My doctor recently switched me from Lotrel to Valturna for my high blood pressure, however, it's not working for me. In fact my BP went from 138/88 to 160/100 while taking Valturna. I asked my doctor to add HCT, however, because I developed a rash from taking a sulfa antiobiotic 10 years ago, he doesn't want to take the chance. So he put me back on Lotrel along with the Valturna. He said as my BP comes down, he'll adjust the meds. My questions are: (1) I've read that having a rash deveop from a sulfa antiobiotic doesn't necessary mean I'll have an allergic reaction to HCT. Is it safe to try the diuretic to see what happens? Also, (2) Is it safe to take Valturna and Lotrel together? I know the ACE and ARB drugs are similar. Thank you for your assistance.