mucinex is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth. Mucinex is used to reduce chest congestion. Guaifenesin is an expectorant medication that thins mucus so it’s easier to clear out of your body. It won’t stop you from coughing, but it’ll make your. does mucinex dm make you sleepy? Drowsiness is a possible side effect of mucinex dm and other medications containing dextromethorphan. Don’t drive while taking this. Pseudoephedrine (gwye fen e sin; Soo doe e fed rin) is a decongestant, expectorant combination. It is used to provide.
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