I am currenty in hospital and having severe attacks every 4 weeks. I dont absorb prednilsone so on Dexamethason as its very stron can only be on it for a week so after a while things get worse. I am not in my specilist hospital and the hospital I'm in (my local) have surggested theophylline when I leave. I been investigating on the web this drug and notice you have to stick to the same brand. How do they decide what brand to put you on?