NyQuil is an over-the-counter medication commonly used to relieve symptoms of the common cold and flu. It typically contains a combination of ingredients that help reduce fever, alleviate pain, and relieve cough. NyQuil is available in liquid form and as capsules, making it easy to take. This medication is designed for nighttime use, as it often contains an antihistamine that can cause drowsiness. It is important to follow the dosage instructions on the label and consult a healthcare professional if symptoms persist or worsen. Always be cautious about combining NyQuil with other medications.