Hi Bala, Your dad is suffering from multiple problems of wheezing, diabetes, has had an open heart surgery recently. These indicate that his health is not in a very good condition. He should continue on Deriphyllin retard for his wheezing problem. Your dad definitely needs a major lifestyle modification done. He needs to get more active physically, do regular walking and exercises. He should watch his diet; reduce on high fat food intake. He must be in constant touch with his primary care physician. Hope this helps. Wishing your dad a healthy life.