Doenac A 100mg/600mg Tablet is used to treat and prevent asthma and symptoms of chronic obstructive pulmonary disorder (a lung disorder in which the flow of air to the lungs is blocked) such as coughing, wheezing, and shortness of breath. It helps relax the muscles of the air passages thereby making it easier to breathe. Doenac A 100mg/600mg Tablet is taken with or without food in a dose and duration as advised by the doctor. The dose you are given will depend on your condition and how you respond to the medicine. You should keep taking this medicine for as long as your doctor recommends. If you stop treatment too early your symptoms may come back and your condition may worsen. Let your healthcare team know about all other medications you are taking as some may affect, or be affected by this medicine. The most common side effects are vomiting, heartburn, stomach upset, rash, itching, breathing difficulty, and nasal inflammation. Most of these are temporary and usually resolve with time. Contact your doctor straight away if you are at all concerned about any of these side effects. Avoid drinking alcohol while taking this medicine as that may cause excessive drowsiness. Never support self-medication or recommend your medicine to another person. Before you start taking this medicine it is important to inform your doctor if you are suffering from liver or kidney disease. You should also tell your doctor if you are pregnant, planning pregnancy, or breastfeeding.