Theraflu is an over-the-counter medication designed to relieve symptoms of colds and flu. It typically contains a combination of ingredients such as acetaminophen for pain relief, diphenhydramine or phenylephrine to reduce nasal congestion, and guaifenesin to help loosen mucus. Available in various forms, including powders and liquid, Theraflu is taken to alleviate symptoms like fever, cough, and sore throat. It is important to follow the dosage instructions on the packaging and consult a healthcare professional if symptoms persist or worsen.