The label from the pharmacy identified the drug prescribed by the doctor as fexofenadine HCL for hives. But when I entered the list of drugs I may have confused what's on my list. I always check Drugs com for any side effects and they just prescribed 2 doxycycline for one day so now I'm re-checking everything for interactions and am wondering if fexofenadine HCL is the same as pseudoephedrine?