energy phentermine

Are You Getting Enough Energy From Phentermine?

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Phentermine is known to be an excellent weight loss medication for its appetite-suppressing effects, while also working to increase your energy levels, helping to keep you focused and alert, giving you the boost you need to start living a more active lifestyle. However, due to individual differences between patients, sometimes those taking phentermine may not always get the same energy boost as others. Here, we explain just how phentermine works to give you more energy, how the expectations don’t always live up to the reality, and how you can get more energy from phentermine if you’re not experiencing the increase in your energy levels that you had hoped for.

How Phentermine Gives You Energy

Phentermine causes the brain to stimulate the adrenal glands to release neurotransmitters which signal a fight-or-flight response, similar to the reaction of our bodies when we are faced with dangerous or exhilarating situations. By releasing the neurotransmitters norepinephrine, serotonin and dopamine, phentermine produces a satiating effect, increasing feelings of fullness and minimizing hunger, and by releasing adrenaline, the body becomes more adept to deal with these physically demanding situations.

Through the release of adrenaline, phentermine stimulates various bodily functions that increase glucose levels and fatty acids in the body, breaking down stored fat to increase energy production within the body’s cells. These changes allow more blood to get to the muscles and more oxygen to fill the lungs, so that you’re ready to use this energy to either flee from danger or defend yourself. Or, in the case of phentermine, your body is stimulated to want to expel this rush of energy by increasing activity levels and participating in physical exercise.

Expectation vs Reality

As phentermine is structurally similar to amphetamine, in addition to the boost of energy it provides, it allows you to remain focused on your weight loss goals and avoid snacking by amplifying feelings of concentration and alertness. Accordingly, it is advised that phentermine is taken early in the day so as to avoid insomnia at night because of the increased energy and feelings of alertness it provides. When first taking phentermine, many patients report feeling ‘wired’ or describe a ‘buzz’ feeling that gives them the boost they need to focus on their weight loss goals and incorporate more activity into their day, but these feelings often lessen after the first few days once the body becomes more accustomed to the effects.

However, for the many people that feel a huge energy boost with phentermine, there are others who simply do not get this reaction, and it’s a common problem as shown by the amount of conversations in our Facebook support group relating to energy levels, with many people commenting how they are not feeling as energized while taking phentermine as they had hoped. There was also a poll in which users have voted to indicate the energy boost they get from phentermine; nearly a third of people have said that they ‘sometimes but not always’ get an energy boost from phentermine, while 26% have said that they never get any energy from phentermine – the same amount as those who have said they do get an energy boost.  Clearly the expectation of an energy boost with phentermine does not always live up to the reality, which highlights the issue that everyone is different and therefore, reactions to phentermine can also be very different.

phentermine energy

How to Boost Energy Levels on Phentermine

If you aren’t feeling the extra energy you expected with phentermine, one option is to speak to your doctor to see if your dosage might need to be adjusted. If an increased dosage is not an option, there are several ways in which you can enhance the effects of your prescription to get more energy from phentermine:

Fuel Your Body

Dehydration can leave us feeling lethargic, so make sure to get your eight glasses a day and always have a bottle of water on you to drink while you’re out and about. Also try to increase your intake of energy-boosting foods, such as fresh fruit and vegetables, nuts, dark chocolate, whole grain, quinoa, salmon, legumes, eggs, and Greek yogurt. These foods help boost energy by providing much needed fiber, protein and other important minerals and vitamins which help your body process energy better and give it the fuel it needs to function well.

Exercise to Energize

Although it may seem that exercising would deplete energy supplies, regular exercise actually boosts energy levels. This is because exercise builds muscles that enable the body to process energy from food better, and by working the heart and lungs, blood flow is increased to organs and so energy is produced at a faster rate. Experiments have also shown that participants who went for a walk during the afternoon, when energy levels are often at their lowest, reported feeling a greater energy boost than participants who ate a candy bar. So, when you’re feeling lethargic, stepping outside for a quick walk can really help boost energy levels, plus you’ll save the calories from not eating the candy.

Avoid Acidify Foods

Experiments carried out on phentermine showed that an acidic urinary pH causes 84% of the dose to be excreted unchanged by the kidney within 24 hours, compared to just 48% of unchanged dose when urinary pH is alkaline. This means that when your urinary pH is alkaline, your body has a greater chance to process the phentermine and therefore its effects, such as increased energy levels, should last longer. There are many healthy foods which can boost your alkaline levels, although testing is advised, as the effects of some foods may differ for some people. Some of the many alkalizing foods include broccoli, carrots, cucumber, mushrooms, onions, spinach, tomatoes, apples, bananas, berries, grapes, lemons, pears, pineapple, watermelon, almonds, and cinnamon. Unhealthy acidifying foods and drinks, which should be avoided, include alcohol, coffee, soda, butter, and ice cream.

Add a Supplement

Another great way to boost energy levels, is to add a supplement such as Phen Caps. Like phentermine, Phen Caps help you to lose weight by boosting energy levels and suppressing appetite; the energy boost is provided by the stimulants caffeine and Theobromine, which speed up the body’s responses and create a thermogenic heating response, boosting metabolism and increasing focus and alertness. Phen Caps can be taken alone as an alternative to phentermine, or alongside your phentermine prescription to enhance the effects, and as they contain different ingredients, Phen Caps have been shown to give people the boost they need, which they have found to be lacking when taking phentermine alone. We would recommend that you take your phentermine in the morning as usual and then one Phen Cap before lunch, as this will give you a much-needed energy boost for the afternoon, which is often when we feel more lethargic and tend to reach for sugary snacks as a quick-fix to boost dropping energy levels.

If you’re taking phentermine and don’t feel that you’re getting the energy boost you expected, it can be very frustrating although it’s clear that there are many people who experience the same thing, which is, in part, due to the individual differences in our bodies and the way we process and react to medications. But, by following our suggestions, you can help boost the effects of phentermine and increase your energy levels so that you’ll be raring to go as you progress along your weight loss journey towards your goal weight.

Does phentermine give you the energy boost you expected or are you still wondering when the effects will kick-in? Let us know by commenting below!


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25 Responses

  1. I have started taking Phentermine 15.6 mg this past Thursday morning with my breakfast. Before my doctor prescribed this, I had no energy level whatsoever. I feel that I have a burst of energy and I am more focused at work. Yesterday, I had vacuumed my bedroom for the first time in months because I didn’t have the energy to do this. In addition, I didn’t feel tired when I have done two loads of laundry. My doctor had weighed me at 230 lbs at 5 ft 3 inches. I weighed myself yesterday at 226 lbs. I had not given up my foods that I normally eat I just cut portions. I haven’t had the urge to snack except for some fruit and almonds. Before taking this pill, I had exercised and cut my portions and it didn’t work because my doctor says sleep apnea plays role of not allowing me to lose the weight.

  2. I find that it suppress my appetite most of the day, but it actually makes me more tired then I was before taking it. I take it at 430 am a half hour before breakfast and i see my trainer at 6 am. I get really tired around 11 and for most of the day. If I take a little nap it helps. I also can’t stay up late anymore because i am so tired when night comes I have to go to sleep with that being said I was working out everyday and eating a strict diet for 2 weeks before phentermine and didn’t lose a pound. It’s been 2 weeks on phentermine, same diet and working out every day and I’m down 8 pounds.

  3. This is incredible. I take 15 mg and not only does this suppress my appetite, when I do eat, I feel full half way through. I am also amazed with my energy levels. My mental sharpness. I work nights in the ER and I have been able to keep up with the pace, without error. My co-workers have noticed that I am alert, sharp. I dread the day when I have to stop taking this. This pill seems to make me feel great all the way around.

  4. I started taking Phentermine on the 19th of this month. The first 2 or 3 days I felt a boost in energy and my appetite decreased exponentially. But 2 weeks into taking it, I get little to no effect from the pill. I even tried taking 1 1/2 or 2. Still nothing. So looks like I will be moving on to different weight loss remedies. Good luck everyone!

    • up you food intake a little, add more protein it will really make a difference

  5. I take 37.5 on an empty stomach first thing in the morning and can go back to sleep an hour later. It used to work years ago but now they are made differently and have no effect. Unfortunately, It\’s been a waste of money.

    • I feel the same as you do about it. I took the 37.5 mg years ago & lost 40 pds but I recently started taking it again & it’s giving me no energy at all! So disappointing.

    • I agree with you too Anna. I took the 37.5 mg 1 time daily 10 years ago. In 1 month lost 30 lbs. Total weight loss was 62 lbs in 3 months. I was given the same dosage last Friday. It doesn\’t feel / do the same as before. They have definitely changed the ingredients. This was such a big disappointment. I was also told by my doctor that the generic was only 75% adipex and the other 25% was a fill in( which is allowed by law) so i decided to buy the name brand that is 100% adipex supposedly (which was twice as much). Still nothing. I feel its def a waste of $$.

  6. I agree with Anna. Not only does it NOT suppress my appetite anymore, but it also makes me feel weak and tired, too tired to exercise! I just took one and an hour later I was STARVING. They have definitely changed the ingredients from what it was years ago. We are not stupid Big Pharma. We know what you are up to. Thin, healthy people is not where the $$ is at. The $$ is with the diabetic industry and cholesterol drugs, high blood pressure meds, etc. Phentermine (or whatever this junk really is) does, however, still give excellent results in the insomnia dept.which makes it even HARDER to lose weight because insomnia slows the metabolism further. Sure wish I could just go to Walmart and buy some EFFECTIVE Metabolife 356 or Stacker ephedra pills that actually worked but supposedly killed one or two athletes who took too many while drinking poisonous aspartame sodas (prob the real culprit). Meanwhile, Big Pharma drugs kill over 200 THOUSAND AMERICANS EVERY SINGLE YEAR. What blatant hypocrisy and perverse banality. Thanks F.atal D.rugs A.llowed agency.

  7. I just started taking it on Monday 37.5 mgs and I keep waiting 3 days later for the big burst of energy-nope hasn’t come! I haven’t been alert or awake like everyone says I should be-in fact I’m MORE tired then I was before taking it! I never had trouble sleeping before. As far as the curbing of my appetite goes the 1st day I barely ate that much for my meals but since then it seems 3 days later and I’m eating like normal-I’m having chest pains on my heart area. I am starting to think this was a waste of money-but I will give it some time b4 I quit bc I really need to lose this weight!

    • Hey Skyeblu,
      You’re experiencing the serious side effects of phentermine with the chest pains and seeing none of the benefits, you really must speak to your doctor about this – he or she may advise you to stop taking them due to the chest pains as these are very serious.

      • Sally, I find it interesting that you had no response to any of the posts with problems and issues, but jumped right on the one that would have a negative affect on your company. Seems to me everyone on this site posts in hopes someone from your company may have answers for them!

        • Hi Linda,
          Actually, this site is just an information site related phentermine – we do not make or sell phentermine, so a comment like this would not have a negative effect on our company. We try to be informative, helpful and not biased as we recognize that phentermine can be effective for some but necessarily for everyone. I answered the post by Skyeblu because she said she was experiencing chest pains, which is a serious side effect – I was trying to urge her to see her doctor out of concern for her as this is not something which can be ignored. If I see a comment like this then I can’t just approve it and not respond. If there are specific questions which I feel are directed to our site then I answer them, if I feel it is directed more at other phentermine users then I generally leave other people to comment with their experience of taking phentermine, since I have no personal experience of taking it myself.

  8. Hi my name is natasha. I started duromine low dose 15mg a month ago and barely lost any weight, the doctor gave me a prescription for 30mg and so far its been 6 weeks and lost a total of 5kg that’s it don’t really have side affects except I’m always thirsty and have so much energy I have this buzz constantly and I’m very alert don’t do much exercise just daily work and around the house. My current weight is 75kg. Can someone explain to me even with this much energy and alertness, why the slow weight loss? I also eat 3 healthy small meals a day all protein and fresh fruit and vegetables and 3l of water daily! I’m muscular build but have lots of flabby muscle I am overweight and need to loose 10kg more.

    • Hi Natasha,
      Firstly, losing a total of 5kg in 6 weeks is great – this is 11lbs, so that’s close to 2lbs per week, which is the recommended rate of weight loss to ensure that you’re losing fat and not precious muscle. However, if you wanted to boost weight loss then we’d recommend you to increase the amount of exercise you do – having lots of energy doesn’t cause weight loss directly, the idea is that the energy gives you the motivation to exercise which then leads to an increased calorie and fat burn, and a more efficient body. If you’re muscular then you should find it easier to rebuild your muscle and lose the flabbiness, so we would recommend that you do a mix of cardio and weights to help increase metabolism and get you losing more weight.

  9. I am a 68 y/o female, who has been experiencing extreme fatigue, and sleeping way too much. I have been complaining to my doctor about this for about a year now. Today, my doctor prescribed phentermine 37.5 mg once daily, but she also prescribed effexor xl 75 mg for me. I only weigh 128 lbs., so my only need for the phentermine 37.5mg, once daily, is to help increase my energy level. I am concerned about taking the phentermine and effexor both! I am also taking vitamins B complex sublingual, and vit. D. The white oval pill I received for phentermine 37.5 mg, is solid white, with inscription K 25 written on it. I cannot find any information about it. Any suggestions?

    • Hi Doris,
      Although phentermine does boost energy its main effect is to suppress appetite, so this doesn’t sound like the solution to helping you with your fatigue to me – I would have thought there would be other options to pursue before resorting to phentermine. In addition, if you are a healthy weight it could be dangerous as with a suppressed appetite you are likely to lose weight, which in turn is not likely to help increase your energy levels. I’m not sure what tests you have had but anemia, thyroid issues and vitamin deficiencies are all potential causes of the symptoms that you’re experiencing, so if you haven’t been tested for these then I would request tests from your doctor.
      Hope that helps,

  10. I am a 53 yo who was prescribed 37.5 mg. I take half, for just 2 days now. Wow! I have so much energy! I cleaned and organized a very large “to do” stack in my office that had been accumulating for a year. I have lost 2 pounds, and seem to be attracted to healthier foods while my mind has stopped thinking about food all of the time. My question. Is there a smaller dose, because even just taking half, I had periods where I wondered if was safe to drive, because my mind was so active with multi tasking, I was “space”.

    • Hi Lisa,
      Yes there is a 15mg dose but this is only available in capsule form. The pills are only available in the highest dosage of 37.5mg. Be sure to only do what you feel comfortable doing and don’t take risks if you feel light headed. These effects should lessen over the next few days though, so you shouldn’t feel such a strong reaction within a week or so.

  11. I take a diet pills RX and with that my doc have me Phentermine 37.5. I have NO side effects at all, no energy, nothing. I could take the Phen and still go right to sleep. I drink a strong large coffee in the morning, then diet pill, then at 11:30a I take the phen. nothing no energy at all, at 2p I take my second diet pill.
    By the end of the day I could go right back to sleep ( I mean like by 4p or 5pm.)
    Am I doing something wrong???

    • Hi Liz,
      You’re not doing anything wrong – not everyone gets a boost of energy from phentermine and some people find that they are actually more tired, as we explain in this article: If you’re just starting out on phentermine then the energy boost may come in time, but if you’re still feeling sleepy within a few hours of taking phentermine after a couple of weeks then you should speak to your doctor to see if there is something more suited to you.

  12. I took phentermine 37.5 15 years ago and I lost 60 pounds on it. It have gave me tons of energy and suppressed my hunger. Over the years I gained it back. Some due to unhealthy eating habits and other due to medicines I had to take for awhile and an early hysterectomy. My doctor put me back on them to help with the weight loss I need so badly. I was so excited and couldn’t wait to begin my days again with energy and feeling great. What a DISAPPOINTMENT!!! After not taking them for 15 years I thought it would feel like it did the first time I took them. I have NO increase in energy what so ever!!! All it does is keep me up. I can’t sleep and just sit on the couch praying I could because the longer I’m up the more likely I will eat out of boredom. I mean it gives me NO energy at all. I KNOW the maker of this pill has changed the ingredients and not informing anyone. I fought my weight on and off all my life and this was the only thing that helped in the past. Now it does nothing but causes sleepless nights!!! What have they done with the original pill???? Feeling hopeless.

  13. I have been taking phentermine for 2 weeks now, I have no energy, I feel like I have worse vision, not enough concentration. It\’s so weird I have taken it before and this has never happened. I am stopping immediately

    • Hi SG! We recommend you contact your prescribing doctor or physician immediately whenever you experience any possibly harmful or negative side effects; for the purposes of continuing your weight-loss journey, we also recommend Phen Caps, an efficient weight loss supplement and phentermine alternative with none of the phentermine side effects.



  14. Hello to my fellow \”Disappointies\” I started taking phentermine (Adipex) 15mg capsules January 4th 2018. Its 5 days later and im still not experiencing ANY suppressed appetite, no increased energy levels and im also tired throughout the day. I have no issues with sleep other than my normal bouts of insomnia that I\’ve been dealing with for many years. My doctor wanted to start me out with 15mg because my blood pressure was elevated at the time of my visit. I normally don\’t have an issue with high blood pressure so I\’m not quite sure why that happened. I\’m 37 years old and weigh 164lbs at 5ft 1in. I have fibromyalgia, lower lumbar degenerative disc disease and I was recently diagnosed with type 2 diabetes. So, my goal here is to shed as much of this sugar saturated fat from my body as possible, i’ve already cut out tons of sugar from my diet and I am hoping that the phentermine would give me enough energy to combat the extreme fatigue that i have..that way I can also start working out. If you guys have any suggestions on how to raise my energy levels and/or how I can reverse the type 2 diabetes while I\’m still in the infancy stage of it, I would be extremely grateful!! No question is a stupid question & no suggestions are stupid suggestions either!! This is extremely important to me for obvious reasons!! Blessings to all & thank you ♡

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