Phentabz is a weight-loss supplement by Gentech Pharmaceuticals (bought out by or now-renamed Lexium International). It was created as a replacement for the diet pill phentermine (Apidex).
There are three different types of Phentabz products available for sale: prescription Phentabz Plus, Phentabz, and Phentabz Teen (specifically for 16-to-19-year-olds). The latter two are available without a prescription.
Under the name “Phentabz” on the bottle you will see a name in parenthesis called Ampheta HCl. I was curious to know what this was, so I looked into it to discover that it is their proprietary diet blend that contains a synthetic amphetamine (stimulant). The company apparently developed the substance in their own labs and made up the name, as there are no other definitions of any sort about what exactly Ampheta HCL is. It’s found in both the Phentabz weight-loss pills and Gentech’s Addtabz, a non-prescription Adderall substitute. 
There is no return policy listed anywhere on the main company website.
When looking into Gentech Pharmaceuticals, they did have a Better Business Bureau (BBB) file that was opened in 2013, but they have an F rating due to “Advertising issue(s) found by BBB.” 
Lexium International has no listing on the BBB.
Company Contact Information:
- Gentech Pharmaceuticals, 43 Barkley Circle #203, Fort Myers, FL 33907
- Lexium International, 1591 Hayley Lane #203, Fort Myers, FL 33907
Each 60-tablet bottle—a one-month’s supply, following the recommended dosage of one pill 30 minutes before breakfast, and 30 minutes before lunch, not to exceed 2 pills per day—costs $69.00 plus shipping and handling.
On Gentech Pharmaceuticals’ website they claim that Phentabz was created as the non-prescription replacement for phentermine, without all of the side effects that phentermine poses.
They say that the formula is meant to help increase mood, increase energy levels, the ability to breathe easier, increase weight loss, increase body fat release, and decrease your appetite altogether. 
They also claim that Phentabz is approved by the FDA and follows all of the rules and regulations. This one isn’t true. For one thing, the main ingredient was banned by the FDA in 2013 and they’re trying to get it off the shelves (more about this in a moment). And for another, not only is Phentabz not in the database of FDA-approved drugs, it’s not found in a search of the entire FDA website.   
On Lexium International’s site they claim,
The ingredients in Phentabz ™ work to perform two essential functions. To help increases the body’s mobility of fat while promoting an increased metabolic rate. Phentabz™ then aids in reducing appetite to ensure patients have control and motivation.
KEEP OUT OF REACH OF CHILDREN. Not intended for people under 18 years of age. Do not use if pregnant, nursing, or have a known medical condition such as high blood pressure, heart disease, diabetes, or cardiovascular disorder. Do not combine with alcohol. This product should not be used by individuals taking antidepressants, amphetamines, other weight loss products, any stimulants or medications. 
Phentabz Ingredients 
Gentech/Lexium mentions the active ingredients present in the diet pill, but it’s not listed anywhere how much of each ingredient is in these pills.
- Methylhexaneamine – Also known as 1,3-dimethylamylamine (DMAA)
- 1, 3, 7 Trimethylxanthine T6 – the chemical name for caffeine
- Octopamine – Also known as Beta 4-dihydroxyphenethylamine
The Science Behind Phentabz
There is a reason why the word “Phen” is the in the product, as it is similar to Phentermine. The company wanted to create an FDA-approved supplement that could be just as profitable as phentermine—they didn’t get it. Phentabz isn’t on the Approved list, and neither are any of the individual ingredients. In fact…
Methylhexaneamine (DMAA) is a banned substance among many different organizations, so be mindful if you are a college athlete or are associated with an organization that has a ban list. According to the World Anti-Doping Agency (WADA),
Methylhexaneamine (MHA), which sometimes is presented as dimethylamylamine [DMAA], remains prohibited in competition as a specified stimulant under Section 6.b. It has been considered a stimulant at least since WADA took over responsibility for the List in 2004. It was reclassified on the 2011 List to become a “specified substance”. Methylhexaneamine was sold as a medicine up to the early 1970s and has medicinal properties, but to WADA’s knowledge it has not been sold as a medicine since then. 
It’s also been banned by the FDA, regardless of how many times HiTech Pharmaceuticals takes them to court over it—and hasn’t won yet. As of this writing, DMAA diet pills and supplements are illegal in the United States.  
Dimethylamylamine is LIKELY UNSAFE when taken by mouth. Since it is thought to work like a stimulant, there is concern that it might increase the chance of serious side effects such as rapid heartbeat, increase in blood pressure, and increase the chance of having a heart attack or stroke.
In clinical research, taking a product containing dimethylamylamine plus other ingredients seems to increase heart rate and blood pressure.
There have been several reports of dangerous side effects including stroke, a condition called lactic acidosis, heart attack, and death in people who have taken dimethylamylamine.   (emphasis added)
Trimethylxanthine—caffeine—present in Phentabz supplements, is known to increase energy and awareness, which has been proven many times over. However, this will come with a crash if you are over-stimulated, so be aware of this if you are sensitive to caffeine.
Octopamine works to stimulate your dopamine and norepinephrine receptors in the brain, which will steady your focus and help in promoting fat loss. 
Word On The Street About Phentabz
Because this diet pill is not sold outside of the main website, there were no outside objective reviews to look at. The authenticity of any product is masked when you cannot find real people with results or lack thereof from the product.
Every supplement affects every individual differently. Gender, age, sometimes race, pre-existing medical conditions, and individual body chemistry—as unique as a fingerprint—can affect how a supplement works on you. That’s why supplements always add that “individual results may vary” disclaimer, and it’s why reviews for a drug or supplement can be all over the spectrum. Only you and your doctor can figure out how it works for you, so always be forthcoming and transparent with your doctor about side effects you experience, as well as if the substance doesn’t seem to be doing anything for you.
The Bottom Line: Is Phentabz Worth a Try?
Definitely not. This diet pill has been touted as a strong weight-loss drug, effective if you follow its directions. The manufacturer does not market the ingredients in the supplement, probably because of the DMAA, which has caused quite the controversy over the years with other diet supplements. This is a sly tactic form the company, to try and cover their tracks to keep the product on the market as long as they can.
But regardless of the marketing, I will say again that as of this writing DMAA is illegal in the United States. And the FDA doesn’t ban substances without very good reasons. That a supplement distributor—HiTech—is appealing the judgment, over and over and over, is irrelevant. At the moment it is illegal and consumers have been warned to avoid it because of the potential for serious, possibly dangerous, side effects as mentioned above.
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*Individual results will vary.