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Phentermine is a prescription drug that is commonly used for weight loss. It falls into the substituted amphetamine chemical class and is normally prescribed by a doctor to people who have a valid medical reason to lose weight, although I have heard that some weight loss clinics can be flexible when issuing the prescription. The drug was first introduced in 1959.

The guidelines state that Phentermine can be prescribed for short term use for patients who are classed as obese or overweight and have at least one weight-related condition such as controlled high blood pressure, diabetes, or high cholesterol. Phentermine should be incorporated into lifestyle changes  that include regular exercise and a reduced-calorie diet.

The drug is effective for short term use but some people have reported that once discontinued, the lost weight is regained easily, but that is the common experience of people who follow a weight loss program of any type and then abandon it completely.

Phentermine is known to work well, but it is not known how and why it works. Some people can experience side effects from Phentermine. Some possible side effects are:

  • Dizziness
  • Dry Mouth
  • Sleep Difficulty
  • Irritability
  • Vomiting
  • Nausea
  • Constipation or Diarrhea

The drug may also raise your blood pressure and could be addictive to some people.

I Know someone who has tried Phentermine. A few years ago she was taking what she believed was a 30 mg pill once per day. She stated that she did lose weight, but the pills caused her to be jittery, have high blood pressure, she found it difficult to sleep, she was very thirsty all of the time and she stopped taking the pills because of this. She recently began taking Phentermine again but this time the dose is 15mg, once per day in the morning and she has had no ill effects so far. My friend says that the pill works very well for weight loss at this dose.


If you and your doctor do decide to use Phentermine, be aware of the side effects and use it responsibly. There is no point in losing weight with this product if it causes other health issues. Phentermine cannot be taken permanently and you need to take a break from it on a regular basis. When you take the required breaks, you will need to be more disciplined in your diet and exercise programs in order to preserve the weight that you lost while taking the pills.


I have heard that you could also hit a limit to your weight loss while taking the pills and I can only suggest that you pay more attention to diet and exercise when this happens.

The best way to lose weight is always the natural way.

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