Singulair Side Effects: Hyper, anxious, weight gain, high blood pressure: I started takin http://www.medications.com/effect/view/21038 Hyper, anxious, weight gain, high blood pressure: I started taking Singulair in January after having some kind of allergy reaction to either the cats or something else. My GP suggested that I take it every day -but I'm quitting today. I have been so hyper t Did going off the Singulair make the difference? Tue, 11 Nov 2008 14:43:50 -0500 http://www.medications.com/effect/view/21038?item=14375 Did going off the Singulair make the difference? http://www.medications.com/effect/view/21038?item=14375