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Nyquil is a medicine that can be used for the treating cold and flu symptoms and cough. It is sold over the counter, which means it does not require a prescription by a doctor. It comes in pill or liquid form.

What is Nyquil?

Nyquil contains acetaminophen, dextromethorphan, doxylamine and pseudoephedrine.

Acetaminophen is the ingredient of this medicine that aims to relieve pain and reduce fever, which are commonly present in persons who have cold or flu.

Dextromethorphan fights coughs by suppressing the cough triggers in the brain.

Doxylamine is an antihistamine, which means it helps with symptoms like runny nose, sneezing and watery eyes.

Pseudoephedrine is a decongestant. It works by shrinking the blood vessels in the nose that are responsible for congestion (stuffy nose).

Even though it is sold over-the-counter, Nyquil should not be taken lightly because it may have serious side effects. It is recommended to consult a medical professional, especially if taking different medications or if another condition or disease is present.

Nyquil can be very dangerous and even fatal for children, just like any other cold and cough medicine.

Nyquil is contraindicated for some medications, illnesses and allergies. Persons who are allergic to any of its components or substances used for its production should not take this medicine. Nyquil comes with an extensive list of factors and conditions that may cause serious health risks in combination with the medicine.

This drug should not be combined with other cold and cough drugs or with diet pills and caffeine.

Signs of overdose

If the medicine is taken in amounts larger than recommended on the fact sheet inside the package, there is a risk of overdose. Acetaminophen overdose may cause dizziness, sweating, nausea and vomiting, stomach pain, diarrhea and weakness. These symptoms may progress into more severe stomach pain, dark colored urine, jaundice (skin and eyes turn yellowish). The most severe consequences of this overdose are seizures and coma.

Possible side effects

Emergency help is required if Nyquil causes side effects like hives, trouble breathing, tingling, swelling, especially of the face, tongue or throat. These may be signs of allergy that can be potentially life threatening.

It is recommended to stop using Nyquil if side effects include a fast or uneven heartbeat, dizziness, nervousness or anxiety, confusion and disorientation, shallow breathing, bruising, high blood pressure, gastrointestinal problems like nausea and vomiting, diarrhea, loss of appetite, sleep problems and problems with vision, poor memory or concentration, rash and ringing in the ear.

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