Skip to main content

Alli and Upset Stomach: What Users Say

Upset stomach: mentioned by 4 users (3.3%)

Based on user experiences from 122 Alli 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.

diarrhea 6.6%
gas 5.7%
constipation 4.9%
bloating 3.3%
upset stomach 3.3%
cramps 2.5%

Reviews for Alli

Commonly mentioned side effects
  • hsi...
  • April 26, 2016

For Weight Loss (Obesity/Overweight) "I purchased Alli back in 2009 (great worked a treat and lost weight), and since I have had two more attempts in 2014, now 2016. The product does not work at all. This time I have been taking it for over one week, and I have experienced constipation and flatulence. The product was purchased from reputable pharmacies, and again I feel I just wasted my hard-earned money. I am unsure what has changed. However, I know one thing: the product is definitely not the same, I feel like the tablets are duds. No change to my weight, just embarrassing wind, stomach cramps, it makes you feel bunged up. No change to stool whatsoever, not even if fatty food is introduced to the diet. My advice is do not bother, I won't from now on. Hope this helps :("

1 / 10
Was this helpful?YesNo
73 Report
  • Sas...
  • Taken for less than 1 month
  • January 29, 2018

For Weight Loss (Obesity/Overweight) "Started Alli feeling unhealthy, no energy, not much bowel movement. 5'5", weighing 195 lbs. I know most of it's fat. I used to lift weights years ago in my younger days when I was fit. I had pregnancy diabetes. Dr. said if I didn't keep weight under control, I'd be a diabetic later in life. Once I had the baby, I no longer had to take insulin, but 20 years later, I'm overweight. I started Alli and went from 195 lbs to 190 lbs, lost 5 lbs in one week. My b.m.'s are more consistent, I feel more energy. I walk about a mile each day. I try to watch what I eat so that I don't get oily stools with stomach cramping (feels like menstrual cramps). Sometimes I splurge on a steak dinner when my husband takes me out to dinner. The rest of the week, it's one piece of lightly buttered toast with a cup of coffee, sugar/cream, and an apple for breakfast, a tuna sandwich with an apple for lunch, and air fryer chicken or fish filet for dinner. It's been only one week on Alli, I'm determined to lose 45 more lbs."

9 / 10
Was this helpful?YesNo
44 Report
  • Cec...
  • Taken for 1 to 2 years
  • October 6, 2024

For Weight Loss (Obesity/Overweight) "I recently tried Alli as a weight loss aid, and my experience has been quite a rollercoaster. While I did manage to lose 50 pounds, which was a significant achievement for me, the journey was far from smooth. Unfortunately, the drug caused severe stomach issues that ultimately led to me needing my gallbladder removed. The initial results were promising, and I felt motivated by the weight loss; however, the ongoing pain was overwhelming. I found myself purchasing pills every month from CVS, but since the store in Dillon, South Carolina has closed down, I've been left searching for alternatives. If you're considering Alli, I urge you to think carefully and consult with a healthcare professional. Weight loss can be a complex journey, and it's essential to prioritize your health above all else. If anyone has questions or would like to share their own experiences, feel free to reach out via text."

10 / 10
Was this helpful?YesNo
3 Report

Frequently asked questions

  • Mar...
  • Taken for less than 1 month
  • February 13, 2017

For Weight Loss (Obesity/Overweight) "I used Alli for about three weeks. I didn't notice it helping me lose weight faster than I can with a Weight Watchers program. It did increase my bowel movements. I did have some stomach discomfort and gas. I stopped using it at the end of the third week because I went out to dinner and took my pill with my meal, and it made me extremely ill. Vomiting and diarrhea for over eight hours!!! I would not recommend this product to anybody!!! Weight Watchers is working out very well for me. Eating healthy and exercise is the only way to go, there is no magic pill!!! I had to find out the hard way!"

1 / 10
Was this helpful?YesNo
27 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.