Phentermine and Nausea: What Users Say

• Kri...
• Taken for 6 months to 1 year
• July 19, 2014

Phentermine for Weight Loss (Obesity/Overweight) "I started off on the highest mg, which is 37.5, and it has worked very well for me. In my first month, I had lost 26 lbs, and in 6 months, I lost a total of 90 lbs. I DID NOT EAT HEALTHY NOR DID I EXERCISE. I took a break from it a couple of months back because it's not safe to take it for an extended period of time due to the fact that it takes a toll on your liver. I just got back on it again yesterday. It will cause you to have DRY MOUTH, CONSTIPATION, URGES TO DRINK LOTS OF WATER, ENERGY, ABILITY TO STAY FOCUSED, INSOMNIA, FAST HEART RATE, MOOD SWINGS, NAUSEA, AND EASES BODY PAIN. I have a heart murmur and panic attacks, so after taking this medication, I notice it gets harder for me to breathe as the day goes by."

• Jan...
• Taken for 2 to 5 years
• January 4, 2025

For Weight Loss (Obesity/Overweight) "Best weight loss medication available. For me, the side effects were very little. Drink lots of water, and include lots of fiber. I use Metamucil orange flavor fiber 3 times a day along with green veggies. I love the appetite suppression as it helps you maintain a healthy eating pattern and is carried on after completing the medicine. Exercising 4x weekly and eating well, I lost 15 pounds the first month and 12 pounds the second month. Highly recommend. My days are very long, I didn’t have any issues sleeping. Also, make sure not to take it too late in the afternoon or you will experience trouble sleeping. Unless you’re planning an intense workout, I do not suggest taking this after 3 p.m. If you find yourself nauseous during exercise, eat half a plain bagel, no toppings, before your exercise. You’re most likely not eating enough and extra acid in the stomach."

• hap...
• Taken for 1 to 6 months
• May 13, 2015

Phentermine for Weight Loss (Obesity/Overweight) "Fastin is an excellent dietary supplement for me. In the morning, right as I wake up, I take the little guy. The pill tastes like what I would imagine what baking soda would, but oh well, I am not sucking on it. It takes about 20-30 minutes to give the first kick. That kick is the rush that says 'I need to get moving or I need to get to the gym.' The first time I took the pill, I did get a little jittery and nauseous, but once I started working out and drank water, I started to feel fine. About an hour in, I hit phase 2. Phase 2 is the spunk and mood booster. I feel awesome and amazing like I know what I am working for. Again, the first day I felt a little dizzy and euphoric. Then there is phase 3, the come down. Drink water and eat a solid. I lost 100 lbs."

• Ali...
• April 3, 2014

Phentermine for Weight Loss (Obesity/Overweight) "I've been on this medicine off and on for 6 months. I've lost about 30 pounds. My cycle is 1 month on and one month off. If you take it more than a month, your body gets used to it. I have found giving the body a rest and allowing the metabolism to adjust without works best for long-term weight loss and maintaining. I started at 180, currently at 150. I get bad side effects, but seeing the scale move and clothes fit motivates me to move on. If you exercise with this medicine, it can make you nauseated and cause vomiting. Exercising first thing in the morning, then taking the medicine, works best to prevent nausea and vomiting. Also, I find it important for users to change eating habits. Suggest clean eating 6 days on, 1 day off."

• Dra...
• Taken for less than 1 month
• August 25, 2014

Phentermine for Weight Loss (Obesity/Overweight) "I started Adipex on 8-18-14, and today is 8-25-14. I am down 8 pounds in a week. I hope this kind of weight loss continues, but I'll have to wait and see. I did experience a little bit of nausea for the first few days, but it wasn't too bad, and dry mouth a little. So far I am pretty pleased."

• Ind...
• April 5, 2015

For Weight Loss (Obesity/Overweight) "Started phentermine by my new Dr on 4/1/15, 286 lbs. Will weigh again in a week but so far I have no food cravings lost most of my appetite. Only eat 3 small meals. I feel a little nauseous when I think about eating. I have tons of energy, but when it is time for bed, I can't sleep. If I knew this pill was so effective, I would have started when I was 230 lbs. I don't know why my old Dr never recommended it. I'm really excited, and I promise to keep you posted."

• MKm...
• Taken for 1 to 6 months
• May 17, 2016

Phentermine for Weight Loss (Obesity/Overweight) "Been on generic Adipex for 1 month. Start weight 183. Current weight 171. Drink lots of water on this. Dehydration can cause headaches (I get migraines already, so this did not increase due to the medication). The first day I was nauseous. The first week was extreme dry mouth and complete lack of appetite. I had to remind myself to eat during the first week. At some point during the second week, I was feeling a bit hungry but not the constant hunger I experienced before. As of the end of the first month, the only persisting side effect is the dry mouth. I'm also not sleeping very well! But I just take Tylenol PM for that. Overall, I feel good. I'm losing weight. I'm less hungry, so I'm selecting better food choices. (Chocoholic lol) and no serious issues."

• Neq...
• Taken for less than 1 month
• November 15, 2014

For Weight Loss (Obesity/Overweight) "I've lost 10 pounds in 5 days. My start weight was 185, my current weight is 175, and my goal is 145. On my first day taking it, I was very drowsy, but now the only side effect I have is nausea, and it's only around the time I would normally eat."

• hop...
• June 14, 2014

For Weight Loss (Obesity/Overweight) "I had been so upset with myself and couldn't even look in the mirror without total letdown after gaining a massive amount of weight within the last 2 years. I am 5'9" and as of 4 days ago I weighed in at 251. I begin phentermine on Tuesday and as of today (Saturday, 6/14/2014) I weigh 240 pounds! In 4 days I've dropped 11 pounds. I take 30 mg in the morning and I do feel jittery, nauseous, and clammy here and there, but I realize if I eat a few peanuts, peanut butter, apple slices, etc., I feel much better. The pill definitely curbs my appetite the whole day, and I force myself to eat, and when I do, it's very light. By dinner, I am hungry and do eat what I want, but my portions are smaller and smarter. I also have cut soda and sugary drinks."

• Hol...
• December 17, 2019

For Weight Loss (Obesity/Overweight) "I've been taking phentermine 35 mg for 3 months, and I go today for my 3rd weigh-in. I've lost 29 pounds in 2 months, today I'll know how much I've lost in 3 months. I'm loving this diet pill. I thought I'd never lose weight. Before, I was obese, I was huge-255 lb, my biggest ever, and I'm only 25 years old. I've made a lot of changes. I'm always full of energy now, when I used to sleep all the time because I didn't have any energy. I've gotten people interested in taking it too. One of my friends has gotten approved to take this diet pill and is having problems with it, but I'm loving it. The only downfall is constipation-really bad-and, of course, nausea all the time. Sometimes I have to make myself eat because I get distracted because I'm full of energy. I will update in 6 months."

• the...
• July 28, 2009

Phentermine for Weight Loss (Obesity/Overweight) "I'm 25 years old and I have had a weight problem my entire life. For the last 8 years, I have lost and gained weight like crazy. My doctor put me on T-Diet 30mg on April 1, 2009, when I hit 292 pounds. I am currently on the 37.5 mg Adipex tablet, and I am down to 244 pounds. I feel phenomenal. After learning I had an underactive thyroid about a year ago, I had really started to feel like crap every day, and the weight just kept packing on. I feel 16 again and more self-confident. The worst of the side effects were the dry mouth (chew sugar-free gum to help), nausea at first (take an antacid), headaches at first, increased anxiety (totally worth it anyway), constipation, and I am easily agitated. Good luck."

• Lau...
• Taken for 1 to 6 months
• July 30, 2014

For Weight Loss (Obesity/Overweight) "I have had a lot of success with Phentermine 37.5 mg. The first time was 3 years ago when I lost 30 pounds in 2 months. I am 5'3" and weighed 180, and after 2 months on Phentermine, I was at 150. This time I am 45 years old and started out at 165, and after 1 month, I weigh 150, so I have lost 15 pounds, which is the same rate I lost the weight before. I do take the pill early in the morning around 6 am, if I do not, I do experience insomnia. I get full very fast, after only taking a few bites of something, I am done, or I become nauseous. Phentermine has also caused me to have a dry mouth, you just have to drink a lot of water, which is good for you anyway. All in all, my experience has been very good. It does really work. Just have a physical first."

• Zul...
• Taken for less than 1 month
• March 7, 2017

Phentermine for Weight Loss (Obesity/Overweight) "I started Adipex last Tuesday, 2/28/17. My starting weight is 208, today, 3/6/17, my weight is 190.3. I'm amazed with this pill. The first day, I felt a very slight headache, I thought it was because I didn't have my regular cup of coffee, so I had one. I experienced slight nausea, but it didn't last long. It's amazing how my appetite has decreased, and I can't eat my meal completely. Until yesterday, I didn't even feel hungry. Today, I felt hungry around 10:30 AM and ate just a 1/3 of a protein bar. At 12, I had half of the leftovers from yesterday's dinner because I had no desire to finish. I'm very happy so far. Also, I have no problems sleeping. I take my pill every morning at 7 and eat a protein bar for breakfast an hour later with 16 oz of water. Total: 10 daily."

• Bec...
• Taken for less than 1 month
• August 1, 2019

Phentermine for Weight Loss (Obesity/Overweight) "Fastin is really a great appetite suppressant! I have taken it for a few days. Yes, it does make you jittery, and your heart rate is increased, but for me, it wasn’t overwhelming. Unfortunately, the only reason I couldn’t give it a 10 is because I do feel nauseous throughout the day, which makes me not want to eat any food and drink tons of water!"

• Nie...
• Taken for 1 to 6 months
• July 4, 2019

For Weight Loss (Obesity/Overweight) "Phentermine has given me the life-changing boost that I've needed. I won't lie, when you first start taking it, it almost makes you want to stop because it makes you feel like you can't concentrate or sleep. You have to help your body adjust to it. I started off with half a pill each morning and 1 bottle of water, then I would eat breakfast about an hour after. This gave my body nourishment so that I would not feel nauseous throughout the day, and I wasn't hungry after that. Depending on your line of work, you may even 'forget' to eat, but DRINK WATER THROUGHOUT THE DAY. When someone complains of fatigue or headaches, this is why! You MUST stay hydrated or you'll have severe cottonmouth too. After about 2 weeks, I was able to take a whole pill. I also changed to clean eating as well as working out. So far, I'm almost down 15 lbs from 211 lbs in just 1 1/2 months, which is a big deal for me. It's definitely worth it, but you have to be committed to the change!"

• Cur...
• October 10, 2013

For Weight Loss (Obesity/Overweight) "I have been on this medication for a little more than a week. I have lost about 12 pounds so far. I think it's important to note that everyone experiences the medicine and side effects differently. Some of these reviews would lead people to believe that your cravings go away entirely. For me, they haven't. But seeing the numbers go down on the scale when I make good choices has given me the confidence and support I need to resist the diminished cravings I have. As for side effects, I had 3 days of really bad nausea and stomach cramps about 2 days after starting the medication, but it resolved itself. No insomnia or jitters. A little dry mouth, but nothing unmanageable."

• Anonymous
• Taken for 1 to 6 months
• March 18, 2015

Phentermine for Weight Loss (Obesity/Overweight) "I was personally not on this pill, but my mom was and currently still is. Though she has lost about 20 lbs in the last month or so, she has been experiencing side effects. First off, she's had severe headaches since starting the medicine. She's had extreme mood swings and is very nauseous and dizzy at times."

• Lin...
• Taken for less than 1 month
• August 24, 2013

For Weight Loss (Obesity/Overweight) "I've been taking phentermine for 1 week, and I've lost 15 lbs. Day 1, I weighed in at 271 lbs, and exactly 2 weeks later, 256 lbs. I've weighed in almost every day because after the first day, I'd lost 5 lbs, and I couldn't believe it. I feel nauseous a lot and don't desire any food, but overall I'm having a good experience."

• DJa...
• Taken for less than 1 month
• July 5, 2021

For Weight Loss (Obesity/Overweight) "I am 39, 5'5, 230 lbs. I started 37.5 mg phentermine on July 1, 2021. I haven't been hungry since that first day. I'm perfectly content to fast, so I'm okay with it. I ate a little bit for the 4th of July, and 4 bites into the green beans, I became nauseous (did not throw up), so I stopped trying to eat. According to my home scale, I'm down 10 lbs. I felt the energy and clarity also right away. I'm type 2 diabetic and always felt like I need a nap. I take my pill at 7-8 am, and when I lay down between 11 pm to midnight, I go right to sleep."

• jes...
• July 1, 2011

Phentermine for Weight Loss (Obesity/Overweight) "I started Adipex June 17th, and it's now July 1st. My starting weigh-in was 268, and 2 weeks later I weigh 240. I take half a pill when I wake up, then another half around 2 PM. It has suppressed my appetite so much it's crazy. I never realized how much I was eating before. It is important to exercise regularly. I have noticed with this pill that just looking at carbs makes me nauseous. I love lasagna, and my mother made some, but I just couldn't eat it. Also, I have been drinking a ton of water because the dry mouth side effect has hit me hard. Overall, yes, I am excited with my weight loss. I just hope it keeps up at this rate. 100 lbs to go!"

• Twe...
• Taken for less than 1 month
• September 27, 2016

For Weight Loss (Obesity/Overweight) "I started Adipex, generic phentermine 37, on Tuesday, 9/20/16, at like 6 PM. First mistake... so I was up all night, literally. I didn't sleep, actually, I haven't slept more than a couple of hours at night all week. Definitely lots of side effects: heart beats abnormally sometimes. I also feel very alert. I took my 2nd dose on 9/23/2016 in the morning. Starting weight was 223 lbs, I'm at 213 today, 9/26/2016, so I lost 10 lbs in 6 days. I get nauseous by the smell of most foods, I can barely eat. I have absolutely no appetite. I have major constipation, but I'm losing weight, though. So my ultimate goal is 160. This is my 2nd time on the medicine, and I lost about 30 lbs the first time back in 2012, so wish me luck. I will try and update again soon."

• Sav...
• Taken for less than 1 month
• June 16, 2021

Phentermine for Weight Loss (Obesity/Overweight) "The first day I took this medicine, I had so much energy and was extremely focused. The second day was a little different (I am prescribed the dosage of 37.5 mg/day). The second day, my appetite was gone all day, and toward the later afternoon, I started throwing up. I could not eat any food that day. Now comes day three, I take the medicine again, hoping that I wouldn't have the same reaction as the day before, and I was right, but everything worsened. I still haven't gotten my appetite back, and I've thrown up seven times today and cannot hold any water or anything down without throwing up two minutes later. I haven't had food in two days because of the constant nausea and vomiting. If you have a sensitive stomach, beware."

• Tex...
• Taken for 1 to 6 months
• February 20, 2016

For Weight Loss (Obesity/Overweight) "I have 50 pounds to lose. I am 57 years old, weigh 194, and am 5'7'' tall. My weight on Dec. 18, 2015 (two months ago) was 220 lbs. I am going to Jenny Craig to maintain a balanced diet of 1,200 calories/day. I know this medication works with close medical supervision and no high blood pressure or heart disease. I have lost weight successfully and for a long period of time using phentermine. I am a nurse without high blood pressure, known cardiac disease, or other risk factors. I tried Contrave, and although there was moderate weight loss, the nausea was too severe to continue. My doctor and I have seen great results with phentermine, which is a very old, generally safe medication. PLEASE get a physical exam before starting the medication and every month check-ups to monitor health. Go for the loss!"

• Sem...
• Taken for 1 to 6 months
• April 13, 2017

For Weight Loss (Obesity/Overweight) "I'm 40. 5-11, 290 male when starting phentermine 37.5 mg. I figured I better post and help someone maybe not go through what I went through the 1st three days. Take on a full stomach!!!!! I took this med on a semi-empty stomach the first 2 days, and I thought I was going to come out of my skin, it was a horrible, horrible feeling like I never felt!!! I stopped my dose after day 2, and it didn't wear off for another full day, and I slept 1 hour in those 3 days!!!!! So, day 4, I tried on a full stomach, and no problems, just the normal bad cotton mouth. I work swing shifts, so I learned if you're going to take this med, take it as if it's not going to wear off for 16 hours. If you do this, you'll be able to sleep, if not, good luck lol. Lost 18 pounds this month."

• Jod...
• March 10, 2017

For Weight Loss (Obesity/Overweight) "Started taking phentermine 37.5 on 3-6-17, weighing 274 lbs. I'm 5'3, 40 yrs old. As of today, 3-10-17, I weighed 266 lbs. It definitely kills the appetite and keeps you energized. For the past few days, I have had severe nausea coming and going. Due to the results I am seeing, I must push through. I have had no success in the past with all of the 'other' dieting solutions. I'm currently taking 1/2 a pill a day instead of 1 tab a day. Trying to see if it will calm the nausea. Looking forward to keeping you all updated. Best of luck!"