<p data-pm-slice="1 1 []">Medicines used to manage erectile dysfunction can help improve blood circulation, but they may also cause some unwanted effects. Common reactions include headaches, facial flushing, dizziness, nasal congestion, and indigestion. For example, the Cenforce 100 blue pill contains sildenafil citrate, which works by relaxing blood vessels and supporting blood flow. Some users may also experience temporary vision changes or stomach discomfort. The risk of side effects can vary depending on dosage, existing health conditions, and other medicines being taken. Avoid combining sildenafil with nitrate-based medicines because this can lead to a dangerous drop in blood pressure. A healthcare professional can explain suitable treatment options and safety precautions before use.