• Phen RX

    Phen RX is a fat burner that is supposed to increase your energy levels as well as help you burn off fat fast. It comes from Nexgen Biolabs a USA based company that specialises in OTC copies of prescription meds and the supplement is available as a diet pill or as a weight loss patch.

    Phen RX is advertised as an OTC alternative to prescription diet pill Phentermine so if you are looking for a powerful US made fat burner you may be tempted by this supplement.

    Phen RX Pros

    • Some positive customer feedback

    Phen RX Cons

    • No ingredients list provided
    • Contains potentially dangerous ingredients
    • Deliberately confusing explanation about how it works
    • Dubious money-back guarantee
    Watchdog Rejected Diet Pills
    Phen RX
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    What You Need To Know About Phen RX

    We are not very impressed with Phen RX.

    It contains some dodgy ingredients in unknown quantities and you may find that side effects are an issue. You should certainly avoid it if you have any health issues, especially those relating to heart and blood pressure.

    We are not very impressed with the so called guarantee either. This is advertised but without any details about how to claim it, we feel it is unlikely that you will obtain a refund if you are not satisfied.

    What Are The Side Effects Of Phen RX?

    Phen RX will certainly not be safe for everyone and if you have a medical condition relating to heart or blood pressure or you are taking prescription medication you should definitely avoid.

    Many Watchdog readers have mentioned side effects including; headaches, vomiting, nausea, heart palpitations, jitteriness, anxiety, increased heart rate, elevated blood pressure, increased risk of stroke or heart attack., insomnia, and upset stomach.

    According to Nexgen side effects are rare and may include dry mouth and sleeplessness.

    How Much Does Phen RX Cost?

    If you buy Phen RX direct from the Nexgen Biolabs site it is expensive:

    • 1 x bottle of 30 capsules costs $39.99. Shipping is calculated at the point of sale.
    • 1 x packet of 30 weight loss patches costs $29.99.

    Our Verdict On Phen RX

    All that said, there is some genuine positive customer feedback for Phen RX. Some customers have found that the capsules and the patches have helped support weight loss so this supplement is obviously doing something for some people.

    If you can find some cheap deals on the Groupon discount site it won’t actually cost you much to give this supplement a try. Then again when there are much better alternatives on the market we would question why waste your time.

    Despite this, we cannot recommend this supplement. In our opinion it is dangerous and if you are one of the many people who suffer from side effects, even a discount price will turn out to be a waste of money.

    phentaslim bottle
    The most popular consumer choice in 2018 is Phentaslim.

    With a combination of proven ingredients, superb customer service and a 60-day money-back guarantee, Phentaslim is making big waves in the diet world.

    Find out why thousands of people are choosing Phentaslim to achieve their weight loss goals, and why it's also the editor's top selection.

    Read the Watchdog Phentaslim review here.

    Phen RX Review

    Phen RX is a supplement that has copied the name of notorious diet pill Phentermine so just from this alone we can assume that it is going to be strong!

    This supplement is most commonly taken as a diet pill but is also available as patch that you stick to your skin and wear in the same way as a nicotine patch.

    Phen RX Facts

    • Made by Nexgen Biolabs
    • Comes in 60 capsule container – one month’s supply
    • No money-back guarantee offered

    Phen RX contains a lot of stimulants. These include Trimethylxanthine – which is actually just a fancy name for caffeine, a mood stimulant called Beta Phenylethlamine, also known as PEA, which is believed to stimulate the brain’s feel good chemical dopamine.

    It contains Synephrine a chemical that increases the metabolism in a similar way to banned substance Ephedrine and increases heart rate and blood pressure. It contains Yohimbe – a chemical that is believed to stimulate sexual and athletic performance.

    Other ingredients include Chinese plant extract Schizandrol – a stimulant that kicks in a few minutes after taking and can last for up to an hour, Dimethyl 4 another stimulant with a similar way of working as ephedrine and trace amino acid Tyramine.

    How to Take Phen RX

    Take two capsules a day with water

    It is not advisable that anyone takes this supplement for too long or if there are any medical issues. Phen RX could be dangerous for some people as it will increase the heart rate and blood pressure and it may cause a range of mainly heart related side effects.

    Nexgen Biolabs have past form in marketing supplements that copy prescription drugs and are high in stimulants. Phen RX is supposed to be similar to Phentermine – a weight loss supplement with numerous side effects and only available under prescription. In addition, one of their most popular supplements is AdderRX a copy of Adderall – an addictive prescription drug that contains amphetamines and is used to treat ADHD (attention deficit hyperactivity disorder).

    Phen RX Concerns:

    • Incomplete ingredients profile – you do not know how much of any ingredient you are taking
    • Contains ingredients that increase heart rate and blood pressure
    • Probably will not help weight loss once you get used to the effects

    Adderall misuse is rife in US colleges where students use it to boost mental performance and study grades. Nexgen Biolabs have been criticised for handing out free samples of Adder RX on US college campuses.

    Other Nexgen Biolabs supplements include Jet Rush aimed at party animals and speed freaks and SlenderFruit-7.

    As with all weight loss supplements, just because Phen RX is legal, does not mean that it is safe.

    What Does Phen RX Claim To Do?

    There is nothing subtle about Phen RX. You will notice this supplement and if you are looking for a stimulant buzz, you have probably found what you are looking for here. According to Nexgen Biolabs Phen RX it is their best selling strongest weight loss formulation.

    Stimulants are popular for weight loss and there is evidence that they work. Stimulants increase the speed of the metabolism and as a result increase calorie burn; they can give you added energy and motivation to exercise.

    According to the advertising, this comes down to six key benefits:

    • Extreme weight loss
    • Maximum strength appetite suppression
    • Energy enhancement & mental focus
    • Significantly reduce BMI (body mass index)
    • Targets fat and lipid metabolism on stubborn problem areas
    • Enhance metabolic function and fat burning

    So Does Phen RX Work?

    PhenRx contains stimulants and ingredients that will increase your heart rate and blood pressure. You will probably notice an energy buzz after taking but there is nothing here that specifically targets weight loss beyond the stimulant effect.

    The capsule contains just 377 mg but we do not know the ingredients breakdown. It may be mainly caffeine (an average coffee contains 100mg per cup) but whatever it is you will probably notice it.

    Phen RX is a very basic looking supplement. It contains only stimulants and there is evidence that that taking stimulants can help increase weight loss. The downside is that this method of weight loss will cause side effects so will not suit everyone.

    Many Watchdog readers have contacted us complaining about side effects following taking the capsules or the patches.

    What Are The Ingredients For Phen RX?

    PhenRx is a diet pill that contains stimulants and not much else. The company are cagey about their ingredients and do not provide a full ingredients list, beyond a fuzzy picture of a label that is impossible to read.

    When we did find one we saw that this is a propriety blend so lacks an ingredients breakdown. This means we can’t give you ingredient quantities.

    However each capsule is equal to one serving and contains 377mg:

    • 137 Trimethylxanthine: This is another name for caffeine, the world’s favourite stimulant. It can be effective as part of a weight loss diet because it raises the speed of the metabolism.
    • Synephrine HCL: This stimulant raises the heart rate and increases blood pressure and is billed as a way to increase the metabolism in place of banned substance ephedrine.
      Synephrine sometimes called Bitter Orange or Citrus Aurantium features on WebMD’s danger list. It is not safe and can cause heart palpitations and a whole range of side effects. It has been linked to causing heart attacks and strokes. See our previous investigation on Synephrine HCL for more information.
    • Schizandrol: Sometimes used in body building products and is also an ingredient in other NexGen product JetRush. This Chinese plant extract has a stimulant effect within a few minutes of taking. The short term high will last around an hour and the side effects have not been fully investigated. It may be unsafe. Does not appear to have an application for weight loss
    • Beta Phenylethylamine (also known as PEA): is believed to stimulate brain chemicals serotonin and dopamine. It causes a short-lived high effect but is quickly metabolized. It is this high that makes it attractive as a supplement but the effect often lasts only a few minutes.
    • Yohimbine: Another one on the danger list, Yohimbe is believed to improve sexual and athletic performance but lacks evidence to prove this. Reported side effects include blood pressure changes, heart beat irregularities and heart attacks.
    • Dimethyl 4: Stimulant believed to be a safe alternative to ephedrine but no evidence that it is actually any safer. Sometimes used in medication for attention deficit disorder and weight loss but there is no evidence that it works. Can raise the heart rate and blood pressure.
    • Hydroxy Phenylethylamine: Also known as Tyramine a naturally occurring trace element from amino acid tyrosine. Can cause side effects in some people and is known for creating the “cheese effect” – the migraine that some people experience after eating cheese. May increase blood pressure. Source: http://www.ncbi.nlm.nih.gov/pubmed/16856145

    Does Phen RX Have Any Side Effects?

    Phen RX will certainly not be safe for everyone and if you have a medical condition relating to heart or blood pressure or you are taking prescription medication you should definitely avoid.

    Many Watchdog readers have mentioned side effects including:

    • Headaches
    • Vomiting
    • Nausea
    • Heart palpitations
    • Jitteriness
    • Anxiety
    • Increased heart rate
    • Elevated blood pressure
    • Increased risk of stroke or heart attack.
    • Insomnia. You may not be able to sleep at night
    • Upset stomach

    According to Nexgen side effects are rare and may include;

    • Dry mouth
    • Sleeplessness

    Caution: Avoid if pregnant or breast feeding. Do not take PhenRX if you suffer from a heart condition or have high blood pressure. Do not take if you are sensitive to stimulants or suffer from mental problems. Avoid if you have any type of medical condition related to the thyroid.
    See your doctor before taking if you are on medication, because of the risk of drug interactions.

    Are There Any Customer Reviews For Phen RX?

    Yes and it is a mixed bag. Many people are very pleased with this supplement and feel very positive about it.

    A big thumbs up from me, I dived in to try something new and I’m very happy
    with the overall outcome, I highly recommend these to lose weight

    said one customer.

    Despite some customers reporting an increase in appetite, this is not the same for everyone;

    This is the first weight loss product we’ve tried that actually seemed to work… This is a pretty strong stimulant, so if you are not used to them, be careful

    Not everyone is as pleased.

    I took these for about 4 days and had to stop. It felt as though my heart was affected badly… racing at times and a feeling of pressure. In any case, it may be good for some, but obviously not for me….

    A typical negative review came from this customer;

    I felt no different taking this product. It has not given any energy nor weight loss. I would not recommend it, save your money.

    Does Phen RX Offer a Money-Back Guarantee?

    According to the Nexgen Biolabs advertising, all purchases from the website are covered by a 30 day guarantee.

    This sounds good but in our opinion, Nexgen Biolabs are unlikely to honour this claim. There are no details about how to claim the guarantee such as the return address, whether you need to obtain a RAM (return number) or any other criteria.

    This lack of information in the terms and conditions makes us believe that the guarantee is there for decoration only and may not be honoured should you wish to claim a refund.

    Our advice about the guarantee? Don’t hold your breath. You are very unlikely to get your money back.

    Where Can I Buy Phen RX?

    Phen RX used to be on sale via Amazon and similar websites but these days it seems to be mainly on sale via the discount site Groupon where prices will vary.

    One deal we have seen is a two pack package (2 x 30 capsules) of Phen RX for $17.99 plus shipping costs.
    We have also seen 1 x packet of Phen RX patches (30 days supply) for $19.99 plus shipping.

    If you buy Phen RX direct from the Nexgen Biolabs site it is more expensive:

    • 1 x bottle of 30 capsules costs $39.99. Shipping is calculated at the point of sale.
    • 1 x packet of 30 weight loss patches costs $29.99.

    How does Phen RX compare to Phentaslim?

    CriteriaPhen RX ComparisonPhentaslim comparison
    Clinically Proven Ingredients
    Side Effect Free
    Positive Customer Reviews
    24/7 Support
    Money-back Guarantee

    Disclaimer: Our reviews and investigations are based on extensive research from the information publicly available to us and consumers at the time of first publishing the post. Information is based on our personal opinion and whilst we endeavour to ensure information is up-to-date, manufacturers do from time to time change their products and future research may disagree with our findings. If you feel any of the information is inaccurate, please contact us and we will review the information provided.

    47 comments on “Phen RX”

    1. Patricia Roseman says:

      Did some of a bottle. Did very little except make me temporarily energetic, then crash. It can make me anxious and irritable. I’m a “talker” so this increased my chatty Cathy tendencies with the nervousness. Would not recommend to a friend or anyone with any health issues. I have DII and feel this product may be dangerous for me. Have had heart issues until I had by pass and CABG, so I’m not a good candidate for products like this anyway. Too hard on the nervous system. Great for cleaning the house!

    2. Fancy says:

      Phen Rx patches seem to help but when I take the pill i seem hungry all the time and get nauseated very badly.

    3. Amberly Breamer says:

      I just started phenrx 3 days ago. Since then I have felt more fatigue than usual and I actually think it increases my appetite. Maybe I need to try it longer….

      1. Fancy says:

        I feel like my appetite has increased from taking the pill but patches seem to work better for me.

    4. NIKI TAYLOR says:


    5. Ana Roberts says:

      Im losing weight. 2lbs a day wjth the PM version. I cant wait for the patches.

    6. Violette Asley says:

      I like this article

    7. Ashley says:

      Did anyone have a metal taste in their mouth? I have all day and it’s my first day.

    8. Jessica says:

      Which is better PhenRx or PhenRx PM

    9. Carmen Houston says:

      Started today, a little jittery/anxious but not really hungry at all. I put the patch over my navel but it didn’t stay very well. I am going to put it below or above my navel; I think it’ll adhere much better as your belly button does produce moisture throughout the day and would obviously interfere with its ability to stick for 24 hours. I AM going to sleep (right now) with the patch on. I think (maybe hope) I’ll be able to sleep. If not, I’ll be using it for the 18 hours I’m awake and go from there. I’m optimistic at this point and look forward to positive (I hope) results.





    11. Renee says:

      I am trying my patch today for the first time. I didn’t want it on my abdomen, so I put in on my buttocks area. I hope it works….I am worried about getting jittery.

      1. Stephanie Acosta says:

        Left or right of navel
        Upper arm
        And thigh area

    12. Linda says:

      I got the patches. Placing it around my Navel doesn’t work for me adding. Bondage arou the corners didn’t help either. any other suggestions. Thanks

      1. Stephanie Acosta says:

        To the left or right of the navel, not directly on the navel

    13. Doctor says:

      Yes it does have a smell. Mine also came in the same packaging. I started yesterday. My stomach feels like its tingling but no issue.

      1. TAMMY YOUNG says:

        Are you still doing the patches? What side effects did you have? How much weight did you lose?

    14. Tasha says:

      I ordered the Patches and they smelled more like Ice Hot

    15. Tasha says:

      Hi Judy – I ordered them also (they arrived yesterday)and was VERY surprised they were Outside the box…not to mention the “free” re-order they offered me. After reading the reviews I am NOW skeptical about using them, because I am not sure if they are Authentic and if they are I am worried about the “bad” ingredients……..

      1. Stephanie Acosta says:

        Mine came out the box too, but I’m sure it was to save on shipping.
        The smell is because the herbs used.
        I’ve got mine and it’s 9pm… I haven’t eaten since 12 and no urge to eat.

    16. Whitney says:

      I have been looking for a supplement for quite a while. However, this does increase my anxiety.

      I did notice when quitting, that a cup of coffee before the gym helps WAY more.

    17. C.E says:

      I received my bottle in the mail today. I have not tried the supplement yet, but I have a major concern. My capsules look nothing like the PhenRx capsule on the bottle or the website. My bottle shows a white/blue capsule; however, when I opened the bottle, the capsules are completely clear with revealing the tanish color supplements within it. This is very concerning to me that I possible don’t even have the correct supplement. I googled the PhenRx capsule image to see if any pictures showed the type of capsules that are in my bottle. Online they are all white/blue capsules. I will be emailing the company about this.

      1. A.T says:

        I also opened by bottle and got clear capsules. I was very concerned as well because my coworkers also ordered the same product and the capsules were white and blue. I need to email the company also

        1. Lilly says:

          Will you please let us know if they respond to you, I have yet to start taking mine, but I’m interested in their response.

        2. R.E. says:

          The clear ones are fake, DO NOT TAKE, you don’t know what you are consuming, very dangerous.

    18. Roxanne Justiz says:

      I bought the Phenrx patches on groupon for $20. Its for an entire month, I can honestly say i am extremely happy with the results, I have been taking it for about a month and have lost a pound a day! It has completely changed my body, I dont have side effects, I finally have enough energy to exercise, But i had lost 20 pounds without doing anything, I have no appetite at all, I forget to eat, So i set up alarms throughout the day to at least eat veggies and food throughout, I may have risen my blood pressure but i take meds for that so its not an issue for me, If you are desperatwly trying to lose weight fast this is perfect, I was too overweight before to be able to exercise and had no energy, So now i amslowly trying to do so, I just walk about 15 minutes a day for now, I also learned that doing weights is supposed to be more effective than cardio. People that saw me a month ago are amazed at how i look. The first thing they always ask is how? Well know you know too. Best of luck on your journey.

      1. JudyC says:

        Hey Roxanne , I have a question hope u can clarify for me. I also order Phen rx patch. I have tried google but nothing on image of patch due to the fact when I recieved it. Inside bag was unfolded phen rx box and packing of patches outside box. so not sure if they are the real thing. Thanks

        1. k.g. says:

          Mine came in the same way April. I started today — and we will see.

          1. JenS says:

            I ordered mine from groupon as well, and they came this way also. I started yesterday and already notice the energy boost!

        2. Tasha says:

          …did you patches have a unique “smell” ??

          1. Sue says:

            Mine had an “earthy” smell. Kind of like patchouli

      2. Blaire says:

        I got mine yesterday…where do you put your patch at. It says “naval” area but nothing else.

        1. Jamie says:

          I received mine monday and started yesterday. Yesterday, I was a little jittery but today I am noticing I have energy and I am not hungry. One question for everyone though, do you keep your patch on while you sleep? I wore mine for 16 hours yesterday. Took it off when I got home and replaced it with new one this morning.

          1. Sue says:

            I dont notice a change in energy at all. Its been a week and im 5lbs down.

          2. Stephanie Acosta says:

            It says to wear for 24 hours, so yes I slept with mine.

        2. Tasha says:

          did your patches smell like “icy hot” ?

          1. Carmen Houston says:

            Yes, it smells a bit like Icy Hot but it’s not strong or noticeable once you apply the patch.

          2. Stephanie Acosta says:

            Mine did, but it’s all natural herbs that’s why

        3. Stephanie Acosta says:

          Place left or right of navel
          Thigh or upper arm

          1. dawne says:

            Can you wear them underneath the navel area,

        4. Stephanie Acosta says:

          Left or right of navel
          Upper arm
          Or thigh area

    19. Nichole says:

      I’ve taken many diet pills and this one made me absolutely sick. I could barely function. Bad stomach pains, sick feeling, I can rarley think of a time I was that sick. Unbelievable. Only took 2 pills. This was not for me. I’ve even had the RX prescribe to me and felt nothing like this.

    20. Heather says:

      I was surprised to see bad reviews as I’ve had very good results from Phen rx. It gives me that extra push to be able to hit the gym after a 10 shift. I am concerned by the dangerous ingredients list and would like to add that this drug and also the ones you listed are no longer offered on Amazon.com

    21. L.R. says:

      Ugh, I bought these and felt like an idiot. I felt so jittery and anxious, and when mixed with clinical depression , caused me to be even worse. Nausea alllllll day, and when I was off, appetite came back full force. There were times when I was sure my heart would beat out of my chest. Wouldn’t recommend.

    22. anja dreiocker says:

      can I break down the capsule because I feel dizzy ! should I take it with food???

    23. kathrin keasler says:

      I got my bottle with a piece of paper what offered me a free bottle. I followed the link and apparently when I leave a ( true)review about phen rx and I send them the link of my review, I get a free bottle. Not sure yet if this stuff works, but nowadays everyone wants something for free. So I would like to see real reviews! Since I get hungry from it. But I had to try something since Saba changed their formula.

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