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Didrex is a prescription diet pill. Although not as popular as it's similar cousin Phentermine, Didrex has been found to be an effective treatment for obesity, when combined with a healthy diet and exercise. Didrex is the brand name of the weight loss drug Benzphetamine. Benzphetamine (Didrex®) was approved by the FDA in 1960 for the short-term treatment of obesity. Didrex, like other popular prescription diet pills such as Phentermine and Adipex, acts similarly to an amphetamine and stimulates the central nervous system, which in turn increases heart rate and blood pressure and decreases appetite.

How Does Didrex Work?

Didrex (Benzphetamine) is called a sympathomimetic amine. Although the reason sympathomimetic amines work to reduce hunger is still not understood completely, it is known that Didrex acts similarly to an amphetamine in the body. Like an amphetamine, Didrex likely increases the release of norepinephrine and/or dopamine in the hypothalamus (hunger center in the brain), thereby decreasing appetite.

Best Didrex Diet Pill Alternative

Though Didrex is an effective diet pill, you may be seeking one that has been scientifically created to be more powerful. That non-prescription option is Fenfast 375.

The best Didrex replacement on the market is considered to be Fenfast 375.  This is because the benefits of the two pills are the same, including a metabolism stimulation, an energy boost, and effective appetite suppression.

There are no ineffective herbs in Fenfast 375, nor is there any chromium or ephedra.  In fact, all that is in Fenfast 375 is a formula of clinically researched and proven ingredients that are powerful enough to outperform Didrex in both its effectiveness and its strength.  It is also available legally without a prescription and for a lower cost, while remaining safe to use whether you just want to shed a few pounds, or you’re beginning a diet that will take a longer time to complete.

The formula of Fenfast 375 is made up of DL-Phenylalanine, 1,3,7-trimethylxanthine and Hordenine HCl provides the following important benefits:

      • Up to 20 pounds of weight loss in three weeks
      • Over-the-counter diet pill with prescription strength
      • Half the calorie intake every day (about 1600 calories)
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FENFAST 375 Success Stories

Patty PAmey
April 22, 2013
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My friend had ordered Fenfast 375 and was losing weight much faster than just with dieting and exercise. I bought a bottle too and am so happy with the results. Not only have I lost weight quickly, but sticking to my diet is so much easier now that my appetite is lower. We're so thrilled with it that we're telling everyone we know about it.

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Alina R. from Dakota
April 3, 2013
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“Fenfast 375 is as strong as Didrex”
Two years ago I was prescribed Didrex to help me overcome my struggle with obesity. Didrex worked very well to suppress my appetite and I regained control over bad eating habits for the first time in my life. When I read Fenfast 375 is as strong as Didrex I had to place an order. I will be back to give a full review.

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Fenfast 375 vs. Didrex

When Fenfast 375 is compared with Didrex, Fenfast 375 comes out on top.

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The only alternative to Didrex that offers similar weight loss benefits is Fenfast 375.  This is because the main ingredients in both diet pills are clinically proven to provide a significant energy boost while speeding up the metabolism and suppressing appetite.

This, however, is the end of the chemical similarities.  Didrex is close to amphetamines, which can bring about addiction and other unpleasant side effects.

On the other hand, Fenfast 375 does not have chemical similarities to amphetamines.  This makes it much safer to use than the prescription drug.  That said, the benefits of both pills remain the same, with a fat burner through a metabolism boost, as well as a heightened energy level.

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Health Benefits of Didrex

The Information You Need to Understand Didrex

Didrex is a drug that has been designed to help you lose weight.  It is made out of the generic medicine called benzphetamine.  This type of prescription medication falls into a category that is known as sympathomimetic amines.  These are chemicals that work in a way that is comparable to amphetamines. This means that Didrex stimulates your central nerve system in a way that decreases your appetite, boosts your blood pressure, and raises your heart rate.

It is designed to help obese patients to lose weight by easing some of the more common symptoms associated with the process, such as hunger pangs and fatigue.  It is meant to be used in conjunction with a proper healthy lower calorie diet and regular exercise routine.  It should be used only over the short-term, as its efficacy fades over the long term, and dependency can result.

Though Didrex can be a highly effective weight loss solution, it is not meant for everyone. For example, individuals who are currently taking MAO inhibitors, or who have done so within the last two weeks should not take this drug, as it can lead to side effects that are highly dangerous or potentially life threatening.

In fact, it’s important to tell your doctor about any medications you may be taking, regardless of whether they’re prescription drugs, over the counter medicines, herbal remedies, or nutritional supplements.  This will help to prevent possible contradictions.

You should also tell your doctor about any medical conditions you may have, as Didrex may not be appropriate for individuals with:

  • Heart disease
  • Coronary artery disease
  • Heart rhythm disorder
  • Severe hypertension
  • Glaucoma
  • An overactive thyroid
  • Pregnancy
  • Have a history of abusing alcohol or drugs
  • If any other diet pills have been used within the last twelve months.

For people who are suitable candidates for the use of Didrex, it should be carefully taken according to the directions provided by your doctor.  They will be indicated on the label of your prescription package.  Never take more or less of this pill than the directions state, and don’t use it any more or less frequently, or for a longer or shorter time than instructed.

It is usually recommended that Didrex be taken one time every day either in the middle of the morning or the middle of the afternoon.  It should not be taken in the evening, as it can cause sleep disturbances.  To avoid problems with sleeping – such as insomnia – avoid taking this pill after 6:00 pm. 

If you feel that the drug is not working properly, or if your hunger seems to be worse than it was before taking it, be certain to report your suspicions to your doctor, as this medication may not be right for you.

This drug was designed only to be used over the short term – that is, not longer than a few weeks.  If you do not lose any weight in the first four weeks of use, make sure to tell your doctor, as it may not be working properly.  You may need to change the way your pills are being taken, alter your diet or exercise patterns, or use a different medication altogether.

Keep in mind that Didrex is not designed to be used all on its own for weight loss.  Instead, it must be accompanied by proper eating and activity levels.  Keep track of all of these aspects very closely, and keep your appointments with your doctor to monitor your progress throughout the length of the treatment.

While taking Didrex, avoid drinking any alcohol, as it may magnify any side effects, making them unpleasant or potentially dangerous.  Before you take part in any activities where you will need to think clearly or respond quickly – such as driving – make sure that you have used this pill for a few days and are well aware of your reactions to it.

As with all prescription drugs, Didrex comes with the risk of some side effects.  These include:

  • Swelling in the feet or ankles
  • Chest pains
  • Shortness of breath
  • Feeling faint
  • Confusion
  • Unusual behaviors
  • Pounding heartbeat
  • The sensation that the heart is fluttering
  • Irritability
  • Severe hypertension


Should you experience any of those side effects, stop taking Didrex immediately and contact emergency medical assistance.

Other possible side effects of this medication which are less serious include:

  • Headache
  • Restlessness
  • Dizziness
  • Hyperactivity
  • Tremors
  • Sweating
  • An unpleasant taste in the mouth
  • Dry mouth
  • Diarrhea
  • Nausea
  • Upset stomach
  • Skin rash

Other side effects are also possible.  It’s important to pay attention to all of your reactions so that they can all be discussed with your doctor as you decide how you should proceed with your diet.


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