How Long Does Dayquil Last: All Information About


How Long Does Dayquil Last If you want an all-in-one for cold symptoms and flu that won’t put you to sleep either? How Long Does Dayquil Last DayQuil Cold & Flu can do the job? Learn how it works and what forms it occurs, the dosages for each, and what to watch for before and while taking it. How Long Does Dayquil Last And when should it be used? What are the dangers? We answer all these questions in this article.

How does it work?

Paracetamol is an antipyretic and pain reliever. It changes the way your body perceives pain. It also changes the way your body regulates its temperature. Dextromethorphan suppresses your urge to cough. The third ingredient, phenylephrine, is a nasal decongestant; it reduces the swelling of the blood vessels in your nasal passages.



About DayQuil

DayQuil Cold & Flu is a combination product that contains the active ingredients paracetamol, dextromethorphan and phenylephrine. It temporarily treats symptoms of the common cold and flu. These symptoms include:

  • Fever
  • To cough
  • Stuffy nose
  • light pain
  • A headache
  • Sore throat

DayQuil is intended for use during the day. Unlike NyQuil, it doesn’t contain the active ingredient doxylamine, an antihistamine that can make you sleepy.


What are the forms and dosages?

DayQuil comes in liquid-filled capsules called LiquiCaps. It also comes as a liquid that you drink. The table below shows the recommended dosage for each form by age group. Ask your doctor about the correct dosage for children aged 4 to 5 years, and do not give DayQuil to children younger than four.

Side effects

DayQuil can cause some undesirable side effects. Most of these side effects do not require medical attention. Instead, they can go away as your body gets used to the drug. You can ask your doctor about minor side effects that are annoying or won’t go away.

More common side effects

The most common side effects can be:

  • Drowsiness
  • Sleepiness
  • Stomach pain
  • Nausea
  • Vomit
  • Nervousness
  • Dizziness
  • Sleep disorders

Also, avoid drinking grapefruit juice while taking this medication. Grapefruit juice can increase levels of dextromethorphan, one of the ingredients in DayQuil. Higher levels increase the risk of side effects such as nervousness and dizziness.

Serious side effects
A severe side effect of DayQuil is an allergic reaction. Symptoms include:

  • Skin rash
  • Beehives
  • Itching
  • Red, peeling, or blistered skin
  • Itching
  • Difficulty breathing
  • Problems swallowing
  • Swelling of the face, throat, tongue, or lips
  • Swelling of your hands, legs, ankles, or feet

Contact your doctor or get emergency medical help right away if you have any of these symptoms while taking DayQuil.

Drugs That Interact With DayQuil

The active ingredients in DayQuil can interact with other medicines. These interactions can affect the way the drugs work or increase the risk of harmful side effects. If you are using any of the medications listed below or any other medications, supplements, or herbs, consult your doctor before using DayQuil.

The acetaminophen in DayQuil may interact with the following drugs:

  • Carbamazepine
  • Isoniazid
  • Phenobarbital
  • Phenytoin
  • Phenothiazines
  • Warfarin

The phenylephrine and dextromethorphan can interact with drugs called monoamine oxidase inhibitor MAOIs. Even if you’ve stopped taking MAOIs, interactions may occur if you’ve used them within the last two weeks. Examples of these drugs are:

  • Isocarboxazid
  • Phenelzine
  • Selegiline
  • Tranylcypromine

Also, do not use if you drink more than three alcoholic beverages per day. This combination can cause severe liver damage.


In general, DayQuil is a safe drug. However, if you suffer from certain medical conditions, use too much of it, or abuse it, it can have harmful effects.

Use for certain diseases.

DayQuil can make some conditions worse. Talk to your doctor before using DayQuil if you have any of the following conditions:

  • Heart disease
  • High blood pressure
  • Diabetes
  • Liver disease
  • Thyroid disease
  • An enlarged prostate makes it difficult to urinate


Taking too much can cause significant liver damage from too much paracetamol. Make sure none of the other medications you are taking also contain paracetamol. Even if you’re taking it as recommended, taking it with other drugs that have paracetamol may result in an overdose.

If you accidentally ingest too much, call your local poison control centre, even if you don’t notice any severe signs or symptoms. If someone you know has taken too much DayQuil or acetaminophen and passed out, call 911.


DayQuil can be abused. Do not treat productive coughs or chronic coughs from smoking, asthma, chronic bronchitis, or emphysema. Instead, ask your doctor how you can relieve this type of cough.

The ingredient dextromethorphan in DayQuil is a commonly abused drug. In high doses, it causes increased feelings and even hallucinations. This dangerous abuse is known as “robo-tripping” or “bowling” and can potentially lead to death. Only take in a safe dose.

Pregnancy and breastfeeding period

Let your doctor know if you are pregnant, planning to become pregnant, or breastfeeding before taking. Your doctor may suggest other ways to manage your cold and flu symptoms.

Talk to your doctor

DayQuil treats many symptoms of the common cold and flu. The three active ingredients work in different ways to make you feel better. These ingredients can cause side effects, interact with other drugs, or affect certain medical conditions.

Follow the information here to use it safely. When in doubt, always consult your doctor before taking any medication.


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