How Long After NyQuil Can I Take Dayquil (And Why)?

Exact Answer: Four hours

NyQuil falls under cold medicines and helps treat medical conditions such as cough and the common cold. Many other drugs are also used for these conditions, but they are not as good as NyQuil. It is one of the most commonly used syrups in the world. However, its use is prohibited for children of six years or lesser in Canada and the United States.

It is also one of the most prescribed syrups by medical experts in treating cold and cough. The medical expert only decides the exact amount of syrup to be taken and the routine to take it.

How Long After NyQuil Can I Take Dayquil

How Long After NyQuil Can I Take DayQuil?

The exact condition of the patient depends on the coughing symptoms. Severe coughing symptoms can be painful for the person. In most cases, mucus is found in parts of the airways and trachea, along with lungs and bronchi. It is crucial to remove the mucus at the earliest as it causes a lot of discomforts. Cough suppressants also work very beneficially in helping a patient recover from such conditions. However, the efficacy of this syrup is not proven ultimately, and in children, it is found to be of no use.

DayQuil is the sister syrup of NyQuil, and both of them are produced by the Vicks company. Vicks is a company of America, and it is owned by two parent companies, namely Helen of Troy Limited and Procter & Gamble. This American brand is famous for providing medicines related to medical conditions that occur regularly. Its medicines are available in all medical stores, and they can be purchased without a prescription.

Age Group Of PatientTime Gap Between NyQuil And DayQuil
MinorSix hours
AdultFour hours

It is not advised to take Nyquil and DayQuil because the composition of both the drugs taken together can be harmful to the patient. Minors should keep a time gap of a minimum of six hours between both the drugs. In contrast, adults can take one drug after the other only if the time gap is a minimum of four hours. It is always an excellent option to take advice from a medical practitioner in these conditions.

Why Does It That Long After NyQuil To Take DayQuil?

NyQuil and DayQuil have been used for a very long time and are effective in most cases. However, several natural measures can be taken to prevent the use of synthetic drugs. Honey is found to be very helpful in fighting cold and cough conditions. Patients can also take steam as it helps in clearing the airways and nostrils. It is always better to first opt for natural remedies. If they don’t prove effective, then only a patient should go for drugs like NyQuil and DayQuil.

It is advised not to consume NyQuil and DayQuil together because it can adversely affect the patient’s body. NyQuil is known to contain doxylamine, and DayQuil has some dextromethorphan present in it; if both these contents are present in the patient’s body simultaneously, then it can lead to dizziness and weakness in the body. It can also cause nausea and vomiting in some cases. In patients who are old, this combination has also caused impairment in thinking and vision. It is pivotal to consult a medical expert before making a routine of taking both drugs.


These two medicines are one of the most profitable drugs for the Vicks company. Every year millions of doses of these two medicines are sold. However, abuse of such drugs is found to be dangerous. Abuse may cause hallucinations or loss of consciousness. In rare cases, it has also lead to the death of the person.


Finally, it can be concluded that NyQuil and DayQuil are two of the leading drugs used for treating medical conditions like common cold and cough. These two medicines are available at medical counters without prescription, but their use is not allowed for children under six in Canada and the United States.

On average, a minor patient must keep a time gap of six hours between both the drugs. Adult patients can take one drug after the other in four hours. If both the drugs are consumed together, then the complications are severe and can also be fatal. It is imperative to visit a medical expert if a patient feels any discomfort.


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