Home > Diets > Diet Supplements Diet Navigation    
User Rating

This diet does not have a rating because it does not have enough votes.

+ - Tried it? Rate it!


An FDA approved diet pill for obese patients.

Top Rated Diet Pills of 2024
QUICK FACTSQUICK FACTS Start the Diet Now Advertisement
  • Established: 1959 FDA approval; available in the 1970s; removed from the market voluntarily in 1997 but still available
  • Founder: Originally sold by King Pharmaceuticals; currently made by several companies
  • Accessibility: Prescription only
  • Diet Type: Appetite suppressant to be taken short-term
  • Gender: Male and female

Do You Know the Best Diet Pills of 2024?


Phentermine is a short-term prescription appetite suppressant that works by stimulating the hypothalamus gland and affecting neurotransmitters in order to decrease your appetite. The hypothalamus gland is the portion of the brain that controls many functions, including your appetite. Combined with proper nutrition and exercise, you can see weight loss results

  • Phentermine is given under doctor supervision
  • Formulated specifically for the obese
  • Documented success stories
  • Suppresses appetite
  • Short term help to lead you to eat healthy and exercise
  • FDA approved
  • Generic version available which is cheaper than name brand

  • Phentermine has the potential of many serious side effects, including: chest pain, fainting, swelling of feet or lower legs, trouble in breathing, among others
  • Currently available by prescription only
  • Not a long term solution
  • Side effects of dry mouth, blurred vision, constipation
  • Phentermine Hydrochloride (HCL), along with a host of non-active ingredients.

Your doctor will decide on your dosage and instructions for taking Phentermine when giving you the prescription. The average dose is 30mg of Phentermine per day, but some patients are prescribed to start off with 15mg per day.


It is recommended that you incorporate diet and exercise into your plan when taking Phentermine. Phentermine is a drug to be taken only on a short-term basis. After six to 12 weeks, you are advised to discontinue taking Phentermine, and continue with your diet and exercise plan to reach your weight loss goals. Phentermine is only intended to help the obese kick start their weight loss plan while they become used to following a low calorie diet and exercise plan.


When you're talking about a prescription weight loss drug, you have a product reserved for people with the most dire of needs. So, obviously this is not for everyone. If you have health problems related to obesity, and you fell you need help in getting some of your weight off, consult your doctor about Phentermine.

Common MisspellingsCommon Misspellings

fentermin, fentermine, phentramine, phenterthin

How Does Phentermine Compare?
  • Product Name
  • User Rating
  • Has Good Appetite Suppressant
  • Has Only Natural Components
  • Contains No Coffee
  • Phentermine
  • /100
  • .
  • .

> Leave Feedback

User Feedback

(Page 4 of 13, 252 total comments)



Started phentermine on October 5, 2011 I weigh 257.4 and height 5'3. Weighed in today cause i was curious October 8, 2011 I
weigh 251.4. Wow I am really impressed. cant wait to weigh again in a few days...

posted Oct 9th, 2011 1:44 am

nancy burris


Really works. Only took about a months worth. But got off, maintained diet & exercise. Down 40 lbs. Kinda starting to plateau but I look GREAT!!!

posted Oct 5th, 2011 4:41 pm



Just started taking Phentermine and so far it is doing it's job. I'm one of those people that is constantly hungry. Food is delicious and I can't get enough. Since I've taken Phentermine, I haven't been craving the junk food. I have probably eaten as much in the last three days as I would have eaten in one day. Not that I ate THAT much, I just really haven't been hungry enough to go find something to eat. I'm really happy. I had tons of energy during my daily Zumba workout as well. Can't wait to see the pounds fall off!

posted Sep 29th, 2011 7:54 pm



I have been on phentermine since 9-9-11 and I'm down 10lbs! I had little headache the first week but after that I haven't had any headaches and I use to get at least 2-3 a week. I have a thyroid problem and was feel so dead even being on thyroid pills but since I started taking phentermine I feel like me again! And after reading a lot of other people's reviews I was worried I wouldn't sleep but I have been getting the best sleep! Only side affect I have had was dry mouth and little moodiness (easily irritated from time to time). Over all I feel so much better and can't wait to lose more weigh!!

posted Sep 26th, 2011 9:10 pm

jenny o

Can i get this pill prescribed through my doctor

posted Sep 19th, 2011 11:15 am

jenny o

is this pill available in canada?

posted Sep 19th, 2011 11:11 am



How do you sleep on Phentermine?? I took 15mg for about 4 days, the side effects were fairly mild, but the worst was that I could not sleep. I ended up having to drink, so that I could relax enough to go to bed. I knew I could not continue like that, although I was seeing results. Is there any solutions for sleep aids/sleeping? Should I ask my doctor to decrease the dose? I am currently 5'2 153lbs goal - 130lbs.

posted Aug 30th, 2011 5:36 pm


I have been using 37.5 Phentermine for about 7 weeks now. I have been very overweight for my whole life. I was 6' 326 when i started. 7 weeks later i am down 28lbs and feel like a different person already. You have to want to change your life when you start this. Everyone asks me if I'm on a diet and I tell them no, I have done a lifestyle change. This is critical becasue diets end and you will more than likely go back to bad habits if your not commited.

posted Aug 25th, 2011 10:28 am


My doctor gave me phentermine about a week ago and it absolutely does nothing for me. About three days ago I started taking 2000 mg.of vitamin B-12 with it and it still does nothing! I really thought that this was the final answer to my losing 40 pounds. Help, I do not know what to try next!

posted Aug 14th, 2011 2:59 pm


I will be starting Phentermine next week 8/29/11 and I am 5'8 and 205 lbs.

To be considered 'healthy' I need to be no more than 170. While that is my goal, I would love to eventually reach 155-160. I live in MD and will be going home for Xmas this year in CA to see all my family. I am hoping to show great results by the time I go home so I can surprise everyone.

I am excited to see results much faster than anything I've ever done in the past. I'm also a little nervous about the idea that I might actually drop a considerable amount weight. It's been almost 9 years (and 3 children) since I weighed 160 and I don't have any idea what I'll look like anymore at that weight.

I've read extensively about this pill, its side effects and numerous results and I am completely willing to dedicate myself to making all the tests and effort it took to get the prescription, worth every minute. I plan on continuing and increasing my exercise and watching my diet to make my 'healthy' goal.

All I have left to say is: "BRING IT ON!"

posted Aug 13th, 2011 6:36 pm



Second day, have some side effects but am also taking another pill that increases those effects. I expect to level out within the next week. Drinking tons of water, not hungry at all. Like another person wrote, for the first time in my life I am not consumed with obsessing over food. I have energy, but my heart rate is up a little. I am still in the normal range. My blood pressure is borderline, but once my body regulates to the meds, I will be in the gym again. I don't crave junk food or alcohol at all. I do crave salads, and sometimes whole wheat bread or a breakfast bar. I have lost 4 lbs already. I have a LOT of weight to lose. As has been stated, this is NOT a long term solution. This drug is about creating healthier living habits. Healthy food, exercise and moderation in everything. I love it so far.

posted Aug 11th, 2011 5:22 pm

robert m.


I am 21 years old, 6"0 and started phentermine at 229 lbs. Started March 2nd and ended May 26th my personal goal was 170 and I made it to 178. Phentermine definitely works, its amazing if used right with diet and excersize it'll definitely help you lose weight. it changed my life, and even off the pill I have managed to continue losing weight with the diet and excersize plan I did whil on the pill. As for side efffects, for me, they were really severe the first couple of days but after that it was barely noticeable. The only caution is, you will lose so much weight people begin thinking you are doing drugs! Very aggrivating! Good luck on everyone starting their weight loss journey. I will tell you this, its much more of an emotional ride rather than a pyschical one. Thus far I have lost 54 lbs and am a completely different person, socially.

posted Jul 25th, 2011 11:57 am


I am severely overweight. I am 5'8 and 315lbs. I just started taking Phentermine two days ago. The doctor started me on 15mg for a month and then go from there. I am starting to drink lots of water and getting my eating portions in half. The only thing I still have cravings but I think that is because I am on such a low dosage. My goal? I just wanna lose enough weight to play with my boys. They are very active! I am shooting for 30lbs at first and then go for 50lbs.

posted Jul 16th, 2011 1:49 pm


Been taking phentermine 37.5 for about a month and a half now. Only down about 7 lbs. :( I eat very carefully and exercise everyday, lift weights and cardio. Seems others have much better results. I am wondering if anyone else suffers from hypothyroidism?? I do and take meds for that as well. Dr said birth control pills may be making it harder for me as well. Any others with experience with this, your thoughts would be greatly appreciated!!

posted Jul 12th, 2011 11:35 am

Holly Bee

I have been on Phen for about 3 weeks now (6/27/2011) and have lost 16 lbs! I started out on the 37.5 mg but decided it was a little too much. I had absolutely no appetite and if i did eat, it was veggies and fruits and an occasional peice of lunch meat. Going to the gym and doing cycling classes and zumba was just to much to do on that little bit of nutrition. I was getting sick after workouts. So i decreased my dosage of Phentermine to 15 mg and am still losing the same amount of weight a week. Starting this medicine has motivated me so much! I feel great on the new dose with the excersize. My goal is to lose 50 lbs. I started out at 206 lbs and am down to 190 :)

posted Jun 27th, 2011 1:31 pm


I started out on Phentermine 15mg 1xday since Feb 22, 2011. Today is 06/09/2011 I have lost 39lbs and have now switched to 2xday, but I dont always take the 2nd pill. I really am happy with my weight loss so far. I hope to lose 100lbs using phentermine. Once I lose the weight, I would like to start using exercise to maintain the weight. Which shouldnt be to hard, bc I have learned how to eat..what works and what doesnt work as far as weight loss. Phentermine is awesome and I would suggest it to anyone that needs to lose weight.

posted Jun 9th, 2011 10:21 am user comment


Female wt 196 ht 5'2 started date May 30, 2011. Today wt 191.2 ht of course still the same lol 5'2. My goal weight is to get back down to 160 yes I know thats still over weight for my height and age 20 something but that's my goal since I haven't seen 160 not even 189 in over 5 years. So, this is a big step for me. I am currently taking phen-8mg twice a day sometimes once a day. I know you guys are saying, 'why 8mg?' well, I was taking phen-37mg but due to the side affects (appetite suppressant ) I wasn't barley eating a whole apple...I went from eating popeye chicken, pizza, banana pudding, chocolate cake, chocolate ice cream, pasta and cheese cake, which is all my favorite foods, to eating three small light meals which I have to force my self to eat and fruits to snack on in between. I do 15 min of cardio everyday and here I am today Sunday June 5, 2011 weighing 191.2 pounds yeeee! Phen is definitely a miracle pill for me.

posted Jun 6th, 2011 12:27 am

Shana Estrada

I was on Phentermine about 7 years ago. I had tried every diet and diet pill and aid up to that point, with no success. Many of the OTC diet pills made me "shaky" and "jittery" and sick to my stomach. I lost approx. 15 pounds back then within about 2 months and never experienced any major side effects. The only effect I encountered was dry mouth. I was on the 30 mg. pills. I have since, in the past 7 years, put the weight back on and then some. But, I did not gain the weight back immediately after stopping the pill and I gained it back because I went back to unhealthy eating habits and no exercise. My new dr. is starting me on the 15 mg pill now. I hope I have as much success this time around as I did last time. I'm looking to lose about 22 pounds and have a new healthy routine of eating.

posted Jun 3rd, 2011 3:24 am user comment


I have been on Phentermine in the past and lost 40 lbs. I am back on it and just got weighed in after 4 weeks and have lost 16 lbs in 4 weeks! I walk daily about 1.50 miles on my treadmill and have cut my portions in half. I have find that if you cut certain things out of your diet you crave them more, so just eat smaller portions so you can still enjoy those favorite foods. I go back to my dr in 3 months.

posted May 26th, 2011 10:02 am

azucena bruzon

im about to start taking the pill. i am very exicted. i have been struggling to lose 30 pounds forever now!! i dont like having the jitters but my doc said it will go away in a couple days. me so happy, hope it works and i dont gain it back

posted May 16th, 2011 3:45 pm


Leave Feedback

Or, proceed without an account


Already a member?

Whats better than