I got the Walgreens brand and had serious diahrrea from it that burned my skin up!!! Does mucinex dry up mucus. How fast does mucinex work. Posted 12/5/2010 8:52 PM (GMT -7) I don't use regular guaifenesin because it doesn't last long enough, but Mucinex 12-hour does work for me. Nyquil / Dayquil / Mucinex (or generic) “Some people will be clear within 4 days, some people may take a couple weeks,” he says. I take it most nights, and mornings when house is very dry. The study is created by eHealthMe from 18 Mucinex users and is updated continuously. It does work, but be careful if you buy the generic. Does mucinex dry out nasal passages. Does mucinex dry you out. The reason some people believe taking Mucinex helps with fertility is pretty straightforward. How they work The active ingredient in Robitussin and Mucinex DM products, dextromethorphan, is an antitussive, or cough suppressant. This is a reivew of how effective Mucinex (guaifenesin) is for Sinusitis and for what kind of people. Why that would be in the medication, don’t know. It alleges to improve symptoms such as low immunity, allergy symptoms, and frequent colds/flu. Mucinex is an FDA approved drug that fights chest congestion by targeting mucus build-up in your chest. Yet studies and many doctors claim Mucinex doesn’t work any better than placebo. The theory states that the active ingredient in Mucinex thins out a woman’s cervical mucus, allowing the sperm to travel faster and easier to the egg. Running one of the largest drug safety studies in the world, eHealthMe is able to enable everyone to run personal clinical trial. Mucinex is said to be an effective supplement that can help with boosting the immune system. Does mucinex help with cough. Looked up the ingredients and it also contains polyethylene glycol, the ingredient in Miralax. It loosens the mucus. Talk to a doctor now. It is not in the brand name. While rinsing my nose helps, I have had the most success taking Mucinex for post-nasal drip, my most bothersome symptom. It seems to break up the thick mucus and allow me to breathe, swallow, and sleep. Do you have any … Antibiotic for dry cough. Connect by text or video with a U.S. board-certified doctor now — wait time is less than 1 minute! Mucinex products have not been tested in and are not specifically indicated for the treatment or prevention of COVID-19, however, products in the Mucinex range may help to alleviate some of the milder symptoms.