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Mucinex and Insomnia: What Users Say

Insomnia: mentioned by 4 users (2.6%)

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 4 reviews tagged with "insomnia". Clear filters to view all 155 reviews.
Commonly mentioned side effects
  • Sar...
  • Taken for less than 1 month
  • March 4, 2014

For Bronchitis "I took Mucinex for a bad case of bronchitis. It worked very well and I was finally able to stop coughing and start breathing again. The only problem was that it interfered with my sleep. I was awake most of the night and was not tired the next day. I had to quit taking it."

6 / 10
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  • Cap...
  • May 15, 2016

For Cough "I was suffering from a severe virus-caused sore throat with terrible coughing. My PCP advised me to take Mucinex but at substantially greater dosage than the package recommends. I did so for about 3-4 weeks. The medication did help relieve my coughing, but it interfered so badly with my sleep that I had to discontinue taking it. I notice that other people have experienced sleep problems with Mucinex. There should be a warning about this on the package label."

6 / 10
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  • tom...
  • Taken for less than 1 month
  • September 23, 2021

"I took this for muscle pain and soreness, which is a common off-label use recommended by my doctor. While it was pretty effective for relaxing muscles, it caused very bad sleeplessness, even when taking an Ambien. I had to stop use, as insomnia made the muscle pain worse! Catch-22..."

3 / 10
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4 Report

Frequently asked questions

  • Bob...
  • September 21, 2011

For Cough "Very effective for the sinus congestion and sinus drip. However, continuous use resulted in leg cramps at night. Interfered with sleep. Research says that it can reduce blood flow to legs."

4 / 10
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41 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.