http://www.medications.com/effect/view/31402 Is heart racing one of the side effects? I have problems with edema which are worsened by Singulair and Zyrtec. Vivid Night terrors depression, anxiety are standard also made worse. Headaches extremely high blood pressure and nausea. I have been off the Mon, 16 Jun 2008 10:44:25 -0400 http://www.medications.com/effect/view/31402?item=9214 I was in the hospital for 3 days with a rapid heartbeat (166 bpm), and a severe upper respiratory infection. I am 41 years old and I was in the cardiology unit in the hospital (the youngest patient there!) because they could not get my heart rate to come http://www.medications.com/effect/view/31402?item=9214 Tue, 17 Jun 2008 17:13:14 -0400 http://www.medications.com/effect/view/31402?item=9242 Thank You froglover1069 http://www.medications.com/effect/view/31402?item=9242 Wed, 18 Jun 2008 08:43:57 -0400 http://www.medications.com/effect/view/31402?item=9258 My daughter ended up in the ER with her heart racing and her blood pressure was elavated. I believe Singulair did it because I took her off it and she has not had any more heart racing. She also had bad nightmares, and bad headaches. http://www.medications.com/effect/view/31402?item=9258