Traditionally, mullein has been used in medicine as an expectorant to address respiratory congestion. Its expectorant and anti-rheumatic properties help promote coughing to expel mucus from the lungs and throat. Additionally, it soothes and lubricates the membranes of the lungs and throat while reducing swelling, which can ease irritation. Mullein has long been employed to relieve conditions such as bronchitis, asthma, croup, whooping cough, pneumonia, and tuberculosis.