Fildena 50 mg does not cause an erection on its own; sexual arousal is necessary for it to work. It is usually taken about 30 to 60 minutes before planned sexual activity with water. The effects typically last for around 4 to 6 hours, depending on the individual’s age, metabolism, and overall health. Only one dose should be taken within a 24-hour period. Common side effects include headache, flushing, dizziness, nasal congestion, indigestion, and mild visual changes. These effects are generally temporary and mild. https://www.genericday.com/fildena-50-mg.html