Phentermine and Increased Heart Rate: What Users Say

• She...
• May 20, 2019

Phentermine for Weight Loss (Obesity/Overweight) "It does work. You have to work with Adipex though. You have to stay hydrated. You have to eat at least 1000 calories if not 1200 daily. You have to exercise a little. Even if it is just walking. You need to also take it very early and take it around the same time each day, like 6 am or 7 am. I would not go past 8 am if you are sensitive to medications. Otherwise, you will be up all night long, ready to run around. You also need to change the foods you eat. We are fat because of what we eat. This is not a magic pill that will melt your fat away. You need to correct yourself for it to really help you on your weight loss journey. This is all common sense. It raises your heart rate up (it's almost like speed). That is what gives you the energy that we are all lacking. For me, Adipex is a fantastic appetite suppressant. Good luck."

• 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."

• Chu...
• Taken for less than 1 month
• February 10, 2020

For Weight Loss (Obesity/Overweight) "Update, (I did a review on 2020-01-23). I have been taking phentermine now for 30 days. I started out at 316 pounds. As of this morning, I weighed in at 295. I’ve lost 21 lbs. I am 49 years old and 6’ tall. I am surprisingly ecstatic over my results. As far as side effects, I actually haven’t experienced any. The very first day I took the medication, I did have a mild increase in heart rate. I know that the medication will react differently with each individual. But so far, mine has been nonexistent. I will check back and give an update in another 30 days."

• tri...
• Taken for 5 to 10 years
• January 25, 2014

Phentermine for Weight Loss (Obesity/Overweight) "I have been taking Adipex for about 5-6 years. All I can say is that some of you will feel bad or very bad after taking it but most importantly, it is to take vitamins and minerals along with Adipex. I had back pain, heart racing, and then even felt like my heart stopped for 2 seconds. It was scary but I started to listen to my body. I drank lots of water, ate loads of spinach and leafy greens, and took vitamins constantly. It is also strongly advisable not to eat any meat or heavy meals. Please remember that despite the fact that you get loads of energy, your bowels are sleeping, you can hardly feel any movement in your stomach. Phentermine is blocking the 'hunger center' in your brain. I hope it helps. I have reduced all the side effects I've had."

• Blo...
• January 28, 2020

Phentermine for Weight Loss (Obesity/Overweight) "I have been on Adipex for two weeks. My doctor suggested it to help me lose some weight. I was 200 pounds at the start. I am now 194 lbs after 2 weeks. I take a half pill a day. I work at a desk all day and would have issues with snacking all afternoon. Now I don't. I force myself to eat some fruit every afternoon or a protein shake. I can't eat a full meal because I feel fuller faster. I have more energy. I have had dry mouth, but drinking water is a big help with that, and I drink a lot more water. I do have some heart racing at times, but the more water I drink, the better that is, which is good because it did throw me into a few panic attacks. No headaches. I did get insomnia the first two nights, but I switched to taking the pill at 10 am instead of noon and that stopped. I started exercising so hope to see more weight drop off. My goal weight is 145, but I am only taking this until my bottle is gone."

• Cra...
• Taken for 6 months to 1 year
• January 8, 2020

Phentermine for Weight Loss (Obesity/Overweight) "I’ve been taking Fastin for about a year. And took it for a few months the year before. I love this medication. It helps me not be so tired. I take it as soon as I wake up, and I’m good for the rest of the day. When first taking it, make sure you eat a little something, otherwise, it will make you feel sick. It does make your heart rate go up. I don’t mind it because I know you have to get your heart pumping to lose weight. Went from a large 16-17 to an 11-12. 205 lbs to 160 lbs in the past year, and I’m only 5 ft 2 in. (I have large hips). It helps me have energy that I haven’t had since I was a teenager. And I only take one tablet in the morning. This medication is a blessing to me!"

• Ser...
• February 27, 2014

Phentermine for Weight Loss (Obesity/Overweight) "I just started using Fastin and I like it better than other diet pills I've tried, such as Hydroxycut, because it doesn't make me feel sick or nauseous. However, it definitely makes my heart rate skyrocket, so for the first couple of days, I would only take half a pill at a time. A full pill makes my hands tremble, and I can hear my pulse in my brain."

• Dee...
• Taken for 1 to 2 years
• June 29, 2019

For Weight Loss (Obesity/Overweight) "From 180 lbs to 135 lbs. I came off the pills for 8 months. Gained a lot back. Went to doc recently & got more. I usually take 1/2 pill but doc gave me capsules. When I started taking them, I felt awful. My heart was racing & I got very sleepy, which happens when your heart is overworking. It was giving me the opposite effect. I couldn’t sleep well. Since you cannot cut these in 1/2, I went back to doc for tablets. Took my 1/2 tablet & in only a few hours… I was again tired & had to lay down & take a nap. I had no idea what was going on so I hopped on Google. SOLUTION: I was NOT drinking enough water. Yesterday was my 1st actual day using Phentermine properly. I woke up, took 1/2 my pill, drank a bottle of water & kept sipping water. You know what? FINALLY ENERGY! I cleaned my house, yard, car. It worked! Now the weight should come off. Folks, learn from me. You must drink more water (or other no-calorie drink) for these pills to act as they should. Good Luck"

• Ano...
• January 29, 2021

For Weight Loss (Obesity/Overweight) "5'2", female, 28. Sedentary (desk job, gyms closed). Pre-existing PTSD, depression, and ulcerative colitis. 37.5 mg phentermine for 3 months. Doc did not stack it with fluoxetine or topamax as I'm already on 450 mg of Wellbutrin. After gaining 15 lbs in the first few months of COVID isolation, I decided to take this. Yes, I got the jitters for the first few days. Yes, it made me anxious for the first few days. Yes, my breathing pace and heart rate were up for the first few days. It went away. I didn't experience constipation per se, but I ate so little that bowel movements were few and far between. I took it between 6:30 am and 8:00 am every morning, otherwise I didn't get enough sleep. August 2020: 136 lbs, size 28/7 jeans, m/l shirts, 34B bra. November 2020: 112 lbs, size 23/3 jeans, xs/s shirts, 32C bra. This was combined with an Atkins variety keto diet, with 2 shakes and 1 big meal/day on most days. I kept my carbs under 20/day and struggled to eat 1200 calories."

• JJM...
• October 14, 2014

Phentermine for Weight Loss (Obesity/Overweight) "I am borderline average/overweight for a 5'3 woman. I just wanted to lose about ten pounds. Extremely effective, but as the other reviews state, two pills for me was way too much! Uncontrollable shaking, but the heart pounding was nothing less than frightening."

• Bes...
• December 30, 2015

Phentermine for Weight Loss (Obesity/Overweight) "Fastin, there's nothing like it. Amazing. You lose a pound a day if you eat breakfast, then take one, then lunch and another one, and drink a gallon of water a day. There's something with drinking that much water that allows you to drop a pound a day. You are going to pee every hour until the fifth day when your body gets used to a gallon a day of water... try it. When your heart races, take slow, gentle breaths until you feel your heart slow."

• Nur...
• November 8, 2016

Phentermine for Weight Loss (Obesity/Overweight) "I am a 32-year-old nurse and mom of 5. Before I started taking Fastin, I was 269 pounds. I'm only 5 feet 4 inches, so needless to say, I was huge. I was in size 24 jeans. I began taking these as a last-ditch effort to help me lose weight and feel better about myself. This week I weighed in at 187. (I recommend only weighing once a week on the same day before you eat or drink anything). I am now in a small size 16, which is big on me. I will agree that it makes your heart feel like it is going to pound out of your chest, but that is how I felt when I exercised. I would be huffing and puffing and barely able to stand. So I feel that in order to actually burn off the fat, you have to pump the blood harder and faster. Works for the obese."

• Ery...
• April 23, 2013

Phentermine for Weight Loss (Obesity/Overweight) "I started Adipex on January 15, 2013. I am 24 years old, 5'5, and my weight during that time was 259 lbs sadly. Today it is April 23, 2013, and I have lost 38 lbs! I have tried many other diet pills but never had any luck. I have tried to exercise and watch calories without the help of diet pills but it just wasn't working for me. Yes, there were side effects: high blood pressure/high heart rate (WATCH FOR IRREGULAR HEARTBEAT). If so, call the doctor that gave the medicine. As long as I drank a lot of water, the side effects decreased and were tolerable. I would recommend this to anyone who has a hard time sticking to a diet and exercise. This pill has worked great for me. Drink only water, get rid of sugar. Walk at least one mile a day."

• Che...
• Taken for less than 1 month
• October 24, 2014

Phentermine for Weight Loss (Obesity/Overweight) "I took this and it's the best thing I have ever tried. The first couple of days I went by the directions, then I doubled the dose. And I lost 20 pounds in 2 weeks. It did make me feel very jittery and my heart rate was going 90 to nothing, but I was determined to lose weight! And a little information, DO NOT, I repeat (DO NOT), take Fastin before you get in a tanning bed. Tan first, then take it. It made me very, very strange in a bad way. I'm no doctor but when I increased my dose, I had the shaking and the increased heart rate. But it never harmed me."

• Ms ...
• February 4, 2017

Phentermine for Weight Loss (Obesity/Overweight) "I started taking Adipex on Jan 1, 2014, until Feb 1, 2014. I lost 30 pounds even. I did only 30 minutes of cardio a day. That was just brisk walking. My side effects were: cotton mouth, extreme loss of appetite, I lost my ass, I had extreme energy, couldn't sleep, I was very focused, I had a pleasant attitude but quickly became irritated, fast heartbeat, and blurry vision every now and again. My doctor told me that with Adipex, it helps you curb your hunger, but when you work out, it burns double calories. I was 180 and went to 149. When I stopped, the weight never came back, and it became hard for me to eat as much as I used to. I got pregnant and had a baby on Jan 29, 2015. I am 180 pounds as of 2/4/17 and I started Adipex again. Same symptoms, and I'm losing a lot again."

• RZ1...
• April 19, 2013

Phentermine for Weight Loss (Obesity/Overweight) "I was prescribed phentermine/Adipex for weight loss after I discussed with my doctor my lack of energy being a full-time single working mother. Time and motivation were really my issues contributing to my weight. She said this would give me the motivation and 'want' to exercise and is an appetite suppressant. Those two things are very true. I work a desk job and cannot exercise until evening, so that is hard. On day 1 and 2, I was on the go all day and felt fantastic, full of energy, and very happy. On day 3, I had several negative side effects of high blood pressure, heart pounding, fatigue, insomnia. On day 4, I had the dose cut in half by my doctor. Today is Friday, day 5, and I have lost 9.5 pounds since Monday. Hoping to see more loss but slower!"

• Alm...
• October 21, 2016

Phentermine for Weight Loss (Obesity/Overweight) "I started Phen on 9/27/2016 weighing 201 lbs. Today is 10/21/2016, and I weigh 186. That is 15 pounds in less than a month. I eat right. I also get the Lipo B12 shot every Monday, and I go to the gym Monday through Friday on my lunch break. I work out and jog every evening. It has different effects on most people because we are all different. I take half of a pill in the AM and the other half at noon to reduce the fast heartbeat. If you don't work out, you're not teaching your body discipline. The first three weeks are the hardest, but it is easy now. I highly recommend this pill to anyone wanting to lose weight."

• CMa...
• Taken for 1 to 6 months
• June 24, 2019

For Weight Loss (Obesity/Overweight) "Started taking phentermine in February. My doctor prescribed it to me for 4 months. I am 30 years old and 5'3. When I started it, I was 162 lb ... 4 months later I am at 125 and feel better than I ever have!! Helped me stop craving sweets. Only side effect I had was a slightly higher heart rate and always thirsty."

• Mic...
• September 8, 2015

Phentermine for Weight Loss (Obesity/Overweight) "I tried Fastin for the first time today, which I purchased over the counter. Within 20 minutes, I experienced a slight euphoric feeling. After 30 minutes, however, my heart started racing, my body and hands began shaking, and I felt as though I was going to pass out when standing. I had to sit down until I felt in control. After 45-50 minutes, the shakiness and racing heart improved, as well as the dizziness when standing, but didn't disappear completely for over an hour. My mood still remained lifted. I may just be sensitive to the initial dosage, so I recommend that anyone sensitive to stimulant medications begin with a half dosage to minimize the initial negative effects until your body gets used to the drug."

• yel...
• January 22, 2014

Phentermine for Weight Loss (Obesity/Overweight) "I took a pill this morning with some tea, and while I was eating breakfast, I noticed my heart rate skyrocket. I don't know if this happened because I took Fastin on an empty stomach or what, but this is a little scary! It literally feels like my heart is going to jump out of my chest! At first, I didn't think I could be reacting to this drug so quickly, but apparently, it's a very quick-release type of pill. I can say that I'm not hungry and didn't finish my breakfast, but at what cost?! Maybe I should try taking a quarter of the tablet, but I think I'm a little too scared and will probably throw the bottle away. What a waste of $40! Oh well, better 40 bucks lost than a heart attack. Also, I bought these over the counter at a Rite Aid."

• Mat...
• Taken for 2 to 5 years
• October 9, 2019

Phentermine for Weight Loss (Obesity/Overweight) "I’ve been taking Fastin on and off for about 5 years. I always take half a pill in the morning and the second half in the afternoon. It definitely kills appetite cravings, and I have no desire for late-night snacking. Drink a lot of water. It can affect your mood. There have been days when I feel just so angry just by someone looking at me funny. It increases heart rate and gives a jittery feeling, but those side effects subside after a couple of weeks. It definitely works. I’ve lost 15 pounds in a month. Eat right and exercise and take this with precaution. I don’t recommend first-time users taking a whole pill. You will feel like you are having an anxiety attack."

• Bra...
• February 19, 2017

For Weight Loss (Obesity/Overweight) "Started phentermine in September 2016. My starting weight was 248. I'm 5 ft 7 in and 37 years old. I am 5 months into phentermine, and my current weight as of 2/18/17 is 199. I feel that most reviews on here are from people who have recently started, so I could share my experience and give a longer perspective. I will be brutally honest, as I'm not looking to sugarcoat anything. The first week taking phentermine is horrible. You feel lightheaded, dizzy, memory loss, sweating, heart pounding, shortness of breath, energy, and other symptoms. However, after about a week, these symptoms stop. Stay with it. This will change your life with the right attitude."

• Red...
• September 13, 2015

Phentermine for Weight Loss (Obesity/Overweight) "At a starting weight with a new doctor, 440 lbs. I tried Adipex. I only took it a week before I stopped due to headaches, heart racing just getting up to go to the bathroom. But with sheer willpower alone, in one year I lost 120 lbs. After losing an average of 10 lbs a month, my weight leveled out and I couldn't get but 5 lbs a month. So we decided to try Adipex again. I started on Aug 15 at 316, now, Sept. 13 - 295 lbs. This time, no side effects, I'm exercising more and feeling great. Hoping for the best."

• Dee...
• Taken for less than 1 month
• October 21, 2019

For Weight Loss (Obesity/Overweight) "I'm 5'6", age 24. My Dr. put me on phentermine 15 mg on Friday, 10/18/19. My starting weight was 232 lbs. It's now 10/21/19, and I weighed myself this morning at 221.8 lbs, so yes, I definitely think this is working. It makes me not think about food, but I do still get hungry, and when I eat, I get full really fast and can only eat very little. I also get a dry mouth, and my heart races, but that's all. I don't have any problem sleeping either. I take the pill every day around 11:30 a.m. I don't eat breakfast, and I wait at least 30 mins to eat after taking the medicine."

• Yer...
• Taken for less than 1 month
• December 4, 2019

For Weight Loss (Obesity/Overweight) "I was prescribed Phentermine. By day 9, I had lost 11 lbs and I was ecstatic. But that night, I ended up in the ER. My resting heart rate was 180, I was shaking, pale, and my lips were blue. They did blood work and EKG. Both came out fine. I was told to stop taking the medication and that things would get better, but they didn't. Everything I do elevates my HR. Even laying in bed, it goes up to 120 (norm is 60-100). Seven days later, I ended up in the ER again. I spent the day getting every test done: blood work, X-rays, EKGs, ultrasounds. Every test came out perfectly fine. They sent me home. But still, everything I do elevates my HR. I am exhausted, feel like I can't breathe. I am terrified to do anything because as soon as I do, my HR goes up. I need to see a cardiologist. Had I known this pill would cause all of this harm, I would have never taken it. I don't even feel like myself. I’ve been off of the medications for seven days with no improvements."