Fervex is a popular brand of cold and flu relief medication. It is a powdered drink mix that contains a combination of active ingredients such as paracetamol, phenylephrine, and vitamin C. Fervex is designed to provide temporary relief from symptoms such as fever, headache, nasal congestion, and sore throat. It is easy to prepare by dissolving the powder in hot water, making it a convenient option for those seeking relief from cold and flu symptoms.