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Is Phentermine Speed?

No, Phentermine is not “speed”. Phentermine is a sympathomimetic amine anorectic, meaning that it is a type of stimulant used to reduce appetite in those who suffer from obesity. Speed on the other hand is a slang term used to refer to amphetamines. Although phentermine is chemically similar to amphetamines, it is not treated as such due to its low potential for addiction and abuse, hence its classification as a Schedule IV drug.

The chemical structure of Phentermine


Is Phentermine A Stimulant?

Phentermine is a medication classified as a stimulant, but it differs from other stimulants in terms of its addictive potential and withdrawal effects. It is commonly used as a short-term treatment for weight loss in individuals with obesity.

Phentermine works by stimulating the release of certain chemicals in the brain that help suppress appetite and increase feelings of fullness. This mechanism of action can assist individuals in reducing their caloric intake and achieving weight loss goals.

One key distinction of phentermine compared to other stimulants is that it has a lower potential for addiction and abuse. While it acts as a stimulant, its effects on the brain’s reward system and neurotransmitters are milder compared to other stimulant drugs. This means that the risk of developing dependence or experiencing withdrawal symptoms upon discontinuation is significantly reduced.

However, it is important to note that phentermine can still have side effects and should be used under the guidance of a healthcare professional. Common side effects may include increased heart rate, elevated blood pressure, dry mouth, restlessness, and difficulty sleeping. These effects are typically temporary and subside as the body adjusts to the medication.

It should also be noted that, because of its close chemical structure to amphetamine like substances, phentermine may cause you to test positive for amphetamines in a regular drug test. It is important to notify those administering the drug test of any prescriptions you are taking in order to avoid a negative scenario like being fired from your job.



a bottle of phentermine next to a bottle of adderal

Adderall Vs. Phentermine: What’s The Difference?

Adderall and phentermine are indeed different medications, although they share some similarities. It’s important to note that while I can provide information, consulting with a healthcare professional for specific medical advice is always recommended.

Adderall is a medication that contains amphetamine salts, which are classified as central nervous system stimulants. It is primarily used in the treatment of attention deficit hyperactivity disorder (ADHD) and narcolepsy. The active ingredients in Adderall work by increasing the levels of certain neurotransmitters in the brain, such as dopamine and norepinephrine, which play a role in regulating attention and impulse control.

On the other hand, phentermine is a medication that is chemically related to amphetamines, but it is not exactly the same. Phentermine is primarily used as an appetite suppressant in the management of weight loss in individuals with obesity. It works by stimulating the release of certain neurotransmitters, including norepinephrine, which can help reduce appetite and promote weight loss.

In terms of potency, Adderall is generally considered to be a stronger stimulant compared to phentermine due to its composition of amphetamine salts. Adderall has a broader range of effects on neurotransmitters and is approved for the treatment of ADHD, which involves more complex neurological considerations.

It’s important to recognize that both medications can have potential side effects and should be used under the guidance of a healthcare professional. Side effects of Adderall may include increased heart rate, elevated blood pressure, and potential effects on mood and behavior. Similarly, phentermine may cause side effects such as increased heart rate, dry mouth, restlessness, and difficulty sleeping.


Energized people jumping

Will Phentermine Give You Energy?

Phentermine, being a stimulant medication, can create a sense of increased energy and alertness for individuals who take it. However, it’s important to understand that phentermine, like caffeine, does not actually provide energy in the true sense of the word. Rather, it acts by masking feelings of tiredness and lethargy, giving the impression of enhanced energy levels.

Energy, in the context of our bodies, is primarily derived from the food we consume. When we eat, our bodies break down carbohydrates, fats, and proteins into glucose, which is the primary source of fuel for our cells. Through a complex process, our cells convert glucose into a form of energy called adenosine triphosphate (ATP), which powers various bodily functions.

Phentermine does not directly contribute to this energy production process. Instead, it stimulates certain areas of the brain, increasing levels of certain neurotransmitters such as norepinephrine, which can result in a feeling of heightened alertness and reduced fatigue.

It’s important to note that while phentermine may provide a temporary boost in energy and alertness, it should not be seen as a substitute for proper nutrition and a balanced diet. Adequate energy levels can only be sustained by consuming a well-rounded diet that includes the necessary macronutrients (carbohydrates, fats, and proteins), as well as essential vitamins and minerals.


A clock with smaller clocks bursting out of it

How Long Does Phentermine Last?

Phentermine is a medication with an extended half-life of approximately 20 hours. This means that even after 20 hours of taking phentermine, approximately half of the drug still remains in your system. Understanding the half-life of phentermine is important, as it can help explain why it is generally recommended to take the medication as early as possible in the morning.

Due to its long half-life, taking phentermine later in the day may interfere with normal sleep patterns for some individuals. The stimulant properties of phentermine can potentially cause difficulty falling asleep or staying asleep, leading to sleep disturbances. By taking phentermine earlier in the day, the medication has more time to metabolize and diminish its effects by bedtime, allowing for a better chance of a restful night’s sleep.



In conclusion, it’s important to clarify that while phentermine is chemically related to amphetamines, it is not an amphetamine itself, nor is it “speed” or an illicit substance. Phentermine is a medication used primarily as an appetite suppressant for individuals seeking to lose weight.

Phentermine works by stimulating the release of certain neurotransmitters, such as norepinephrine, in the brain. This stimulation helps to reduce appetite and promote weight loss by making individuals feel less hungry and more satisfied with smaller amounts of food.

Unlike amphetamines, phentermine has a milder stimulant effect and a lower potential for abuse and addiction. It is approved by regulatory authorities for medical use and is typically prescribed under the supervision of a healthcare professional.

Phentermine should always be used as part of a comprehensive weight loss program that includes lifestyle changes such as dietary modifications and increased physical activity. It is important to remember that phentermine is not a standalone solution for weight loss, but rather a tool to support efforts in making healthy lifestyle changes.

If you are interested in trying phentermine as a way to increase your weight loss progress, please reach out to us today. 

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