I would to hear from anyone who has been taking this drug for some time but who hasn't had the regular blood tests you are supposed to have to monitor the levels of theophylline in your body. As far as I can remember, apart from prior to taking it for the first time, at least 6 years ago, I've never had another blood test for it. I understand from the patient leaflet that too much theophylline in the body can cause anxiety (amongst other things) and as I suffer from anxiety I am wondering if anyone else thinks they may be affected this way.
Libby