NyQuil With Prednisone - Interaction Details

In our latest question and answer, the pharmacist discusses whether or not there is an interaction between NyQuil and prednisone.

2 min read Updated Jun 2026 Read by 18,671 people
NyQuil With Prednisone - Interaction Details
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Sanj asked

I have a sinus infection, so my doctor gave me prednisone and a Zpak. I also want to take NyQuil. I know that is safe with the Zpak but I don't know about NyQuil.

Oct 19, 2022
The quick answer
  • There is no known interaction between prednisone and NyQuil or NyQuil Severe, so they are safe to take together.
  • NyQuil may actually help with some prednisone side effects like insomnia and jitteriness by promoting sleep.
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

There is no known interaction between prednisone and any of the drugs contained in NyQuil or NyQuil Severe. They are considered safe to take together.

More Detail

There are a variety of NyQuil formulations on the market, with the two most popular being NyQuil and NyQuil Severe.

NyQuil contains the following ingredients:

  • Acetaminophen
  • Dextromethorphan
  • Doxylamine

NyQuil Severe contains the following ingredients:

  • Acetaminophen
  • Dextromethorphan
  • Doxylamine
  • Phenylephrine

So, when considering interactions between prednisone and NyQuil, we have to take into account all of the drugs contained in NyQuil products.

Fortunately, prednisone is safe to take with all of the above drugs.

In fact, NyQuil may help alleviate some of the side effects many individuals experience from prednisone, namely, insomnia and jitteriness. NyQuil can be a good option to help you get some sleep at night.

About NyQuil

NyQuil is a combination ingredient cold/flu medication. As mentioned, it comes in a variety of forms, and can contain the following drugs:

  • Acetaminophen: A pain reliever and fever reducer. Acetaminophen is the active ingredient in Tylenol.
  • Doxylamine: A sedating antihistamine, similar to Benadryl (diphenhydramine).
  • Dextromethorphan: A cough suppressant. 
  • Phenylephrine: A nasal decongestant.

NyQuil begins working about 15 to 30 minutes after taking a dose and has a typical duration of action of around 4-6 hours.

About Prednisone

Prednisone is used alone or with other medications to treat the symptoms of low corticosteroid levels (lack of certain substances that are usually produced by the body and are needed for normal body functioning).

Prednisone is also used to treat other conditions in patients with normal corticosteroid levels. These conditions include:

  • Arthritis
  • Severe allergic reactions
  • Multiple sclerosis
  • Lupus
  • Various conditions that affect the lungs, skin, eyes, kidneys, blood, thyroid, stomach, and intestines.

Prednisone is in a class of medications called corticosteroids and works in those with low levels of corticosteroids by replacing steroids that are normally produced naturally by the body. It works to treat other conditions by reducing swelling and redness and by changing the way the immune system works.

Final Words

I hope you found this answer helpful and please reach back out in the future if anything else comes up!

References & sources
  1. Acetaminophen Monograph — PubChem
  2. Dextromethorphan Monograph — PubChem
  3. Phenylephrine Monograph — PubChem
  4. Doxylamine Monograph — PubChem
  5. Prednisone Monograph — PubChem
Glossary — Terms in This Answer
Prednisone
A corticosteroid medication that replaces or supplements steroids naturally made by the body and reduces inflammation and immune system activity.
Acetaminophen
A pain reliever and fever reducer commonly found in over-the-counter medications like Tylenol.
Dextromethorphan
A cough suppressant ingredient found in many cold and flu medications.
Doxylamine
A sedating antihistamine that causes drowsiness and is used to help with sleep in cold medications.
Phenylephrine
A nasal decongestant that helps reduce nasal congestion and swelling.
Corticosteroids
A class of medications that reduce inflammation and suppress immune system activity.
Antihistamine
A medication that blocks histamine to reduce allergic reactions and can cause drowsiness.
Duration of action
The length of time a medication continues to work in your body after you take it.
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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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