Taking Benadryl With Mucinex
In our latest question and answer, the pharmacist discusses the safety of taking Benadryl and Mucinex together.
Can you take Benadryl (diphenhydramine) and Mucinex (guaifenesin) together?
Apr 27, 2022- Benadryl and Mucinex are safe to take together and many over-the-counter cold products contain both ingredients combined.
- Benadryl is a sedating antihistamine that works within 15 to 30 minutes and lasts around 4 to 6 hours, while Mucinex is an expectorant that helps loosen mucus to make coughs more productive.
Yes, Benadryl (diphenhydramine) and Mucinex (guaifenesin) may be safely taken together as there is no drug interaction between the two.
In fact, many over-the-counter products contain both of these ingredients to aid in alleviating various cough and cold symptoms.
What Is Benadryl?
Benadryl (diphenhydramine) is a sedating, first-generation antihistamine and will begin working within 15 to 30 minutes after taking a dose.
Each dose lasts around 4-6 hours, with this time being extended in certain individuals (e.g. the elderly). This is why a 'hangover' effect is more common in older adults.
Benadryl has many uses. Most commonly, it is used for the treatment of allergies and as a sleep aid (due to its sedative effects).
When used for allergies, it not only acts to prevent allergy symptoms (by blocking the binding of histamine to receptors) but also has a drying effect. The drying effect of Benadryl is one of the many 'anticholinergic' properties of the drug. These effects help to clear up a runny nose as well as help reduce postnasal drip.
What Is Mucinex?
Mucinex (guaifenesin) acts as an expectorant. It helps to loosen and thin mucus secretions, making it easier to remove them from the airways.
When you have chest congestion, Mucinex often changes an unproductive cough to a productive one. This can help to soothe an irritated throat.
Mucinex has very few documented drug interactions and is thought to be safe with most prescription and OTC products. In fact, many drug information sources report that Mucinex has no known drug interactions.
Final Words
As mentioned, both Mucinex and Benadryl can be taken together and often are. They are very common ingredients in many over-the-counter cough/cold products.
References & sources
- Elsevier ClinicalKey: Interactions. — ClinicalKey (Subscription Required)
- Long term use of diphenhydramine — PubMed
- Comparative anticholinergic activities of 10 histamine H1 receptor antagonists in two functional models — PubMed
- The Role of Guaifenesin in the Management of Chronic Mucus Hypersecretion Associated with Stable Chronic Bronchitis: A Comprehensive Review — PubMed
Glossary — Terms in This Answer
- Diphenhydramine
- The active chemical ingredient in Benadryl that blocks allergic reactions and causes drowsiness.
- Guaifenesin
- The active chemical ingredient in Mucinex that helps thin mucus to make coughs more productive.
- Antihistamine
- A medication that blocks histamine, a substance in the body that causes allergy symptoms like itching and congestion.
- Histamine
- A chemical in the body that your immune system releases during allergies, causing symptoms like itching and swelling.
- Anticholinergic
- A type of drug effect that dries up secretions in the body, such as mucus and saliva.
- Expectorant
- A medication that loosens and thins mucus to make it easier to cough up.
- Postnasal drip
- The sensation of mucus dripping down the back of your throat, typically caused by congestion or allergies.
- Drug interaction
- When two medications affect each other in ways that change how they work or increase side effects.
Dr. Brian Staiger, PharmD
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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