantly, you take in lesser food, and your body is forced to utilize stored fats for energy.

However, its direct role in fat metabolism is quite menial.

Still, you can burn fats and magnify the weight loss activity of phentermine by making healthy modifications in your daily lifestyle like getting proper sleep, staying hydrated, and exercising regularly.

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