Mucinex Fast-Max Severe Congestion & Cough and Nausea: What Users Say

• Lyn...
• Taken for less than 1 month
• December 18, 2019

For Cough and Nasal Congestion "Mucinex severe cough and congestion seems to be working great! I haven’t had any problems as others have said, and I would be the one to have nausea and bowel issues! I’m very pleased with the results!"

• Nic...
• Taken for less than 1 month
• October 6, 2016

For Cough and Nasal Congestion "Took it an hour ago. Now I'm drowsy but also heart racing and shaky and nauseous ... so 3 more hours of this, and I have to get my kids off the bus. Never again will I take this. Did wonders for my cold, but these side effects aren't even worth it...."

• Kat...
• Taken for less than 1 month
• November 23, 2021

For Cough and Nasal Congestion "I've been taking this medication for a few days. It did burn pretty badly and made my stomach a bit crampy, but it worked well for my cough and congestion, so I continued on with it despite that. Today I took a dose after not taking any yesterday and immediately my esophagus began burning, then my chest and almost immediate cramping. In succession, my chest started to hurt and I got very hot and nauseous. Tried to take a nap and was awoken with vomiting for a few hours. It's now been 5 hours since the dose. The vomiting has stopped, but my stomach is still burning. I would never, ever recommend this product for anyone!"

• Ty2...
• February 1, 2018

For Cough and Nasal Congestion "I took the syrup version because I had been coughing up mucus in my lungs for about a week. Previously, I took Vicks NyQuil, but after using 24 oz, I thought that was a safer alternative. After 3 hours of taking a 15 mL dosage (the dosage cup was broken - had to use the NyQuil measuring cup, which says 15 mL and 30 mL), which is 5 mL less than the recommended dosage, I was getting a fever, had trouble urinating, vomited, and had diarrhea at the same time. I did the same thing last night, but I ended up just not getting any sleep from being nauseous. I wish I had read the warning on the product that said, 'do not take if your cough is phlegmy,' but you know how it is with medication, the retailers keep it so well packaged that you have to take it home and read the warnings after popping down $20 to purchase it. I am going back to NyQuil for $10 in the future, but will let this cough subside first."

• Ann...
• November 29, 2019

For Cough and Nasal Congestion "Worst product ever. Awful diarrhea, and I mean awful, hours lasting and painful. Instantly nauseous! Do not waste your money."