Common usage: Dry cough, chronic cough and bronchitis, weak lungs, dry skin. Description: Another variation of Liu Wei Di Huang Wan, this formula helps to improve the functioning of the lungs, producing fluids for those with chronic dry cough, chronic bronchitis, excessive thirst, and dry skin problems. It is especially good for elderly patients who have become very deficient and have dry skin, dry couh, and other symptoms of aging.