The effects of Filitra 20 can last for up to 4 to 6 hours in some individuals. This duration allows for a sufficient window of time for sexual activity and flexibility in planning intimate encounters. Like other PDE5 inhibitors, Filitra 20 may cause side effects such as headache, flushing, nasal congestion, indigestion, and back pain in some individuals. It's essential to discuss any medical conditions, medications, or concerns with a healthcare provider before using Filitra 20 to ensure its safety and suitability for individual needs.