angina
"For almost four years, I suffered with shortness of breath without chest pain, usually on exertion, and no cause was ever found. A recent heart cath and three stents later, I still have SOB, so my cardiologist thought it was angina and prescribed Ranexa. I took it for only three days and my SOB without exertion was terrible. So I stopped it right away. It took almost three weeks for the SOB to be tolerable again. I didn't experience any other side effects, but Ranexa failed at what it was supposed to do for me."