Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor. It works by increasing blood flow to the penis during sexual arousal, helping to achieve and maintain an erection.Onset Time: Typically begins to work within 30-60 minutes of ingestion.Duration: The effects can last for about 4-6 hours, allowing for multiple attempts at sexual activity during this period. https://www.genericday.com/vigora-oral-jelly.html