Average Rating: 1.9 (125 Ratings)

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 Type: Over-the-counter Drug

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Key to Ratings: 1=LOW (I would not recommend taking this medicine.)
5=HIGH (this medicine cured me or helped me a great deal.)

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  Charts & graphs: Drug Safety Information

 1  Congestion Took it before bed with food and plenty of fluids will not stop throwing up or having diarrhea. My congestion is gone but at what cost. F 22 1 days
1X D
 1  Chest congestion Drug from hell next day horrible panic attack, felt like Being shocked by electricity, images in my mind going fast forward Making no sense, felt like I was Dying had to leave work and walked around the factory outside 3 times freaking out! I have and Anxiety disorder already but this was horrible horrible Had to take clonazapam to calm me down M 51 1 days
2 pills 1X D
 1  To alleviate mucus in throat and no I Only took one pill, one time and it left me up all night with an Uncontrollable cough and a burning throat from coughing all night. Mucinex did not help my symptoms, it worsened them. Do not recommend anyone to buy or take this product. (1200 mg Mucinex Maximum Strength) Company needs to take product off the market and remove from shelves. "Discontinue Product." F 45 0 days
1200 1X D
 1  Covid Honestly I don't know where to begin. This drug SUCKS. I've taken it once before and it was okay didn't really feel like it did much. But this time I've taken it, it's horrid. About 5-10 minutes after taking it I felt weird. Feeling not myself and just freaking weird. Within the next hour feeling very dizzy, drowsy, having severe anxiety, paranoia, panic, hard time breathing, and just foggy. Like I'm literally scared to fall asleep bc this medicine has me so messed up. I thought it was just me but reading all these reviews I feel some relief. TAKE THIS STUFF OFF THE SHELF. Zero stars, -100 points, 0/10 DO NOT recommend I took mucinex DM max. F 20 1 days
20mg 1X D
 1  Horrible sinus pressure Horrible chills, stomach pain/burning, in the bathroom constantly. My sinus headaches were as painful as migranes but now my stomach pain is way worse! I feel like I took musinex and it sent me into a full on FLU. I just hope it goes away before tomorrow. This is absolutely miserable. What a mistake..😔 I would NOT recommend!!! Find alternatives!! F 32 1 days
1x 1X D
 1  Dry cough I took 1 pill before bed because it says cough suppressant that aids sleep. I slept poorly for a couple hours and woke up suddenly with a very rapid heart beat. I felt like I was overdosed on heavy drugs and disconnected from my body. My tongue felt dry and thick. I was dizzy and had chills. I went to the ER and was told the DM version is like taking meth. Terrible product!!!! It should be illegal! F 34 1 days
1X D
 5  Cold I am always left in a fog the following day I have been taking this stuff for a long time, it always works amazingly but does leave me in a bit of a fog the following day. 10/10 would recommend for anyone that "can't find something that works " M 32 1 days
DM Max 1X D
 1  SINUS AND COUGH SEVERE ANXIETY, SEVERE PANIC ATTACKS, OUTER BODY EXPERIENCE. My fianc had the same exact experience. This drug should be taken off the shelf ASAP M 44 1 days
 1  Chest cough Extreme panic and anxiety. Just drink fluids instead! F 26 4 days
2X D
 1  Nasal congested Found out I had sinusitis , and had terrible pain and congested in the sinus area. So I took it around 8:30pm before going to sleep, I sat there for a while and slowly went to sleep I woke up at 3am with shooting burning pain in my abdominal area. I've felt this pain before when I had an ulcer in my stomach, but an hour later I used the restroom and the feeling s went away. I still feel like my stomach is rumbling and I will never take it again. I'm up almost 4 am and I'm shaking right now. I haven't had anxiety this bad in a long time. Would definitely never take it eve again. I wouldn't recommend for those who deal with anxiety that is all. Don't buy this product if you have stomach issues or deal with anxiety!!! F 25 1 days
20MG 1X D
 1  Post-nasal drip I took the Mucinex DM right before I went to bed, like 10ish. Well 30 minutes later my anxiety was really bad. It felt like I was dying or having a heart attack. I also was shaking really bad, like if I was standing outside in the snow. My heart was pounding out of my chest. Felt very confused. Had a hard time breathing for an hour or two. Got hot/cold flashes. Stomach was upset throughout the night. I did not want to go to sleep because I thought I was going to wake up and all this stuff will happen again. So I just stayed up until I could go to the doctor and tell them what happened.Felt groggy and awful the next day. I almost went to the ER because the side effect where scary and horrible. I'm never taking this medicine or any medicine like this ever again!! I do not want other people to suffer like I did! It is not worth it! Do not recommend to anybody! Awful side effects! They should at least put a warning or caution label on the box to let people know that this is what happens when you take this medicine! F 24 1 days
 1  Sinus congestion Insomnia, brutal stomach pain, indigestion, constipation I took this in the past and it never really hurt this bad. There was the occasional stomach pain, but eating food helped. Now, this is a different story. 2 days later, my stomach still hurts and I haven't touched the stuff. My stomach is killing me and has rolling waves that seem to be coming from my liver. I feel blocked up, my stomach feels sore and heavy, and I want to cry. Inside I am. I'm miserable. It helped with my mucus, but this is not worth it. This is some kind of living hell. Everyday the pain lessens, but if I'm hungry at all, my stomach now burns with the force of 1000 suns. Stay away!!!!!!!!!! F 31 1 days
1X D
 1  Cough, chest congestion This is a hell drug! I've taken it at night the last few nights to help keep me from coughing in my sleep and waking up so I can get better faster. The first night was fine I think, no adverse side effects, and it helped with my cough and I slept great. I had diarrhea in the morning but I didn't think much of it. The second night I had a wild and violent nightmare unlike anything I'd ever experienced. I shot up at 5AM without a morning alarm in a state of anxiety and panic, I thought just from the completely insane nightmare that I had, so I didn't think it would have been related to Mucinex. My stomach hurt a little bit, but I didn't think it was Mucinex. I again had diarrhea in the morning, I assumed it was just part of my sickness. The third night I took it, I once again had a completely insane and out of control nightmare, insanely violent, vivid, gory, more unsettling than the previous night, and horrifying unlike anything I've ever experienced before. I shot up at 5AM once again in a state of anxiety and panic, my stomach was KILLING me, and I think I had hallucinations in the dark. It was a completely insane experience. This drug is hell on earth horrible and I have never experienced anything like this in my life! Avoid this garbage like the plague, just deal with the cough instead! This is the 12hr slow release tablet, Mucinex DM AVOID LIKE THE PLAGUE M 27 3 days
1200mg 1X D
 1  Mucus in lung Dizzy, diarrhea, vomiting, anxiety, panic attacks, feeling confused, scared to sleep, feeling like i'm dying. please please never ever take this drug! it is hell in a bottle and will make you feel like you are going insane. F 21 2 days
1 1X D
 5  Chest congestion/ Allergies The only side effects that I am experiencing is smelly urine and gas. This stuff is great for if I'm having really stubborn mucus. Usually just treat with the children's grape flavored liquid Mucinex and that stuff works well. Thank you Mucinex for existing! F 33 1 days
600 mg 1X D
 1  Cough Heart racing, sore stomach and extreme panic attacks. Around 20 minutes after taking this I felt an overwhelming sense of “doom” like something bad was going to happen, pacing the room, feeling like I couldn't breath. I had chest pain and my heart was racing and also had bathroom urgency, this lasted 11 hours and resulted in a trip to the ER as I was sure I was having a severe allergic reaction. Turns out it was the nasty side effects. F 26 1 days
200mg 2X D
 1  Cold HORRIBLE DEATH DRUG!!! Heart racing, terrible anxiety, awful dizziness, crazy headache pain, eyes hurt, cannot sleep, ongoing panic attacks, all this after only one pill. Im writing this about 18 hours after I took just one pill and side effects are continuous and ongoing. Im just waiting for it to exit my system forever. I cannot function!! Stay away! Btw, I dont think these side effects have anything to do with age or gender. F 55 1 days
1 1X D
 1  Sinus Problems Do not take this medication! It won't help you! I was having severe side effects: dizzyness, lightheaded, nausea, hot flashes, panic attacks, and anxiety. It also made me feel jittery! I had to go to urgent care and all they said was to let it run it's course! It's horrible. My brain felt like it was shaking. Don't take this. If you have mucus problems I recommend NeilMed rinse! Do NOT take F 19 2 days
1200 mg 1X D
 1  bronchitis i took the pill around 6 or 7pm to begin with, because i was wanting to help my bronchitis after an hour or so i start to fall sleep but waking up with anxiety that end up in a several panic attacks getting worst with the time i thought i was ending up in the hospital with a heart attack! i don't think is the safe thing to do, i have never ever experienced such thing like i did F 42 2 days
30 mg 1X D
 1  Nasal congestion and cough I've taken this in the past with no issues but this time I experienced nausea, diarrhea, heart palpitations, tachycardia, anxiety, tingling in arms and legs, dizziness, nervousness and agitation. Will never take again. Do not recommend. F 40 4 days
2X D