Brief Answer: Please do not take diovan till we know exact cause Detailed Answer: Dear patient. Greetings from health care magic!!! I am Dr Thakker and shall be answering your question. The drug you are referring is Diovan which belongs to Angiotensin Receptor Blocker group of medicines. It is used for control of hypertension and heart failure. I would advise against taking diovan right now as we do not know the exact cause of your breathlessness. Once this is known, I can recommend to you the correct medicines to be taken. I wish to know more details about your breathlessness. -When does it occur? -What aggravates your breathlessness? -What relieves it? -Do you have accompanying chest pain, leg swelling? -Do you have fever and cough as well? -Are you able to sleep well or you get breathless spells in sleep? -Are you having diabetes/ hypertension/ ischemic heart disease? This information will help me to narrow down to the cause whether it is respiratory or cardiac. Along with the above history, we need your ECG, X-ray chest, blood investigations like CBC, lipid profile, fasting and post lunch sugar levels, 2D echo of the heart. Please keep me updated with these reports as well. I hope this helps you out. If you have any more questions, please do not hesitate to write back to me. Yours sincerely, Dr Thakker.