I've been suffering with chronic idiopathic urticaria & angioedema for 6 months now. i still need 1/2 a tablet of 25 mg every 48 hrs. want to cure it.

Urticaria/angioedema: the chronic idiopathic type (if no cause is found) can last much longer, and resolves on its own, and nobody can predict when exactly will it resolve, most important is symptom control. You mentioned half a tablet of the 25 mg every 48 hours!! of which drug? if it is an antihistaminic of any kind,that's a minimal dose and probably you won't need more,if it is a steroid, better taper it, C ur MD