Guaifenesin / pseudoephedrine and Dizziness: What Users Say

• Sin...
• Taken for less than 1 month
• April 14, 2013

For Cough and Nasal Congestion "I have suffered from allergic rhinitis all my life: dry, swollen sinus; sinus pressure; headaches; blurry vision; dizziness; lethargy; all sorts of cognitive problems because of the lack of oxygen to my body and brain due to thickened mucus in my respiratory system; not to mention frequent bacterial infections due to accumulated mucus secretions. I had tried every other medicine under the sun. Mucinex has taken all that away, and my quality of life has improved 150%. I strongly recommend Mucinex for those with sinus problems due to allergic rhinitis, or anyone who suffers from sinus or any sort of respiratory congestion."

• Nnn...
• November 12, 2015

For Cough and Nasal Congestion "It helped with the runny nose and cough, but I think the side effects made it not worth taking. The first hour was the immediate release, and it made me feel nervous, anxious, dizzy, nauseous, and I had awful tremors. After the first hour, I came down a bit and didn't feel as awful. Couldn't get any sleep on it, and being a mom of a one-year-old boy, I definitely need my sleep. I won't be taking it again. Going to go back to DayQuil, NyQuil, cough drops... Not for everyone."

• Anonymous
• April 10, 2012

For Cough and Nasal Congestion "I experience sinus problems frequently, mostly from allergies, probably. I have headaches and a stuffy nose, etc. This medication is wonderful. I should receive money for how many times I have recommended this to people. I feel like I can even think clearer when I take this. I rarely experience side effects. Maybe one time I had dizziness. Great product."

• Nat...
• February 19, 2018

For Cough and Nasal Congestion "No complaints, my husband left to go to the pharmacy at 2 am to pick up anything to bring me comfort. I've had flu-like symptoms since last Wednesday, got through the worst but now left conquering thick phlegm that I'd have to cough so hard to try to get out, my head felt swollen and my eyes would get burning hot, bringing on horrible throat and headache. Ok, so took this at 2:15 am, and within a half hour, I was asleep, and slept until I had to take my children to school at 8:30 am. This has made the mucus so much easier to get 'up and out', I do not have to hack so hard. For my experience, this has helped so much, I wish I had taken this a full day earlier. He also got me the day/night pack, I plan on taking the night pill at about 7 pm, being that I hope I can make it to work tomorrow and want plenty of sleep. I feel sleepy now even with my 2:15 am dose. I am normally very sensitive to medications but have not experienced high heart rate, dizziness, or nausea. I would buy again."

• u2a...
• November 6, 2011

For Cough and Nasal Congestion "My sister recommended this to me while I was experiencing several nasal congestion and cough. The product works GREAT WHEN USED AS DIRECTED. She suggested taking 2 (12 hour) pills instead of the one that was suggested on the box. (She had done this and thought I'd be okay.) I experienced VERY SEVERE side effects. I became extremely lightheaded, dizzy beyond belief, loss of concentration, and severe loss of appetite. I literally felt like I was walking on clouds. I suggest also not taking this at night as it will keep you up ALL night. One pill in the morning is enough to get you by."

• Anonymous
• February 25, 2011

For Cough and Nasal Congestion "When I took Mucinex D maximum strength for the first time, I did have great relief of congestion, but I also experienced a very scary rapid heartbeat, dizziness, and anxiety. The anxiety may be due to feeling like I had something really wrong going on, I'm not sure. I have taken many different OTC medications through the years and have never had an experience like this one."

• Pat...
• Taken for less than 1 month
• February 20, 2017

For Cough and Nasal Congestion "I went to Urgent Care Center today for a sinus infection. I got a prescription and was told to take Mucinex D. I took it a couple of hours ago, and I've been feeling weird ever since. It's ineffective so far, and I feel kind of dizzy. I want it out of my system NOW."

• Hel...
• Taken for less than 1 month
• October 27, 2016

For Cough and Nasal Congestion "I felt like I was going to die. I took the recommended doses for 12 and over, and I almost felt like I was going to die. I was so dizzy, throwing up for 2 hours. Never again will I take this medicine. Check these reviews."

• Jul...
• January 22, 2018

For Cough and Nasal Congestion "I took it at about 5 pm today when my cough was getting worse. It is now 5:30 am, and I haven't slept one bit. I am so jittery, nauseous, and dizzy. My heart is racing, and my whole body is shaking. My cough is significantly better, but the fact that I will not be getting sleep tonight for even a minute is quite the turn-off. I will never take this drug again."

• Moi...
• January 10, 2015

For Cough and Nasal Congestion "Helped somewhat with congestion, but I could not continue to take it due to insomnia (even after taking it during the day), jitters, dizziness, and anxiety."

• Anonymous
• March 28, 2008

For Cough and Nasal Congestion "I'm using this as a maintenance drug for sinus problems. It helps me breathe and dries up the mucus. So far, few and mild side effects: mild dizziness and upset stomach. Take with lots of food."

• Bla...
• January 30, 2016

For Cough and Nasal Congestion "Loosened phlegm, but makes you feel very dizzy, drowsy, and dehydrated."

• Mit...
• December 16, 2017

For Cough and Nasal Congestion "This medicine cleared my nose but also made me feel dizzy, gave me tremors, nausea, and made my heart pound. I felt awful after taking this and wouldn't recommend it to anyone."

• MON...
• March 30, 2016

For Cough and Nasal Congestion "This was heaven... I was very sick on my chest. Two doses and I feel way better and also kind of drugged and dizzy, but it is a relief. :)"