What oldyears63is the use of taking montak lc. what is the dosage per day. Iam 63 years old and undergone a major surgery in my lungs (COPD ) at the age of 54 years at Appallo Hyderabad. After that Iam almost normal in breathing.Now adays I feel little breathing problem some times while dooing som work. NOT ALWAYS. Iam using Derifi retard 150 twise in a day. Request your advise, can I use MONTAK LC. If so What is the dosage per day. Regrds C.VIDYADHARAN.