DUOlin Rotacap is used for the treatment of chronic obstructive pulmonary disorder (a lung disorder in which the flow of air to the lungs is blocked). It helps in relaxing the muscles of the air passages and making it easier to breathe. It relieves coughing, wheezing and feeling short of breath. Your doctor will tell you how often you need to use your inhaler . The effect of this medicine may be noticeable after a few days but will only reach its maximum after a few weeks. This medicine must ... Duolin is a prescription drug, available for use as Inhaler ,Respules,Solution,Rotacaps. Other than this, Duolin has some other therapeutic uses, which have been discussed ahead. Duolin Inhaler is used in treatment or management of Chronic obstructive pulmonary disease. Learn more about its uses, side effects, dosage, composition, price and order it online from PharmEasy with fast delivery and extra discount. Learn how to use Duolin inhalers correctly, manage side effects, and explore alternatives for effective respiratory treatment. Tips for HFA and capsule types.