Not Medical Advice: According to forums, Theraflu stays in the system for about 24 hours.
Theraflu® products can help relieve your most severe cold and flu symptoms including nasal congestion, sore throat, headache, body ache, fever, and sinus congestion. Some products will also relieve runny nose, sneezing and coughing.
Theraflu® products are available in a powder that dissolves in water, a variety of ExpressMax® syrups, as well as ExpressMax® caplets. Each form has a day or night option that can be used to treat a multitude of severe cold and flu symptoms.
Because of the overlap in symptoms, people often mix up cold and flu. Understand the differences between cold and flu by considering the facts at Theraflu.com.