Taking Mucinex DM With Tylenol Cold And Head Congestion

In our latest question and answer, the pharmacist discusses whether or not there is an interaction between Mucinex DM and Tylenol Cold And Head Congestion

2 min read Updated Jun 2026 Read by 10,503 people
Taking Mucinex DM With Tylenol Cold And Head Congestion
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Ashley asked

Can I take Mucinex DM, Benadryl, and 'Tylenol Cold and Head Congestion' together?

Nov 17, 2022
The quick answer
  • Both Mucinex DM and Tylenol Cold and Head Congestion contain guaifenesin, so taking them together would be a duplicate dose that could increase side effects.
  • Always read the labels of over-the-counter cold and flu medications since they often share brand names but contain different active ingredients.
A quick summary of Dr. Brian Staiger, PharmD's full answer below, condensed by AI from that answer only (not from any outside source). The pharmacist's answer is the source of record.

Answer

Mucinex DM should not be taken at the same time as 'Tylenol Cold And Head Congestion' as they both contain guaifenesin. Taking both medications together is a therapeutic duplication and could potentially increase the risk of side effects.

It is important to always read the labels of the drugs you are looking to take, especially over-the-counter cold/flu medications, as they often contain similar ingredients.

Tylenol Cold And Head Congestion Ingredients

'Tylenol Cold And Head Congestion' contains the following active ingredients:

  • Acetaminophen
  • Phenylephrine
  • Guaifenesin

Acetaminophen is a pain reliever and the active ingredient in Tylenol.

Phenylephrine is a nasal decongestant and active ingredient in Sudafed PE.

Guaifenesin is an expectorant and the active ingredient in Mucinex. 

***Please note that since the first publication of this answer, Tylenol has changed the name of this product to 'Tylenol Sinus Severe'.***

Mucinex DM Ingredients

Mucinex DM contains the following active ingredients:

  • Dextromethorphan
  • Guaifenesin

Dextromethorphan is a cough suppressant.

As you can see, Mucinex DM and 'Tylenol Cold and Head Congestion' both contain guaifenesin.

Taking Mucinex DM With Tylenol Cold And Head Congestion

Since both of these medications contain guaifenesin, they should not be used together. It is important to always look at the labels of over-the-counter medications as they often contain more than one active ingredient.

If you are looking for cough relief, dextromethorphan is available as a single ingredient in products such as Delsym.

Final Words

You mentioned Benadryl in your question too. That is safe to take with all the drugs in question here (Mucinex DM and 'Tylenol Cold and Head Congestion').

I appreciate you reaching out to us!

If I could leave you with a final thought, it is that you should always read the labels of the drugs you are taking. This is especially true with over-the-counter medications.

Many products share a brand name (e.g., Tylenol, Mucinex, DayQuil, etc...) but can contain several different ingredients.

You want to be sure not to take two products that contain the same drug.

References & sources
  1. Diphenhydramine Monograph — PubChem
  2. Acetaminophen Monograph — PubChem
  3. Dextromethorphan Monograph — PubChem
  4. Guaifenesin Monograph — PubChem
  5. Tylenol Sinus Headache — Tylenol
Glossary — Terms in This Answer
Guaifenesin
An expectorant medication that helps thin mucus and make coughs more productive.
Therapeutic duplication
Taking two or more medications that contain the same active ingredient, which can lead to overdose or increased side effects.
Acetaminophen
A pain reliever and fever reducer commonly used in over-the-counter medications.
Phenylephrine
A nasal decongestant that reduces nasal congestion by narrowing blood vessels in the nasal passages.
Dextromethorphan
A cough suppressant that reduces the urge to cough by acting on the brain's cough center.
Expectorant
A medication that helps thin and loosen mucus to make it easier to cough up.
Decongestant
A medication that relieves nasal congestion by reducing swelling in the nasal passages.
Active ingredient
The substance in a medication that produces the therapeutic effect or treats the medical condition.
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Dr. Brian Staiger, PharmD
About the pharmacist

Dr. Brian Staiger, PharmD

Clinical Pharmacy

Doctor of Pharmacy, board certified clinical pharmacist (BCPS), American Herbalist Guild, Medication Therapy Management certified

Brian Staiger, PharmD, BCPS, is a licensed pharmacist with more than 13 years of experience across retail pharmacy, clinical pharmacy, medication safety, pharmacy program development, and healthcare administration. He is the founder of HelloPharmacist.com, where he helps patients...

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