I am 57 years old, male and Asthmatic since birth. I was using Asthalin before for a long time, but stopped because I started getting tremors. Now I am on Doxophylline 400 mg 1-0-1, and also using Asthalin and Budecort inhalers. During my previous questions and answers I got I gathered that a long acting beta 2-agonist inhaler is useful and better than Asthalin inhaler. I am not getting relief from tablets. But there was a time when my physician suggested a beta 2-agonist tablet viz Bambuterol 10 mg (Betaday), but it is not available now. Can I switch over to Theo-asthalin 1-0-1 or Deriphyllin Retard 300 mg 1-0-1 on a regular basis or stay put with Doxophylline 400 mg 1-0-1? If this decision is not feasible, suggest a long acting beta 2-agonist tablet. Please advice.