Hi! My blood pressure went up while taking Singulair for my allergies. It was usually around 138/95. After a couple of weeks the top side went back down to 118-125, however the bottom side stayed high. What does the top and bottom side represent? Which is most dangerous or are both equally? Does anyone have any idea why the bottom side only would stay up? I have stopped the Singulair, by the way, and am going back down to normal. I am very careful about watching my bp. Practically everyone in my mother's family (including herself, and both parents and all her 5 siblings) has high bp and need to be medicated. If anyone could offer any information, I would really appreciate it! Thanks!!