Skip to main content

Fastin and Nausea: What Users Say

Nausea: mentioned by 10 users (12.3%)

Based on user experiences from 81 Fastin reviews, the following table shows the most commonly mentioned side effects.

All user comments are moderated by Drugs.com. Each review is verified for relevance and screened for inappropriate content. Side effects are user-reported and not clinically verified.

increased heart rate 32.1%
anxiety 19.8%
nausea 12.3%
tremors 12.3%
headaches 3.7%

Reviews for Fastin

Showing 10 reviews tagged with "nausea". Clear filters to view all 81 reviews.
Commonly mentioned side effects
  • hap...
  • Taken for 1 to 6 months
  • May 13, 2015

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."

8 / 10
Was this helpful?YesNo
185 Report
  • Bec...
  • Taken for less than 1 month
  • August 1, 2019

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!"

9 / 10
Was this helpful?YesNo
27 Report
  • Cry...
  • June 22, 2019

For Weight Loss (Obesity/Overweight) "Got these pills and took a pill after breakfast, and my heart felt like it was going to pop out of my chest. Increased heart rate, blood pressure. Also gave me a terrible headache and nausea. Felt like I was going to die. Had to go to the hospital, and the doctor told me I was getting an anxiety attack as well. Would not recommend it. Terrible experience."

1 / 10
Was this helpful?YesNo
23 Report

Frequently asked questions

  • Dan...
  • March 21, 2021

For Weight Loss (Obesity/Overweight) "It works well at giving you energy, but it gives the jitters sometimes. It definitely curbs the appetite, but can also make you a little queasy. I lost weight with it, but stopped taking it after about 6 months."

8 / 10
Was this helpful?YesNo
9 Report
  • Anonymous
  • July 12, 2016

For Weight Loss (Obesity/Overweight) "Made me super sick. This was my first time trying it, I took the prescribed dose, and I've been trembling out of my skin for the last hour. My blood pressure is through the roof, and my heart rate is 141 bpm right now. I'm also nauseous and would be at the emergency room right now if not so terrified I'd crash my car if I tried to drive."

1 / 10
Was this helpful?YesNo
23 Report

Are you taking this medicine?

Your review helps others make informed decisions.
Write a review
  • So ...
  • Taken for less than 1 month
  • May 10, 2019

For Weight Loss (Obesity/Overweight) "Do NOT use this product. It has a strong caffeine-like effect. I took it and had the worst possible headache and felt so nauseated. Yeah, no wonder you’ll lose weight, you’ll feel so sick you won’t want to put anything in your mouth. Gosh, I feel so lightheaded after taking this. Definitely do not recommend."

1 / 10
Was this helpful?YesNo
19 Report
  • Bec...
  • April 5, 2016

For Weight Loss (Obesity/Overweight) "This pill is the devil! Don't do it! I have seriously considered contacting the FDA to have it removed from the shelves! Made me feel completely out of control of my body and sick to my stomach to the point I had to lay down and hope I wasn't having a heart attack! Don't buy this crap!"

1 / 10
Was this helpful?YesNo
31 Report
  • mam...
  • Taken for less than 1 month
  • June 28, 2014

For Weight Loss (Obesity/Overweight) "I took Fastin this morning, and within 30 minutes, my heart was pounding so hard I thought I was going to throw up. I don't like the way it made me feel."

2 / 10
Was this helpful?YesNo
89 Report
  • Cnt...
  • Taken for less than 1 month
  • March 15, 2017

For Weight Loss (Obesity/Overweight) "This doubles my heart rate, feel extremely nauseated, and like I'm about to die."

1 / 10
Was this helpful?YesNo
18 Report
  • Sin...
  • May 1, 2019

For Weight Loss (Obesity/Overweight) "I took the Fastin pill before reading reviews. Heart is racing, I’m jittery and feel like throwing up. I’ll try again tomorrow with half a dose."

1 / 10
Was this helpful?YesNo
12 Report

Are you taking this medicine?

Your review helps others make informed decisions.
Write a review
Reviews may be edited to correct grammar/spelling or remove inappropriate content. Reviews appearing to come from parties with a vested interest are not published. This information is not intended to endorse any medication and should not replace the expertise and judgment of healthcare professionals.