Sydney does not cure cough. Sydney is a food, containing malic acid, citric acid, vitamin B, vitamin C and carotene, etc., which can give the body nutrients. But Sydney is not a drug, no therapeutic effect. It has some relief effect on cough, but no curative effect. Serious recurrent cough patients are recommended to consult a doctor in a timely manner to clarify the cause of the disease and then choose the appropriate medication, so as not to delay the condition.