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Mucinex and Diarrhea: What Users Say

Diarrhea: mentioned by 6 users (3.9%)

Based on user experiences from 155 Mucinex 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.

cough 6.5%
nausea 5.8%
drowsiness 5.2%
diarrhea 3.9%
dizziness 3.2%
vomiting 3.2%
headaches 2.6%
insomnia 2.6%
pain 2.6%
mucus 1.9%

Reviews for Mucinex

Showing 6 reviews tagged with "diarrhea". Clear filters to view all 155 reviews.
Commonly mentioned side effects
  • Anonymous
  • November 7, 2011

For Cough "About an hour and a half after taking one Mucinex DM, I developed severe dizziness, drowsiness, bad intestinal cramps, vomiting, and diarrhea that recurred over a period of 2 hours. It was the only medication in my system."

1 / 10
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54 Report
  • Con...
  • December 23, 2016

For Cough "The doctor gave me a sample of this when I complained of congestion. I took two tablets, which may have been too much since I developed the runs. I'll try it again, but only one tablet. Or, I may just get Robitussin since the doctor said that Mucinex is a magnified version of Robitussin."

5 / 10
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21 Report
  • Anonymous
  • Taken for less than 1 month
  • January 6, 2025

For Cough "I highly recommend drinking large amounts of water with this medication. I was not aware to do so because it was nowhere to be found on the label, and it resulted in vomiting and the runs. After hours of this and speaking with a nurse, I was able to get it under control. Will not ever take again."

3 / 10
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0 Report

Frequently asked questions

  • Anonymous
  • October 20, 2014

For Cough "I've been up for hours, throwing up and having diarrhea after taking this."

2 / 10
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61 Report
  • Jo7...
  • January 15, 2017

For Cough "Gave me diarrhea, dizziness, nausea, stomach cramps, and even some numbness in tongue/face. Worse than the cough. Never again."

1 / 10
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21 Report
  • Tin...
  • September 7, 2021

"I took Mucinex Cold & Flu, and it works, but it made me have diarrhea, severe stomach problems, and nausea."

1 / 10
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3 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.