hundreds of different things can cause allergic reaction (including the doxycycline) but neither has "sulfa". the prednisone can help fight an allergic reaction; an antihistamine may also help.
is sulpher in doxycycline or prednisone? . prednisone 20 mg doxycycline hyclate 100 mg. my husband took these meds they are finished now but he is haveing an alergic reaction to one of these meds reaction is a rash top of rt shoulder and both arms. what should he do?