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Keflex and Gas: What Users Say

Gas: mentioned by 4 users (4.4%)

Based on user experiences from 91 Keflex 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.

nausea 14.3%
diarrhea 9.9%
headaches 8.8%
upset stomach 7.7%
dizziness 6.6%
tiredness 5.5%
depression 4.4%
fatigue 4.4%
gas 4.4%
itching 4.4%

Reviews for Keflex

Showing 4 reviews tagged with "gas". Clear filters to view all 91 reviews.
Commonly mentioned side effects
  • MMa...
  • Taken for less than 1 month
  • March 15, 2021

For Bladder Infection "Had a really bad UTI and was prescribed Keflex. I have a lot of anxiety when it comes to taking medications. I take Keflex with Zofran just as a precaution and also with food before I take it. No side effects besides some gas here and there. After taking the first dose, my UTI symptoms started to go away within the first five or so hours. Keflex is always my go-to when I have a UTI, it works so well!! Also, after taking a pill, I drink about 32 oz of water with it."

10 / 10
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  • owi...
  • Taken for less than 1 month
  • January 5, 2021

For Skin or Soft Tissue Infection "I was taking Bactrim for 2 days with no improvement before being prescribed Keflex QID for 7 days to take with Bactrim for an infected cut on my wrist from punching glass. As soon as I began Keflex, I started noticing improvement. It's hard to say whether the improvement or my side effects were from Keflex or Bactrim, so take this with a grain of salt. I had tachycardia, chills, nausea, indigestion, gas pain that felt like chest pain, itching on arms/legs, petechiae on my upper arms, frequent urination, and eventual yeast infection for which I had to take Diflucan. I had some symptoms together, and some separate. Most of my side effects came at night, though, so it could've been some kind of reaction between the two? The side effects definitely hit me harder in the beginning, but by my 5th day of Keflex, almost all side effects had subsided. I suggest taking with probiotics that can survive stomach acid and easily digestible food and drinking a lot of water."

6 / 10
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5 Report
  • RZM...
  • Taken for less than 1 month
  • January 17, 2015

For Bladder Infection "Prescribed by ER doc for bladder infection. It's giving me dry mouth, diarrhea, and bad gas but it's tolerable. Drink lots of water right after you take it."

8 / 10
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80 Report

Frequently asked questions

  • Anonymous
  • November 12, 2020

For Bacterial Infection "I had an infection on my nose. I was happy how Keflex cleared up, but the side effects were terrible... stomach cramps, gas. I was down for 3 days."

7 / 10
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8 Report

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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.