Mucinex DM vs. Nyquil for Cough: Important Differences and Potential Risks.

Mucinex DM

(guaifenesin / dextromethorphan)

Nyquil Cold and Flu

Summary for Mucinex DM

Over-the-counter

Mucinex DM (guaifenesin / dextromethorphan) is an over-the-counter medication that's used to relieve cough and loosen mucus. It has two active ingredients: guaifenesin (an expectorant that clears chest congestion) and dextromethorphan (a cough suppressant that relieves cough). The medication is available as tablets, dissolvable granules, and liquid that are taken by mouth, each with different dosages, directions, and age limits. Extended-release tablets are taken every 12 hours, while the other forms are usually taken every 4 hours. Most people have few to no side effects when used as directed, but it can sometimes cause stomach upset, dizziness, and drowsiness.

Indications for Mucinex DM

Short-term relief of coughs caused by minor throat or lung irritation (e.g., common cold)
Loosens and breaks up mucus in the airways (chest congestion)

Pros and Cons for Mucinex DM

Pros

Available as a tablet, oral liquid, and dissolvable granules
Available over the counter without a prescription
Sugar-free options available, so okay to use for people with high blood sugar
Works within 30 minutes to help lessen cough

Cons

Not meant to be used long-term
Might need to take multiple times a day to relieve symptoms
Many states require you to be over 18 to buy it because of risk of misuse
Can't cut or crush extended-release tablets

Common Side Effects for Mucinex DM

Side effects aren't common. See Other Side Effects.

Warnings for Mucinex DM

Risk of overdose and misuse
Interactions with certain medications for Parkinson's disease and depression
Caution use in people with phenylketonuria (PKU) - dissolvable granules only

Summary for Nyquil

Over-the-counter

Nyquil Cold and Flu is a combination medication containing acetaminophen (a pain reliever), dextromethorphan (a cough suppressant), and doxylamine (an antihistamine). It's used to treat cold and flu symptoms, like sore throat, fever, cough, runny nose, sneezing, and aches, in adults and children. Nyquil Cold and Flu is available as pills and a liquid. This medication can make you feel sleepy and dizzy as side effects.

Indications for Nyquil

Temporarily relieves common cold and flu symptoms, including:

Cough
Sore throat
Headache
Minor aches and pains
Fever
Runny nose
Sneezing

Pros and Cons for Nyquil

Pros

Available over the counter
Works within 30 minutes to relieve cold and flu symptoms
Available in capsules and a liquid
Combines three medications in one product for convenience
Available as a lower-cost generic

Cons

Needs to be taken multiple times per day
Can cause extreme sleepiness
More difficult to customize the dose since it's a fixed combination of three medications
Need to avoid alcohol while taking it
Not meant for long-term use