Ventavis® may cause dizziness, lightheadedness and fainting. Most common side effects are flushing, increased cough, low blood pressure, headache, nausea, spasm of the jaw muscles that causes trouble opening your mouth, and fainting. Other serious adverse events reported with the use of Ventavis include congestive heart failure, chest pain, supraventricular tachycardia, dyspnea, peripheral edema, and kidney failure.