It appears, to my horror, that theophylline is closely related to caffeine and has the same awful side effects on me... Insomnia. So a low dose of 300 mg of theophylline per day is sufficient to keep me awake the whole day! (Usually, I avoid coffee after 4-5 pm since I can't sleep well with caffeine). Plus a whole load of other side effects like heart burn, belching, diarrhea which I developed every single one of them!

I probably didn't notice it previously as I was too sick with fever for the side effects to have any effect.

Which is worse, the constricted airways or the terrible side effects?