Horrible experience with Diovan HCT. Hives, swelling of face, I believe it could be the HCT. I have always had allergy to sulfa. I have been on ziac with HCT I now have to take an allergy pill in order to take the ziac until something else is prescribed. Divan closed my throat made me very sick. This may be good medicine for some but for me it is on the "bad medicine" list.