With Coronary artery disease and Erectile dysfunction, treatment must be chosen carefully. Medicines like Sildenafil can be used in many patients, but are strictly unsafe if you take nitrate medicines (for chest pain), as this can cause a dangerous drop in blood pressure. First consult your cardiologist to confirm your heart condition is stable and review your current drugs; lifestyle changes (exercise, weight control, diabetes/BP control) also improve ED. Do not self-medicate-get a doctor?s approval before starting any ED medicine.