Nitric Oxide Erection helps relax and dilate blood vessels, which improves blood flow. However, this can lead to a significant drop in blood pressure, especially if someone is already taking medications that lower blood pressure or if they have naturally low blood pressure. A sudden or excessive reduction in blood pressure can cause dizziness, fainting, or shock in extreme cases. While nitric oxide is essential for fighting infections, in some circumstances, excessive amounts of nitric oxide can promote inflammation, potentially leading to tissue damage and contributing to conditions like chronic inflammatory diseases.