Phentermine How Much Weight Will I lose

Phentermine: How Much Weight Will I Lose in a Week. 48 Pounds for Six Months

, reviewed by
 – Updated May 29, 2023
, reviewed by
 – Updated May 29, 2023
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Table of Contents

Phentermine is a very effective weight loss remedy. However, before you ask the doctor to write a prescription for Phentermine and how much weight will I lose in a week, you should learn about the drug’s characteristics.

They use Phentermine with diet and exercise to treat obesity, especially in people with risk factors such as high cholesterol, hypertension, and diabetes.

You should understand that weight loss begins on the first day. But you may not see the changes at once. The reason is that accumulating the drug in the body takes three to five days. And often, people say they feel no effects until a few days after they start using the drug.

Later, the action of Phentermine is often similar to that of amphetamine. Like amphetamine, it has a stimulating effect on the central nervous system. But Phentermine is not a narcotic. It doesn’t cause rapid addiction and doesn’t have a destructive impact on the body.

How much weight can you lose on Phentermine

Depending on the body’s ability to engage in the process of losing weight and changing lifestyle, you can lose a few pounds in the first week of the treatment, as the body begins to get rid of the excess water first. However, the recommended weekly weight loss rate is one to two pounds. This rate, if maintained, leads to slow but steady weight loss. At the same time, which is very important, your body loses fat, not muscles.

For the body to get used to reduced weight, doctors may advise taking Phentermine intermittently for some time. After that, you should restart taking the drug. With this schedule, the average weight loss is usually 3% and 5-7% of initial body weight after 3 and 6 months of the treatment, accordingly.

If to use accurate figures, according to the United States federal agency, under the Department of Health and Human Services, “Centers for Disease Control and Prevention (CDC),” the average weight loss is from one to two pounds in a week. It means you can lose 4 to 8 pounds in a month, or up to 48 pounds in six months.

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You can improve the drug’s effectiveness with four simple actions:

  • Drink more liquid;
  • Eat properly;
  • Do sports or fitness;
  • Maintain a healthy lifestyle by giving up smoking and alcohol.

Doctors don’t recommend taking Phentermine for more than three months because, in this case, there is a risk of addiction to this drug and the appearance of drug dependence.


Phentermine is an effective drug that can help you lose weight.

But due to its effect on the central nervous system and the cardiovascular system, there are risks of addiction.

You should consider it when starting the treatment with Phentermine and strictly follow all the doctor’s prescriptions.

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