All about DayQuil

In general, DayQuil is an effective cough suppressant. The common cold or flu causes cough. This all-in-one product can treat such coughs, fevers, etc. effectively. However, it cannot cure cough caused by asthma, smoking, or emphysema.

In this article, we have detailed DayQuil, its ingredients, the way it works, and precautions.

DayQuil is manufactured for day use. So, it does not contain doxylamine (antihistamine) like NyQuil. Therefore, you will not feel drowsy after taking this drug.

Moreover, this drug does not contain stimulants like caffeine. Hence, you can take this drug as prescribed by the doctors safely.

What are the Ingredients of DayQuil

In fact, DayQuil is a combination of dextromethorphan, acetaminophen, and phenylephrine. It temporarily treats certain symptoms of cold and flu. Some of these symptoms are cough, fever, sore throat, headache, nasal congestion, and also a few minor aches.

Acetaminophen is a pain mitigator and also a fever reducer. It works by altering the ways how your body senses pain. It also changes the method your body regulates temperature. Dextromethorphan effectively suppresses the coughing sensation.

Typically, Phenylephrine is used as a nasal decongestant. It reduces the swellings in blood vessels that pass through the nasals. It can also relieve pressure and sinus congestion.

DayQuil is available in capsule form (LiquiCaps) and also in liquid form (Syrup). Like any medication, consult a medical expert for the correct dosage before using this product. Particularly, avoid giving this medicine to children (under 4years) unless directed by pediatricians.

Side Effects of Using DayQuil

In general, DayQuil is a safe drug when you use it as directed by the experts. However, it has some side effects like drowsiness, vomiting, nausea, stomach pain, dizziness, nervousness, and trouble while sleeping.

Most of these troubles fade away as your body starts adjusting to the drug. However, if you feel bothersome, consult a physician.

While you take this medicine, avoid consuming grape juice. It may increase dextromethorphan levels that can stimulate dizziness or nervousness.

Allergic reaction is a serious side effect pertaining to DayQuil. Its symptoms include itchiness, rashes, hives, difficulty in breathing, blistering skin, and trouble while swallowing.

In rare cases, some patients may also suffer swelling of the throat, face, tongue, lips, legs, hands, feet, or ankles.

After consuming this drug, if you find abnormalities, contact medical experts as early as possible.


If you take medications consisting of acetaminophen, avoid DayQuil. Rarely though, taking excessive amounts of this aromatic compound may damage the liver. The acetaminophen used in DayQuil is known to interact with the below-mentioned drugs:

1.) Isoniazid
2.) Carbamazepine
3.) Phenothiazines
4.) Warfarin
5.) Phenobarbital
6.) Phenytoin

Similarly, dextromethorphan and phenylephrine in DayQuil can interact with MAOIs (Monoamine Oxidase Inhibitors). So, do not use this drug with MAOIs. Be aware, even if you have used MAOIs anytime during the last two weeks, interactions can still occur. Some of the MAOIs include:

1.) Selegiline
2.) Isocarboxazid
3.) Tranylcypromine
4.) Phenelzine

Monoamine oxidase inhibitors (MAOIs) are used to treat anxiety, depression, and also other mood disorders.

Also, if you drink in excess of 3 alcoholic beverages every day, avoid this drug. This fatal combination can harm the liver lobes.

DayQuil and Sleep Aids

Melatonin is a hormone that regulates the sleep-wake cycle. It can also be taken as a supplement to treat short-term sleep problems. Melatonin does not react with DayQuil. Hence, you can use both drugs at the same time.

Naturally, valerian roots are not known to interact with DayQuil. Hence, you can use valerian Root supplements as sleep aids with it.

Other natural sleep aids that do not have reported interactions with DayQuil include the following:

1.) L-Theanine
2.) Glycine
3.) Lavender
4.) Passionflower
5.) Ginkgo Biloba
6.) Magnesium
7.) Tryptophan

We personally prefer to use OLLY Restful Sleep Gummies as sleeping aids. In our tests, this supplement did not interact with DayQuil. Instead, they both worked together! In any case, we recommend you take expert advice before using any medication.


This drug can worsen several medical conditions including thyroid disease, diabetes, high blood pressure, heart disease, and liver disease. It can also make urination further harder if you are already suffering from an enlarged prostate.


As stated before, DayQuil contains acetaminophen. So, if you take this drug with other medications having acetaminophen, it may cause an overdose. Even if you use this drug alone, consuming more than the prescribed quantity may cause an overdose.

Typically, overdosage of acetaminophen damages the liver lobes. This can be fatal and may need immediate medical attention. Hence, call your local poison control faculty, if you have accidentally consumed DayQuil excessively.


Dextromethorphan is one of the commonly misused synthetic compounds. When consumed excessively, it can cause high feelings or even hallucinations. In fact, continuous misuse of this compound leads to death.

As we know, DayQuil consists of dextromethorphan. Hence, use this drug in prescribed quantities only. Otherwise, you can ask for alternative medications to cure the symptoms of the common cold and flu. Medical experts can help you in this regard.

Pregnant or Breast-Feeding Women

If you are a pregnant or breastfeeding woman, consult your physician before intaking this drug. Typically, the ingredients of this drug may pass on to the infants through you. As a result, it can harm infants fatally.

However, if you take the drug as prescribed by the doctors, it is completely safe. If you want to avoid these problems as a whole, ask your physician to suggest alternate medicines.

You can also try Ayurveda or other traditional medicines, after consulting the medical experts.

Storing DayQuil

As with most drugs, store DayQuil in a dark, dry, and cool place. Avoid direct exposure to sunlight for long durations. Do not store in wet places like bathrooms. In any case, follow the instructions in the label for safe storage. You can also contact the pharmacist for clarifications.

After usage, do not flush medications in toilets unless specifically instructed. You can also make use of FDAs take-back programs. For more details, visit the official FDA website. In any case, make sure to keep all drugs including DayQuil away from the reach of children and pets.


DayQuil is a non-drowsy drug. It neither stimulates nor energizes. Hence, you can comfortably take this drug in at night and sleep well. It is also safe to use. But you have to comply with the medical advice.

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