Is There A Alternate For Tedral Sa Tablet?

Sir im 29 yrs I have a asthma problem. From last 7 to 8 year im taking Tedral sa tables. But now last 2 to 3 mths im unable to find out this medicine. It gives me relief for 24 hours. I have consult with my family doctor but no use he had give many other medicines like derfyline . Ashaline pls suggest me what should I do. If u can suggest an medicine same like tedral sa I ll be very useful for me.