yeah, it's an antihistamine..........ur stomach is producing too much histamine in an attempt to get ur stomach to produce more hydrochloric acid (HCl)..........it will do the same with gastrin, too........that will make u throw up & bloat badly, if it's being over produced..........the stomach like a very low Ph, hence trying to get more HCl produced..........HCl is so important.........it keeps ur stomach sterile by killing germs & bacteria, b 4 it can get into ur body.......it stops the gastrin & histamine from being over produced (histamine causes allergic reactions & not just with sinus problems).........it helps to completely breakdown ur food, so it is in a form that ur intestines can draw off the nutrients from the chime, otherwise they r too big & get dumped in the toilet.......it oxygenates ur blood........it keeps the waste acids/toxins from over loading ur tissues, joints & blood..........it maintains proper Ph in ur body (check out how many places on the net u can buy this or that to alkalinize ur body?)..........it stops candida getting a foothold in ur system............it keeps things running the way our bodies were designed..........so taking an antihistamine can help u, but it won't do a think for the actual problem.........not enough acid production........