Deriphyllin AX Tablet SR is used in the treatment of asthma (wheezing and shortness of breath) and chronic obstructive pulmonary disorder (a lung disorder in which the flow of air to the lungs is blocked). It relaxes the muscles of the air passages and makes it easier to breathe. Deriphyllin AX Tablet SR 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 doctor know about all other medications you are taking as some may affect, or be affected by this medicine. The most common side effects are nausea, vomiting, stomach discomfort, headache, and restlessness. If you get these, don’t stop taking it but do talk to your doctor. There are other, rarer side effects which can be serious. Talk to your doctor if you're worried about them. In general, you should be trying to avoid situations that make your asthma worse (your triggers) and try not to smoke. Ask your doctor whether it’s safe to take this medicine if you're pregnant or breastfeeding. Before taking it, you should tell your doctor if you have any kidney or liver diseases so that your doctor can prescribe a suitable dose for you.